Carrier 39L User Manual

39L,NX  
Central Station Air-Handling Units  
With Product Integrated Controls (PIC)  
Installation, Operation, and  
Start-Up Instructions  
CONTENTS  
• DEVICE UNDER DISCRETE OUTPUT  
Page  
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2  
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2  
TEMPERATURE CONTROL  
• DISCRETE OUTPUT DEVICE UNDER  
TIMECLOCK CONTROL  
• HUMIDIFICATION DEVICES  
• AIR QUALITY SENSOR  
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64  
Service Area Requirements . . . . . . . . . . . . . . . . . . . 2  
Remote Control Box Option . . . . . . . . . . . . . . . . . . 2  
• REMOTE CONTROL BOX CONDENSATE  
PREVENTION  
Make Electrical Connections . . . . . . . . . . . . . . . . . . 3  
Variable Frequency Drives . . . . . . . . . . . . . . . . . . . 38  
Water Valve Assemblies . . . . . . . . . . . . . . . . . . . . . 38  
VALVE WIRING  
Duct Static Pressure Probe (VAV Units) . . . . . . 39  
Space Temperature Sensor . . . . . . . . . . . . . . . . . . 40  
Outdoor-Air Temperature Sensor . . . . . . . . . . . . . 42  
Mixed-Air Temperature Sensor . . . . . . . . . . . . . . . 42  
Enthalpy Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43  
• CONTROL RANGES  
Supply-Air Temperature Sensor . . . . . . . . . . . . . . 44  
Return-Air Temperature Sensor . . . . . . . . . . . . . . 44  
Heat Interlock Relay . . . . . . . . . . . . . . . . . . . . . . . . . 45  
Fan Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45  
Duct High Humidity Switch . . . . . . . . . . . . . . . . . . 45  
Wall-Mounted Relative Humidity Sensor . . . . . . 46  
Duct-Mounted Relative Humidity Sensor . . . . . . 47  
• LOCATION FOR OUTSIDE AIR RELATIVE  
HUMIDITY  
• OUTSIDE AIR VELOCITY PRESSURE (OAVP)  
SENSOR  
• FAN VOLUME CONTROL  
• ELECTRIC HEATER  
• CARRIER COMFORT NETWORK INTERFACE  
• OUTDOOR-AIR THERMOSTAT  
CONTROL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . 64-68  
Processor (PSIO Master) and Option (PSIO Slave)  
Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65  
Relay (DSIO) Module . . . . . . . . . . . . . . . . . . . . . . . 65  
Local Interface Device (HSIO) . . . . . . . . . . . . . . . 67  
CONTROL OPERATION . . . . . . . . . . . . . . . . . . . 69-91  
Accessing Functions and Subfunctions . . . . . 69  
Display Functions . . . . . . . . . . . . . . . . . . . . . . . . . . 69  
• SUMMARY DISPLAY  
• STATUS FUNCTION  
• HISTORY FUNCTION  
• TEST FUNCTION  
Programming Functions . . . . . . . . . . . . . . . . . . . 81  
• SERVICE FUNCTION  
• SET POINT FUNCTION  
• SCHEDULE FUNCTION  
• LOCATION FOR RETURN AIR RELATIVE  
HUMIDITY  
CONTROL OPERATING SEQUENCE . . . . . . . 92-102  
Constant Volume and Variable Air  
Volume Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92  
Constant Volume Units Only . . . . . . . . . . . . . . . . 96  
Variable Air Volume Units Only . . . . . . . . . . . . . 99  
Mixing Box Linkage . . . . . . . . . . . . . . . . . . . . . . . . . 47  
Airflow Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48  
Low-Temperature Thermostat . . . . . . . . . . . . . . . . 48  
Outdoor-Air Thermostat . . . . . . . . . . . . . . . . . . . . . 48  
Filter Status Switch . . . . . . . . . . . . . . . . . . . . . . . . . 49  
High-Pressure Switch . . . . . . . . . . . . . . . . . . . . . . . 49  
Air Quality Sensors . . . . . . . . . . . . . . . . . . . . . . . . . 49  
Constant Outside Air (OAC) Control . . . . . . . . . . 50  
• PROBE INSTALLATION  
START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103-108  
Initial Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103  
Quick Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103  
Electronic Valve Actuator Field Test . . . . . . . . 108  
CONTROL LOOP CHECKOUT . . . . . . . . . . . . 108,109  
To Check Operation of Analog Outputs . . . . . 108  
• OAC CALIBRATION  
• USING OAVP VALUES TO DETERMINE DUCT  
AIRFLOW  
VALVE TROUBLESHOOTING . . . . . . . . . . . . . 109-111  
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109  
• FIELD-SUPPLIED OR HIGH-VELOCITY  
PRESSURE TRANSDUCERS  
All ⁄2-in. Through 114-in. Electric Hot Water/Steam  
1
Field Wiring Connections . . . . . . . . . . . . . . . . . . . . 52  
• REMOTE LOCAL INTERFACE DEVICE (HSIO)  
• RETURN-AIR TEMPERATURE SENSOR,  
OUTDOOR-AIR TEMPERATURE SENSOR,  
ENTHALPY SWITCH, AND MIXED-AIR  
TEMPERATURE SENSOR  
Valve Assemblies . . . . . . . . . . . . . . . . . . . . . . . 109  
All 112-in. Through 3-in. Valve Assemblies . . 110  
CONTROL MODULE  
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 111,112  
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111  
Module Replacement (PSIO, DSIO) . . . . . . . . . 112  
• SPACE TEMPERATURE SENSOR (SPT)  
• DAMPER ACTUATORS  
• SMOKE CONTROL OPTION  
• ANALOG DEVICE FOR ANALOG OUTPUT  
TEMPERATURE CONTROL  
UNIT TROUBLESHOOTING . . . . . . . . . . . . . . . 113-115  
METRIC CONVERSION CHART . . . . . . . . . . . . . 116  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 3  
PC 201  
Catalog No. 533-913  
Printed in U.S.A.  
Form 39L,NX-2SI  
Pg 1  
3-96  
Replaces: 39L,NX-1SI  
Tab 1b  
Mount the remote control box as follows:  
1. Loosen and remove the 4 nuts securing the control panel  
in the control box.  
2. Remove the control panel from the box; set the panel and  
nuts aside for reassembly later.  
IMPORTANT: To ease installation, control wiring is  
located on the service side of the unit with electrical  
connectors provided at all unit separation points. If a  
unit is separated into pieces for installation, rejoin all  
connectors in their original alpha-numeric sequence upon  
reassembly. Connectors for vertical fan sections that  
are shipped out of the normal operating position must  
also be joined at final assembly.  
3. Mount the control box to the Unistrutsupport using field-  
supplied fasteners.  
4. Locate, mark, and drill pilot holes on the top of the box  
for each of the following:  
For units with an integral PIC section, all unit factory con-  
trol wiring is internal. Only a small number of wires must be  
field-installed. All internal wiring consists of plenum wires  
which enter the rear of the control box through sealed fit-  
tings. Control wiring is 18 to 20 gage, 2-conductor twisted  
pair.  
Motor starter wiring  
Actuator and sensor wires to fan section junction box  
Supply power wires (ac)  
Valve wiring or tubing (water valves, field-supplied  
sensors, or other devices)  
The electrical power disconnect and fan motor starter are  
field-supplied and installed. Connections are provided in the  
control box to wire a field-supplied HOA (HANDS/OFF/  
AUTOMATIC) switch. If an HOA switch is used, it must be  
field-installed in the supply and return fan motor starter cir-  
cuit. The factory-wired high-pressure switch (variable air vol-  
ume only) and low-temperature thermostat options are en-  
ergized when the supply fan circuit is powered.  
See Fig. 5-7 for control box component arrangements and  
Fig. 8 for fan motor wiring. PIC input and output points are  
listed in Table 1. Consult the wiring diagram located in the  
control box or Fig. 9-12 for further details.  
5. Expand the pilot holes as required. Recommended sizes  
are as follows:  
3
Motor starter wiring — 4 in. (5 wires)  
Actuator and sensor wires to fan section junction  
3
box — 4 in. to 1 in. (number of wires and hole di-  
ameter determined by application)  
1
3
Supply power wires (ac) — 2 in. or 4 in.  
Valve wiring or tubing — size as required  
Fan section panels are provided with pilot holes that can  
be drilled or punched to accomodate an electrical conduit  
for the remote control box wiring. Where possible, install  
the conduit in a panel that will not be removed, such as the  
discharge panel. See Fig. 4.  
Power is present in the PIC control box in the motor  
starter circuit even when the dedicated power to the PIC  
control box is off.  
REMOTE CONTROL BOX CONDENSATE PREVEN-  
TION — When the remote control box is installed, precau-  
tions must be taken to prevent condensation from forming  
inside the junction box mounted in the unit’s supply fan sec-  
tion. Standard installation practice is to mount the remote  
control box adjacent to the air handling unit and then to en-  
close the Class II wiring in flexible conduit between the con-  
trol box and the junction box in the fan section.  
The sheet metal housing of the control box is not airtight,  
therefore warm, moist air can migrate through the flexible  
conduit to the junction box in the fan section. Condensate  
can form inside the junction box and possibly on the termi-  
nal lugs.  
To prevent moist air from migrating through the conduit,  
seal the control wires inside the conduit at the remote con-  
trol box enclosure. See Fig. 4. Use a nonconductive, non-  
hardening sealant. Permagum (manufactured by Schnee  
Morehead) or sealing compound, thumb grade (manufac-  
tured by Calgon), are acceptable materials.  
The supply and return fan starter circuits are independent  
from each other. Either circuit and its related control box  
interface can have 24 vac, 120 vac, or 240 vac power.  
All options that require a factory-installed transformer  
are fused with 3.2 amp fuses on the secondary of each  
transformer.  
When the control box is shipped separately for remote mount-  
ing, all unit wiring terminates in a junction box located in  
the fan section. Refer to Fig. 12 for the applicable wiring  
diagram and Table 2 for junction box connections.  
If the unit is provided with a factory-installed smoke con-  
trol option, refer to the section titled Field-Wiring Connec-  
tions, Smoke Control Option, page 54.  
All PIC electrical components are UL (UnderwritersLabo-  
ratories) listed. The electronic modules are approved under  
UL HVAC Equipment Standard 873. PIC units are listed and  
labeled by ETL (Engineering Testing Laboratory) to comply  
with UL Standard 1995 for heating and cooling units, and  
comply with NFPA (National Fire Protection Association)  
Standard 90A.  
Make Electrical Connections — 39L and 39NX units  
have internal control wiring for the operation of the PIC sec-  
tion and its control devices. The control system requires a  
dedicated 120 vac or 230 vac (50 or 60 Hz) power circuit  
capable of providing a minimum of 10 amps (but not greater  
than 20 amps) to the control box. The actual number of con-  
trols on one power source depends on the installation and  
power circuit requirements. Do not run PIC power wiring in  
the same conduit as sensor wiring or control wiring of field-  
installed devices.  
3
LEGEND  
ABX  
AF  
Air Blender  
Airfoil  
CV  
Constant Volume  
Inlet Guide Vanes  
Forward-Curved  
Filter Mixing Box  
Mixing Box  
Product Integrated Controls  
Variable Air Volume  
IGV  
FC  
FMB  
MXB  
PIC  
VAV  
*The cv capacity rating is the flow (gpm) through a valve at 1 psi pres-  
sure drop.  
Fig. 1 — Basic PIC Order Number  
4
LEGEND  
AF  
Airfoil  
CV  
Constant Volume  
Direct Expansion  
Forward-Curved  
Filter Mixing Box  
Mixing Box  
DX  
FC  
FMB  
MXB  
N.C.  
N.O.  
PIC  
VAV  
Normally Closed  
Normally Open  
Product Integrated Controls  
Variable Air Volume  
*The cv capacity rating is the flow (gpm) through a  
valve at 1 psi pressure drop.  
Fig. 2 — PIC Option Order Number  
5
NOTE: Dimensions in [ ] are in millimeters.  
Fig. 3 — Control Box for Remote Mounting  
Fig. 4 — Sealing Control Wiring in Flexible Conduit  
6
LEGEND (Fig. 5-12, Table 2)  
AFS  
AO  
AOTC  
AQ1  
AQ2  
C
CCW  
CH  
CR  
CUST  
CV  
CW  
CWV  
DHH  
DO  
DOTC  
DSIO  
DTCC  
DX  
DXS  
DXSD  
EHS  
ELEC  
ENT  
EQUIP  
EVAC  
EXD  
FLTS  
FSD  
FU  
Airflow Switch  
OT  
Outside-Air Thermostat  
Preheat  
Analog Output  
PH  
Analog Output Temperature Control  
Air Quality Sensor, No. 1  
Air Quality Sensor, No. 2  
Contactor  
PL  
Plug Assembly  
PRESS  
PSIO  
PURG  
RAD  
RAT  
RFAN  
RFR  
RFVC  
RH  
Smoke Pressurization Input  
Processor Module  
Smoke Purge Input  
Return-Air Damper Actuator  
Return-Air Temperature  
Return Fan  
Return Fan Relay  
Return Fan Volume Control  
Relative Humidity  
Return Velocity Pressure  
Supply-Air Temperature  
Fan Status Relay  
Supply Fan  
Counterclockwise  
Channel  
Control Relay  
Condensing Unit Status  
Constant Volume  
Clockwise  
Chilled Water Valve  
Duct High Humidity  
Discrete Output  
RVP  
SAT  
SF  
Discrete Output Temperature Control  
Control Module, Electric Heat and/or DX  
Discrete Time Clock Control  
Direct Expansion  
SFAN  
SFR  
SMK  
SNB  
SP  
Supply Fan Relay  
Smoke  
Snubber  
DX Cooling Stage  
Static Pressure Transducer  
Slave Processor Module  
(Option Module)  
Space Temperature  
Supply Velocity Pressure  
Switch  
Direct Expansion Cooling Shutdown  
Electric Heaters  
SPSIO  
Electric  
SPT  
SVP  
SW  
Enthalpy Switch  
Equipment  
Smoke Evacuation Input  
Exhaust Air Damper Actuator  
Filter Status Switch  
Fire Shutdown Device  
Fuse  
TB  
Terminal Block Terminal  
Temperature  
TEMP  
TRAN  
VAV  
W/  
Transformer  
Variable Air Volume  
With  
GND  
HIR  
HOA  
HPS  
HSIO  
HT  
Ground  
WO/  
Without  
Heat Interlock Relay  
Hand-Off-Auto. Switch  
High-Pressure Switch  
Keyboard and Display Module  
Heat  
Marked Wire or Cable  
Terminal (Marked)  
Terminal (Unmarked)  
HUM  
HWV  
IGV  
Humidifier  
Hot Water Valve  
Terminal Block  
Splice (Factory)  
Inlet Guide Vane Actuator  
Low Temperature Thermostat  
Mixed-Air Damper Actuator  
Mixed-Air Temperature  
Master Processor Module  
(Processor Module)  
Outdoor-Air Damper Actuator  
Outdoor-Air Relative Humidity  
Outdoor-Air Temperature  
Outdoor-Air Velocity Pressure  
LTT  
MAD  
MAT  
MPSIO  
Splice (Field)  
Wiring Factory  
Wiring Field Control  
Wiring Field Power  
Option or Accessory  
Common Potential  
OAD  
OARH  
OAT  
OAVP  
NOTES:  
1. Use copper conductors only.  
2. Wire is in accordance with National Electrical Code (NEC). For local codes,  
replace original wires with 90 C wire or its equivalent.  
3. Replace wires from IGV, FLTS, MAT, SAT, OAD, RAD, and ELEC HT with  
125 C plenum cable conductor as required.  
4. Input channel numbers and points for configuration of the optional  
analog output temperature control (AOTC) follow:  
CHANNEL  
SENSOR  
SAT  
DESCRIPTION  
Supply-Air Temperature  
Outdoor-Air Temperature  
Mixed-Air Temperature  
1
2
OAT  
3
MAT  
6
SPT  
Space-Air Temperature  
7
RAT  
Return-Air Temperature  
Preheat or Optional Carrier Sensor  
34  
TEMP  
5. Reference for wire markers, where ‘X’ represents a numeral:  
X
— Item number on wiring harness  
BX — Box wire  
CX — Cable  
KX — Accessory kit wire  
7
ARRANGEMENT FOR SIZES 03 AND 06  
ARRANGEMENT FOR SIZES 08 THROUGH 35  
Fig. 5 — PIC Section Control Box Component Arrangements, 39L  
8
Fig. 6 — PIC Section Control Box Component Arrangement, 39NX Sizes 07-21  
9
Fig. 7 — PIC Section Control Box Component Arrangement, 39NX Sizes 26-92  
10  
Fig. 8 — Fan Motor Starter Circuit and PIC Control Wiring Interface — PIC Power for  
Control Circuit From Dedicated Source  
11  
Table 1 — Input and Output Points  
MODULE,  
DEFAULT ADDRESS  
INPUT  
TYPE  
CHANNEL  
NUMBER  
OUTPUT  
TYPE  
CHANNEL  
NUMBER  
INPUT  
OUTPUT  
SAT  
OAT  
MAT  
RH  
AI  
AI  
AI  
AI  
DI  
AI  
AI  
AI  
DI  
DI  
AI  
DI  
AI  
AI  
DI  
AI  
DI  
DI  
DI  
DI  
AI  
AI  
AI  
DI  
DI  
DI  
DI  
DI  
1
2
IGV*  
MIXD  
HWC  
CWC  
SF  
AO  
AO, DO†  
AO  
AO  
DO  
DO  
13  
14  
15  
16  
17  
18  
43  
44  
45  
46  
47  
48  
23  
24  
25  
26  
27  
28  
29  
30  
23  
24  
25  
26  
27  
28  
29  
30  
53  
54  
55  
56  
57  
58  
59  
60  
3
4
LTT  
SPT  
RAT  
SP*  
AFS  
FLTS  
OARH  
ENT  
SVP*  
RVP*  
DHH  
TEMP  
PRES  
EVAC  
PURG  
FSD  
AQ1  
AQ2  
OAVP*  
METER  
5
6
HIR*  
PSIO (Processor)  
ADDRESS 1  
7
8
9
10  
11  
12  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
19  
20  
49  
50  
RFVC*  
HUM1  
HUM2  
AOTC  
DOTC  
DTCC  
AO  
AO, DO  
DO  
AO  
DO  
DO  
PSIO (Option)  
ADDRESS 31  
EHS1  
EHS2  
EHS3  
EHS4  
EHS5  
EHS6  
EHS7  
EHS8  
DXS1  
DXS2  
DXS3  
DXS4  
DXS5  
DXS6  
DXS7  
DXS8  
DXS1  
DXS2  
DXS3  
DXS4  
DXS5  
DXS6  
DXS7  
DXS8  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DO  
DSIO (Electric Heat)  
ADDRESS 19  
CUST  
DXSD  
DSIO (DX without  
Electric Heat)  
ADDRESS 19  
CUST  
DXSD  
DSIO (DX with  
Electric Heat)  
ADDRESS 49  
LEGEND  
AFS  
Airflow Switch (Supply Fan  
DXS1-8  
Direct Expansion Cooling  
Stages 1-8  
MIXD  
OARH  
OAT  
OAVP  
PRES  
PURG  
RAT  
Mixed-Air Dampers  
Outdoor-Air Relative Humidity  
Outdoor-Air Temperature  
Outdoor-Air Velocity Pressure  
Pressurization  
Status Switch)  
AI  
Analog Input  
Analog Output  
Analog Output Temperature  
Control  
DXSD  
Direct Expansion Cooling  
Shutdown  
AO  
AOTC  
EHS1-8  
ENT  
Electric Heater Stages 1-8  
Enthalpy Switch  
Purge  
Return-Air Temperature  
Return Fan Volume Control  
Relative Humidity  
AQ1, 2  
CUST  
Air Quality Sensors 1, 2  
Condensing Unit Status  
(Outdoor Air Thermostat)  
Chilled Water Coil  
Discrete Input  
EVAC  
FLTS  
FSD  
Evacuation  
RFVC  
RH  
Filter Status Switch  
Fire Shutdown  
RVP  
SAT  
Return Velocity Pressure  
Supply-Air Temperature  
Supply Fan Relay  
HIR  
Heat Interlock Relay  
Hot Water Coil  
CWC  
DI  
HWC  
HUM1, 2  
IGV  
SF  
Humidity Stages 1, 2  
Inlet Guide Vanes  
Low Temperature Thermostat  
(also labelled FRZ)  
Mixed-Air Temperature  
Meter (Pulsed Dry-Contact  
Input)  
DHH  
DO  
Duct High Humidity  
Discrete Output  
SP  
Static Pressure  
SPT  
Space Temperature  
LTT  
DOTC  
Discrete Output Temperature  
Control  
SVP  
Supply Velocity Pressure  
Optional Temperature Input  
TEMP  
MAT  
METER  
DTCC  
Discrete Output Timeclock  
Control  
*Available on VAV only.  
†Discrete output with two-position damper control.  
12  
13  
14  
15  
Fig. 9 — Unit Wiring Schematic, 39L Sizes 03-35 (115 v, Typical) (cont)  
16  
Fig. 9 — Unit Wiring Schematic, 39L Sizes 03-35 (115 v, Typical) (cont)  
17  
Fig. 9 — Unit Wiring Schematic, 39L Sizes 03-35 (115 v, Typical) (cont)  
18  
19  
20  
21  
Fig. 10 — Unit Wiring Schematic, 39NX Sizes 07-21 (115 v, Typical) (cont)  
22  
Fig. 10 — Unit Wiring Schematic, 39NX Sizes 07-21 (115 v, Typical) (cont)  
23  
Fig. 10 — Unit Wiring Schematic, 39NX Sizes 07-21 (115 v, Typical) (cont)  
24  
25  
26  
27  
Fig. 11 — Unit Wiring Schematic, 39NX Sizes 26-92 (115 v, Typical) (cont)  
28  
Fig. 11 — Unit Wiring Schematic, 39NX Sizes 26-92 (115 v, Typical) (cont)  
29  
Fig. 11 — Unit Wiring Schematic, 39NX Sizes 26-92 (115 v, Typical) (cont)  
30  
31  
32  
33  
Fig. 12 — Unit Wiring Schematic, 39L and 39NX PIC with Remote Control Box (cont)  
34  
Fig. 12 — Unit Wiring Schematic, 39L and 39NX PIC with Remote Control Box (cont)  
35  
Fig. 12 — Unit Wiring Schematic, 39L and 39NX PIC with Remote Control Box (cont)  
36  
Table 2 — Junction Box Connections for Optional Remote Control Box  
REMOTE  
CONTROL BOX  
LOCATION  
CONTROL  
BOX  
TERMINAL  
FAN SECTION  
JUNCTION BOX  
SIGNAL  
JUNCTION  
BOX  
TERMINAL  
MPSIO  
MPSIO  
MPSIO  
MPSIO  
TB3  
2
3
SAT — BLK  
1
2
SAT — RED  
MAT — BLK  
MAT — RED  
FLTS — BLK  
FLTS — RED  
LTT — K3  
8
3
9
4
10  
28  
10  
13  
19  
20  
6
5
MPSIO  
TB3  
6
7
MPSIO  
TB2  
LTT — K1  
8
OAD — BLK  
OAD — WHT  
OAD — GRN  
OAD — RED  
RAD — BLK  
RAD — WHT  
RAD — GRN  
RAD — RED  
EXD — BLK  
EXD — WHT  
EXD — GRN  
EXD — RED  
SFAN1 — BLK  
SFAN1 — WHT  
SFAN1 — GRN  
SFAN1 — RED  
SFAN2 — BLK  
SFAN2 — WHT  
RFAN1 — BLK  
RFAN1 — WHT  
RFAN1 — GRN  
RFAN1 — RED  
RFAN2 — BLK  
RFAN2 — WHT  
PH — BLK  
9
TB2  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
TB2  
MPSIO  
TB2  
40  
21  
22  
7
TB2  
TB2  
TB2  
6
TB2  
27  
28  
8
TB2  
TB2  
TB2  
7
TB2  
15  
16  
38  
37  
17  
18  
23  
24  
38  
37  
25  
26  
12  
11  
TB2  
MPSIO  
MPSIO  
TB2  
TB2  
TB2  
TB2  
SPSIO  
SPSIO  
TB2  
TB2  
SPSIO  
SPSIO  
PH — RED  
NOTES:  
1. Pneumatic tubing to connect the airflow sensor in the fan to the remote control box is bundled with the internal PIC wiring to the junction box,  
but does not enter the box. Route tube directly to remote control box along with conduit containing wiring from junction box to remote control box.  
2. See Legend on page 7.  
37  
Variable-Frequency Drives — The input signal for  
the inverter must be 4 to 20 mA. Use a 2-conductor  
20 AWG (American Wire Gage) cable (single twisted pair,  
unshielded) to connect the input of the inverter to the output  
of the PIC control terminals. See Fig. 8.  
VALVE ACTUATOR  
Wire the inverter so that if it is placed in the manual or  
bypass mode the low temperature thermostat and the high-  
pressure switch (if supplied) are still in the motor control  
circuit to protect the unit.  
Adjust the minimum inverter speed to provide at least 10%  
airflow when inlet guide vanes are at 0% (4 mA) and maxi-  
mum design airflow when inlet guide vanes are at 100%  
(20 mA). Use the local interface device to verify that the  
ACTUATOR LINKAGE  
supply fan status (  
) shows the fan is ON and that the  
supply fan is operating at the lowest airflow adjustment. In-  
crease inverter minimum speed as required. For additional  
information, see the Quick Test section on page 103.  
Water Valve Assemblies — Water valve assemblies  
(Fig. 13) are shipped inside the fan section for field instal-  
lation. All valve assemblies have electrically powered ac-  
tuators. Each actuator has an external junction box for field  
wiring. The junction box contains 24 vac power wires (WHITE/  
BLUE, BLACK) and 4 to 20 mA signal wires (ϩRED,  
−GREEN). The actuators operate the valve through a linear  
stroke; if power is lost, a return spring reverses the stroke  
and returns the valve stem to the normal position.  
VALVE BODY  
Fig. 13 — Valve Assembly (Typical)  
To prevent electric shock and equipment damage, dis-  
connect the power to the control box before installing  
valve assemblies. Turn power switch located on control  
box door to OFF.  
On installations where valve mounting space is limited,  
use unions to couple valve assemblies to water lines. If unions  
do not provide sufficient clearance, refer to the Valve  
Troubleshooting section, page 109.  
On chilled water applications or hot water applications with  
112 to 3-in. valves, the valve actuators can be mounted in  
any position above the centerline of the valve body. For steam  
applications or hot water applications with 12 to 114-in. valves  
that have actuators and high-temperature linkage exten-  
sions, mount the actuator above the centerline of the valve  
body and 45 degrees from vertical. This position helps to  
prevent actuator exposure to direct heat convection.  
DO NOT install valve assembly where excessive mois-  
ture, corrosive fumes, and/or vibration are present.  
INSTALL all 2-way valve assemblies so that they close  
against system flow. An arrow on the valve body indi-  
cates the proper flow direction.  
Fig. 14 — Three-Way Mixing Valve — Normal Flow,  
Typical Piping  
ALWAYS install 3-way mixing valve with 2 inlet flows  
and one outlet. Normal flow will be from port B to port  
AB with stem up. See Fig. 14.  
38  
VALVE WIRING  
2. Using twist-on wire connectors, connect the RED (ϩ) and  
GREEN (−) leads inside the actuator junction box to the  
other 2 wires in the cable. Note the polarity of each wire.  
3. Connect the positive signal wire (connected to the RED  
lead) to pin 46 on the processor module. Connect the nega-  
tive signal wire (connected to the GREEN lead) to pin 47  
on the processor module.  
Valves MUST be connected to the correct processor mod-  
ule terminal to operate properly. Damage to the actuator  
may occur if the valve is improperly connected.  
Hot Water Valves (Fig. 15) — Using a 4-conductor 20 AWG  
cable (two twisted pairs, no shield), connect the hot water  
valve actuator as follows:  
1. Using twist-on wire connectors, connect the BLACK and  
WHITE/BLUE leads inside the actuator junction box to  
the 24 vac power wires of the cable. Connect the other  
ends of the power wires to TB2, pins 11 and 12, in the  
PIC control box.  
2. Using twist-on wire connectors, connect the RED (ϩ) and  
GREEN (−) leads inside the actuator junction box to the  
other 2 wires in the cable. Note the polarity of each wire.  
3. Connect the positive signal wire (connected to the RED  
lead) to pin 43 on the processor module. Connect the nega-  
tive signal wire (connected to the GREEN lead) to pin 44  
on the processor module.  
Duct Static Pressure Probe (VAV Units) — The  
duct static pressure probe is shipped inside the control box.  
Select a location in the ductwork where the static pressure  
will be representative of the static pressure to be monitored  
and maintained (typically 2/3 of the distance down the duct  
from the fan). Install the probe with the tip facing the air-  
flow. See Fig. 17.  
1
Use ⁄4-in. OD approved polyethylene tubing for up to  
50 ft (38-in. OD for 50 to 100 ft) to connect the probe to the  
39L or 39NX unit. Route the tubing back to the mechanical  
room and connect the tubing to the bulkhead fitting labelled  
H (HIGH), located on the bottom edge of the 39L control  
box or top edge of the 39NX control box.  
NOTE: If the probe is more than 100 ft from the control  
box, it is recommended that the static pressure sensor be re-  
moved from the control box and mounted remotely. The sen-  
sor should be mounted closer to the probe and then rewired  
to the original connections in the control box.  
Chilled Water Valves (Fig. 16) — Using a 4-conductor  
20 AWG cable (two twisted pairs, no shield), connect the  
chilled water valve actuator as follows:  
1. Using twist-on wire connectors, connect the BLACK and  
WHITE/BLUE leads inside the actuator junction box to  
the 24 vac power wires of the cable. Connect the other  
ends of the power wires to TB2, pins 9 and 10, in the PIC  
control box.  
NOTE: Connections for 39NX with integral PIC shown. See wiring  
diagrams in Fig. 9 and 12 for terminal connections in 39L control box  
and all remote-mount control boxes.  
Fig. 15 — Hot Water Valve Wiring  
39  
FACTORY WIRING  
FIELD WIRING  
NOTE: Connections for 39NX with integral PIC shown. See wiring  
diagrams in Fig. 9 and 12 for terminal connections in 39L control box  
and all remote-mount control boxes.  
Fig. 16 — Chilled Water Valve Wiring  
Avoid corner locations. Allow at least 3 ft between the  
sensor and any corner. Airflow near corners tends to be re-  
duced, resulting in erratic sensor readings.  
The sensor should be mounted approximately 5 ft up from  
the floor, in the area representing the average temperature.  
Space Temperature Sensor (Fig. 18) — The space  
temperature sensor (SPT) is packaged and shipped inside the  
fan section. It is installed on a building interior wall to mea-  
sure room air temperature.  
The wall plate accommodates both the NEMA (National  
Electrical Manufacturers’ Association) standard and the  
European 14 DIN (Deutsche Industrie Norm) standard. The  
use of a junction box to accommodate the wiring is recom-  
mended for installation. The sensor can be mounted directly  
on the wall, if acceptable by local codes.  
Install the sensor as follows:  
1. Remove sensor cover. Using a small blade screwdriver,  
insert blade into sensor cover latch slot on bottom of slat.  
Gently push upward on the screwdriver to release the cover  
latch. Rotate the cover forward as the screwdriver is re-  
moved.  
2. Snap off the wall plate from the base assembly.  
3. Feed the wires from the electrical box through the sensor  
base assembly.  
DO NOT mount the sensor in drafty areas such as near  
heating or air conditioning ducts, open windows, fans,  
or over heat sources such as baseboard heaters or radiators.  
Sensors mounted in these areas produce inaccurate readings.  
4. Using two 6-32 x 58-in. flat screws, mount the sensor base  
assembly to the electrical box.  
5. Dress the wires down and inside the perimeter of the sen-  
sor base.  
6. Attach the wall plate by snapping it onto the sensor base  
assembly.  
7. Replace the cover by inserting the top inside edge of the  
cover over the tab on top of the sensor base assembly and  
rotating the cover down. Snap cover on.  
Refer to Field Wiring Connections section, page 52 for  
wiring instructions and details. See Table 3 for Thermistor  
Resistance vs. Temperature Values.  
NOTE: Clean sensor with damp cloth only. Do not use  
solvents.  
Fig. 17 — Duct Static Pressure Probe  
40  
NEMA  
National Electrical Manufacturers’ Association  
Fig. 18 — Space Temperature Sensor (P/N HH51BX001)  
Table 3 — Thermistor Resistance vs. Temperature Values for Space Temperature Sensor, Return-Air  
Temperature Sensor, and Supply-Air Temperature Sensor  
RESISTANCE  
(Ohms)  
TEMP  
(F)  
RESISTANCE  
(Ohms)  
TEMP  
(F)  
RESISTANCE  
(Ohms)  
TEMP  
(F)  
RESISTANCE  
(Ohms)  
TEMP  
(F)  
RESISTANCE  
(Ohms)  
TEMP  
(F)  
173,631.0  
168,222.0  
162,998.0  
157,954.0  
153,083.0  
148,378.0  
143,833.0  
139,442.0  
135,200.0  
131,101.0  
127,139.0  
123,310.0  
119,609.0  
116,031.0  
112,571.0  
109,226.0  
105,992.0  
108,863.0  
99,837.3  
96,910.2  
94,078.4  
91,338.6  
88,687.3  
86,121.6  
83,638.4  
81,234.8  
78,908.0  
76,655.3  
74,474.2  
72,362.1  
70,316.7  
68,335.6  
66,416.7  
64,557.9  
62,756.9  
61,012.0  
59,321.1  
57,682.4  
56,094.3  
54,554.9  
53,062.2  
51,615.9  
50,213.1  
48,853.0  
47,533.9  
46,254.7  
45,013.9  
43,810.3  
42,642.6  
41,509.8  
40,410.5  
39,343.9  
−30  
−29  
−28  
−27  
−26  
−25  
−24  
−23  
−22  
−21  
−20  
−19  
−18  
−17  
−16  
−15  
−14  
−13  
−12  
−11  
−10  
−9  
−8  
−7  
−6  
−5  
−4  
−3  
−2  
−1  
0
38,308.7  
37,304.0  
36,328.8  
35,382.1  
34,463.0  
33,570.7  
32,704.2  
31,862.8  
31,045.7  
30,252.0  
29,481.1  
28,732.2  
28,004.6  
27,297.7  
26,610.8  
25,943.4  
25,294.7  
24,664.2  
24,051.4  
23,455.6  
22,876.5  
22,313.4  
21,765.9  
21,233.5  
20,715.7  
20,212.2  
19,722.4  
19,245.9  
18,782.4  
18,331.5  
17,892.8  
17,465.9  
17,050.4  
16,646.1  
16,252.6  
15,869.6  
15,496.8  
15,133.8  
14,780.4  
14,436.4  
14,101.3  
13,775.1  
13,457.3  
13,147.9  
12,846.4  
12,552.8  
12,266.8  
11,988.1  
11,716.6  
11,452.0  
11,194.2  
10,943.0  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
10,698.1  
10,459.4  
10,226.8  
10,000.0  
9,778.9  
9,563.4  
9,353.1  
9,148.2  
8,948.4  
8,753.5  
8,563.4  
8,378.0  
8,197.1  
8,020.7  
7,848.6  
7,680.6  
7,516.8  
7,356.9  
7,200.9  
7,048.6  
6,900.0  
6,755.0  
6,613.4  
6,475.2  
6,340.3  
6,208.5  
6,079.9  
5,954.3  
5,831.7  
5,712.0  
5,595.0  
5,480.8  
5,369.2  
5,260.2  
5,153.7  
5,049.7  
4,948.1  
4,848.8  
4,751.8  
4,657.0  
4,564.4  
4,473.8  
4,385.3  
4,298.9  
4,214.3  
4,131.7  
4,050.9  
3,971.9  
3,894.6  
3,819.1  
3,745.3  
3,673.1  
74  
75  
3602.5  
3533.4  
3465.9  
3399.8  
3335.2  
3272.0  
3210.1  
3149.6  
3090.4  
3032.5  
2975.8  
2920.3  
2866.0  
2812.9  
2760.9  
2710.0  
2660.2  
2611.4  
2563.7  
2516.9  
2471.2  
2426.4  
2382.5  
2339.5  
2297.5  
2256.3  
2215.9  
2176.4  
2137.7  
2099.8  
2062.6  
2026.3  
1990.6  
1955.7  
1921.5  
1887.9  
1855.1  
1822.9  
1791.3  
1760.4  
1730.1  
1700.4  
1671.3  
1642.7  
1614.7  
1587.3  
1560.4  
1534.1  
1508.2  
1482.9  
1458.0  
1433.6  
126  
127  
128  
129  
130  
131  
132  
133  
134  
135  
136  
137  
138  
139  
140  
141  
142  
143  
144  
145  
146  
147  
148  
149  
150  
151  
152  
153  
154  
155  
156  
157  
158  
159  
160  
161  
162  
163  
164  
165  
166  
167  
168  
169  
170  
171  
172  
173  
174  
175  
176  
177  
1409.7  
1386.3  
1363.3  
1340.7  
1318.6  
1296.9  
1275.6  
1254.8  
1234.3  
1214.2  
1194.5  
1175.1  
1156.1  
1137.5  
1119.2  
1101.3  
1083.7  
1066.4  
1049.4  
1032.8  
1016.5  
1000.4  
984.7  
969.2  
954.0  
939.1  
924.5  
910.1  
896.0  
882.2  
868.6  
855.2  
842.1  
829.2  
816.6  
804.1  
791.9  
779.9  
768.2  
756.6  
745.2  
734.0  
723.1  
712.3  
701.7  
691.3  
681.0  
671.0  
661.1  
651.4  
641.8  
632.4  
178  
179  
180  
181  
182  
183  
184  
185  
186  
187  
188  
189  
190  
191  
192  
193  
194  
195  
196  
197  
198  
199  
200  
201  
202  
203  
204  
205  
206  
207  
208  
209  
210  
211  
212  
213  
214  
215  
216  
217  
218  
219  
220  
221  
222  
223  
224  
225  
226  
227  
228  
229  
76  
77  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
91  
92  
93  
94  
95  
96  
97  
98  
99  
100  
101  
102  
103  
104  
105  
106  
107  
108  
109  
110  
111  
112  
113  
114  
115  
116  
117  
118  
119  
120  
121  
122  
123  
124  
125  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
41  
Outdoor-Air Temperature Sensor (Fig. 19) —  
The outdoor-air temperature (OAT) sensor is shipped inside  
the fan section. The OAT sensor continuously monitors the  
temperature of the air outside the building. The integral shield  
prevents ice formation on the sensor conductors. A field-  
supplied conduit junction box is required for installation. See  
Fig. 20.  
Position the OAT sensor so that it accurately senses only  
the outdoor-air temperature. The sensor must be located up-  
stream from outside air dampers and located where it is un-  
affected by interior and duct temperatures. During the unoc-  
cupied (fan off) period the sensor’s location should have a  
minimal effect on its readings.  
Do not mount the sensor in direct sunlight. Inaccurate read-  
ings may result. It may be necessary to field-fabricate a shield  
to protect the sensor from direct sunlight.  
Do not mount the sensor near the exhaust from air-  
handling units or compressors, or near leakage drafts of in-  
door air, or near shrubbery or trees. Inaccurate readings may  
result. Do not mount under direct water runoff. Water may  
freeze around the sensor in winter and produce a false  
reading.  
If sensor wire is shielded, strip back the sensor shield and  
tape it to prevent contact.  
Position the sensor with the slotted end pointed  
downward.  
The field-supplied junction box housing must be threaded  
to screw onto a male 12-in. NPT electrical metal tubing (EMT)  
conduit adaptor. The assembled box and sensor must be mounted  
parallel to the building wall. See Fig. 20. The sensor can  
also be installed on a roof or other location.  
Fig. 20 — Outdoor-Air Temperature  
Sensor Installation  
Mixed-Air Temperature Sensor — The optional  
mixed-air temperature sensor (MAT) is factory wired and  
installed on all units with a factory-installed mixing box (MXB),  
filter mixing box (FMB), or air blender (AMX). On units  
without an AMX, MXB, or FMB, the optional MAT is pack-  
aged and shipped inside the fan section for field installation.  
The field-installed MAT should be mounted downstream  
of the return air duct and filters, but as close as possible to  
the 39L or 39NX unit.  
AVOID repeated bending of copper tubing, as this will  
place stress on the sensor element and lead to eventual  
breakage.  
DO NOT fold or crimp copper tubing.  
USE CARE in forming and securing the element.  
For distances up to 500 ft, use 2-conductor 20 AWG cable  
to connect the sensor to the PIC terminals. Refer to the Field  
Wiring Connections section, page 52 for further wiring in-  
structions. See Table 4 for thermistor resistance according to  
temperature value.  
STRIP back and tape the shield in order to prevent  
contact.  
Table 4 — Thermistor Resistance vs  
Temperature Values for Outdoor-Air  
Temperature Sensor  
Mount field-installed MAT as follows (Fig. 21):  
RESISTANCE TEMPERATURE RESISTANCE TEMPERATURE  
1. Punch a 1-in. diameter hole in the duct and feed the sen-  
sor element through the hole. Mount the utility box on  
the outside of the duct.  
2. Bend the copper tubing surrounding the sensor element  
to conform to the area of the duct. Do not bend it to less  
than 212 in. diameter on any turn. The sensor element  
should be evenly distributed over the entire cross sec-  
tional area of the duct.  
(Ohms)  
(F)  
(Ohms)  
(F)  
168,250  
121,350  
88,500  
65,200  
48,535  
36,476  
27,665  
21,165  
16,325  
12,695  
9,950  
−40  
−31  
−22  
−13  
−4  
5,000.0  
4,028.5  
3,265.0  
2,663.3  
2,185.0  
1,801.5  
1,493.0  
1,244.0  
1,041.5  
876.0  
77  
86  
95  
104  
113  
122  
131  
140  
149  
158  
167  
176  
5
14  
23  
32  
41  
50  
68  
Existing support structures may be used for the sensor  
element, as long as there is no metal-to-metal contact with  
the copper tubing, and the mounting does not interfere  
with other functions.  
739.5  
6,245  
627.5  
3. Use a field-supplied plastic spacer, clamp, and screws to  
secure the sensor in the airstream. See Detail A,  
Fig. 21.  
4. Using 2-conductor 20 AWG plenum-rated cable, connect  
the sensor to the PIC control box terminals.  
Fig. 19 — Outdoor-Air Temperature Sensor  
(P/N HH79NZ023)  
42  
NOTE: This sensor uses a resistance temperature device (RTD)  
element. Polarity is not a consideration.  
When space does not allow working inside the duct, mount  
as follows (Fig. 22):  
1. Open a duct penetration on the opposite side of the sen-  
sor junction box.  
3
2. Wrap the element around a 4-in. PVC pipe, cut holes  
near the center of the duct on both sides and feed the pipe  
with sensor element through the hole.  
3. Secure the seal around the PVC pipe.  
NOTE: If local codes do not permit the use of PVC, use  
EMT instead.  
Refer to Field Wiring Connections section, page 52 for  
wiring instructions and details. See Table 5 for RTD resis-  
tance vs temperature values.  
Table 5 — RTD Resistance vs Temperature Values  
for Mixed-Air Temperature Sensor  
RESISTANCE TEMP RESISTANCE TEMP RESISTANCE TEMP  
(Ohms)  
(F)  
(Ohms)  
(F)  
(Ohms)  
(F)  
693  
719  
745  
772  
799  
827  
854  
883  
912  
−40  
−30  
−20  
−10  
940  
970  
50  
60  
1223  
1257  
1290  
1325  
1360  
1395  
1430  
140  
150  
160  
170  
180  
190  
200  
1000  
1031  
1062  
1093  
1125  
1157  
1190  
70  
Fig. 22 — Alternate Mixed-Air Temperature  
Sensor Installation  
80  
90  
100  
110  
120  
130  
0
10  
20  
30  
40  
Mount the switch as follows:  
1. Position mounting template on duct. Remove adhesive  
Enthalpy Switch (Fig. 23) — The enthalpy switch and  
mounting template are located in a box shipped inside the  
fan section.  
The enthalpy switch is normally mounted in a horizontal  
position with the sensing element exposed to freely circu-  
lating outdoor air.  
backing and press template onto outside air duct.  
1
2. Drill four  
template.  
8-in. mounting holes as indicated on the  
3. Cut out center portion of duct as outlined on template.  
4. Mount controller to duct using screws provided.  
If no outside air duct is present, mount the enthalpy switch  
on a field-supplied and installed plate upstream of the out-  
side air damper.  
Connect the red and blue wires of the enthalpy switch to  
the PIC control box terminals. Refer to Field Wiring  
Connections section, page 52 for further details.  
DO NOT install enthalpy switch in locations where ex-  
cessive moisture, corrosive fumes, and/or vibration are  
present.  
CONTROL RANGES — See Fig. 24 for control settings and  
intermediate settings.  
MOUNTING HOLES  
Y
E
L
R
E
D
D
C
B
L
U
B
A
Fig. 21 — Mixed-Air Temperature Sensor  
(P/N HH79NZ021) Installation  
Fig. 23 — Enthalpy Switch (P/N HH57AC076)  
43  
4. Remove the adhesive backing from the gasket; attach the  
gasket to the outside of the junction box, aligning the holes  
in the gasket with the holes in the box.  
5. Attach the junction box to the duct with the 2 screws  
provided.  
6. Insert the probe assembly through the compression fit-  
ting and into the duct. Tighten screws one half-turn past  
finger tight. Do not overtighten.  
For distances up to 500 ft, use 2-conductor 20 AWG cable  
to connect the sensor to the PIC control box terminals. Refer  
to Field Wiring Connections section, page 32 for further de-  
tails. See Table 3 for thermistor resistance vs. temperature  
values.  
CONTROL SETTINGS  
RELATIVE  
DIAL  
SETTING  
CONTROL  
CURVE  
HUMIDITY (%)  
20  
50  
80  
78 F  
73 F  
68 F  
A
B
C
D
A
B
C
D
(26 C)  
(23 C)  
(20 C)  
73 F  
(23 C)  
68 F  
(20 C)  
63 F  
(17 C)  
68 F  
(20 C)  
63 F  
(17 C)  
59 F  
(15 C)  
62 F  
(17 C)  
58 F  
(14 C)  
53 F  
(12 C)  
Fig. 24 — Enthalpy Control Settings  
Fig. 25 — Supply/Return Air Temperature Sensor  
(P/N HH79NZ019)  
Supply-Air Temperature Sensor (Fig. 25) — The  
supply-air temperature sensor (SAT) measures the tempera-  
ture of the air as it leaves the supply fan. The sensor is factory-  
installed on the fan scroll.  
Return-Air Temperature Sensor (Fig. 25) — The  
return-air temperature sensor (RAT) is shipped inside the fan  
section. It measures the temperature in the return air duct.  
Mount the sensor in the middle of the return air duct ap-  
proximately 4 to 5 ft from the return air damper. The sen-  
sor’s probe tip must be within a straight length of duct.  
Mount the sensor as follows:  
1. Remove the cover of the sensor junction box.  
5
2. Drill or punch a 16-in. hole on the centerline of the re-  
turn air duct as indicated in Fig. 26.  
3. Drill or punch 2 holes through the sensor gasket into the  
fan scroll.  
Fig. 26 — Return-Air Temperature Sensor  
Installation  
44  
Heat Interlock Relay (Fig. 27) — The heat interlock  
relay (HIR) is factory wired and installed on VAV units only.  
It is a single-pole, double-throw (SPDT) relay that provides  
normally-open and normally-closed contacts to interface with  
air terminal units. It allows the air terminals to open when  
the PIC unit goes into the heating mode. The contacts are  
silver cadmium oxide and are rated as follows:  
DO NOT install the duct high humidity switch in lo-  
cations where excessive moisture, corrosive fumes, and/or  
vibration are present. Be sure to allow minimum dimen-  
sions from the elbows or junctions as indicated in  
Fig. 29.  
48 va at 24 vac and .25 power factor  
125 va at 115 vac and .25 power factor  
125 va at 230 vac and .25 power factor  
Mount the DHH as follows:  
1. Position the mounting template on the duct. Remove ad-  
The contact terminations are no. 6 screw terminals.  
NOTE: The HIR is not used in digital air volume control  
(DAV) applications.  
hesive backing and press template onto duct.  
1
2. Drill four  
template.  
8-in. mounting holes as indicated on the  
3. Cut out center portion of duct as outlined on template.  
4. Mount DHH to duct using screws provided.  
For distances up to 500 ft, use 2-conductor 20 AWG  
cable to connect the switch to the PIC control box terminals.  
Refer to Field Wiring Connections section, page 52 for fur-  
ther details.  
2
NC  
The DHH adjustment knob provides settings from 15  
to 95% relative humidity, The scale range is marked on the  
face of the switch. The high humidity set point should be at  
least 65%.  
NOTE: The duct high humidity switch has a relative humid-  
ity differential of 5%.  
COI L  
1
COM  
NO  
Fig. 27 — Relay (P/N HK35AB001)  
Fan Relay — The fan relay is factory wired and installed  
on all 39L and 39NX units. It is a SPST relay that provides  
a normally-open contact. The relay interfaces with the mo-  
tor starter circuit and automatically starts/stops the fan when  
the HOA switch is in the AUTO mode. The contacts are sil-  
ver cadmium oxide and are rated as follows:  
48 va at 24 vac and .25 power factor  
125 va at 115 vac and .25 power factor  
125 va at 230 vac and .25 power factor  
Fig. 28 — Duct High Humidity Switch  
(P/N HL38ZG024)  
The contact terminations are factory wired to TB1.  
Duct High Humidity Switch (Fig. 28) — The duct  
high humidity switch (DHH) is shipped inside the fan sec-  
tion. It is used as a safety input when the humidity control  
options have been ordered. The DHH adjustment knob pro-  
vides settings from 15 to 95% humidity.  
Locate the DHH control element in the duct, downstream  
of the humidifier. Adjust the DHH to the ASHRAE  
(American Society of Heating, Refrigeration, and Air Con-  
ditioning Engineers) recommended maximum setting of 80%.  
Settings higher than 80% are not recommended.  
The DHH is normally mounted in a horizontal position on  
the outside surface of the duct with the sensing element ex-  
posed to freely circulating air.  
Fig. 29 — Duct High Humidity Switch  
Locations  
45  
Wall-Mounted Relative Humidity Sensor (Fig. 30)  
The wall-mounted relative humidity sensor is packaged  
and shipped inside the fan section. It is installed on interior  
walls to measure the relative humidity of the air within the  
occupied space.  
The use of a junction box to accommodate the wiring is  
recommended for installation. The sensor may be mounted  
directly on the wall, if acceptable by local codes.  
DO NOT mount the sensor in drafty areas such as near  
heating or air conditioning ducts, open windows, fans, or over  
heat sources such as baseboard heaters or radiators. Sensors  
mounted in those areas will produce inaccurate readings.  
Avoid corner locations. Allow at least 3 ft between the  
sensor and any corner. Airflow near corners tends to be re-  
duced, resulting in erratic sensor readings.  
Sensor should be vertically mounted approximately 5 ft  
up from the floor, beside the space temperature sensor.  
Install the sensor using 2 screws and 2 hollow wall an-  
chors (if required); do not overtighten screws. See Fig. 31.  
Sensor must be mounted with terminals ACIN and OUTϩ  
located at the top of the sensor as shown in Fig. 32.  
For distances up to 500 ft, use 4-conductor 20 AWG  
cable (2 twisted pairs, no shield) to connect the sensor to the  
PIC control box terminals and power supply. Refer to Field  
Wiring Connections section, page 52 for wiring instructions  
and details.  
The PIC controller has a space relative humidity default  
set point of 40%.  
Fig. 31 — Wall-Mounted Relative Humidity  
Sensor Installation  
Never attempt to clean or touch the sensing element with  
chemical solvents, as permanent damage to the sensor  
will occur.  
Fig. 32 — Wall-Mounted Relative Humidity  
Sensor Positioning  
Fig. 30 — Wall-Mounted Relative Humidity Sensor  
(P/N HL39ZZ001)  
46  
Duct-Mounted Relative Humidity Sensor — The  
duct-mounted relative humidity sensor and mounting tem-  
plate are packaged and shipped inside the fan section. The  
sensor is installed in either the return air ductwork or in the  
outside air ductwork. If 2 relative humidity sensors are or-  
dered for differential enthalpy control, then the sensors must  
be installed in both the return air and outside air ducts. If the  
sensor is used for control of a humidifier, install the sensor  
in the return air duct.  
The PIC controller has a return air relative humidity de-  
fault set point of 40%.  
LOCATION FOR OUTSIDE AIR RELATIVE HUMIDITY  
— Locate the sensor where it accurately measures outdoor  
conditions, yet is protected from the elements. During the  
unoccupied (fan off) period, the sensor’s location should have  
a minimal effect on its readings.  
Fig. 33 — Duct-Mounted Relative Humidity  
Sensor Locations  
LOCATION FOR RETURN AIR RELATIVE HUMIDITY  
— Locate the sensor at least 6 in. upstream or 15 in. down-  
stream of a 90 degree turn in the ductwork. The best loca-  
tion is 15 in. downstream of the 90 degree turn of the duct.  
The probe should be mounted in the center of the duct. See  
Fig. 33.  
Mount the relative humidity sensor (Fig. 34) as follows.  
1. Position mounting template on duct.  
1
2. Drill four  
template.  
8-in. mounting holes as indicated on the  
3. Punch a 118-in. hole as indicated on the mounting  
template.  
4. Mount sensor to duct using four no. 8 screws. Install 9-in.  
sensor probe into the 118-in. hole.  
Never attempt to clean or touch the sensing element with  
chemical solvents, as permanent damage to the sensor  
will occur.  
Mixing Box Linkage — On units with mixing box (MXB)  
or filter mixing box (FMB), the actuator and linkage are fac-  
tory installed. The actuator is directly linked to the outdoor-  
air damper and holds the damper closed. No adjustment is  
necessary.  
For shipping purposes, the secondary linkage rod con-  
necting the outdoor-air and return-air dampers is factory set  
for a closed return-air damper.  
Adjust the secondary linkage as follows:  
1. Open the door of the MXB or FMB to access the return  
air damper crankarm.  
NOTE: On MXB/FMB with top outdoor-air damper, it  
may be necessary to remove the vertical panel holding  
the return-air damper to access the return-air damper  
crankarm.  
2. Loosen the setscrew on the return-air damper crankarm.  
3. Move the damper to its full open position.  
4. Secure the setscrew on the return-air damper crankarm.  
5. Close the MXB or FMB access door.  
Fig. 34 — Duct-Mounted Relative Humidity Sensor  
(P/N HL39ZZ002) Installation  
47  
ADJUSTMENT  
SCREW  
MANUAL RESET  
BUTTON  
Airflow Switch — The airflow switch (AFS) is a snap-  
acting SPDT switch that is factory installed in the PIC con-  
trol box. It senses the air supplied by the 39L or 39NX unit  
and provides the microprocessor module with a 24 vac dis-  
crete signal for fan status. See Fig. 35.  
A length of plenum tubing connects the switch to the probe  
located on the fan side plate.  
The airflow switch range is 0.05 to 2.0 in. wg with a dead-  
band of 0.02 in. wg at minimum set point and 0.1 in. wg at  
maximum set point.  
C
F
NORMALLY  
CLOSED CONTACT  
NORMALLY  
OPEN CONTACT  
TURN SCREW CLOCKWISE  
TO INCREASE AIRFLOW  
CLOSED  
CONTACT  
TURN SCREW COUNTER-  
CLOCKWISE TO DECREASE  
AIRFLOW  
SPDT SNAP  
ACTING  
SWITCH  
LOW-  
PRESSURE  
INLET  
HIGH-  
PRESSURE  
INLET  
MOUNTING BRACKET  
Fig. 36 — Low-Temperature Thermostat  
(P/N HH22CZ001)  
SPDT  
Single-Pole, Double Throw  
Fig. 35 — Airflow Switch (P/N HK06WC030)  
than the condensing unit’s minimum temperature. When in-  
stalled, the thermostat must be set to the minimum operating  
temperature of the condensing unit. If the condensing unit  
has an optional low-ambient control (Motormasterdevice),  
an outdoor-air thermostat is not required.  
The outdoor-air thermostat is an SPST switch; the con-  
tacts open on temperature rise and the set point is adjustable  
from 45 to 75 F (7.2 to 23.9 C). To increase the set point,  
turn the indicator clockwise. See Fig. 37 for thermostat set  
point adjustment and mounting hole locations. Thermostat  
should be mounted inside condensing unit control box where  
it can sense the outdoor air temperature but is protected from  
rain and snow.  
Low-Temperature Thermostat (Fig. 36 ) — The  
optional low-temperature thermostat (LTT) is factory wired  
and installed. It is used to protect the chilled water coil from  
freezing whenever abnormally cold air passes through the  
coil.  
The LTT consists of a 20-ft capillary tube that is serpen-  
tined in the airstream on the entering side of the chilled wa-  
ter coil. It has a range of 34 to 60 F and is factory set at  
35 F.  
The LTT is wired in series with the motor starter fan  
relay. If any 1-ft section of the capillary tube senses cold air  
at or below the thermostat setting, the fan shuts down. Amanual  
reset is provided to restart the fan after the abnormal prob-  
lem is fixed. The temperature setting is field-adjustable.  
To adjust the temperature set point, turn the adjustment  
screw (located on the top of the case) until the position in-  
dicator is at the desired temperature. (A clockwise rotation  
increases the set point.)  
DO NOT set low-temperature thermostat below 35 F.  
Damage to freezestat may result.  
If the temperature exceeds the set point by 5 F or more,  
the reset button will restore the circuit.  
Outdoor-Air Thermostat (Fig. 37) — Also called  
the condensing unit status (CUST) switch, the outdoor air  
thermostat is a temperature-actuated switch used in systems  
with direct-expansion cooling. The thermostat is field-  
installed in the outdoor condensing unit to prevent the sys-  
tem from operating when the outdoor-air temperature is lower  
Fig. 37 — Outdoor-Air Thermostat (Condensing Unit  
Status Switch)  
48  
3. To change or check calibration, use a T assembly with  
3 rubber tubing leads. Attach one lead to the HPS and  
another to an accurate manometer with the appropriate  
range. Apply pressure through the third lead and ap-  
proach set point slowly.  
4. Adjust set point to at least 0.5 in. wg greater than con-  
figured static pressure set point.  
Filter Status Switch — The filter status switch (FLTS)  
is factory-installed in the filter section on all PIC-equipped  
units. The switch is a snap-acting SPDT switch. When dirty  
filter elements cause the pressure drop across the filter me-  
dia to exceed the switch setting, the switch closes and sends  
an alarm signal to the PIC.  
The 39L units use a single switch. In 39NX units, up to  
3 switches can be connected in parallel. When the switches  
are wired in parallel, it is not possible to isolate an alarm  
signal to a single switch.  
Air Quality Sensors (Fig. 39) — The air quality (AQ)  
sensors are shipped inside the fan section for field installa-  
tion. Two types of sensors are supplied; one sensor monitors  
the conditioned air space, and the other sensor monitors the  
return air duct. Both sensors use infrared technology to de-  
tect the levels of CO2 present in the air.  
Sensor descriptions and part numbers are shown in  
Table 6. To mount the sensor, refer to the installation in-  
structions shipped with the sensor.  
The FLTS has an operating range of 0.05 to 2.0 in. wg.  
Factory settings for the switch are as follows:  
Filter Type  
Flat  
Bag/Cartridge  
Final  
Setting (in. wg)  
0.5  
1.0  
1.5  
The FLTS electrical ratings are as follows:  
Table 6 — CO2 Sensor Accessories  
300 va pilot duty at 115 to 277 vac  
10 amps non-inductive to 277 vac  
Rated for NO (normally open) and NC (normally closed)  
contacts.  
CO2 SENSOR ACCESSORY  
DESCRIPTION  
PART NUMBERS  
CGCDXSEN001A00  
CGCDXSEN002A00  
CGCDXSEN003A00  
CGCDXGAS001A00  
CGCDXPRM001A00  
Wall Mount Sensor (No Display)  
Wall Mount Sensor with Display  
Duct Mount Sensor (No Display)  
Sensor Calibration Service Kit  
User Interface Program (UIP)  
High-Pressure Switch (Fig. 38) — The high-  
pressure switch (HPS) is factory installed in the PIC control  
box on VAV units only. It is a snap-acting SPDT switch with  
manual reset that is used to shut down the supply fan when-  
ever the duct pressure reaches the switch setting. The manual  
reset is used to restart the fan after the problem has been  
corrected.  
The switch is factory set at 3.0 in. wg. It has a range of  
1.4 to 5.5 in. wg and can be field adjusted for specific  
applications.  
The CO2 sensors listed in Table 6 are all factory set for a  
range of 0 to 2000 ppm and a linear voltage output of 2 to  
10 vdc. Fig. 40 shows ventilation rates for various CO2 set  
points when outside air with a typical CO2 level of 350 ppm  
is used to dilute the indoor air. Refer to the instructions sup-  
plied with the CO2 sensor for electrical requirements and  
terminal locations.  
Any changes to the sensor’s factory configuration require  
the purchase of the User Interface Program (UIP) or Sensor  
Calibration Service Kit, which also contains the UIP.  
Adjust the high-pressure switch setting as follows:  
1. Loosen conduit enclosure retaining screw, pull firmly on  
the bottom end and snap off cover.  
2. Raise set point by turning slotted adjustment screw  
(located at top of range spring housing) clockwise. Turn  
adjustment screw counterclockwise to lower set point.  
To accurately monitor the quality of the air in the condi-  
tioned air space, locate the sensor near the return air grille  
so it senses the concentration of CO2 leaving the space. The  
sensor should be mounted at least 1 ft above or 1 ft below  
the thermostat to avoid direct breath contact.  
Do not mount the space sensor in drafty areas such as near  
supply ducts, open windows, fans, or over heat sources. Al-  
low at least 3 ft between the sensor and any corner. Avoid  
mounting the sensor where it is influenced by the supply air;  
the sensor gives inaccurate readings if the supply air is blown  
directly onto the sensor or if the supply air does not have a  
chance to mix with the room air before it is drawn into the  
return air stream.  
To accurately monitor the quality of the air in the return  
air duct, locate the sensor at least 6 in. upstream or 15 in.  
downstream of a 90 degree turn in the duct. The downstream  
location is preferred. Mount the sensor in the center of the  
duct.  
If the sensor is mounted in the return air duct, readjust the  
mixed-air dampers to allow a small amount of air to flow  
past the return air damper whenever the mixing box is fully  
open to the outside air. If the damper is not properly ad-  
justed to provide this minimum airflow, the sensor may not  
detect the indoor-air quality during the economizer cycle.  
Fig. 38 — High-Pressure Switch (P/N HH02WC001)  
49  
9A32201  
ZERO  
HI  
of water  
LO  
AN  
SP  
TRANSDUCER :  
0 . 1 in.  
Part Number :  
Range : 0 -  
PRESSURE  
OUT  
Fig. 39 — Air Quality (CO2) Sensor  
(Wall Mount Version Shown)  
Fig. 41 — OAVP Transducer (P/N HK05ZG004)  
Fig. 42 — OAVP Probe (P/N 35DN40007001)  
CO2 CONCENTRATION (PPM)  
Fig. 40 — Ventilation Rates Based on CO2 Set Point  
Constant Outside Air (OAC) Control — This fea-  
ture ensures a continuous supply of outside air to the unit  
and occupied space. The OAC control monitors the outside  
air velocity pressure (OAVP) with a probe and pressure trans-  
ducer. The pressure transducer is factory-installed; the probe  
is factory-supplied for field installation in the outside air ducts.  
See Fig. 41 and 42.  
PROBE INSTALLATION — Locate each probe in a straight  
portion of the outside air duct with any dampers, elbows, or  
fittings at least 2 diameters away. The probe should be in a  
portion of the duct where the airflow is uniform, so that the  
probe senses the average air velocity in the duct. The probe  
must also be located so that measurements at the probe are  
not influenced by the opening or closing of the outdoor-air  
dampers.  
Install the probe at a 90 degree angle to the airflow and  
ensure that the holes in the probe are facing and in line with  
the airflow. The probe tube that is closest to the incoming  
airflow measures velocity pressure; the rear tube measures  
duct static pressure. Use approved plenum tubing to connect  
the probe to the bulkhead fittings on top of the control box.  
NOTE: High-pressure manifold connections shown. Low-pressure con-  
nections are identical and must duplicate high-pressure connections.  
Fig. 43 — Probe Manifolding  
1
For runs up to 150 ft, use 4-in. OD tubing. For runs over  
3
150 ft, use 8-in. OD tubing. Use at least 25 ft of tubing to  
prevent pulsations and erratic operation. Coil any extra tub-  
ing if necessary.  
If the outside air duct is large, additional probes can be  
installed in the duct and manifolded to obtain a more accu-  
rate velocity pressure reading for the entire duct. Manifold  
tubing must be larger than the plenum tubing connecting the  
manifold to the control box. See Fig. 43 and the preceding  
for recommended tube sizes.  
50  
OAC CALIBRATION — Once the probe and tubing are in-  
stalled, input the set point to match the probe readings. Be-  
fore adjusting the OAVP probe, ensure that the supply-air  
fan is providing the maximum design airflow and that the  
outside-air dampers are adjusted for the design outdoor  
airflow intake.  
To calibrate the PIC processor to match the probe loca-  
tion, use a precision manometer to measure the velocity pres-  
sure in the outdoor air duct at design conditions. Use the  
HSIO (local interface device) or Building Supervisor to in-  
put the value as the OAVP set point.  
Note that the probe does not measure true velocity pres-  
sure; when positioned as recommended, the probe measures  
a velocity pressure 1.563 times that of the velocity pressure  
in the duct. This multiplier (magnification) factor varies with  
the probe’s location, and can even be negative if the probe  
is located at an elbow or turn. All OAVP values displayed on  
the HSIO incorporate the multiplier factor to show the true  
duct velocity pressure.  
If the airflow obtained by the preceding method is differ-  
ent from the design airflow or a measurement obtained with  
a balancer, the OAVP probe is not sensing the average duct  
velocity and/or the probe’s multiplier factor is effectively not  
1.563. To match the design or measured airflow to the air-  
flow determined with the preceding formulas, relocate  
the probe as recommended or use the HSIO and service  
function (  
factor.  
) to change the probe multiplier  
FIELD-SUPPLIED OR HIGH-VELOCITY PRESSURE  
TRANSDUCERS — The default pressure transducer in-  
stalled at the factory (P/N HK05ZG004) has a range of 0.00  
to 0.05 in. wg, which matches an air velocity range of ap-  
proximately 225 to 680 fpm. The maximum velocity for op-  
timum OAC operation and response, however, is 620 fpm.  
If the average duct air velocity is greater than 620 fpm, use  
one of the alternate transducers shown in Table 7.  
For a field-supplied pressure transducer, use the service  
If a precision manometer is not available, read the veloc-  
ity pressure value at the HSIO when the system is running  
at maximum design airflow and input that value as the set  
point. During normal operation, the velocity pressure is held  
constant as the supply fan modulates.  
function (  
) to configure the OAC control with  
the transducer’s specifications:  
OALV  
OAHV  
OALR  
=
=
=
Transducer minimum output voltage  
Transducer maximum output voltage  
Transducer low pressure  
USING OAVP VALUES TO DETERMINE DUCT AIR-  
FLOW — It is possible to determine the airflow (cfm) in the  
outside air duct based on the readings obtained by the OAVP  
probe. See the following procedure.  
(range minimum output) value  
Transducer high pressure  
OAHR  
=
(range maximum output) value  
Use the HSIO and status function (  
) to display  
the outside air velocity pressure (Pv) at the transducer.  
Find the average velocity (V) in the duct, in fpm:  
4005  
͌ʲPvʲ = V  
Obtain the cross-sectional area of the duct in sq ft. (A). To  
determine the airflow (F) in the duct, in cfm:  
V x A = F  
Table 7 — OAC Pressure Transducers  
INDICATED VELOCITY  
TRUE VELOCITY PRESSURE  
IN DUCT (in. wg)  
VELOCITY IN DUCT  
(fpm)  
PRESSURE AT  
CARRIER  
PART NO.  
MODUS PART  
NO.  
RANGE  
(in. wg)  
TRANSDUCER (in. wg)  
Optimum  
Range  
Theoretical  
Range  
Optimum  
Range  
Theoretical  
Range  
Optimum  
Range  
Theoretical  
Range  
HK05ZG004 T40-005C-04-013 0.00 — 0.05 0.013 — 0.037 0.005 — 0.045 0.008 — 0.024 0.003 — 0.029 360 — 620 225 — 680  
HK05ZG005 T40-001C-04-012 0.00 — 0.10 0.025 — 0.075 0.010 — 0.090 0.016 — 0.048 0.006 — 0.057 505 — 875 320 — 960  
HK05ZG006 T40-003C-04-015 0.00 — 0.30 0.075 — 0.225 0.030 — 0.270 0.048 — 0.144 0.019 — 0.173 875 — 1520 555 — 1665  
51  
Select a 20 AWG twisted pair, no shield cable. Connect as  
per table below:  
Field Wiring Connections — All field wiring must  
comply with National Electric Code (NEC) and all local re-  
quirements. The recommended wiring is as follows:  
PROCESSOR  
MODULE  
PIN NO.  
Dampers, actuators,  
and valves  
Sensors  
4-conductor 20 AWG cable  
(2 twisted pairs, unshielded)  
2-conductor 20 AWG cable  
(one twisted pair, unshielded)  
SENSOR  
Return-air temperature sensor (RAT)  
Outside-air temperature sensor (OAT)  
Enthalpy switch (ENT)  
Mixed-air temperature sensor (MAT)  
Space temperature sensor (SPT)  
20 and 21  
5 and 6  
34 and TB2-3  
8 and 9  
Refer to Table 8 for recommended brands and part  
numbers.  
17 and 18  
NOTE: The MAT is factory wired on all units with a factory-installed  
mixing box, filter mixing box, or air blender.  
Table 8 — Recommended Sensor and  
Device Wiring  
SPACE TEMPERATURE SENSOR (SPT) — The space tem-  
perature sensor cover includes terminal block TB1, a jumper  
between Pin E2 and Pin E3, and an RJ11 female connector.  
The RJ11 female connector connects the service tool with  
the Carrier Comfort Network.  
PART NUMBER  
MANUFACTURER  
Regular*  
Plenum*  
Alpha  
American  
Belden  
Columbia  
Manhattan  
Quabik  
1895  
A21501  
8205  
D6451  
M13402  
6130  
A48301  
88442  
M64430  
Jumper MUST be in place between Pin E2 and Pin E3  
or inaccurate readings could result. Ensure that the jumper  
is in place before installing the sensor.  
*Within a building.  
NOTE: Wiring is 20 gage, 2-conductor twisted cable.  
REMOTE LOCAL INTERFACE DEVICE (HSIO) — When  
ordered as part of a 39L or 39NX unit, the HSIO is factory-  
installed and fully wired.  
To reinstall the HSIO in a remote location away from the  
control box, refer to the factory wiring connections in  
Fig. 9-12 and proceed as follows:  
Using a 20 AWG twisted pair conductor cable rated for  
the application, connect one wire of the twisted pair to  
Terminal T1 and connect the other wire to Terminal T2 on  
TB1. See Fig. 45.  
The other ends of the wires are connected to the processor  
(PSIO master) module. As polarity is not a consideration,  
connect one wire to Terminal 17 and one wire to Terminal  
18 of the processor module.  
1. Use a 20 AWG 2-conductor twisted wire pair (Belden  
No. 8205 or equivalent) to supply power to the HSIO mod-  
ule. Use a 20 AWG 3-conductor cable shielded with drain  
wire (Belden No. 8772 or equivalent) for communication  
with the HSIO. Cable length must not exceed 1000 ft.  
2. Pull the 2 cables (power and signal) through the electri-  
cal conduit to the NEMA standard box or HSIO. Leave  
approximately 4 ft of wire in the PIC control box for  
terminations.  
3. Route the cables from the PIC control box to the HSIO  
bracket. Secure the HSIO cables to the existing cables  
using either tie wraps or by twisting the HSIO cables around  
the existing cables. Strip back the jacket 6 in. on each  
cable after cutting off the excess. Connect the power cable  
at the PIC control box to the existing 3-pin connector hang-  
ing at the HSIO bracket. The wires should be terminated  
in the screw-type locking clamps on Terminals 1 and 2.  
RJ11 Plug Wiring — Refer to the Carrier Comfort Network  
Interface, page 64, for communication bus wiring and cable  
selection. The cable selected must be identical to the CCN  
communication bus wire used for the entire network.  
Cut the CCN wire and strip the ends of the RED, WHITE,  
and BLACK conductors. Insert and secure the RED (ϩ) wire  
to Pin J2 of the SPT terminal strip TB1. Insert and secure the  
WHITE (ground) wire to Pin J3 of the SPT terminal strip  
TB1. Insert and secure the BLACK (−) wire to Pin J5 of  
SPT terminal strip TB1.  
The other end of the communication bus cable must be  
connected to the remainder of the CCN communication bus  
at the COMM1 plug on the processor (PSIO master) mod-  
ule. Refer to Carrier Comfort Network Interface section,  
page 64, for more details.  
4. Connect the signal cable at the PIC control box to the  
existing 4-pin communications connector hanging at the  
HSIO bracket. The wires should be terminated in the lock-  
ing clamps on Terminals 1, 2, and 3. The shield should be  
terminated at the HSIO bracket (ground). Be sure to note  
the color coding used on the cable for later reference when  
terminating the other end of the cable.  
5. At the NEMA standard box or HSIO, connect the power  
conductors to Pin 1 and 2 of the 3-pin plug. Using the  
color coding from the above step, connect the signal cable  
to Pin 1, Pin 2, and Pin 3 of the 4-pin communications  
connector. Remove the shield and drain wire from this  
end of the cable.  
DAMPER ACTUATORS — The PIC processor can activate  
a field-installed modulating exhaust/relief damper. This is  
achieved by wiring the factory-supplied damper actuator in  
series with the factory-supplied and field-installed mixing  
box damper actuator.  
The PIC processor can also activate a field-installed damper  
actuator mounted in a field-supplied mixing box. These ac-  
tuators are available from the factory when ordered as an  
option with the unit.  
See Table 9 for recommended actuators.  
NOTE: The actuator selected must be capable of receiving  
a 4 to 20 mA signal and must have a total impedance of less  
than 250 ohms. Wire should be 20 gage minimum, twisted-  
pair type and rated for the application.  
6. After the HSIO is installed inside the remote cover, con-  
nect the 4-pin and 3-pin plugs to the HSIO.  
RETURN-AIR TEMPERATURE SENSOR, OUTDOOR-  
AIR TEMPERATURE SENSOR, ENTHALPY SWITCH,  
AND MIXED-AIR TEMPERATURE SENSOR — Wires are  
to be connected to the proper terminals on the processor mod-  
ule. See Fig. 44 for details.  
52  
LEGEND  
ENT  
MAT  
OAT  
RAT  
SPT  
Enthalpy Switch  
Mixed-Air Temperature Sensor  
Outside-Air Temperature Sensor  
Return-Air Temperature Sensor  
Space Temperature Sensor  
Field Wiring  
NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in  
Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount  
control boxes.  
Fig. 44 — Field Wiring of Sensors  
To prevent equipment damage: Power must NOT be con-  
nected to an earth ground; actuator case must NOT be  
connected to control input terminals.  
Field-Supplied Exhaust Damper — Wire the 4 to 20 mA sig-  
nal of the factory-supplied exhaust damper actuator as fol-  
lows (Fig. 46):  
1. Select a 20 AWG twisted pair conductor cable rated for  
the application. Identify the positive (ϩ) and negative (−)  
signal contacts on the actuator.  
2. Install cable from the actuator to the PIC control box.  
3. Remove jumper no. 84 from between terminals TB2, 7  
and 8. Connect positive (ϩ) lead to terminal 8 of TB2.  
Connect negative (−) lead to terminal 7 of TB2.  
Field-Supplied Modulating Mixing Box — Wire the 4 to  
20 mA signal of the factory-supplied damper actuator as fol-  
lows (Fig. 47):  
1. Select a 20 AWG twisted pair conductor cable rated  
for the application. Identify the positive (ϩ) and  
negative (−) signal contacts on the actuator.  
2. Install cable from the actuator to the PIC control box.  
3a. For the outside-air damper (OAD) actuator, connect the  
positive (ϩ) lead to pin 40 of the processor module. Con-  
nect the negative (−) lead to terminal 6 of terminal block  
2 (TB2).  
b. If the actuator is factory-supplied, connect the actua-  
tor’s 24 vac power wires to TB2, terminals 19 and 20.  
If the actuator is field-supplied, connect the power wires  
to a separate, isolated 24 vac power source.  
IMPORTANT: Jumper may be connected from E1 to E3. Move jumper to  
connect E2 and E3 before installing sensor, otherwise incorrect space tem-  
perature values are generated.  
Fig. 45 — Space Temperature Sensor Wiring  
For factory-supplied actuators that are field-installed, the  
24 vac power source is included with the unit wired in the  
control box. For field-supplied actuators, a 24 vac power source  
must be field-supplied and installed for each actuator.  
53  
Table 9 — Recommended Actuators  
DAMPER AREA  
(sq ft)  
PART  
NO.  
VOLTAGE  
(50/60 Hz)  
IMPEDANCE  
(Ohms)  
SIGNAL INPUT  
(mA)  
TORQUE  
(in.-lb)  
VA (24 vac)  
STROKE  
Parallel  
Opposed  
HF27BB006  
HY27BB001*  
HF27BB010  
24  
24  
24  
18  
60  
44  
82.5  
250.0  
82.5  
4 to 20  
4 to 20  
4 to 20  
8.4  
42  
106  
10.8  
54  
137  
15  
50  
190  
2 in.  
180°  
312 in.  
*Shipped with drive HF39CB001, which must be field-installed on actuator.  
NOTES:  
HY27BB001 - BLACK and WHITE (24 vac)  
ORANGE (ϩ signal)  
BLUE (− signal)  
1. All actuators are spring return.  
HF27BB010 - WHITE/BLUE and BLACK (24 vac)  
2. Damper area ratings are nominal and are based on standard (NOT low leak)  
dampers at 1.0 in. wg pressure and 2000 fpm velocity.  
3. Actuator wire coding is as follows:  
RED (ϩ signal)  
GREEN (− signal)  
HF27BB006 - BLACK and WHITE (24 vac)  
RED (ϩ signal)  
4. Actuator HH27BB006 is equipped with 20 ft of plenum cable. Wires for ac-  
tuators HY27BB001 and HF27BB010 are in the actuator junction box.  
5. Actuators are available as an option when ordered with the unit.  
GREEN (− signal)  
The approved building fire alarm system must provide 4  
different normally-open dry contact closures. A field-  
supplied 24 vac, double-pole, double-throw (DPDT) fire shut-  
down (FSD) relay rated for the application (240 vac with a  
10 amp minimum) is required.  
LEGEND  
All power going through the smoke control panel dry con-  
tacts and the FSD relay coil is furnished by the PIC control  
box. A 24 vac fused power source uses a factory-installed  
3 amp in-line fuse. See Fig. 49 or 50 for smoke control op-  
tion wiring details.  
Field Wiring  
Exhaust Air  
Damper Actuator  
EXD  
Wire as follows:  
1. Disconnect all power at the unit, PIC control box,  
return fan (if applicable), and fire panel.  
2. Wire the supply fan motor starter per Fig. 8.  
3. If applicable, wire the return fan as shown in Fig. 49 or  
50.  
Fig. 46 — Exhaust Damper Actuator Wiring (Smoke  
Control Option or Modulating Dampers)  
NOTE: Return fan power may be different from supply  
fan power.  
4a. For the return-air damper (RAD) actuator, connect the  
positive (ϩ) lead to TB2, terminal 6. Connect the nega-  
tive (−) lead to TB2, terminal 7.  
b. If the actuator is factory-supplied, connect the actua-  
tor’s 24 vac power wires to TB2, terminals 21 and 22.  
If the actuator is field supplied, connect the power wires  
to a separate, isolated 24 vac power source.  
4. Connect leads from the return fan HOA switch to  
terminals 9 and 10 of TB5.  
5. Wire the first set of contacts of the DPDT FSD. For fire  
shutdown of the unit from a local smoke detector, wire  
ONLY the normally-closed contacts (NEC, class 1 power  
rated) to the hot leg of the fan power supply and ter-  
minal 2 of TB1.  
Field-Supplied Two-Position Damper — The factory-  
supplied SPDT relay must be field-installed and wired. The  
relay contacts are rated as follows:  
6. Terminal 8 of TB5 is internally connected to ground.  
Connect one side of the EVAC, PURG, and PRES dry  
contacts of the smoke control panel to terminal 8 of TB5.  
48 va at 24 vac and .25 service factor  
125 va at 115 vac and .25 service factor  
125 va at 230 vac and .25 service factor  
7. Connect the other side of the PRES dry contact to ter-  
minal 3 of TB5. Connect the other side of the PURG  
dry contact to terminal 4 of TB5. Connect the other side  
of the EVAC dry contact to terminal 5 of TB5.  
8. Connect the normally-open dry contacts of the FSD de-  
vice (smoke detector with auxilary relay and/or smoke  
control panel dry contact set) to terminal 1 and 2 of TB5.  
The relay provides a set of contacts (normally open and nor-  
mally closed) using no. 6 screw terminals; the 24 vdc coil  
1
connections are through 4-in. quick connects.  
Using a 20 AWG twisted cable, connect the relay coil con-  
tacts 1 and 2 to the processor module pins 41 and 42. See  
Fig. 48.  
9. Connect the 24 vac relay coil of the FSD relay to ter-  
minals 1 and 8 of TB5.  
To connect the field-supplied two-position damper actua-  
tor (Fig. 48): Connect one contact of the actuator to the  
normally-open contact of the relay. Connect the common con-  
tact of the relay to one leg of the power source. Connect the  
other contact of the actuator to the other leg of the power  
source.  
10. Connect the second pole of the FSD relay to the hot leg  
of the return fan power supply and to terminal 11 of TB5.  
Refer to Fig. 49 or 50 for point-to-point wiring of the smoke  
control option inside the PIC control box.  
SMOKE CONTROL OPTION — The smoke control option  
includes 3 relays which control the 4 different modes of the  
option. These relays are factory wired. Terminal block 5 (TB5)  
provides an easy means to wire the field-supplied smoke con-  
trol panel to the PIC controller on the 39L or 39NX unit. See  
Fig. 49 and 50.  
54  
LEGEND  
OAD  
RAD  
Outside Air Damper  
Actuator  
Return Air Damper  
Actuator  
Factory Wiring  
Field Wiring  
*Field-installed if only outside air damper is used.  
NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in  
Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount  
control boxes.  
Fig. 47 — Field-Supplied Mixing Box Actuator Signal Wiring  
LEGEND  
OAD  
Outside Air Damper  
Actuator  
Field Wiring  
Fig. 48 — Field-Supplied Two-Position Damper Relay and Actuator Wiring  
55  
LEGEND  
AO  
Analog Output  
RFR  
SF  
Return Fan Relay  
Supply Fan Contactor  
Supply Fan Relay  
Terminal Block  
EVAC  
EXD  
FSD  
HOA  
HPS  
LTT  
Evacuation  
Exhaust Air Damper Actuator  
Fire Shut Down  
SFR  
TB  
HAND/OFF/AUTO Switch  
High-Pressure Switch  
Low Temperature Thermostat  
Outside Air Damper Actuator  
Pressurization  
TRAN  
Transformer  
Remove Jumper  
OAD  
PRES  
RAD  
Factory Wiring  
Field Wiring  
Return Air Damper Actuator  
NOTE: The return fan power circuit may be different than the supply  
fan starter power.  
Fig. 49 — Smoke Control Option Wiring Schematic (39L)  
56  
LEGEND  
AO  
Analog Output  
Evacuation  
RFR  
SF  
Return Fan Relay  
Supply Fan Contactor  
Supply Fan Relay  
Terminal Block  
EVAC  
EXD  
FSD  
HOA  
HPS  
LTT  
Exhaust Air Damper Actuator  
Fire Shut Down  
SFR  
TB  
HAND/OFF/AUTO Switch  
High-Pressure Switch  
TRAN  
Transformer  
Factory Wiring  
Field Wiring  
Low Temperature Thermostat  
Outside Air Damper Actuator  
Pressurization  
OAD  
PRES  
RAD  
Return Air Damper Actuator  
*Factory installed and wired if ordered with exhaust box.  
NOTE: Return fan power circuit may be different than the supply fan  
starter power.  
Fig. 50 — Smoke Control Option Wiring Schematic (39NX)  
57  
ANALOG DEVICE FOR ANALOG OUTPUT TEMPERA-  
TURE CONTROL — The analog controlled device selected  
must be capable of receiving a 4 to 20 mA signal. Its internal  
impedance must not exceed 600 ohms.  
DISCRETE OUTPUT DEVICE UNDER TIMECLOCK  
CONTROL — The factory-supplied SPDT relay must be field  
installed and wired. (Fig. 52.) The relay contacts are rated as  
follows:  
The power supply of the analog device must be field in-  
stalled.  
Using a 20 AWG twisted wire pair, wire the control signal  
as follows (Fig. 51).  
48 va at 24 vac and .25 power factor  
125 va at 115 vac and .25 power factor  
125 va at 230 vac and .25 power factor  
The relay provides a set of contacts (normally open and nor-  
mally closed) using no. 6 screw terminals while the 24 vdc  
1. Connect the positive (ϩ) contact to pin 46 of the option  
1
coil connections are through 4-in. quick connects.  
module.  
Using a 20 AWG twisted cable, connect the relay coil con-  
tacts to the option module pins 53 and 54. Connect the de-  
vice to be controlled to the normally-open or normally-  
closed contacts of the relay. Pay close attention to the contact  
ratings listed above. See Fig. 54.  
2. Connect the negative (−) contact to pin 47 of the option  
module.  
DEVICE UNDER DISCRETE OUTPUT TEMPERATURE  
CONTROL — The factory-supplied SPDT relay must be field  
installed and wired. See Fig. 52. The relay contacts are rated  
as follows:  
48 va at 24 vac and .25 power factor  
125 va at 115 vac and .25 power factor  
125 va at 230 vac and .25 power factor  
The relay provides a set of contacts (normally open and nor-  
mally closed) using no. 6 screw terminals while the 24 vdc  
2
NC  
1
coil connections are through 4-in. quick connects.  
Using a 20 AWG twisted cable, connect the relay coil con-  
tacts 1 and 2 to the option module pins 50 and 51. Connect  
the device to be controlled to the normally-open or normally-  
closed contacts of the relay. Pay close attention to the con-  
tact ratings listed above. See Fig. 53.  
COI L  
1
COM  
NO  
Fig. 52 — Single-Pole, Double-Throw (SPDT) Relay  
Field Wiring  
Fig. 51 — Wiring of Analog Device for Analog Output Temperature Control  
58  
Field Wiring  
Field Wiring  
Fig. 55 — Wiring of the Modulating Valve for  
Analog Output Humidity Control  
NOTE: The relay furnished is a SPDT relay with silver cadmium ox-  
ide contacts, rated as follows:  
48 va at 24 vac and .25 power factor  
125 va at 115 vac and .25 power factor  
125 va at 230 vac and .25 power factor  
Two-Stage Humidification Control Relays — Two SPDT  
relays with silver cadmium contacts are shipped with the unit  
when 2-stage humidification control is requested. See  
Fig. 52. The relays are rated as follows:  
Fig. 53 — Wiring of Device Under Discrete Output  
Temperature Control  
48 va at 24 vac and .25 power factor  
125 va at 115 vac and .25 power factor  
125 va at 230 vac and .25 power factor  
The relays must be field installed within a field-supplied en-  
closure rated for the application.  
Wire the stage 1 relay as follows: Connect the 24 vac coil  
contacts 1 and 2 to pins 41 and 42 of the option module. The  
stage 1 relay is intended to open a normally-closed steam  
valve and not energize the spray pump. See Fig. 56 for field  
wiring of the stage 1 valve and steam pump.  
Wire the stage 2 relay as follows: Connect the 24 vac coil  
contacts 1 and 2 to pins 44 and 45 of the option module. The  
stage 2 relay is intended to open a second normally-closed  
steam valve. See Fig. 56 for field wiring of the stage 2 valve.  
Duct High Humidity Switch — The humidistat is factory sup-  
plied and field installed. It is shipped (with a template) in its  
own box.  
All wiring must comply with applicable local codes and  
ordinances. Wire the DHH as follows:  
1. Turn switch on PIC control box to OFF.  
Field Wiring  
NOTE: The relay furnished is a SPDT relay with silver cadmium ox-  
ide contacts, rated as follows:  
48 va at 24 vac and .25 power factor  
125 va at 115 vac and .25 power factor  
125 va at 230 vac and .25 power factor  
Turn switch on PIC control box to OFF before con-  
necting DHH wiring, otherwise electrical shock or  
equipment damage can result.  
Fig. 54 — Wiring of Discrete Output Device  
Under Timeclock Control  
2. Connect wire from terminal 3 of terminal block 2 (TB2)  
to the terminal labeled ORANGE on the DHH sensor. See  
Fig. 57.  
3. Connect wire from pin 7 of the option module to the sen-  
sor screw terminal labelled RED.  
During humidification, the duct high humidity switch must  
be set to the maximum humidity level desired in the supply  
duct (80% minimum).  
Duct Mounted/Wall Mounted Relative Humidity Transmit-  
ter (Fig. 58) — Identify the power terminal block (ACIN)  
and signal terminal block (OUT). See Fig. 59 and 60. Using  
20 AWG twisted wire pair, connect the 24 vac power to the  
terminal labeled ACIN.  
HUMIDIFICATION DEVICES  
Modulating Valve for Analog Output Humidity Control  
(Fig. 55) — Valve selected must be able to receive a 4 to  
20 mAsignal and must NOT exceed an impedance of 600 ohms.  
Valve power supply must be field-installed and isolated.  
Install valve on humidifier piping and connect actuator power  
supply. Using a 20 AWG twisted wire pair, connect the posi-  
tive (ϩ) contact of the valve actuator to pin 40 of the option  
module. Connect the negative (−) contact of the valve ac-  
tuator to pin 41 of the option module.  
59  
Field Wiring  
NOTE: The relay furnished is a SPDT relay with silver cadmium oxide contacts, rated as follows:  
48 va at 24 vac and .25 power factor  
125 va at 115 vac and .25 power factor  
125 va at 230 vac and .25 power factor  
Fig. 56 — Wiring of Two-Stage Humidification Control Relays  
The power for the relative humidity transmitters may be  
sourced from the valve 24 vac power source at wire no. 6  
and 7 or at wire no. 4 and 5.  
Connect the signal wires as follows: Secure one wire to  
the terminal labelled OUT ϩ (located at the right of terminal  
block OUT). Secure the other wire to the negative signal  
output terminal (terminal adjacent to the terminal labelled  
OUT ϩ). Run the twisted pair of signal wires to the PIC  
control box. Observe all local code requirements.  
Outdoor Relative Humidity Transmitter: Connect the posi-  
tive (ϩ) wire to pin 31 of the processor module. Connect the  
negative (−) wire to pin 32 of the processor module.  
Return Air or Space Relative Humidity Transmitter;  
Connect the positive (ϩ) wire to pin 10 of the processor mod-  
ule. Connect the negative (−) wire to pin 11 of the processor  
module. See Fig. 61.  
Field Wiring  
NOTE: Connections for 39NX with integral PIC shown. See wiring diagrams in  
Fig. 9 and 12 for terminal connections in 39L control box and all remote-mount  
control boxes.  
Fig. 57 — Wiring of the Duct  
High Humidity Switch  
The 24 vac power source(s) to both duct mounted and  
wall mounted relative humidity transmitters MUST be  
isolated. Connecting either side to a ground will per-  
manently damage the sensor.  
Fig. 58 — Field-Installed Relative  
Humidity Transmitters  
60  
Field Wiring  
Fig. 59 — Duct Mounted Relative Humidity  
Transmitter Wiring  
Fig. 60 — Wall Mounted Relative Humidity  
Transmitter Wiring  
LEGEND  
RH  
Relative Humidity  
Field Wiring  
Fig. 61 — Wiring of Relative Humidity Transmitters  
61  
AIR QUALITY SENSOR — Air quality (AQ) sensors are  
CO2 sensors shipped inside the fan section for field instal-  
lation. To wire the sensors after they are mounted in the con-  
ditioned air space and return air duct, see Fig. 62 and the  
instructions shipped with the sensors. For each sensor, use  
two 2-conductor 20 AWG twisted-pair cables (unshielded)  
to connect the separate 24 vac power source to the sensor  
and the sensor to the option module (PSIO slave) terminals.  
To connect each AQ sensor to the option module, identify  
the positive (ϩ) and negative (−) terminals on the sensor;  
connect AQ1 to terminals 25 and 26 and connect AQ2 to  
terminals 28 and 29.  
Note that if the velocity pressure of the supply and/or re-  
turn air is below 0.75 in. wg, the system may require trans-  
ducers with lower ranges than those of the default factory-  
supplied transducers. As a general rule, size transducers  
so that the maximum air velocity pressure is 75% of the  
transducer’s maximum value. For example, if the 39L or  
39NX unit produces a maximum air velocity pressure of  
0.15 in. wg, a transducer with a maximum value of  
0.20 in. wg can be used. Sizing the transducers according to  
these guidelines ensures that they have good resolution.  
Factory-Supplied Return Fans with Inlet Guide Vanes  
(IGVs) are factory wired except for the air supply control  
signal from the airflow monitoring stations, which is con-  
nected in the field to the bulkhead fitting.  
OUTSIDE AIR VELOCITY PRESSURE (OAVP) SEN-  
SOR — The OAVP sensor is factory installed and wired. As  
shown in Fig. 62, the sensor’s power wiring is connected to  
TB2, 9 and 10 for 39L units or TB2, 29 and 30 for 39NX  
units; the signal leads are connected to terminals 31 and 32  
in the option module.  
Return Fans with Field-Supplied IGVActuators must be able  
to receive a 4 to 20 mA signal and may NOT have an im-  
pedance of more than 600 ohms. An isolated power source  
must be field-supplied and installed. See Table 9 for  
recommended actuators.  
To install actuators, see Fig. 65. Using a 2-conductor  
20 AWG conductor cable (one twisted pair, unshielded) rated  
for the application, connect the positive (ϩ) wire to terminal  
37 in the option module. Connect the negative (−) wire to  
terminal 38. Connect the 24 vac power leads to TB2,  
terminals 23 and 24.  
Field-Supplied Return Fans with Variable Frequency Drives  
must have 4 to 20 mA signal input boards and their own  
field-supplied and installed power sources.  
To install return fans with variable frequency drives,  
see Fig. 66. Using a 2-conductor 20 AWG conductor cable  
(one twisted pair, unshielded) rated for the application, con-  
nect the positive (ϩ) signal wire to terminal 37 in the  
option module. Connect the negative signal (−) wire to  
terminal 38.  
The supply fan minimum set point must be equal to the  
return fan minimum airflow, plus the delta airflow that is to  
be maintained.  
LEGEND  
AQ  
OAVP  
Air Quality Sensor  
Outside Air Velocity Pressure Sensor  
Field Wiring  
Factory Wiring  
NOTE: See unit label diagram or Fig. 12 for remote-mount control  
box connections.  
Fig. 62 — Air Quality and OAVP Sensor Wiring  
FAN VOLUME CONTROL (Fig. 63)  
IGV  
Inlet Guide Vane  
Field Wiring  
Airflow Monitoring Stations are field-selected and field-  
installed in the supply and return air ducts; see Fig. 63.  
Install each monitoring station in a straight portion of the  
duct with any upstream or downstream elbows or fittings at  
least 2.5 diameters away.  
NOTE: Air monitoring stations are field supplied and installed; pres-  
sure transducers are factory supplied and installed.  
Fig. 63 — Field-Installed Fan Volume Control  
Use approved plenum tubing to connect each monitoring  
station to the bulkhead fittings on top of the control box. For  
1
runs up to 50 ft, use 4-in. OD tubing. For runs over 50 ft,  
3
use ⁄8-in. OD tubing.  
Differential Pressure Transducers for fan volume control are  
factory-installed in the control box (two are supplied). The  
power supply for the transducers is also factory installed.  
Both transducers have pressure ranges of 0.0 to 1.0 in. wg  
and produce 2 to 10 vdc signals. See Fig. 64 for wiring  
details.  
62  
LEGEND  
RVP  
SVP  
Return Velocity Pressure Transducer  
Supply Velocity Pressure Transducer  
Field Tubing  
NOTE: Connections for 39NX with integral PIC shown. See wiring  
diagrams in Fig. 9 and 12 for terminal connections in 39L control box  
and all remote-mount control boxes.  
Fig. 64 — Fan Volume Control — Differential Pressure Transducer (P/N HK05ZG007) Factory Wiring  
Field Wiring  
Fig. 66 — Wiring of Return Fan Volume Control  
with Variable Frequency Drive  
NOTE: Connections for 39NX with integral PIC shown. See wiring  
diagrams in Fig. 9 and 12 for terminal connections in 39L control box  
and all remote-mount control boxes.  
Fig. 65 — Wiring of Return Fan Volume Control  
with IGVs  
63  
Pulse-Type Meter (Fig. 67) — Monitors power usage, which  
is passed through the Carrier Comfort Network (CCN) for  
use by the loadshed module of the Building Supervisor. The  
meter must provide a dry contact signal (not exceeding 4 Hz  
maximum). Using a 2-conductor 20 AWG shielded twisted-  
pair conductor cable, connect one wire to terminal 35 of the  
option module and the other wire to terminal 36. Connect  
the drain wire to the ground lug inside the PIC control box  
and remove the drain wire and shield on the meter end of the  
cable. Tape to insulate, if required.  
SIGNAL  
TYPE  
CCN BUS CONDUCTOR  
INSULATION COLOR  
COMM1 PLUG  
PIN NO.  
ϩ
Ground  
RED  
WHITE  
BLACK  
1
2
3
If a cable with a different color scheme is selected, a simi-  
lar color code should be adopted for the entire network.  
At each system element, the shields of its communication  
bus cables must be tied together. If the communication bus  
is entirely within one building, the resulting continuous shield  
must be connected to ground at only one point. See Fig. 69.  
If the communication bus cable exits from one building and  
enters another, the shields must be connected to ground at  
the lightning suppressor in each building where the cable  
enters or exits the building (one point only).  
To connect the 39L or 39NX unit to the network, proceed  
as follows (Fig. 69):  
1. Turn power to the PIC control box to OFF.  
2. Remove the COMM1 plug from the processor module.  
3. Cut the CCN wire and strip the ends of the RED, WHITE,  
and BLACK conductors.  
4. Using a wire nut, connect the 2 drain wires together.  
5. Insert and secure the 2 RED wires to terminal 1 of the  
COMM1 plug.  
6. Insert and secure the 2 WHITE wires to terminal 2 of the  
COMM1 plug.  
7. Insert and secure the 2 BLACK wires to terminal 3 of the  
COMM1 plug.  
Field Wiring  
Fig. 67 — Pulse-Type Meter Wiring  
ELECTRIC HEATER — The electric heater is factory wired  
and installed and is controlled by the PIC processor and DSIO.  
There is no field wiring or installation required.  
CARRIER COMFORT NETWORK INTERFACE — The  
Carrier Comfort Network (CCN) communication bus wiring  
is supplied and installed by the electrical contractor. It con-  
sists of shielded, 3-conductor cable with drain wire.  
The system elements are connected to the communication  
bus in a daisy-chain arrangement. The positive pin of each  
system element communication connector must be wired to  
the positive pins of the system element on either side of it;  
the negative pins must be wired to the negative pins; the sig-  
nal ground pins must be wired to signal ground pins. See  
Fig. 68 for location of the CCN communication plug (COMM1)  
on the processor module.  
NOTE: Conductors and drain wire must be 20 AWG mini-  
mum, stranded tinned copper. Individual conductors must be  
insulated with PVC, PVC/nylon, vinyl, Teflon, or polyeth-  
ylene. An aluminum/polyester 100% foil shield and an outer  
jacket of PVC, PVC/nylon, chrome vinyl, or Teflon with a  
minimum operating temperature range of −20 C to 60 C  
is required. See Table below for cables that meet the  
requirements.  
Fig. 68 — CCN Sensor Plug and Communication  
Plug Locations  
OUTDOOR-AIR THERMOSTAT — Use field-supplied,  
2-conductor 20 AWG wire to connect the thermostat to the  
DSIO and terminal block in the PIC control box. See  
Fig. 70. Connect one wire between the thermostat and J3-1  
on the DSIO. For 39NX units, connect a second wire be-  
tween the other thermostat terminal and TB3-9 (TB2-10 for  
39L units). For 39NX units, connect a third wire between  
J3-2 on the DSIO and TB4-10 (TB2-9 on 39L units).  
MANUFACTURER  
Alpha  
CABLE NO.  
2413 or 5463  
A22503  
American  
Belden  
CONTROL SYSTEM  
8772  
The control system consists of a processor module  
(Fig. 71), sensors, and controlled devices. Available options  
include a processor option module (Fig. 71), relay modules  
(Fig. 72), and local interface device.  
Columbia  
02525  
When connecting the CCN communication bus to a sys-  
tem element, a color code system for the entire network is  
recommended to simplify installation and checkout. The fol-  
lowing color code is recommended:  
64  
Fig. 69 — CCN Communication Wiring  
All system software and operating intelligence is in the  
Relay (DSIO) Module (Fig. 72) — The DSIO mod-  
ule provides additional inputs and outputs to the PSIO mas-  
ter for electric heater and direct expansion coil staging. The  
DSIO module is factory installed. If only one DSIO module  
is used for electric heat or DX cooling, the DSIO address  
switches are factory-set at 19. If 2 DSIO modules are used  
for electric heat and DX cooling, the heat module is set to  
address 19 and the cooling module is set to address 49. See  
Table 1.  
The DSIO inputs on strip J3 are discrete (ON/OFF) in-  
puts. When 24 vac are applied across the 2 terminals, the  
corresponding channel reads one state. When no power is  
applied across the terminals, the channel reads the opposite  
state.  
processor (PSIO master) module, which controls the unit.  
This module monitors and controls conditions through input  
and output ports and through the option (PSIO slave) and  
relay (DSIO) modules.  
The machine operator communicates with the PSIO mas-  
ter through the local interface device (HSIO). Communica-  
tions between the PSIO and other modules is accomplished  
by a 3-wire sensor bus that runs in parallel between mod-  
ules. See Fig. 73.  
On the sensor bus terminal strips, terminal 1 of the PSIO  
module is connected to terminal 1 of each of the other mod-  
ules (see Fig. 73). Terminals 2 and 3 are connected in  
the same manner. If a terminal 2 wire is connected to  
terminal 1, the system does not work.  
IMPORTANT: The 24 vac inputs on J3 of the DSIO  
module are polarized, with one side tied to earth ground.  
The grounded side of the signal must be connected to  
the even-number pins.  
The PSIO master and slave and DSIO are all powered from  
a 21 vac power source connected to terminals 1 and 2 of the  
power input connector on each module. Refer to the 39L or  
39NX unit wiring diagram for transformer locations and  
wiring.  
Terminal strips J4 and J5 are internal relays whose coils  
are powered on and off by a signal from the microprocessor.  
The relays switch the circuit to which they are connected.  
Only Class II power should be applied to these connections.  
Processor (PSIO Master) and Option (PSIO Slave)  
Modules (Fig. 71) — The PSIO master module moni-  
tors and controls components such as the supply fan, cool-  
ing and heating coil valves, inlet guide vanes, and mixed-air  
dampers. The PSIO slave module provides additional inputs  
and outputs to the PSIO master for options such as return  
fan volume, humidifier, smoke, and air quality control. The  
processor and option modules are factory installed.  
Each PSIO input and output channel has 3 terminals;  
only 2 of the terminals are used. The unit application de-  
termines the terminal connections. Refer to the unit wiring  
diagram for terminal numbers.  
IMPORTANT: Use only the normally-open contacts  
on DSIO modules. These contacts have internal snub-  
bers that protect the control modules from destructive  
arcing produced by switching inductive loads. NEVER  
use the normally-closed contacts.  
The PSIO address switches are factory set at address  
01 (master) and 31 (slave). Use a local or remote HSIO or  
the CCN to change the unit address. Do NOT change the  
address switches on the PSIO modules.  
65  
LEGEND  
AHU  
CUST  
DSIO  
DX  
OAT  
PIC  
Air Handling Unit  
Condensing Unit Status  
Relay Module  
Direct Expansion  
Outdoor Air Thermostat  
Product Integrated Control  
Factory Wiring  
Field Wiring  
Fig. 70 — Outdoor Air Thermostat/DSIO Wiring  
66  
Local Interface Device (HSIO) (Fig. 74) — The  
HSIO consists of a keyboard with 6 function keys, 5 opera-  
tive keys, 10 numeric keys (0-9), and an alphanumeric  
8-character liquid crystal display (LCD). Key use is ex-  
plained in Table 10. Each function has one or more subfunc-  
tions as shown in Table 11. These functions are described in  
greater detail in the Control Operation section of this book.  
The HSIO can be factory-or field-installed, and can be re-  
motely mounted if necessary.  
Table 10 — Local Interface Device Key Usage  
FUNCTION  
USE  
KEYS  
Status — Display diagnostic codes and current  
operating information about the machine  
Quick Test — Check inputs and outputs for  
proper operation  
History — Check latest service dates and  
alarms in order of occurrence  
Service — Enter specific unit configuration  
information  
Set Point — Enter operating set points and  
day/time/date, holiday, and daylight savings  
time information  
Schedule — Enter occupied/unoccupied sched-  
ules for unit operation  
OPERATIVE  
USE  
KEYS  
Expand Display — Display a non-abbreviated  
expansion of the display  
Clear — Clear the screen of all displays  
Up Arrow — Return to previous display position  
Down Arrow — Advance to next display  
position  
Fig. 72 — Relay Module (DSIO)  
Enter data  
LID  
Local Interface Device  
Fig. 73 — Sensor Bus Wiring (Communications)  
Fig. 74 — Local Interface Device  
Fig. 71 — Processor Module (PSIO Master/Slave)  
67  
Table 11 — Functions and Subfunctions  
SUB-  
FUNCTION  
FUNCTION  
NUMBER  
Status  
History  
Schedule  
Service  
Set Point  
Test  
1
Current alarms  
Alarm history  
Occupied mode  
override sched 1  
Log on and  
Log off  
System set points  
Quick test of  
inputs  
2
Current operating  
modes  
Maintenance  
history  
Period 1  
Software  
version  
Demand limits  
Current time  
Quick test of  
outputs  
of schedule 1  
3
Current operating  
set points  
Period 2  
of schedule 1  
Factory  
configuration  
Quick test of  
electric heat  
4
System inputs  
Period 3  
English/metric  
system  
Daylight savings  
time configuration  
Quick test of  
DX cooling  
of schedule 1  
5
System outputs  
Period 4  
of schedule 1  
User  
configuration  
Holiday  
configuration  
Exit quick  
test  
6
Period 5  
of schedule 1  
Heating coil  
configuration  
7
Period 6  
of schedule 1  
Cooling coil  
configuration  
8
Period 7  
of schedule 1  
DX cooling  
configuration  
9
Period 8  
of schedule 1  
Inlet guide vanes  
configuration  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
Occupied mode  
override sched 2  
Mixed-air damper  
configuration  
Period 1  
of schedule 2  
Electric heat  
configuration  
Period 2  
of schedule 2  
Nighttime free  
cooling configuration  
Period 3  
of schedule 2  
Night purge  
configuration  
Period 4  
of schedule 2  
OAVP  
configuration  
Period 5  
of schedule 2  
Air quality  
configuration 1  
Period 6  
of schedule 2  
Air quality  
configuration 2  
Period 7  
of schedule 2  
Optimal start/stop  
configuration  
Period 8  
of schedule 2  
Space temperature  
reset configuration  
Loadshed  
configuration  
Fan tracking  
configuration  
Humidity  
configuration  
Alarms limits  
configuration  
Analog temperature  
configuration  
Discrete temperature  
configuration  
Service history  
configuration  
Service maintenance  
configuration  
Timed override  
history  
DX  
Direct Expansion  
68  
CONTROL OPERATION  
Accessing Functions and Subfunctions — See  
Display Functions  
Table 12. Refer also to Table 11, which shows the 6 func-  
tions (identified by name) and the subfunctions (identified  
by number). Table 13 shows the sequence of all the elements  
in a subfunction.  
SUMMARY DISPLAY — Whenever the keyboard has not  
been used for 10 minutes, the display automatically switches  
to an alternating summary display. This display has 3 parts  
(day/time, mode, and alarms), shown below, which alternate  
in continuously rotating sequence.  
Display  
Expansion  
TUE 12:45  
MODE 23  
TODAY IS TUE, TIME IS 12:45  
UNOCCUPIED HEATING  
2 ALARMS THERE ARE 2 ALARMS DETECTED  
Return to the previous display at any time by pressing  
.
Table 12 — Accessing Functions and Subfunctions  
OPERATION  
KEYBOARD DISPLAY  
ENTRY  
DESCRIPTION  
To access a function, press the subfunction number and the function name key.  
The display shows the subfunction group  
SETPOINT System set points  
To move to the other elements, scroll up or down using the arrow keys  
OHSP X  
OCSP X  
UHSP X  
UCSP X  
Occupied heating set point  
Occupied cooling set point  
Unoccupied heating set point  
Unoccupied cooling set point  
When the last element in a subfunction has been displayed, the first element  
is repeated  
To move to the next subfunction, it is not necessary to use the subfunction  
number. Pressing the function name key advances the display through all sub-  
functions within a function and then back to the first  
DEMAND  
TIME  
Demand limit set points  
Time of day and day of week  
display  
DAYLIGHT Daylight savings time  
HOLIDAY Holiday display  
SETPOINT System set points  
X ALARMS X alarms detected  
To move to another function, either depress the function name key for  
the desired function (display shows the first subfunction)  
or  
Access a particular subfunction by using the subfunction number and the func-  
tion name key  
SETPOINT Current operating set points  
69  
Table 13 — Keyboard Directory  
STATUS  
Display  
STATUS  
Keyboard Entry  
Description  
Keyboard Entry  
Display  
Description  
MODES  
Current operating modes  
Mode 1  
ALARMS  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
Current alarm display  
1st alarm  
MODE X  
MODE X  
Mode 2  
2nd alarm  
3rd alarm  
SETPOINT  
OHSP X  
OCSP X  
UHSP X  
UCSP X  
SPSP X  
SASP X  
CFSP X  
HUSP X  
AOSP X  
DOSP X  
Q1SP X  
Q2SP X  
OASP X  
Current operating set points  
Occupied heating set point  
Occupied cooling set point  
Unoccupied heating set point  
Unoccupied cooling set point  
Static pressure set point  
Supply air set point  
4th alarm  
5th alarm  
6th alarm  
7th alarm  
8th alarm  
9th alarm  
10th alarm  
11th alarm  
12th alarm  
13th alarm  
14th alarm  
15th alarm  
16th alarm  
17th alarm  
18th alarm  
19th alarm  
20th alarm  
21st alarm  
22nd alarm  
23rd alarm  
24th alarm  
25th alarm  
26th alarm  
27th alarm  
28th alarm  
29th alarm  
30th alarm  
31st alarm  
32nd alarm  
Delta CFM set point  
Humidity set point  
Analog temperature control set point  
Discrete temperature control set point  
Air quality 1 set point  
Air quality 2 set point  
Outdoor air velocity pressure  
set point  
70  
Table 13 — Keyboard Directory (cont)  
STATUS  
STATUS  
Keyboard Entry  
Display  
INPUTS  
SPT X  
SAT X  
RAT X  
OAT X  
OAT X  
Description  
Keyboard Entry  
Display  
IGV X  
MIXD X  
MIXD X  
HCV X  
HCV X  
CCV X  
CCV X  
SF X  
Description  
System inputs  
Inlet guide vanes forced  
(x = forced value)  
Space temperature  
Mixed air damper  
Supply air temperature  
Return air temperature  
Outside air temperature  
Mixed air damper forced  
(x = forced value)  
Heating coil valve  
Heating coil valve forced  
(x = forced value)  
Outside air temperature forced  
(x = forced value)  
Cooling coil valve  
SP X  
SFS X  
ENT X  
ENT X  
Static pressure  
Cooling coil valve forced  
(x = forced value)  
Supply fan status  
Enthalpy switch status  
Supply fan start/stop  
Supply fan start/stop forced  
(x = forced value)  
SF X  
Enthalpy switch status forced  
(x = forced value)  
HIR X  
HIR X  
Heat interlock relay  
RH X  
RH X  
Relative humidity  
Heat interlock relay forced  
(x = forced value)  
Relative humidity forced  
(x = forced value)  
EHS1 X  
EHS2 X  
EHS3 X  
EHS4 X  
EHS5 X  
EHS6 X  
EHS7 X  
Electric heat stage 1  
Electric heat stage 2  
Electric heat stage 3  
Electric heat stage 4  
Electric heat stage 5  
Electric heat stage 6  
Electric heat stage 7  
FRZ X  
MAT X  
Freezestat status  
Mixed air temperature  
Outside air relative humidity  
OARH X  
OARH X  
Outside air relative humidity forced  
(x = forced value)  
FLTS X  
FLTS X  
Filter status  
Filter status forced  
(x = forced value)  
TEMP X  
RVP X  
Temperature input  
Return velocity pressure  
Supply velocity pressure  
Duct high humidity  
Evacuation  
Electric heat stage 8  
(NOTE: Only the actual number of  
heater stages applicable to the unit  
are provided.)  
EHS8 X  
SVP X  
RFVC X  
RFVC X  
HUM1 X  
HUM1 X  
HUM2 X  
HUM2 X  
AOTC X  
AOTC X  
DOTC X  
DOTC X  
DTCC X  
DTCC X  
Return fan volume  
DHH X  
EVAC X  
PRES X  
PURG X  
FSD X  
Return fan volume forced  
(x = forced value)  
Pressurization  
Humidifier first stage  
Smoke purge  
Humidifier first stage forced  
(x = forced value)  
Fire shutdown  
Humidifier 2nd stage  
MTR X  
OAVP X  
OAVP X  
Meter  
Humidifier 2nd stage forced  
(x = forced value)  
Outdoor air velocity pressure  
Analog temperature  
Outdoor air velocity pressure  
(x = forced value)  
Analog temperature forced  
(x = forced value)  
AQ1 X  
AQ1 X  
Air quality 1  
Discrete temperature  
Air quality 1  
(x = forced value)  
Discrete temperature forced  
(x = forced value)  
AQ2 X  
AQ2 X  
Air quality 2  
Discrete time clock  
Air quality 2  
(x = forced value)  
Discrete time clock forced  
(x = forced value)  
CUST X  
CUST X  
Condensing unit status  
DXS1 X  
DXS2 X  
DXS3 X  
DXS4 X  
DXS5 X  
DXS6 X  
DXS7 X  
DXS8 X  
DX cooling stage 1  
DX cooling stage 2  
DX cooling stage 3  
DX cooling stage 4  
DX cooling stage 5  
DX cooling stage 6  
DX cooling stage 7  
DX cooling stage 8  
Condensing unit status  
(x = forced value)  
DXSD X  
DXSD X  
DX cooling shutdown  
DX cooling shutdown  
(x = forced value)  
OUTPUTS  
IGV X  
System outputs  
Inlet guide vanes  
DX  
Direct Expansion  
71  
Table 13 — Keyboard Directory (cont)  
SCHEDULE  
Display  
SERVICE CONFIGURATIONS  
Keyboard Entry  
Description  
Keyboard Entry  
Display  
Description  
OVRD X  
Number of hours to extend  
occupied mode of schedule 1  
LOG ON  
Enter password to log on  
LOGGEDON Log on okay  
PERIOD 1  
Define period 1 of time  
schedule 1  
When finished with configuration, log off as follows:  
Shows that configurations are  
OCC X  
UNO X  
MON X  
Start of occupied time  
LOGGEDON  
available  
Start of unoccupied time  
LOG OFF  
Log off okay; configurations again  
LOGD OFF  
Monday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
password protected  
TUE X  
WED X  
THU X  
FRI X  
Tuesday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
VERSION  
XXX-XX-X  
Software version  
Software version number  
Wednesday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
FACT CFG  
TYPE X  
Factory configuration  
Thursday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
Unit type (0 = CV, 1 = VAV)  
Cooling (0 = none, 1 = coil)  
Friday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
COOL X  
DXST X  
SAT X  
Saturday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
DX cooling stages 0-8  
(enter number)  
SUN X  
HOL X  
Sunday flag  
Heating (0 = none,  
1 = hot/steam,  
HEAT X  
EHST X  
Holiday flag  
2 = electric heat coil)  
Electric heat stages 0-8  
(enter number)  
Mixed air damper (0 = none,  
1 = yes, 2 = 2-position)  
MIXD X  
IAQT X  
MATP X  
BUS X  
Time periods 2-8 of schedule 1  
Indoor-air quality type  
(same elements as period 1, schedule 1)  
Mixed air temperature protection  
Bus number (factory default  
set = 0)  
Element address (factory set  
default = 1)  
ADR X  
PSW X  
OVRD X  
Number of hours to extend  
occupied mode of schedule 2  
Password XXXX  
PERIOD 1  
Define period 1 of time  
schedule 2  
English/metric system  
(0 = English, 1 = metric)  
UNITS X  
OCC X  
UNO X  
MON X  
Start of occupied time  
USER CFG User configuration  
Start of unoccupied time  
Nighttime free cooling  
NTEN X  
configuration  
Monday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
HUEN X  
OHEN X  
RSEN X  
DLEN X  
FTEN X  
OAEN X  
NPEN X  
AQEN X  
IAQP X  
Humidity configuration  
TUE X  
WED X  
THU X  
FRI X  
Tuesday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
Occupied heating configuration  
Space temperature reset  
configuration  
Wednesday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
Demand limiting configuration  
Fan tracking configuration  
Constant outside air  
Thursday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
Friday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
SAT X  
Saturday flag (x = entry code)  
(1 = yes, .0 or CLR = no)  
Night purge  
SUN X  
HOL X  
Sunday flag  
Indoor air quality  
Holiday flag  
Indoor air quality priority level  
Optimal start/stop configuration  
Timed override schedules  
Timed override values  
OSEN X  
TSCH X  
TOVR X  
Time periods 2-8 of schedule 2  
(same elements as period 1, schedule 2)  
HEATCOIL  
MPG X  
MIG X  
Configuration of heating coil  
Master proportional gain  
Master integral gain  
CV  
Constant Volume  
Direct Expansion  
Variable Air Volume  
DX  
MDG X  
SMG X  
SCV X  
Master derivative gain  
Submaster gain  
VAV  
Submaster center value  
Fan off value  
FOV X  
SMR X  
SMR X  
Submaster reference value  
Submaster reference value forced  
72  
Table 13 — Keyboard Directory (cont)  
SERVICE CONFIGURATIONS  
SERVICE CONFIGURATIONS  
Keyboard Entry  
Display  
Description  
Keyboard Entry  
Display  
Description  
Configuration of cooling  
(chilled water coil or DX)  
COOLCOIL  
MIXADMPR  
Configuration of mixed air damper  
MPG X  
MIG X  
MDG X  
SMG X  
SCV X  
HHL X  
SMR X  
SMR X  
Master proportional gain  
Master integral gain  
MPG X  
MIG X  
Master proportional gain  
Master integral gain  
Master derivative gain  
Submaster gain  
MDG X  
SMG X  
SCV X  
MDP X  
SMR X  
SMR X  
DPSP X  
DPSP X  
OAE X  
RAE X  
CNTRL X  
Master derivative gain  
Submaster gain  
Submaster center value  
High humidity limit  
Submaster center value  
Minimum damper position  
Submaster reference value  
Submaster reference value forced  
Damper set point  
Submaster reference value  
Submaster reference value forced  
DXCOOL  
SMG X  
SMG X  
MSR X  
Configure DX cooling  
Submaster gain  
Damper set point forced  
Outside air enthalpy  
Submaster gain forced  
Minimum submaster reference  
Stage 1 Time Guarddevice  
Stage 2 Time Guard  
Stage 3 Time Guard  
Stage 4 Time Guard  
Stage 5 Time Guard  
Stage 6 Time Guard  
Stage 7 Time Guard  
Stage 8 Time Guard  
Stage 1 logic type  
Return air enthalpy  
Damper controlled by  
DX1G X  
DX2G X  
DX3G X  
DX4G X  
DX5G X  
DX6G X  
DX7G X  
DX8G X  
DX1T X  
DX2T X  
DX3T X  
DX4T X  
DX5T X  
DX6T X  
DX7T X  
DX8T X  
ELECHEAT  
Configuration of electric heat  
MPG X  
MIG X  
Master proportional gain  
Master integral gain  
MDG X  
SMG X  
SMR X  
SMR X  
Master derivative gain  
Submaster gain  
Submaster reference value  
Submaster reference value forced  
Configuration of nighttime  
free cooling (NTFC)  
NTFC lockout temperature (minimum  
outside air temperature to operate  
NTFC)  
NTFC  
Stage 2 logic type  
NTLO X  
Stage 3 logic type  
Stage 4 logic type  
NPURGE  
Configuration of night purge  
Stage 5 logic type  
NPMN X  
NPDL X  
NPDH X  
MDP X  
Night purge duration  
Night purge low temperature  
damper position  
Night purge high temperature  
damper position  
Stage 6 logic type  
Stage 7 logic type  
Stage 8 logic type  
Minimum damper position  
INLET GV  
MPG X  
MIG X  
Configuration of inlet guide vanes  
Master proportional gain  
Master integral gain  
Configuration of constant  
outside air  
OAC  
MPG X  
MIG X  
Master proportional gain  
Master integral gain  
MDG X  
SMG X  
SCV X  
SMR X  
SMR X  
Master derivative gain  
MDG X  
SMG X  
SMG X  
OALV X  
OAHV X  
OALR X  
OAHR X  
PMF X  
MDP X  
SMR X  
SMR X  
Master derivative gain  
Submaster gain  
Submaster gain  
Submaster center value  
Submaster reference value  
Submaster reference value forced  
Submaster gain forced  
OAVP sensor low voltage point  
OAVP sensor high voltage point  
OAVP sensor low voltage reference  
OAVP sensor high voltage reference  
OAVP sensor probe multiplier factor  
Minimum damper position  
Submaster reference value  
Submaster reference value forced  
DX  
OAVP  
Direct Expansion  
Outside Air Velocity Pressure  
73  
Table 13 — Keyboard Directory (cont)  
SERVICE CONFIGURATIONS  
Display  
SERVICE CONFIGURATIONS  
Keyboard Entry  
Description  
Keyboard Entry  
Display  
Description  
Configuration of indoor air quality  
AIRQUAL1  
HUMIDITY Configuration of humidity  
and AQ sensor no. 1  
Master proportional gain  
Master integral gain  
MPG X  
MIG X  
Master proportional gain  
Master integral gain  
MPG X  
MIG X  
MDG X  
SMG X  
SCV X  
SMR X  
SMR X  
Master derivative gain  
Submaster gain  
XDP X  
Maximum damper position  
Air quality sensor 1 low voltage  
point  
Air quality sensor 1 high voltage  
point  
Air quality sensor 1 low voltage  
reference  
Air quality sensor 1 high voltage  
reference  
Q1LV X  
Q1HV X  
Q1LR X  
Q1HR X  
MDP X  
Submaster center value  
Submaster reference value  
Submaster reference value forced  
Minimum damper position  
ALRMLIMT Configuration of alarm limits  
Space temperature low alarm limit/  
SPLO X  
occupied  
Configuration of indoor air quality  
and AQ sensor no. 2  
AIRQUAL2  
Space temperature high alarm limit/  
SPHO X  
occupied  
MPG X  
MIG X  
Master proportional gain  
Space temperature low alarm limit/  
unoccupied  
Space temperature high alarm limit/  
unoccupied  
SPLU X  
Master integral gain  
SPHU X  
XDP X  
Maximum damper position  
Supply air temperature low alarm limit/  
SALO X  
occupied  
Q2LV X  
Q2HV X  
Q2LR X  
Q2HR X  
MDP X  
Air quality sensor 2 low voltage point  
Air quality sensor 2 high voltage point  
Air quality sensor 2 low voltage reference  
Air quality sensor 2 high voltage reference  
Minimum damper position  
Supply air temperature high alarm limit/  
SAHO X  
occupied  
Supply air temperature low alarm limit/  
unoccupied  
Supply air temperature high alarm limit/  
unoccupied  
SALU X  
SAHU X  
Return air temperature low alarm limit/  
RALO X  
occupied  
Return air temperature high alarm limit/  
RAHO X  
occupied  
Return air temperature low alarm limit/  
AOSS X  
BLDF X  
UOCF X  
SETB X  
OSMT X  
Configuration of optimal start/stop  
Building factor  
RALU X  
unoccupied  
Return air temperature high alarm limit/  
unoccupied  
Temperature input low alarm limit/  
occupied  
Temperature input high alarm limit/  
occupied  
Temperature input low alarm limit/  
unoccupied  
RAHU X  
24 hour occupied factor  
Set point bias  
TLO X  
THO X  
Maximum allowable stop time  
TLU X  
Temperature input high alarm limit/  
SPRESET  
RTIO X  
Configuration of space temperature reset  
Reset ratio X  
THU X  
unoccupied  
OATL X  
OATH X  
MATL X  
MATH X  
RHL X  
Outside air temperature low alarm limit  
Outside air temperature high alarm limit  
Mixed air temperature low alarm limit  
Mixed air temperature high alarm limit  
Relative humidity low alarm limit  
LIMT X  
Reset limit X  
LOADSHED Configuration of loadshed  
LSGP X Loadshed group number (1-16)  
FANTRACK Configuration of fan tracking  
RHH X  
ORHL X  
ORHH X  
SPL X  
Relative humidity high alarm limit  
SVUL X  
RVUL X  
SDAR X  
RDAR X  
MPG X  
MIG X  
Supply velocity upper limit  
Return velocity upper limit  
Supply duct area  
Outside air relative humidity low alarm  
limit  
Outside air relative humidity high alarm  
limit  
Static pressure low alarm limit  
Return duct area  
SPH X  
Static pressure high alarm limit  
Master proportional gain  
Master integral gain  
SVPL X  
SVPH X  
RVPL X  
RVPH X  
CFML X  
CFMH X  
Q1H X  
Supply velocity pressure low alarm limit  
Supply velocity pressure high alarm limit  
Return velocity pressure low alarm limit  
Return velocity pressure high alarm limit  
Delta CFM x 100 low alarm limit  
MDG X  
SMG X  
SCV X  
Master derivative gain  
Submaster gain  
Submaster center value  
Submaster reference value  
Submaster reference value forced  
SMR X  
SMR X  
Delta CFM x 100 high alarm limit  
Air quality sensor 1 high alarm limit  
Air quality sensor 2 high alarm limit  
Q2H X  
74  
Table 13 — Keyboard Directory (cont)  
SERVICE CONFIGURATIONS  
Display  
SET POINT  
Keyboard Entry  
Description  
Keyboard Entry  
Display  
SETPOINT  
OHSP X  
OCSP X  
UHSP X  
UCSP X  
SPSP X  
SASP X  
CFSP X  
HUSP X  
AOSP X  
DOSP X  
Q1SP X  
Q2SP X  
OVSP X  
Description  
Configuration of analog temperature/  
preheat coil control  
System set points  
AO CTRL  
Occupied heating set point  
Occupied cooling set point  
Unoccupied heating set point  
Unoccupied cooling set point  
Static pressure set point  
Supply air set point  
MPG X  
MIG X  
MDG X  
SMG X  
SCV X  
FOV X  
SEN X  
SMR X  
SMR X  
Master proportional gain  
Master integral gain  
Master derivative gain  
Submaster gain  
Submaster center value  
Fan off value  
Delta CFM set point  
Controlling temperature sensor  
Submaster reference value  
Submaster reference value forced  
Humidity set point  
Analog temperature control set point  
Discrete temperature control set point  
Air quality 1 set point  
DO CTRL  
SEN X  
Configuration of discrete output control  
Controlling temperature sensor  
Discrete output logic type  
Hysteresis  
Air quality 2 set point  
Outside air velocity pressure set point  
TYP X  
HYS X  
DEMAND  
DL1 X  
Demand limit set points  
Demand limit set point 1  
Demand limit set point 2  
SERVHIST  
SDAY X  
STX  
Service history  
DL2 X  
Number of starts in the last 24 hours  
Total number of starts  
TIME  
Configuration of current time and date  
Current day of the week and time  
Current date  
DAY.HH.MM  
MM.DD.YY  
FH X  
Total number of fan run hours  
DOW HH:MM Day of week and time of the last Start  
DOW HH:MM Day of week and time of the last Stop  
DAYLIGHT  
ENM X  
END X  
ENT X  
LVM X  
LVD X  
Configuration of daylight savings time  
Daylight savings time starts—month  
Daylight savings time starts—day  
Daylight savings time starts—time  
Daylight savings time ends—month  
Daylight savings time ends—day  
Daylight savings time ends—time  
Configuration of service/maintenance  
SRV/MTN  
alarms  
Service/maintenance alarm limit  
(hours x 1000)  
SMAL X  
Service/maintenance elapsed hours  
(hours x 1000)  
SMEH X  
OVRDHIST  
OHR X  
History of timed overrides  
Hours of timed overrides  
LVT X  
HOLIDAY  
Configuration of holidays  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
MM.DD.DUR  
Holiday month, day & duration  
(days long)  
Holiday month, day & duration  
(days long)  
75  
Table 13 — Keyboard Directory (cont)  
QUICK TEST  
Display  
QUICK TEST  
Display  
Keyboard Entry  
Description  
Keyboard Entry  
Description  
INPUTS  
SAT X  
Factory/field test of inputs  
OUTPUTS  
HCV X  
Factory/field test of outputs  
Supply air temperature  
Outside air temperature  
Space temperature  
Return air temperature  
Enthalpy switch status  
Airflow switch status  
Freezestat  
Entering heating coil valve test  
Testing heating coil valve  
Entering cooling coil valve test  
Testing cooling coil valve  
OAT X  
SPT X  
RAT X  
HCV TEST  
CCV X  
CCV TEST  
MIXD X  
Entering mixed air damper test  
Testing mixed air dampers  
Entering inlet guide vanes test  
Testing inlet guide vanes  
ENT X  
SFS X  
FRZ X  
SP X  
MIXD TEST  
IGV X  
IGV TEST  
SF X  
Static pressure  
Entering supply fan test  
RH X  
Return air relative humidity  
Mixed air temperature  
Outside air relative humidity  
Filter status  
FAN TEST  
HIR X  
Testing supply fan  
MAT X  
OARM X  
FLTS X  
TEMP X  
RVP X  
SVP X  
DHH X  
EVAC X  
PRES X  
PURG X  
FSD X  
MTR X  
OAVP X  
AQ1 X  
AQ2 X  
CUST X  
DXSD X  
Entering heat interlock relay test  
Testing heating interlock relay  
Entering return fan volume test  
Testing return fan volume  
Entering humidifer stage 1 test  
Testing humidifer stage 1  
Entering humidifier stage 2 test  
Testing humidifier stage 2  
HIR TEST  
RFVC X  
Temperature input  
Return velocity pressure  
Supply velocity pressure  
Duct high humidity  
Evacuation  
RFVCTEST  
HUM1 X  
HUM1TEST  
HUM2 X  
HUM2TEST  
AOTC X  
Pressurization  
Entering analog temperature control  
output test  
Testing analog temperature control  
output  
Entering discrete temperature control  
output test  
Testing discrete temperature control  
output  
Entering discrete time clock control  
output test  
Testing discrete time clock control  
output  
Smoke purge  
AOTCTEST  
DOTC X  
Fire shutdown  
Wattmeter  
DOTCTEST  
DTCC X  
Outside air velocity pressure  
Air quality 1  
DTCCTEST  
Air quality 2  
Condensing unit status  
DX cooling shutdown  
DX  
Direct Expansion  
76  
Table 13 — Keyboard Directory (cont)  
QUICK TEST  
Display  
HISTORY  
Display  
Keyboard Entry  
Description  
Keyboard Entry  
Description  
ELE HEAT  
EHS1 X  
Factory/field test of electric heat  
ALARMHST  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
ALARM X  
Alarm history  
Latest alarm  
Stage 1 test  
STG1 TST  
EHS2 X  
Testing of electric heat stage 1  
Stage 2 test  
Previous alarm  
Previous alarm  
Previous alarm  
Previous alarm  
Previous alarm  
Previous alarm  
Previous alarm  
Previous alarm  
STG2 TST  
EHS3 X  
Testing of electric heat stage 2  
Stage 3 test  
STG3 TST  
EHS4 X  
Testing of electric heat stage 3  
Stage 4 test  
STG4 TST  
EHS5 X  
Testing of electric heat stage 4  
Stage 5 test  
STG5 TST  
EHS6 X  
Testing of electric heat stage 5  
Stage 6 test  
MTMN/HIS  
MM.DD.YY  
Maintenance history  
Latest service date  
STG6 TST  
EHS7 X  
Testing of electric heat stage 6  
Stage 7 test  
STG7 TST  
EHS8 X  
Testing of electric heat stage 7  
Stage 8 test  
STG8 TST  
Testing of electric heat stage 8  
DXCOOL  
DXS1 X  
Factory/field test of DX cooling  
Stage 1 test  
STG1TEST  
DXS2 X  
Testing DX cooling stage 1  
Stage 2 test  
STG2TEST  
DXS 3 X  
Testing DX cooling stage 2  
Stage 3 test  
STG3TEST  
DXS4 X  
Testing DX cooling stage 3  
Stage 4 test  
STG4TEST  
DXS5 X  
Testing DX cooling stage 4  
Stage 5 test  
STG5TEST  
DXS6 X  
Testing DX cooling stage 5  
Stage 6 test  
STG6TEST  
DXS7 X  
Testing DX cooling stage 6  
Stage 7 test  
STG7TEST  
DXS8 X  
Testing DX cooling stage 7  
Stage 8 test  
STG8TEST  
Testing DX cooling stage 8  
EXIT TEST  
TST CMPL  
Exit quick test  
Test completed  
DX  
Direct Expansion  
77  
STATUS FUNCTION — The status function shows the cur-  
rent status of alarm (diagnostic) codes, operating modes, set  
points, all measured system temperatures, output values, and  
input values. These subfunctions are defined on  
pages 78-80. Refer to Table 11 for additional information.  
The modes are explained below:  
Temperature Reset (21) — Indicates that the unit is using  
temperature reset to adjust the supply-air set point. The set  
point is modified based on space temperature (VAV units  
only). Unit must be configured for space temperature  
(Alarms) — Alarms are messages that one or more  
reset (  
). (This mode is enabled by  
.)  
faults have been detected. Each fault is assigned a code num-  
ber which is reported with the alarm. (See Table 14 for  
code definitions.) The codes indicate failures that cause the  
unit to shut down, terminate an option (such as reset), or  
result in the use of a default value as the set point.  
Demand Limit (22) — On CV (constant volume) units, this  
mode indicates that the fan is being held off by the De-  
mand Limit option. On VAV units, it indicates that the max-  
imum IGV position is being limited by the Demand Limit  
option. Units must be configured for demand limiting  
Up to 32 alarm codes can be stored at once. To view  
(
). This mode is enabled by  
, and is only  
them in numerical sequence, press  
alarm display and then press to move to the individual  
alarm displays. Press after a code has been displayed  
and the meaning of the code will scroll across the screen.  
See Example 1.  
If an input or output point which has generated an alarm  
resets (returns to a range within its limits), the alarm code is  
deleted from the list.  
to enter the  
available on units connected to the Carrier Comfort  
Network (CCN).  
Unoccupied Heating (23) — Indicates that the space tem-  
perature is below the Unoccupied Heating set point and the  
unit is on. When the space temperature rises above the set  
point the unit is turned off.  
Unoccupied Cooling (24) — Indicates that the space tem-  
perature is above the Unoccupied Cooling set point and the  
unit is on. When the space temperature falls below the set  
point the unit is turned off.  
Optimal Start (26) — Indicates that the unit is operating  
in the Optimal Start mode and is trying to achieve the  
Occupied set point. On VAV units this is referred to as morn-  
ing warm-up. Unit must be configured for optimal start  
A historical sequence of the last 9 alarms can be found  
using the  
key. See Display Functions, History Func-  
tion section for more details.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
(Modes) — The operating mode codes are dis-  
(
). This mode is enabled by  
.)  
played to indicate the current operating status of the unit.  
(See Table 14)  
Unoccupied Mode (27) — Indicates that the unit is in the  
Unoccupied mode as determined by its time schedule. In this  
mode the unit is turned off.  
Optimal Stop (29) — Indicates that the unit is being con-  
trolled to its expanded Occupied set points. The space tem-  
perature is allowed to drift to its expanded Occupied set points  
during the last portion of the Occupied period.  
To enter the MODES subfunction, press  
and use  
the key to determine if more than one mode applies.  
See Example 2 to read current mode with expansion.  
Example 1 — Reading Alarm Codes  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
Unit must be configured for Optimal Start (  
).  
Keyboard has not been used for  
at least 10 minutes; alternating  
summary display appears on  
screen  
Optimal Stop mode is only applicable to CV units.  
Occupied Heating (30) — Indicates that the unit is in the  
Heating mode to satisfy its Occupied Heating set point.  
TUE 12:45  
MODE 23  
3 ALARMS  
Units must be configured for Occupied Heating  
3 ALARMS  
ALARM 71  
3 alarms detected  
(
).  
First alarm code  
Occupied Heating is available on VAV units only.  
SPACE  
Explanation of alarm code  
TEMPERATURE  
Example 2 — Reading Current Operating Modes  
LOW LIMIT  
KEYBOARD  
ENTRY  
DISPLAY  
ALARM 76  
Second alarm code  
COMMENTS  
RESPONSE  
RETURN AIR  
TEMPERATURE  
HIGH LIMIT  
TUE 12:45  
MODE 31  
Keyboard has not been  
used for at least 10 min-  
utes; alternating summary  
display appears on screen.  
Explanation of alarm code  
ALARM 83  
Third alarm code  
Modes subfunction of  
status function  
MODE  
RELATIVE  
HUMIDITY  
LOW LIMIT  
Explanation of alarm code  
MODE 31  
Mode 31 is in effect  
OCCUPIED COOLING Explanation of code 31  
MODE 22  
Mode 22 is in effect  
DEMAND LIMIT  
Explanation of code 22  
NOTE: The first mode is the primary operating mode. The second  
mode is the secondary operating mode, if applicable.  
78  
Occupied Cooling (31) — Indicates that the unit is in the  
Table 14 — Display Codes  
Cooling mode to satisfy its Occupied Cooling set point.  
FORCE STATES  
Description  
Occupied Fan Only (32) — Indicates that the unit is main-  
taining set point by using a mixture of outside and return air  
only. No mechanical heating or cooling is being used.  
Nighttime Free Cooling (33) — Indicates that the supply fan  
is on and using outside air to precool the space served by the  
unit. Unit must be configured for nighttime free cool-  
Display  
1
2
3
4
5
6
7
8
Fire mode force  
Internal safety force  
Quick Test/Service tool force  
HSIO/Building Supervisor force  
Remote Building Supervisor force  
Loadshed minimum offtime force  
Data transfer force  
BEST (Building Environmental Systems  
Translator) force  
Temperature override force  
Loadshed force  
ing (  
). (This mode is enabled by  
.)  
Smoke Pressurization (34) — Indicates that the unit is in the  
Pressurization mode. This mode is issued from the fire  
system panel. Refer to Table 15 for the state of the items  
controlled.  
9
10  
OPERATING MODES  
Description  
Display  
Smoke Evacuation (35) — Indicates that the unit is in the  
Smoke Evacuation mode. This mode is issued from the  
system panel. Refer to Table 15 for the state of the items  
controlled.  
Smoke Purge (36) — Indicates that the unit is in the Smoke  
Purge mode. This mode is issued from the fire system panel.  
Refer to Table 15 for the state of the items controlled.  
Fire Shutdown (37) — Indicates that the unit is in the Fire  
Shutdown mode. This mode is issued from the fire system  
panel or local smoke detector. Refer to Table 15 for the state  
of the items controlled.  
Quick Test (38) — Indicates that the unit is in the Quick Test  
mode. It allows the user to test all inputs and outputs con-  
nected to the PIC controller. All control routines are deac-  
tivated when the unit is in this mode. This mode can only be  
initiated manually when the supply fan status is OFF. (HOA  
switch is in OFF position.) In order to reactivate all  
21  
22  
23  
24  
26  
27  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
Temperature Reset in effect  
Demand Limit in effect  
Unoccupied Heating mode  
Unoccupied Cooling mode  
Optimal Start mode  
Unoccupied mode  
Optimal Stop mode  
Occupied Heating mode  
Occupied Cooling mode  
Occupied Fan Only mode  
Nighttime Free Cooling mode  
Pressurization mode  
Evacuation mode  
Smoke Purge mode  
Fire Shutdown mode  
Quick Test mode  
Timed Override mode  
ALARMS  
Display  
Description  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
91  
92  
93  
94  
95  
96  
97  
98  
Air quality 1 high limit  
Air quality 2 high limit  
Air quality/constant outside air suspended  
(Not used)  
the configured control routines, press  
.
and then press  
DX cooling shutdown  
Pressurization  
Timed Override (39) — Indicates that the unit operation has  
been extended by the user. Unit must be configured for  
Evacuation  
Smoke purge  
Fire shutdown  
Timed Override schedule and timed override hours (  
).  
Service/maintenance required  
Linkage failure  
Space temperature low limit  
Space temperature high limit  
Supply-air temperature low limit  
Supply-air temperature high limit  
Return-air temperature low limit  
Return-air temperature high limit  
Mixed-air temperature low limit  
Mixed-air temperature high limit  
Outside-air temperature low limit  
Outside-air temperature high limit  
Static pressure low limit  
Static pressure high limit  
Relative humidity low limit  
Relative humidity high limit  
Fan status  
Freezestat  
Analog temperature control sensor low limit  
Analog temperature control sensor high limit  
Outside-air relative humidity low limit  
Outside-air relative humidity high limit  
Supply velocity pressure low limit  
Supply velocity pressure high limit  
Return velocity pressure low limit  
Return velocity pressure high limit  
Delta CCFM low limit  
Delta CCFM high limit  
Filter status  
Duct high humidity  
CCFM  
Cfm x 100  
79  
Table 15 — State of Items Controlled  
MODE  
Pressurization  
Purge  
(DISPLAY RETURN SUPPLY OUTDOOR- RETURN- EXHAUST SUPPLY FAN RETURN  
HEAT  
ELECTRIC  
CODE)  
FAN  
FAN  
AIR  
AIR  
DAMPER INLET GUIDE FAN IGV INTERLOCK HEAT ALL  
DAMPER DAMPER  
VANES (IGV)  
RELAY  
STAGES  
(34)  
Off  
On  
Open  
Open  
Close  
Close  
Close  
Open  
Open to  
Static Pressure  
Set Point  
Close  
On  
Off  
(36)  
On  
On  
Open to  
Open to  
On  
Off  
Static Pressure л cfm  
Set point  
Evacuation  
(35)  
(37)  
On  
Off  
Off  
Off  
Close  
Close  
Close  
Open  
Open  
Close  
Close  
Close  
Open  
Close  
Off  
Off  
Off  
Off  
Fire Shutdown  
(Set point) — This subfunction displays the current  
operating system set points.  
To view set points, depress  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
(Outputs) — The output subfunction displays or  
, then use the  
key  
forces the output value percentage of the inlet guide vanes,  
mixed air damper and heating and cooling valves. It also  
displays or forces the ON/OFF status of the supply fan and  
heat interlock relay, displays the status of electric heat stages,  
and displays optional output status for return fan volume con-  
trol, analog output temperature control, discrete output tem-  
perature control, discrete output time clock, and humidifier  
stages.  
to display the occupied heat set point. Continue to depress  
to display all the various system set points. Table 13  
shows the order of the various set points.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
(Inputs) — The inputs subfunction displays the read-  
To read a system output value, enter  
, then scroll  
ings at the various temperature sensors, fan status, static pres-  
sure sensors, enthalpy switch, and freezestat. It also allows  
the outside-air temperature sensor, enthalpy switch, return-  
air relative humidity sensor, outside-air relative hu-  
midity sensor, and filter status to be forced to a user deter-  
mined value or status. The forced value overrides the value  
that the control system actually reads. This permits opera-  
tion in the event of a faulty sensor.  
to the desired output using the key. To force a system  
output value, see Example 4. Table 13 shows the order of  
the output values.  
Example 4 — Forcing An Output Value  
KEYBOARD  
ENTRY  
DISPLAY  
COMMENTS  
System Outputs  
RESPONSE  
To read a sensor, enter  
, then scroll to the de-  
key. To force an input,  
OUTPUTS  
sired sensor reading using the  
Scroll past:  
see Example 3. Table 13 shows the order of the readouts.  
IGV X  
Inlet guide vanes  
Example 3 — Forcing An Input Value  
MIXD X  
HCV X  
CCV X  
SF OFF  
Mixed air damper  
Heating coil valve  
Cooling coil valve  
Supply fan off  
KEYBOARD  
ENTRY  
DISPLAY  
COMMENTS  
System inputs  
RESPONSE  
INPUTS  
Scroll past:  
SPT X  
SAT X  
RT X  
Space temperature  
Supply fan forced ON.  
NOTE: Supply fan forced  
value toggles between value  
(SF ON) and word FORCED  
SF ON/FORCED  
SF OFF  
Supply air temperature  
Return air temperature  
Mixed air temperature  
Outside air temperature  
Supply fan forced value re-  
moved. Display no longer flashes  
MAT X  
OAT 60  
HISTORY FUNCTION  
— Displays the 9 latest alarms generated by the  
Outside air temperature value  
forced to 80. NOTE: Forced  
value toggles between value  
and word forced  
unit in the order of their occurrence. If 9 alarms are dis-  
played, the occurrence of a 10th alarm shifts the first alarm  
off the display.  
OAT 80/FORCED  
OAT 60  
8
0
Outside air temperature  
forced value removed.  
Display no longer flashes  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
80  
Example 5 — Using Quick Test  
— Displays the latest service date on the local in-  
KEYBOARD DISPLAY  
terface device. The last 2 service dates are displayed at the  
Building Supervisor.  
COMMENTS  
ENTRY  
RESPONSE  
Factory test of electric heat  
subfunction of test function  
ELEC HT  
TEST FUNCTION — The test function operates the Quick  
Test diagnostic program.  
EHS1  
Stage 1 test  
— Displays the status of all inputs.  
STG1 TST Pressing ENTR starts the fan test.  
Fan automatically starts. There is an  
11-second delay while the inlet  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Tests the outputs.  
guide vanes open and the heat stage  
is enabled. When the electric heat  
stage should be running, the display  
shows EHS ON. Test remains on  
until another key is pressed  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Tests the electric heaters. Unit must be config-  
EHS2  
Pressing the down arrow key  
advances the system to stage 2 test.  
Any stage may be selected. Press  
ured for electric heat to access this subfunction. See  
Example 5.  
the key until the desired stage is  
displayed, then press ENTR to start  
the test  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Tests the stages of direct expansion (DX) cool-  
EXIT TST  
If no other test is desired, exit Quick  
Test. Fan shuts off, last electric heat  
stage shuts off, and IGVs close  
Test is completed. Unit resumes  
automatic control  
ing. Unit must be configured for DX cooling to access this  
subfunction.  
TST CMPL  
Programming Functions  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Takes the unit out of Quick Test.  
SERVICE FUNCTION — The service function allows  
the operator to verify or change factory and field configu-  
rations. The service subfunctions are listed below. (See  
Table 13 for details.) Refer to Table 16 for configuration value  
ranges and defaults.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
NOTE: The unit must not be operating during the Quick Test  
function. Set HOA switch to OFF and follow the test pro-  
cedure. Set HOA switch to AUTO only as required during  
testing.  
— Use this subfunction to log on before perform-  
ing any subfunction in Factory Configurations (  
and to log off after completing service subfunctions. See  
Example 6.  
),  
To reach a particular test, enter its subfunction number  
and then scroll to the desired test by pressing  
. A test  
Example 6 — Logging On and Logging Off  
Service Function  
can be terminated by pressing ; pressing  
has started terminates the current test and advances the sys-  
tem to the next test. Once in the next step, you may start  
after a test  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
the test by pressing  
back up by pressing  
Quick Test by pressing  
, advance past it by pressing  
. When testing is complete, exit the  
and then ; this MUST  
, or  
TO LOG ON:  
Ready for password to be  
entered  
LOG ON  
Operator can now use  
service functions  
LOGGEDON  
be done to restore the unit software to automatic control.  
If the keyboard is not used for 10 minutes, the display  
TO LOG OFF:  
LOG OFF  
Ready for operator to log off  
returns to the rotating default display. Press  
to exit Quick Test and then press to restart the test  
procedure.  
and  
Logged off — password  
protection enabled  
LOGD OFF  
81  
Table 16 — Service Configuration Ranges and Defaults  
SERVICE  
SUBFUNCTION  
NUMBER  
FACTORY  
DEFAULT  
VALUE  
CONFIGURATION VALUE  
RANGE  
Unit Type (0 = CV, 1 = VAV)  
0/1  
0
1
2
Cooling Type (0 = none, 1 = chilled water coil, 2 = DX)  
DX Cooling Stages  
0 to 2  
0 to 8  
Heating Type (0 = none, 1 = hot water/steam coil,  
2 = electric heater)  
0 to 2  
0 to 8  
0 to 2  
1
0
1
Electric Heater Stages  
3
4
Mixed Air Dampers (0 = none, 1 = analog,  
2 = 2-position)  
Indoor-Air Quality Type (1 = single gas, 2 = differential/2 gases)  
Mixed-Air Temperature Protection  
Bus Number  
1/2  
1
Yes/No  
0 to 239  
0 to 239  
0 to 9999  
Yes  
0
Element Address  
Password  
1
1111  
English/Metric System (0 = English, 1 = Metric)  
0/1  
0
Nighttime Free Cooling  
Enabled/Disabled  
0 to 2  
Disabled  
0
Humidity Control (0 = none, 1 = analog, 2 = discrete)  
Occupied Heating  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
1 to 3  
Disabled  
Disabled  
Disabled  
Disabled  
Disabled  
Disabled  
Disabled  
2
Space Temperature Reset  
Demand Limit  
Fan Tracking  
Constant Outside Air  
5
Night Purge  
Indoor Air Quality  
Indoor Air Quality Priority Level (high = 1, low = 2, none = 3)  
Adaptive Optimal Start/Stop  
Timed Override Schedules  
(1 = Time schedule no. 1, 2 = Time schedule no. 2, 3 = Both)  
Timed Override Hours  
Enabled/Disabled  
1 to 3  
Disabled  
1
0 to 4  
0
Heating Coil Master Proportional Gain  
Heating Coil Master Integral Gain  
Heating Coil Master Derivative Gain  
Heating Coil Submaster Gain  
0 to 20.0  
0 to 2.0  
8.0  
0.3  
0.0  
−7.5  
50  
0 to 20.0  
−20.0 to 20.0  
0 to 100  
6
7
Heating Coil Submaster Center Value (%)  
Heating Coil Fan ‘‘Off’’ Value (F)  
35 to 65  
40  
Cooling Master Proportional Gain  
Cooling Master Integral Gain  
0 to 20.0  
0 to 2.0  
0 to 20.0  
−20.0 to 20.0  
0 to 100  
0 to 99  
8.0  
0.3  
0.0  
−7.5  
80  
Cooling Master Derivative Gain  
Cooling Coil Submaster Gain  
Cooling Coil Submaster Center Value (%)  
Cooling High Humidity Limit (%)  
99  
DX Cooling Submaster Gain  
2.0 to 25.0  
0 to 60  
*
DX Cooling Minimum Submaster Reference  
40  
DX Cooling Stage 1 Time GuardDevice (0 = disabled,  
1 = enabled)  
Enabled/Disabled  
Enabled  
DX Cooling Stage 2 Time Guard (0 = disabled, 1 = enabled)  
DX Cooling Stage 3 Time Guard (0 = disabled, 1 = enabled)  
DX Cooling Stage 4 Time Guard (0 = disabled, 1 = enabled)  
DX Cooling Stage 5 Time Guard (0 = disabled, 1 = enabled)  
DX Cooling Stage 6 Time Guard (0 = disabled, 1 = enabled)  
DX Cooling Stage 7 Time Guard (0 = disabled, 1 = enabled)  
DX Cooling Stage 8 Time Guard (0 = disabled, 1 = enabled)  
DX Cooling Stage 1 Logic Type (0 = normal, 1 = inverted)  
DX Cooling Stage 2 Logic Type (0 = normal, 1 = inverted)  
DX Cooling Stage 3 Logic Type (0 = normal, 1 = inverted)  
DX Cooling Stage 4 Logic Type (0 = normal, 1 = inverted)  
DX Cooling Stage 5 Logic Type (0 = normal, 1 = inverted)  
DX Cooling Stage 6 Logic Type (0 = normal, 1 = inverted)  
DX Cooling Stage 7 Logic Type (0 = normal, 1 = inverted)  
DX Cooling Stage 8 Logic Type (0 = normal, 1 = inverted)  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
Enabled/Disabled  
Normal/Inverted  
Normal/Inverted  
Normal/Inverted  
Normal/Inverted  
Normal/Inverted  
Normal/Inverted  
Normal/Inverted  
Normal/Inverted  
Enabled  
Enabled  
Enabled  
Enabled  
Enabled  
Enabled  
Enabled  
Normal  
Normal  
Normal  
Normal  
Normal  
Normal  
Normal  
Normal  
8
Inlet Guide Vanes Master Proportional Gain  
Inlet Guide Vanes Master Integral Gain  
Inlet Guide Vanes Master Derivative Gain  
Inlet Guide Vanes Submaster Gain  
0 to 5.0  
0.5  
0.3  
0.0  
5.0  
50  
0 to 2.0  
9
0 to 5.0  
−10.0 to 10.0  
0 to 100  
Inlet Guide Vanes Submaster Center Value (%)  
Mixed-Air Damper Master Proportional Gain  
Mixed-Air Damper Master Integral Gain  
Mixed-Air Damper Master Derivative Gain  
Mixed-Air Damper Submaster Gain  
0 to 20.0  
0 to 2.0  
8.0  
0.3  
0.0  
−7.5  
50  
0 to 20.0  
−20.0 to 20.0  
0 to 100  
10  
11  
Mixed-Air Damper Submaster Center Value (%)  
Mixed-Air Damper Minimum Position (%)  
0 to 100  
10  
Electric Heat Master Proportional Gain  
Electric Heat Master Integral Gain  
Electric Heat Master Derivative Gain  
Electric Heat Submaster Gain  
0 to 20.0  
0 to 2.0  
0 to 20.0  
0 to 15.0  
8.0  
0.3  
0.0  
5.0  
12  
NTFC Lock Out Temperature (F)  
40 to 70  
50  
LEGEND  
CV  
Constant Volume  
DX  
Direct Expansion  
NTFC  
VAV  
Nighttime Free Cooling  
Variable Air Volume  
*Value varies and is automatically calculated by the control. Override this feature by forcing the value.  
82  
Table 16 — Service Configuration Ranges and Defaults (cont)  
SERVICE SUBFUNCTION  
NUMBER  
FACTORY DEFAULT  
VALUE  
CONFIGURATION VALUE  
RANGE  
Night Purge Duration (minutes)  
Night Purge Low Temperature Damper Position (% output)  
Night Purge High Temperature Damper Position (% output)  
5 to 240  
0 to 100  
0 to 100  
15  
10  
35  
13  
Constant Outside Air Master Proportional Gain  
Constant Outside Air Master Integral Gain  
Constant Outside Air Master Derivative Gain  
Constant Outside Air Submaster Gain  
OAVP Sensor Low Voltage Point  
0.0 to 5.0  
0.0 to 5.0  
0.0 to 5.0  
60 to 600  
0 to 2  
0.3  
1.0  
0.0  
*
14  
2
OAVP Sensor High Voltage Point  
5 to 10  
10  
OAVP Sensor Low Voltage Reference  
OAVP Sensor High Voltage Reference  
OAVP Sensor Probe Multiplier Factor  
0.0 to 2.0  
0.01 to 5.00  
0.100 to 9.999  
0.0  
0.05  
1.564  
Air Quality Sensor 1 Master Proportional Gain  
Air Quality Sensor 1 Master Integral Gain  
Air Quality Sensor 1 Maximum Damper Position (%)  
Air Quality Sensor 1 Low Voltage Point  
0.01 to 1.00  
0.01 to 1.00  
0 to 100  
0.10  
0.03  
50  
15  
16  
0 to 2  
2
Air Quality Sensor 1 High Voltage Point  
5 to 10  
0 to 2000  
0 to 2000  
10  
Air Quality Sensor 1 Low Voltage Reference  
Air Quality Sensor 1 High Voltage Reference  
0
2000  
Air Quality Sensor 2 Master Proportional Gain  
Air Quality Sensor 2 Master Integral Gain  
Air Quality Sensor 2 Maximum Damper Position (%)  
Air Quality Sensor 2 Low Voltage Point  
Air Quality Sensor 2 High Voltage Point  
Air Quality Sensor 2 Low Voltage Reference  
Air Quality Sensor 2 High Voltage Reference  
0.01 to 1.00  
0.01 to 1.00  
0 to 100  
0.10  
0.03  
50  
0 to 2  
2
5 to 10  
10  
0 to 2000  
0 to 2000  
0
2000  
Building Factor (%)  
1 to 100  
0 to 99  
0 to 10  
0 to 120  
10  
15  
2
24 hour Unoccupied Factor  
Set Point Bias (F)  
17  
18  
Maximum Allowable Stop Time  
60  
Reset Ratio  
Reset Limit  
0 to 10  
0 to 20  
3
10  
Supply Velocity Upper Limit (in. wg)  
Return Velocity Upper Limit (in. wg)  
Supply Duct Area  
0 to 3.0  
2.0  
2.0  
0
0 to 3.0  
0 to 50  
0 to 50  
Return Duct Area  
0
20  
21  
Fan Tracking Master Proportional Gain  
Fan Tracking Master Integral Gain  
Fan Tracking Master Derivative Gain  
Fan Tracking Submaster Gain  
Fan Tracking Submaster Center Value (%)  
0.0 to 2.0  
0.0 to 2.0  
0.0 to 5.0  
−20.0 to 20.0  
0 to 100  
0.5  
0.5  
0.0  
10.0  
50  
Humidity Master Proportional Gain  
Humidity Master Integral Gain  
Humidity Master Derivative Gain  
Humidity Submaster Gain  
0.0 to 10.0  
0.0 to 2.0  
0.0 to 10.0  
−20.0 to 20.0  
0 to 100  
2.0  
0.3  
0.0  
7.5  
50  
Humidity Submaster Center Value (%)  
Space Temperature Low Alarm Limit — Occupied (F)  
Space Temperature High Alarm Limit — Occupied (F)  
Space Temperature Low Alarm Limit — Unoccupied (F)  
Space Temperature High Alarm Limit — Unoccupied (F)  
Supply Air Temperature Low Alarm Limit — Occupied (F)  
Supply Air Temperature High Alarm Limit — Occupied (F)  
Supply Air Temperature Low Alarm Limit — Unoccupied (F)  
Supply Air Temperature High Alarm Limit — Unoccupied (F)  
Return Air Temperature Low Alarm Limit — Occupied (F)  
Return Air Temperature High Alarm Limit — Occupied (F)  
Return Air Temperature Low Alarm Limit — Unoccupied (F)  
Return Air Temperature High Alarm Limit — Unoccupied (F)  
Temperature Input Low Alarm Limit — Occupied (F)  
Temperature Input High Alarm Limit — Occupied (F)  
Temperature Input Low Alarm Limit — Unoccupied (F)  
Temperature Input High Alarm Limit — Unoccupied (F)  
Outside Air Temperature Low Alarm Limit (F)  
Outside Air Temperature High Alarm Limit (F)  
Mixed Air Temperature Low Alarm Limit (F)  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−10 to 245  
−40 to 245  
−40 to 245  
0 to 250  
65  
80  
45  
100  
45  
120  
35  
180  
60  
90  
35  
120  
−10  
245  
−10  
245  
−40  
120  
0
22  
Mixed Air Temperature High Alarm Limit (F)  
0 to 250  
250  
0
100  
0
Relative Humidity Low Alarm Limit (%)  
Relative Humidity High Alarm Limit (%)  
0 to 100  
0 to 100  
Outside Air Relative Humidity Low Alarm Limit (%)  
Outside Air Relative Humidity High Alarm Limit (%)  
Static Pressure Low Alarm Limit (in. wg)  
0 to 100  
0 to 100  
100  
1.0  
2.5  
0.0  
3.0  
0.0  
3.0  
0
0 to 5.0  
Static Pressure High Alarm Limit (in. wg)  
0 to 5.0  
Supply Velocity Low Alarm Limit (in. wg)  
0 to 3.0  
Supply Velocity High Alarm Limit (in. wg)  
0 to 3.0  
Return Velocity Low Alarm Limit (in. wg)  
0 to 3.0  
Return Velocity High Alarm Limit (in. wg)  
0 to 3.0  
Delta CFM x 100 (CCFM) Low Alarm Limit  
0 to 250  
Delta CFM x 100 (CCFM) High Alarm Limit  
0 to 250  
250  
800  
800  
Air Quality Sensor 1 High Alarm Limit (ppm)  
0 to 2000  
0 to 2000  
Air Quality Sensor 2 High Alarm Limit (ppm)  
Preheat Coil/AOTC Master Proportional Gain  
Preheat Coil/AOTC Master Integral Gain  
Preheat Coil/AOTC Master Derivative Gain  
Preheat Coil/AOTC Submaster Gain  
Preheat Coil/AOTC Submaster Center Value (%)  
Preheat Coil/AOTC Fan/Off Value (F)  
Preheat Coil/AOTC Sensor  
0.0 to 20.0  
0.0 to 2.0  
0.0 to 20.0  
−20.0 to 20.0  
0 to 100 F  
35 to 65  
5.0  
0.3  
0.0  
−5.0  
50  
23  
24  
40  
0 to 128  
0
Discrete Temperature Control Sensor  
Discrete Temperature Control Logic  
Discrete Temperature Control Hysteresis (F)  
0 to 128  
0 to 1  
0 to 20  
0
0
2
Service/Maintenance Limits (hours x 1000)  
Service/Maintenance Elapsed Hours (hours x 1000)  
0 to 99  
0 to 99  
0
0
26  
LEGEND  
AOTC  
OAVP  
Analog Output Temperature Control  
Outside Air Velocity Pressure  
83  
Example 8 — Configuration of Measurements  
— Used to verify software version.  
KEYBOARD  
ENTRY  
DISPLAY  
COMMENTS  
RESPONSE  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Used to verify and change factory configura-  
Measurements are displayed using  
English (0 = English, 1 = Metric)  
UNIT 0  
UNIT 1  
UNIT 0  
tion. Requires password entry in  
. See Example 7.  
Measurements are now displayed  
using the Metric system  
NOTE: When more than one unit is connected to the  
Carrier Comfort Network, the element address must be changed  
on all but one unit. The element address system default  
is 1, and element address numbers cannot be repeated.  
Element address must be changed at the local interface  
device.  
Measurements are returned to  
English  
Example 9 — User Configurations  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
USER CFG User configurations  
NTEN DSB NTFC is disabled  
Example 7 — Reading and Changing  
Factory Configurations  
NTEN EN  
NTFC is enabled  
KEYBOARD  
ENTRY  
DISPLAY  
COMMENTS  
RESPONSE  
NTEN DSB NTFC is disabled  
Factory configuration sub-  
function of service function  
FACT CFG  
HUEN 0  
HUEN 1  
HUEN 0  
Humidifier control is none  
TYPE CV  
UNIT TYPE IS CV  
TYPE VAV  
COOL COI  
DXST 2  
Unit type is constant volume  
Unit changed to analog humidifier  
control  
Explanation is scrolled across  
screen  
Humidifier control is changed back  
to none  
Unit type is changed to VAV  
Cooling type is coil  
Scroll past occupied heating  
(disabled)  
OHEN DSB  
DX cooling stage quantity is 2  
RSEN DSB Space temperature reset (disabled)  
Heating type is hot water/  
steam coil  
Scroll past demand limiting  
HEAT HCL  
HEAT NON  
HEAT ELE  
HEAT COI  
EHST 0  
DLEN DSB  
(disabled)  
Changed to no heat unit  
Changed to electric heat  
FTEN DSB  
Fan tracking (disabled)  
OAEN DSB Constant outside air (disabled)  
NPEN DSB Night purge (disabled)  
Heating type is changed back  
to hot water/steam coil  
Electric heater stages = 0  
AQEN DSB Indoor air quality (disabled)  
Electric heater stages = N,  
where N = number of stages  
Indoor air quality priority  
IAQP DSB  
EHST N  
level (disabled)  
MIXD ALG  
MIXD NON  
IAQT 1  
Unit with mixed air dampers  
Changed to without dampers  
OSEN DSB Optimal start is disabled  
OSEN EN  
Optimal start is enabled  
Indoor air quality type  
is single gas sensor  
OSEN DSB Optimal start is disabled  
Mixed air temperature  
protection enabled  
MATP YES  
BUS 0  
TSCH 1  
TSCH 2  
TSCH 1  
TOVR 0  
TOVR 1  
TOVR 0  
Time schedule No. 1 is enabled  
Time schedule No. 2 is enabled  
Bus number = 0  
Time schedule is changed back to  
No. 2  
ADR 1  
Element address = 1  
Element address changed to 2  
Password  
ADR 2  
Time override value = 0 hrs  
Time override value = 1 hr  
Time override value = 0 hrs  
PSW XXXX  
— Used to change the HSIO display of the measure-  
ments from English to Metric. See Example 8.  
NTFC  
Nighttime Free Cooling  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Used to read or change factory configuration of  
user options. See Example 9.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
84  
— Used to read or change factory configuration  
of heating coil. See Example 10.  
— Used to read or change configuration of  
night purge option.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
Example 10 — Configuration of Heating Coil  
— Used to read or change configuration of  
KEYBOARD DISPLAY  
COMMENTS  
ENTRY  
RESPONSE  
constant outside air option and outside air velocity pressure  
sensor.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
Heat coil field configuration  
subfunction of service function  
HEATCOIL  
MPG 8.0  
MPG N  
Master proportional gain  
— Used to read or change configuration of in-  
Master proportional gain value is  
changed to N, where N = new value  
within the allowable range  
door-air quality option and AQ1 sensor.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
MIG 0.3  
Scroll past master integral gain  
Master derivative gain  
— Used to read or change configuration of in-  
door-air quality option and AQ2 sensor.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
MDG 0.0  
MDG 0.0  
Master derivative gain value  
remains 0.0 (old value is still  
displayed). N value is not within  
the allowable range  
— Used to read or change factory configura-  
tion of Adaptive Optimal Start/Stop.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
SMG −7.5  
SCV 50%  
FOV 40  
SMR N  
Submaster gain  
— Used to read or change factory configura-  
Submaster center value  
Fan off value  
tion of space temperature reset. See Example 11.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
Display of submaster reference  
value  
— Used to read or change loadshed group  
The submaster reference value  
has been forced  
and number. See Example 12.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
SMR X  
The submaster reference value  
force has been removed  
SMR N  
Example 11 — Configuration of Space  
Temperature Reset  
NOTE: The subfunctions to configure the cooling coil  
, inlet  
guide vanes  
heaters  
, mixed air damper  
, and electric  
KEYBOARD  
ENTRY  
DISPLAY  
COMMENTS  
RESPONSE  
,
are performed in the same manner as  
SPCRESET  
Space temperature reset field  
configuration subfunction of  
service function  
Example 10.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
RTIO 3  
RTIO N  
Reset ratio set at 3  
Ratio changed to N, where  
N = new value within the  
allowable range  
— Used to read or change factory configuration of  
cooling (chilled water coil or direct expansion).  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
LIMT 10  
LIMT N  
Reset limit set at 10  
— Used to read or change configuration of direct  
Reset limit changed to N,  
where N = new value between  
0 and 20  
expansion cooling options.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Used to read or change factory configuration of  
Example 12 — Configuration of Loadshed  
inlet guide vanes.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
LOADSHED  
Loadshed field configuration  
subfunction of service function  
— Used to read or change configuration of  
mixed air dampers.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
LSGP 1  
LSGP 2  
Loadshed group 1  
Loadshed group changed to 2  
— Used to read or change configuration of elec-  
tric heater.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Used to read or change factory configura-  
tion of Nighttime Free Cooling (NTFC) option.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
85  
Example 14 — Configuration of Alarm Limits  
— Used to read or change field configuration  
of fan tracking. See Example 13.  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
Alarm limit field configuration of  
subfunction of service function  
ALRMLIMT  
SPLO 65  
SPHO 80  
SPLU 45  
SPHU 100  
Scroll past space temperature low  
limit (occupied mode)  
— Used to read or change factory configura-  
tion of humidity control.  
Scroll past space temperature high  
limit (occupied mode)  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
Scroll past space air temperature  
low limit (unoccupied mode)  
— Used to read or change factory configura-  
tion of alarm limits. See Example 14.  
Scroll past space air temperature  
high limit (unoccupied mode)  
Supply-air temperature low limit set  
at 45 F (occupied mode)  
SALO 45  
SALO N  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
Supply-air temperature low limit  
changed to N, where N = new  
value within allowable range  
(−10 F to 245 F)  
— Used to read or change field configuration  
of analog temperature control. See Example 15.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
Example 15 — Configuration of Analog  
Temperature Control  
— Used to read or change field configuration  
of discrete temperature control. See Example 16.  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
AO CTRL  
Analog temperature control  
configuration subfunction of  
service function  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
Example 13 — Configuration of Fan Tracking  
Scroll past master proportional  
gain  
MPG 5.0  
MIG 0.3  
MDG 0.0  
SMG −5.0  
SCV 50  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
Scroll past master integral gain  
Scroll past master derivative gain  
Scroll past submaster gain  
FANTRACK Fan tracking field configuration  
subfunction of service function  
Supply velocity upper limit  
= 1.5 in. wg  
SVUL 1.5  
Supply velocity upper limit  
SVUL 2.0  
Scroll past submaster center  
value  
changed to 2.0 in. wg  
Scroll past return velocity upper  
limit (1.5 in. wg)  
RVUL 1.5  
FOV 40  
Scroll past fan OFF value  
Controlling temperature sensor  
(none configured)  
SDAR 0  
SDAR 8  
Supply duct area = 0  
SEN 0  
SEN 1  
Supply duct area changed to  
8 sq ft. (Enter whole numbers;  
decimals not accepted)  
Controlling temperature sensor  
configured to sensor 1. Sensor  
codes as follows:  
Scroll past return duct area  
(6 sq ft)  
1 - Supply-air temperature sensor  
(standard)  
RDAR 6  
MPG 0.5  
MIG 0.5  
MDG 0.0  
MDG 4  
Scroll past master proportional  
gain  
2 - Outdoor-air temperature  
sensor (standard)  
Scroll past master integral  
gain  
3 - Mixed-air temperature sensor  
(optional)  
Master derivative gain  
6 - Space temperature sensor  
(standard)  
Master derivative gain  
changed to 4  
7 - Return-air temperature sensor  
(standard)  
SMG 10  
Scroll past submaster gain  
34 - Other optional sensor  
Scroll past submaster  
gain center value  
SCV 50  
SMR N  
SMR X  
Submaster reference value  
Submaster reference value  
(calculated and updated by the  
software)  
Submaster reference value  
forced to N value  
SMR N  
SMR X  
Submaster reference value  
forced to X value  
Force removed from submaster  
reference value. Display shows  
last value prior to force  
SMR X  
SMR N  
Submaster reference value  
force is removed  
86  
Example 16 — Configuration of Discrete  
Temperature Control  
Example 18 — Service/Maintenance  
Alarm Configuration  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
KEYBOARD DISPLAY  
COMMENTS  
COMMENTS  
ENTRY  
RESPONSE  
DO CTRL  
Discrete temperature control  
configuration subfunction of  
service function  
SRV/MTN  
Service/Maintenance alarm  
configuration subfunction of  
service function  
SEN 1  
Controlling temperature sensor  
configured to sensor 1. Sensor  
codes as follows:  
Service/Maintenance alarm  
SMAL 2  
SMAL 5  
limit is 2000 hrs (hours x 1000)  
Service/Maintenance alarm  
limit is changed to 5000 hrs (This  
represents the cumulative number  
of hours the fan must be energized  
before a service/maintenance alarm  
is generated)  
1 - Supply-air temperature sensor  
(standard)  
2 - Outdoor-air temperature  
sensor (standard)  
3 - Mixed-air temperature sensor  
(optional)  
6 - Space temperature sensor  
(standard)  
(NOTE: Entering a . disables the  
alarm function)  
SMEH 3  
Service/Maintenance elapsed  
hours is 3000 (This is the amount of  
time elapsed from the start of the  
service/maintenance alarm interval)  
7 - Return-air temperature  
(standard)  
34 - Other optional sensors  
SEN 34  
TYP 0  
Controlling temperature sensor is  
34, where sensor 34 is one of  
2 optional sensor types  
Example 19 — Timed Override History  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
(space temperature sensor or  
duct temperature sensor)  
Timed override history  
OVRDHIST  
OHR 3  
Discrete output control logic  
(0 = normal logic, 1 = reverse  
logic)  
subfunction of service function  
Within the current 24 hour period  
(beginning at midnight), the unit  
operated for 3 hours in the timed  
override mode (mode 39)  
— Used to read service history. See Example 17.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Used to read or change field configuration  
— Displays system set points. See Table 13 for  
sequence of set points.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
of service maintenance alarm duration and to read elapsed  
time. See Example 18.  
— Displays demand limit set points.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Used to read timed override history. See  
Example 19.  
— Displays time of day and day of week.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
NOTE: The  
functions; the CLR key is used to disable these functions.  
The key may also be used to disable the functions.  
key is used to enable or turn on certain  
— Displays Daylight Savings Time.  
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -  
— Displays holidays (month, day, and duration).  
SET POINT FUNCTION — Set points are entered through  
the keyboard. Set points can be changed within the upper  
and lower limits, which are fixed. See Table 17.  
Table 17 — Set Point Ranges and Defaults  
ALLOWABLE  
SET POINT  
DEFAULT  
Example 17 — Service History Configuration  
RANGE  
Occupied Heating Set Point (F)  
Occupied Cooling Set Point (F)  
Unoccupied Heating Set Point (F)  
Unoccupied Cooling Set Point (F)  
Static Pressure  
40 to 90  
45 to 99  
40 to 90  
70 to 99  
68  
78  
55  
90  
KEYBOARD  
ENTRY  
DISPLAY  
COMMENTS  
RESPONSE  
Service history configuration  
subfunction of service function  
SERVHIST  
SDAY 2  
ST 20  
0 to 5.0  
1.5  
Set Point (in. wg)  
The unit had 2 starts within the  
last 24 hours  
Supply-Air Temperature  
Set Point (F)  
35 to 65  
55  
The unit had a total of 20 starts  
since the unit was manufactured  
Delta CFM Set Point  
Humidity Set Point (%)  
Analog Temperature  
Control Set Point (F)  
Discrete Temperature  
Control Set Point (F)  
Air Quality Sensor 1  
Set Point (ppm)  
0 to 250  
0 to 100  
0
40  
The fan has run for 240 hours  
since unit manufacture.  
FH 240  
4.06.30  
4.19.00  
40 to 100  
−40 to 245  
0 to 2000  
0 to 2000  
0.0 to 5.0  
40  
The unit was last started on  
Thursday at 6:30 am  
0
650  
650  
0.08  
The unit was last stopped on  
Thursday at 7:00 pm  
Air Quality Sensor 2  
Set Point (ppm)  
Outside Air Velocity Pressure  
Set Point (in. wg)  
87  
Example 21 — Setting of Time and Date  
Reading and Changing Set Points — Example 20 shows how  
to read and change system set points. Other set points can be  
changed by following the same procedure. Refer to  
Table 13 for the display sequence of set points in each sub-  
function.To adjust any parameter after enabling the func-  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
TIME  
Time display  
subfunction of  
set point function  
tion, press  
until desired parameter is displayed. Key in  
MON 16:00 Current setting  
is Monday,  
new value and press  
. If input is within the allowable  
4:00 pm  
range, the display shows the parameter and new value. If  
the input is not within the allowable range, the old value  
remains displayed.  
TUE 13:05 New setting of  
Tuesday,  
1:05 pm is  
entered and  
displayed  
Example 20 — Reading and Changing  
System Set Points  
JAN 01 96  
Current setting  
is January 1,  
1996  
KEYBOARD DISPLAY  
COMMENTS  
ENTRY  
RESPONSE  
FEB 27 96 New setting of  
February 27,  
SETPOINT System set points  
1996 is entered  
and displayed  
Present occupied heating set point  
is 68.0  
OHSP 68.0  
OHSP 70.0 Key in 70 and press ENTR, display  
shows new occupied heating set  
point is 70, which is within the  
allowable range  
Example 22 — Setting Daylight Savings Time  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
OCSP 78.0 Present occupied cooling set point  
is 78.0  
DAYLIGHT Daylight savings time field  
configuration of set point  
function  
OCSP 78.0 Key in 30 and press ENTR, display  
still shows occupied cooling set point  
as 78.0 because 30 is not within the  
allowable range. See Table 15  
ENM X  
Month when daylight savings  
time begins  
OCSP 75.0 Key in 75 and press ENTR, display  
shows new occupied cooling set  
point is 75.0, which is within the  
allowable range  
ENM 4  
Daylight savings time  
configured to start Month 4  
(April)  
END X  
Day of month when daylight  
savings time begins  
END 16  
Daylight savings time  
configured to start on the  
16th of the month  
Reading and Changing Time and Date Display — Time is  
entered and displayed in 24-hour (military) time. The day of  
the week is entered as a number: 1 = MON, 2 = TUE...7 =  
SUN. The month is also entered as a number: 1 = JAN, 2 =  
ENT X  
Time of day when daylight  
savings time begins  
ENT 2.00  
Daylight savings time  
configured to start at 2:00 am  
on the 16th of April  
FEB...12 = DEC. The  
entering the time and date. See Example 21.  
key is used as the colon when  
LVM X  
Month when daylight savings  
time ends  
Reading and Changing Daylight Savings Time — Example 22  
shows how to read and change daylight savings time. The  
month is entered as a number: 1 = January, 2 = February...12  
= December. The day of week and time of day are entered  
as explained in Reading and Changing Time and Date  
Display above.  
LVM 11  
Daylight savings time  
configured to end Month 11  
(November)  
LVD X  
Day of month when daylight  
savings time ends  
LVD 12  
Daylight savings time  
configured to end on the 12th  
of November  
LVT X  
Time of day when daylight  
savings time ends  
LVT 2.00  
Daylight savings time  
configured to end at 2:00 am  
on November 12  
88  
Figure 75 shows a Schedule I example for an office build-  
ing with the unit operating on a set point schedule. The  
schedule is based on building occupancy with 3-hour off-  
peak cool down period from midnight to 3 am following week-  
end shutdown. To learn how this sample schedule can be  
programmed, see Example 24. The same scheduling proce-  
dures can be used to set optional discrete output  
Reading and Changing Holidays — Example 23 explains how  
to set holidays. Up to 18 holiday periods can be set for one  
calendar year. When the calendar year changes the holidays  
must be reconfigured for the new year.  
Example 23 — Setting of Holidays  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
Schedule II. Subfunctions  
through  
define  
HOLIDAY  
Holiday field config-  
uration subfunction  
of set point function  
schedule of air handler (Schedule I). Subfunctions  
through  
define schedule of optional  
NEW  
First holiday  
configuration  
discrete output (Schedule II).  
JUL 04 01  
The first holiday is  
configured to start  
Month 7 (July), day 4  
(July 4) and last for  
one day  
NOV 23 02 The second holiday  
is configured to start  
Month 11 (Novem-  
ber), day 23 and last  
for 2 days.  
SCHEDULE FUNCTION — Two schedules are provided  
with the PIC system. Schedule I automatically switches the  
unit from an occupied mode to an unoccupied mode. Sched-  
ule II automatically changes the optional discrete output from  
occupied to unoccupied mode.  
Each schedule consists of from one to 8 occupied time  
periods, set by the operator. These time periods can be flagged  
to be in effect or not in effect on each day of the week. The  
day begins at 00.00 and ends at 24.00. The unit is in unoc-  
cupied mode unless a scheduled time period is in effect. If  
an occupied period is to extend past midnight, it must be  
programmed in the following manner: Occupied period must  
end at 24:00 hours (midnight); a new occupied period must  
be programmed to begin at 00:00 hours on the next day.  
The time schedule can be overridden to keep the unit or  
optional discrete output in the occupied mode for 1, 2, 3, or  
4 hours on a one-time basis.  
The air handler can be configured for an applicable holiday/  
shutdown schedule. This function can only be used if the  
PIC is connected to the Carrier Comfort Network. The net-  
work will send a holiday message (flag) to the unit on the  
appropriate holiday. The unit then uses the schedule that has  
been set for the holiday period. The unit automatically re-  
turns to its normal schedule after the holiday period is  
complete.  
Fig. 75 — Schedule I Sample Time Schedule  
89  
Example 24 — Using the Schedule Function  
Example 24 — Using the Schedule Function (cont)  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENT  
COMMENT  
PROGRAMMING PERIOD 1:  
PROGRAMMING PERIOD 2:  
For this example, period 2 is used on Monday and Tuesday.  
PERIOD 1  
Define schedule period 1  
Define scheduling  
PERIOD 2  
OCC 00.00 Start of occupied time.  
For this example, first  
period should start here  
(at midnight) so no  
period 2  
OCC 00.00 Start of occupied time  
OCC 7.00  
Occupied time will  
start at 7:00 am  
entry is needed  
UNO 00.00 Start of unoccupied time  
(end of period). For this  
example, period 1  
UNO 00.00 Start of unoccupied  
time (end of period)  
for this example,  
period 2 should end  
at 18:00 (6:00 pm)  
should end at  
3:00 am  
Period 1 ends at  
UNO 3.00  
Period 2 ends at  
UNO 18.00  
3:00 am  
18:00 (6:00 pm)  
MON NO  
Monday is not flagged  
for period 1. To put  
period 1 into effect on  
Monday, Monday must  
be flagged yes  
MON NO  
Monday is not flagged  
for period 2. To put  
period 2 into effect  
on Monday, Monday  
must be flagged yes  
MON YES  
TUE YES  
Monday is now flagged  
for period 1 to be in  
effect  
MON YES  
TUE NO  
Monday is now flagged  
for period 2 to be  
in effect  
For this example, period 1  
is to be in effect on  
Monday only. All other  
days must be checked  
to be sure that they  
are flagged no. If any  
day is flagged yes,  
change to no  
Tuesday is not flagged  
for period 2. To put  
period 2 into effect  
on Tuesday, Tuesday  
must be flagged yes  
TUE YES  
WED YES  
Tuesday is now flagged  
for period 2 to be  
in effect  
TUE NO  
Tuesday is now flagged  
no for period 1  
For this example,  
period 2 is to be in  
effect only on  
Monday and Tuesday.  
All other days must  
be checked to be  
sure that they are  
flagged no. If a day  
is flagged yes,  
change to no  
WED NO  
Wednesday is now  
flagged no for  
period 2  
90  
Example 24 — Using the Schedule Function (cont)  
Example 24 — Using the Schedule Function (cont)  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENT  
COMMENT  
PROGRAMMING PERIOD 3:  
PROGRAMMING PERIOD 6:  
For this example, Period 6 is used for holiday only.  
For this example, Period 3 is used on Wednesday only.  
OCC 00.00  
Start of occupied time  
OCC 00.00 Start of occupied time  
Occupied time will start  
at 20:00 (8:00 pm)  
Occupied time will start  
OCC 20.00  
UNO 00.00  
OCC 7.00  
at 7:00 am  
Start of unoccupied  
time (end of period 6).  
For this example,  
period 6 should end at  
21:00 (9:00 pm)  
UNO 00.00 Start of unoccupied  
time (end of period 3).  
For this example,  
period 3 should end at  
21:30 (9:30 pm)  
Period 6 ends at  
21:00 (9:00 pm)  
Period 3 ends at  
UNO 21.30  
UNO 21.00  
MON NO  
21:30 (9:30 pm)  
Check to be sure that  
Monday through  
Sunday are flagged  
no for period 6  
MON NO  
Check to be sure that  
Monday and Tuesday  
are flagged no for  
period 3  
TUE NO  
WED NO  
THU NO  
FRI NO  
TUE NO  
WED NO  
Wednesday is flagged  
no. Change to yes  
WED YES  
THU NO  
Wednesday is now  
flagged yes for  
period 3  
Check to be sure that  
all other days are  
flagged no  
SAT NO  
SUN NO  
HOL NO  
HOL YES  
FRI NO  
SAT NO  
SUN NO  
HOL NO  
Holiday is flagged no.  
Change to yes  
Holiday is now flagged  
yes for period 6  
Period 4 and 5 can be programmed in the same manner, flagging  
Thursday and Friday yes for period 4 and Saturday yes for period 5.  
For this example, periods 7 and 8 are not used; they should be pro-  
grammed OCC 00.00, UNO 00.00.  
NOTE: When a day is flagged yes for 2 overlapping periods, occu-  
pied time will take precedence over unoccupied time. Occupied times  
can overlap in the schedule with no consequence.  
To extend an occupied mode beyond its normal termination for a  
one-time schedule override, program as shown below:  
Override is set for 0; enter  
OVRD 0  
OVRD 3  
the number of hours of  
override desired  
Unit will now remain in  
occupied mode for an  
additional 3 hours  
91  
CONTROL OPERATING SEQUENCE  
NTFC is scheduled to run only between the hours of  
Constant Volume and Variable Air Volume Units  
3:00 am and 7:00 am.  
TWO-POSITION DAMPER CONTROL — Two-position  
damper control opens or closes field-supplied and installed  
two-position outdoor-air dampers in order to provide mini-  
mum outdoor air ventilation.  
If the supply fan is OFF, the damper is closed. If the sup-  
ply fan is ON, the control determines if the unit is in the  
OCCUPIED mode. If unit is in the OCCUPIED mode, the  
dampers open. If unit is in the UNOCCUPIED mode, the  
dampers close.  
NIGHT PURGE — During the unoccupied period, this fea-  
ture starts the fans and opens the mixed-air dampers to re-  
move stagnant air and airborne pollutants from the building  
space.  
If the current time is within the configured night purge  
duration, the control reads the outdoor air temperature and  
determines the mixed-air damper position. If the outdoor air  
temperature is less than the configured NTFC lockout tem-  
perature, the system sets the mixed-air dampers at the con-  
figured low temperature position. If the outdoor-air temperature  
is greater than the NTFC set point, or the enthalpy is high,  
the system sets the dampers at the configured high tempera-  
ture position.  
When the outside-air temperature is below the NTFC set  
point and the low temperature night purge damper position  
is set to zero, night purge is not performed. Also, when the  
outside air temperature is above the NTFC set point and en-  
thalpy is high, if the high temperature night purge damper  
position is set to zero, night purge is not performed.  
FILTER STATUS CONTROL — This control sequence moni-  
tors one or more airflow switches which measure the dif-  
ferential pressure between the upstream and downstream side  
of a filter.  
When the filter becomes dirty or needs to be replaced, the  
airflow switches send a discrete signal to the processor mod-  
ule. This, in turn, generates an alarm at the Local Interface  
Device or Building Supervisor.  
FAN CONTROL — The supply fan is started or stopped based  
on the occupancy schedule, adaptive optimal start, night-  
time free cooling, unoccupied heating, unoccupied cooling,  
demand limiting, night purge, or timed override.  
The start of an occupied period is determined by either  
the occupancy schedule or optimal start. If optimal start is  
not selected, the supply fan starts at the occupied time en-  
tered in the occupancy schedule. If optimal start is selected,  
the fan starts at the calculated start time. The fan stops at the  
unoccupied time entered in the occupancy schedule. (Timed  
override may be used to extend the occupied period between  
1 and 4 hours.)  
During the unoccupied period, whenever the space tem-  
perature falls below the unoccupied heating set point or rises  
above the unoccupied cooling set point, the supply fan en-  
ergizes and runs until the space temperature returns to within  
the required limits.  
The supply fan can also run between the hours of  
3:00 am and 7:00 am when the unit is in the Nighttime Free  
Cooling mode to pre-cool the space prior to the Occupied  
period.  
Night purge ends when the occupied time period begins.  
QUICK TEST — The Quick Test is initiated and controlled  
at the local interface device (HSIO). It allows the service  
person or building owner to test all inputs and outputs of the  
PIC controls. When used, it displays all current values of  
input channels and allows the user to exercise all output  
channels.  
Quick test suspends all process algorithms and forces all  
outputs with a service priority.  
All service forces are removed when Quick Test is exited  
and control is returned to the process algorithms.  
ANALOG OUTPUT TEMPERATURE CONTROL/  
PREHEAT COIL CONTROL — The analog output tem-  
perature control adjusts an analog output to a fixed set point,  
based on any analog temperature sensor connected to the unit.  
(Applicable sensors are: space temperature sensor, outside-  
air temperature sensor, mixed-air temperature sensor, supply-  
air temperature sensor, and return-air temperature sensor.)  
If the fan is ON, the control identifies the controlling tem-  
perature sensor, reads the sensor and compares the tempera-  
ture to the configurable set point. It then calculates the tem-  
perature required to satisfy the conditions.  
The calculated value is compared to the actual tempera-  
ture and the corresponding output is modulated to the  
required position.  
The preheat coil control adjusts the steam or hot water  
valve. The valve is modulated to raise the temperature of  
incoming outside air. The control uses a sensor downstream  
from the preheat coil to monitor the air temperature.  
If the supply fan is OFF, the heating valve is modulated  
to maintain the desired minimum duct temperature (fan off  
value).  
Constant volume units that are subject to demand limiting  
stop the supply fan whenever a loadshed command is re-  
ceived from the CCN Loadshed option. The supply fan re-  
mains OFF until the loadshed command is cleared or the in-  
ternal maximum loadshed timer expires.  
NIGHTTIME FREE COOL (NTFC) — Nighttime free cool-  
ing is used to start the supply fan to precool the building’s  
interior using outside air. This delays the need for mechani-  
cal cooling when the system enters the Occupied mode.  
The system determines if the outside conditions (tempera-  
ture and enthalpy) are suitable for outside cooling. If so, the  
supply fan is energized and the dampers modulate open. Once  
the space has been sufficiently cooled, the fan stops.  
If the outside air conditions are not suitable, the fan  
remains OFF.  
The unit must have mixed-air dampers to operate NTFC.  
If the supply fan is on and the entering-air temperature is  
below the set point value, the heating valve is modulated to  
obtain the desired leaving-air temperature.  
92  
DISCRETE OUTPUT/ANALOG INPUT CONTROL — The  
discrete output is controlled as a function of a temperature  
sensor connected to the 39L or 39NX unit. (Applicable sen-  
sors are: space temperature sensor, outside-air temperature  
sensor, mixed-air temperature sensor, supply-air tempera-  
ture sensor, and return-air temperature sensor.) The discrete  
output is turned ON/OFF as required to maintain the user  
configured set point.  
HUMIDITY (ANALOG OUTPUT) CONTROL — The hu-  
midity analog output control adjusts the steam valve of the  
steam grid humidifier. The valve is modulated to maintain  
the desired space or desired return-air humidity set point,  
depending on whether a wall-mounted or duct-mounted hu-  
midity sensor is used. A duct high humidity switch is also  
monitored and provides a user adjustable high limit safety.  
If the supply fan is OFF, the steam valve is held closed.  
The controlling sensor is identified and its value is read.  
The control determines which user-configurable control logic  
(normal or reverse) is required.  
The control compares the sensor value to the configured  
set point.  
If normal logic is used, the discrete output is turned ON  
when the sensor value is equal to or greater than the set point.  
This output is turned OFF when the sensor value is less than  
the set point decreased by a user configurable hysteresis.  
If the supply fan is ON, and the unit is in the Unoccupied  
mode, the valve is held closed.  
If the supply fan is ON and the unit is in the Occupied  
mode, the system determines the status of the duct high hu-  
midity switch. If the duct humidity is above the switch set  
point, the valve is held closed. If the duct humidity is less  
than the switch set point, the control reads the humidity sen-  
sor, compares the value to the set point and modulates the  
output as required to satisfy conditions.  
If reverse logic is used, the discrete output is turned ON  
whenever the sensor value is less than the set point. This  
output is turned OFF when the sensor value is greater than  
the set point increased by a user configurable hysteresis.  
HUMIDITY (DISCRETE OUTPUT) CONTROL — The hu-  
midity control sequentially adjusts a 2-stage humidifier. The  
humidifier is controlled to maintain a desired space or return-  
air humidity, depending on whether a wall-mounted or duct-  
mounted humidity transmitter is used.  
The first stage of humidification energizes the humidifier  
spray pump (if applicable) along with the first stage of the  
humidifier. The second stage of humidification energizes the  
second stage of the humidifier.  
A duct high humidity switch is also monitored and pro-  
vides a user adjustable duct high humidity limit safety.  
If the fan status is ON and the unit is in the Occupied  
mode, the control reads the space or return-air humidity sen-  
sor. If the humidity is 2% less than the humidity set point,  
the first stage is turned ON.  
DISCRETE OUTPUT, TIMECLOCK CONTROL — This  
control sequence turns ON an output channel when the cur-  
rent time of day is greater than or equal to the Occupied time  
and less than the next Unoccupied time. This discrete output  
is OFF at all other times. The output can be used for lighting  
control, pump control, or to control other devices which have  
to be ON during the Occupied period and OFF during the  
Unoccupied period. This control sequence operates under its  
own time schedule (Schedule II).  
Using the local interface device or building supervisor, the  
output may be overridden to extend the occupied period be-  
tween 1 and 4 hours.  
The control determines the output that is under time-  
clock control. The current time of day is compared to the  
Occupied time and to the next Unoccupied time. If the  
current time of day is equal to or within the Occupied time  
period, the discrete output is turned ON. If the current time  
of day is equal to or within the Unoccupied time period, the  
discrete output is turned OFF.  
If the humidity is 5% less than the humidity set point, both  
stages are turned ON.  
As the humidity increases, the stages are turned OFF as  
follows: When the humidity is within 2% of the set point,  
the second stage of the humidifier is turned OFF. When the  
humidity is greater than or equal to the set point, both stages  
are turned OFF. If the high humidity switch is tripped, all  
stages of the humidifier are turned OFF.  
93  
INDOOR-AIR QUALITY (IAQ) — This function main-  
tains the correct occupied ventilation rate using CO2 as an  
indicator of occupancy level or controls the levels of volatile  
organic compounds (VOCs) or other indoor air pollutants by  
modulating the mixed air dampers. Varying quantities of out-  
door air are admitted during the Occupied period to main-  
tain the ventilation rate at its set point or pollutants at or  
below the configured set points of the air-quality (AQ) sen-  
sors. See Fig. 76.  
CO2 sensors are available from the factory as options for  
field installation. VOC or other types of sensors can be field-  
supplied and installed. Sensors used with the IAQ feature  
can be configured several different ways:  
reads the AQ1 sensor input and compares it to the config-  
ured set point. The control then calculates the minimum damper  
position to maintain the set point. If no other control is at-  
tempting to adjust the dampers to a more fully open position  
than the IAQ control, the damper is adjusted to the position  
determined by the IAQ control. Otherwise, the damper is  
positioned by the superseding control routine or at its con-  
figured minimum position.  
Systems with Two AQ Sensors (Separate Readings) — The  
preceding sequence for the AQ1 sensor also applies to the  
AQ2 sensor, but the damper position is determined by either  
the AQ1 or the AQ2 sensor according to which sensor value  
demands the more fully open damper position.  
Systems with Two AQ Sensors (Differential Check) — If dif-  
ferential sensing is configured for two VOC sensors, the con-  
trol reads the AQ2 (outside air) sensor to determine if its  
value is greater or less than that of the AQ1 (indoor air) sen-  
sor. If the AQ2 value is greater than the value of the AQ1  
sensor, the mixed-air damper position is set to 0. If the AQ2  
value is less than the AQ1 value (by at least 1% of the con-  
figured minimum sensor value), the control uses the AQ1  
value to modulate the dampers and maintain the AQ set point.  
IAQ System Protection — To protect the system against coil  
freeze-up in cold climates or high heat and humidity in warm  
climates, the system provides several user-selectable fea-  
tures to override or modify the IAQ functions. An adjustable  
maximum position for the mixed-air damper is provided for  
each AQ sensor, and a selection is available to maintain the  
minimum mixed-air temperature at approximately 45 F. Space  
temperature and humidity protection can temporarily sus-  
pend IAQ functions until the temperature and humidity con-  
ditions return to the desired set points. On VAV systems dur-  
ing cooling, the IAQ function can be limited to maintain the  
required supply-air temperature.  
• One sensor can be installed in either the space or return air  
stream to continuously monitor a single gas.  
• Two sensors (monitoring the same gas) can be installed in  
different locations to provide separate inputs. For ex-  
ample, one sensor can be located in an occupied space and  
another in the return air duct, or each sensor can be in-  
stalled in a different occupied space.  
• Two sensors (typically VOC sensors monitoring the same  
gas) can be installed inside and outside the occupied space  
for comparative measurements. The control is configured  
to modify the damper position based on the value of the  
sensor in the occupied space, but before admitting outside  
air, the control performs a differential check to determine  
if the value of the sensor measuring the outside air is higher.  
If the outside sensor has a higher value, the damper does  
not change position.  
Systems with One AQ Sensor — During the unoccupied  
period, the minimum damper position maintained by the  
IAQ control is 0. During the occupied period, the control  
94  
LEGEND  
AQ  
Air Quality Sensor  
IAQ  
MAT  
OAT  
RH  
Indoor-Air Quality  
Mixed-Air Temperature  
Outdoor-Air Temperature  
Relative Humidity  
Supply-Air Temperature  
Space Temperature  
Variable Air Volume  
SAT  
SPT  
VAV  
Fig. 76 — Indoor-Air Quality (IAQ) Control Operation  
95  
SMOKE CONTROL — When the 39L or 39NX unit is  
equipped with an optional smoke control and a fire system  
is installed, 4 modes are provided to control smoke within  
areas serviced by the air-handling unit. Each mode must be  
energized individually from the approved building fire alarm  
system, and the corresponding alarm is then generated at the  
local interface device or Building Supervisor.  
set point, and a ‘K’ factor in minutes/degrees to calculate a  
start time offset, which is the time in minutes that the system  
should be started in advance of the occupied time. The con-  
trol monitors its results and adjusts the K factor to assure  
that the Occupied set point is achieved at time of occupancy.  
Constant Volume Units Only  
HEATING COIL CONTROL — The heating coil control ad-  
justs the steam or hot water valve. The valve is modulated  
to prevent the space temperature from falling below the de-  
sired set point.  
If the supply fan is OFF, the heating valve is modulated  
to maintain a desired minimum duct temperature (fan off value).  
The system must include a separate return fan and an ex-  
haust air damper with a 4 to 20 mA actuator.  
The building fire alarm system must provide 4 normally-  
open dry contact closures and a double-pole, double-throw  
(DPDT) relay (24 vac coil, contacts rated 10 amps at  
240 vac) for the Fire Shutdown mode.  
If the fan is ON, the system reads the space sensor and  
computes the supply-air temperature required to satisfy  
conditions.  
Fire Shutdown Mode — The fire alarm system must provide  
a normally-open dry contact closure which, when activated,  
energizes the Fire Shutdown mode.  
Once the required supply-air temperature has been  
calculated, it is compared to the actual supply-air tempera-  
ture and the heating coil valve modulates to the required  
position.  
When the Fire Shutdown mode is energized, the supply  
and return fans stop, the outside and exhaust air dampers  
close, and the return-air dampers open.  
This mode remains in effect as long as the input signal is  
maintained at the fire system panel. An alarm is generated  
from this input and sent to the Building Supervisor. In order  
for this mode to be initiated, the input signal must be main-  
tained for no less than 2 seconds.  
CHILLED WATER COIL COOLING CONTROL — The  
cooling coil control adjusts the chilled water valve. The valve  
is modulated to prevent space temperature from exceeding  
the desired set point. The valve holds its normal position if  
the space temperature is below the set point or the supply  
fan is OFF.  
If the fan is ON, the control reads the humidity sensor  
(if supplied) and compares the value to the high humidity  
limit.  
If the humidity is higher than the high humidity limit, the  
chilled water valve fully opens.  
If the humidity is below the high humidity limit, the con-  
trol reads the space temperature sensor and computes the supply-  
air temperature required to satisfy conditions.  
Evacuation Mode — The building fire alarm system must pro-  
vide a normally-open dry contact closure which, when ac-  
tivated, energizes the Evacuation mode. When the  
Evacuation mode is energized, the supply fan shuts down,  
the return fan starts, the outside-air and return-air dampers  
close, and the exhaust air dampers open.  
This mode remains in effect for as long as the input signal  
is maintained at the fire system panel. An alarm is generated  
from this input and sent to the Building Supervisor. In order  
for this mode to be initiated, the input signal must be main-  
tained for no less than 2 seconds.  
Once the required supply-air temperature has been cal-  
culated, it is compared to the actual supply-air temperature  
and the chilled water valve modulates to the position re-  
quired to maintain desired conditions.  
Pressurization Mode — The building fire alarm system must  
provide a normally-open dry contact closure which, when  
activated, energizes the Pressurization mode. When the  
Pressurization mode is energized, the supply fan starts, the  
return fan shuts down, the outside dampers open, and the  
exhaust and return-air dampers close.  
This mode remains in effect as long as the input signal is  
maintained at the fire system panel. An alarm is generated  
from this input and sent to the Building Supervisor. In order  
for this mode to be initiated, the input signal must be main-  
tained for no less than 2 seconds.  
See Fig. 77 for cooling coil operation flow chart.  
DIRECT EXPANSION COOLING CONTROL — The  
direct expansion (DX) cooling control regulates the DX cool-  
ing system. The DX cooling stages are energized and deen-  
ergized to prevent the space temperature from exceeding the  
desired set point. The stages remain off if the space tem-  
perature is below the set point or the supply fan is OFF.  
If the supply fan is ON, the control reads the humidity  
sensor (if supplied) and compares the value to the high  
humidity limit. If the humidity is higher than the high hu-  
midity limit, the DX cooling stages are energized to main-  
tain a minimum supply-air temperature. If the humidity is  
below the limit, the control reads the space temperature sen-  
sor and computes the supply-air temperature required to sat-  
isfy conditions.  
Once the required supply-air temperature has been cal-  
culated, it is compared to the actual supply-air temperature  
and the required DX cooling stages are energized to main-  
tain the desired conditions.  
Smoke Purge Mode — The building fire alarm system must  
provide a normally-open dry contact closure which, when  
activated, energizes the smoke purge mode.  
When the smoke purge mode is energized, the supply fan  
starts, the return fan starts, the outside air and exhaust air  
dampers open and the return-air dampers close.  
This mode remains in effect as long as the input signal is  
maintained at the fire system panel. An alarm is generated  
from this input and sent to the Building Supervisor. In order  
for this mode to be initiated, the input signal must be main-  
tained for no less than 2 seconds.  
ADAPTIVE OPTIMAL START — Optimal Start is used to  
heat up or cool down the space prior to occupancy. The pur-  
pose is to have the space temperature approach and then achieve  
the occupied set point by time of occupancy. The control  
uses outdoor-air temperature, space temperature, occupied  
See Fig. 77 for cooling operation and Fig. 78 for DX sub-  
master gain operation. For more complete information, refer  
to the Application Data book for Product Integrated Con-  
trols with DX Cooling.  
96  
LEGEND  
CCV  
CV  
Cooling Coil Valve  
Constant Volume  
Direct Expansion  
Return-Air  
DX  
RAT  
Temperature  
Relative Humidity  
RH  
Fig. 77 — Cooling (DX and Chilled Water) Control Operation  
97  
LEGEND  
DX  
Direct Expansion  
MAT  
RAT  
SAT  
Mixed-Air Temperature  
Return-Air Temperature  
Supply-Air Temperature  
Fig. 78 — DX Submaster Gain Control Operation  
98  
MIXED-AIR DAMPER CONTROL — The mixed-air damper  
control adjusts modulating outside-air, return-air, and exhaust-  
air dampers. When outside air conditions are unsuitable for  
atmospheric cooling, the dampers are held to an adjustable  
minimum outside air position. When outside air conditions  
are suitable for atmospheric cooling, the mixed-air dampers  
are modulated to maintain a space temperature that is be-  
tween the heating and cooling set points in an effort to mini-  
mize the need for heating or mechanical cooling. The damper  
set point is automatically adjusted as a function of outdoor-  
air temperature or can be set to a fixed value by the user.  
If the supply fan is OFF, the mixed-air dampers are kept  
closed to outside air and open to return air.  
If the fan is ON, the system checks to see if the system is  
in the HEAT mode. If system is in the HEAT mode, the mixed-  
air dampers are held in the minimum position.  
If the system is not in the HEAT mode, it determines if the  
outside conditions are suitable for atmospheric cooling. The  
control compares the outdoor-air temperature to the space  
temperature. If the outdoor-air temperature is less than the  
space temperature, the system does either an enthalpy check  
(using an outside-air enthalpy switch) or a differential en-  
thalpy check. (Return-air temperature is compared to return-  
air relative humidity for return-air differential enthalpy. Outside-  
air temperature is compared to outside-air relative humidity  
for outside-air differential enthalpy.)  
The control then determines if the outdoor-air tempera-  
ture is below the Nighttime Free Cool Lockout (NTLO). If  
so, the damper set point is changed to 1.0 degree less than  
the Occupied Cooling set point, allowing the system to use  
return air during the heating mode.  
If the fan is ON, the control reads the space temperature  
sensor and calculates the supply-air temperature required to  
satisfy conditions.  
Once the required supply-air temperature has been cal-  
culated, it is compared to the actual supply-air temperature  
to determine the number of heat stages required to satisfy  
conditions. The required stages are energized one at a time,  
with 2-second intervals between stages.  
ADAPTIVE OPTIMAL STOP —Optimal stop allows the space  
temperature to drift to an expanded occupied set point dur-  
ing the last portion of an occupied period. The control cal-  
culates a stop time offset, which is the time in minutes prior  
to the scheduled unoccupied time, during which expanded  
set points can be used. Adaptive optimal stop utilizes space  
temperature, an expanded Occupied set point, and a K factor  
to calculate stop time offset. The amount to expand the Oc-  
cupied set point is user configurable. Like adaptive optimal  
start, the control corrects itself for optimal operation by ad-  
justing the K factor.  
TWO-STEP DEMAND LIMITING (Available on Units  
Connected to the Carrier Comfort Network Only) — If the  
Demand Limit option is enabled, the control receives and  
accepts redline alert and loadshed commands from the  
Network Loadshed option. See the CCN Loadshed manual  
for additional information.  
When a redline alert is received, the Control decreases the  
Occupied Heating set point by 2° F and increases the Oc-  
cupied cooling set point by 2° F.  
When a loadshed command is received, the supply fan turns  
OFF.  
The maximum loadshed timer prevents the system from  
remaining in loadshed, should the control lose communica-  
tions with the Loadshed option. If the timer expires be-  
fore the loadshed command is cleared by the Loadshed op-  
tion, the control clears the loadshed command itself and  
returns to normal control. The loadshed timer is factory set  
at 60 minutes.  
If the outdoor-air temperature is higher than 68 F, the con-  
trol sets the damper set point to 1.0 degree higher than the  
Occupied Heating set point to provide cooling, allowing the  
system to use outside air.  
If the outdoor-air temperature is higher than NTLO but  
less than 68 F, the system sets the damper set point halfway  
between the Occupied Heating and Occupied Cooling set points  
to provide ventilation.  
Variable Air Volume Units Only  
If outside conditions are suitable, the control compares the  
space temperature to the damper set point and computes the  
supply-air temperature required to satisfy conditions.  
Once the required supply-air temperature has been cal-  
culated, it is compared to the mixed-air temperature sensor  
value (if installed), otherwise the supply-air temperature sen-  
sor determines the damper position. The damper adjustment  
rate is limited to 5% per minute if the outside-air tempera-  
ture is less than 40 F. This rate limit prevents nuisance low  
temperature thermostat tripping.  
CONSTANT OUTSIDE AIR (OAC) — During Occupied  
periods, this feature provides a continuous flow of outside  
air into the building. The OAC control modulates the mixed-  
air damper to a configurable minimum open position to en-  
sure outside air is admitted. During Unoccupied periods, the  
control signals the dampers to fully close.  
To monitor the outside airflow during Occupied periods,  
the OAC control reads the outside-air velocity pressure (OAVP)  
sensor, compares its value to the OAVP set point, and ad-  
justs the mixed-air dampers to the position required to achieve  
the configured velocity pressure.  
If a control routine (other than OAC) or the configured  
minimum damper position require the dampers to be more  
fully open than the OAC setting, that routine or position over-  
rides the OAC control. To protect against coil freeze-up in  
colder climates, the PIC provides selectable low tempera-  
ture protection to limit the minimum mixed-air temperature  
to approximately 45 F.  
ELECTRIC HEATER CONTROL — Electric heater stag-  
ing regulates the electric heater. The heater is staged to pre-  
vent the space temperature from falling below the desired  
set point. (The number of heat stages is factory set for each  
unit’s heater.)  
If the supply fan is OFF, all stages of electric heat are  
turned off.  
See Fig. 79 for OAC control flowchart.  
99  
HEATING COIL CONTROL — The heating coil control ad-  
justs the steam or hot water valve. Heat is primarily used for  
morning warm-up or Occupied Heating with the valve modu-  
lated to maintain desired return-air temperature.  
If the supply fan is OFF, the heating valve is modulated  
to maintain a desired minimum duct temperature (fan off value).  
If the fan is ON, the system determines if it is in the morn-  
ing warm-up mode. If it is, the return-air sensor is read and  
compared to the Occupied Heating set point. If heating is  
required, the control calculates the supply-air temperature  
required to satisfy conditions.  
Once the required supply-air temperature has been cal-  
culated, it is compared to the actual supply-air temperature  
and the heating coil valve modulates to the required  
position.  
FAN VOLUME CONTROL — Fan volume control adjusts  
the inlet guide vanes or inverter in a VAV system. The return  
fan IGVs or inverters are modulated to maintain a constant  
differential cfm value between the supply and return fans in  
the system.  
If the supply fan is OFF, the return fan inlet guide vanes  
are closed and no signal is sent to the return fan inverter.  
If the supply fan is ON, the control reads the supply fan  
differential pressure transmitter and computes the supply cfm.  
The desired return cfm is calculated by subtracting the dif-  
ferential cfm set point from the calculated supply cfm. The  
return cfm is read and the return fan differential pressure re-  
quired to satisfy conditions is calculated.  
The calculated return fan differential pressure is com-  
pared to the current differential pressure. The signal required  
to satisfy conditions is sent to the return fan inlet guide vane  
actuator or return fan inverter.  
The heat interlock relay is energized whenever there is a  
need for heat.  
DIRECT EXPANSION COOLING CONTROL — The di-  
rect expansion (DX) cooling control regulates the DX cool-  
ing system. The DX cooling stages are energized and deen-  
ergized to maintain the desired supply-air temperature set  
point. Whenever the system is in Nighttime Free Cooling  
mode or whenever the supply fan is off, the DX cooling stages  
remain off.  
Once morning warm-up is completed, heat is activated again  
unless Occupied Heat has been selected.  
During cooling or fan-only operation, heat can also be pro-  
vided to maintain the supply-air temperature when the amount  
of cold outside air admitted by the IAQ or OAC controls  
causes the temperature to fall below the supply-air set point.  
If the supply fan is on, the control reads the humidity sen-  
sor (if supplied) and compares the value to the high humid-  
ity limit. If the humidity is higher than the high humidity  
limit, the DX cooling stages are energized to maintain a mini-  
mum supply-air temperature. If the humidity is below the  
limit, the control reads the space temperature sensor and com-  
putes the supply-air temperature required to satisfy  
conditions.  
Once the required supply-air temperature has been cal-  
culated, it is compared to the actual supply-air temperature  
and the required DX cooling stages are energized to main-  
tain the desired conditions.  
CHILLED WATER COIL COOLING CONTROL — The  
cooling coil control adjusts the chilled water valve. The valve  
is modulated to maintain desired supply-air temperature set  
point. The valve is held in its normal position whenever the  
system is in Nighttime Free Cooling or whenever the supply  
fan is OFF.  
If the fan is ON, the control reads the humidity sensor and  
compares the value to the high humidity limit.  
If the humidity is higher than the humidity limit, the chilled  
water valve fully opens.  
If the humidity is below the high humidity limit, or if no  
humidity sensor is supplied, the control reads the supply-air  
sensor and computes the supply-air temperature required to  
satisfy conditions, provided that return-air temperature is greater  
than the Occupied Cooling set point.  
Once the required supply-air temperature has been cal-  
culated, it is compared to the current supply-air temperature  
and the chilled water valve modulates to the position re-  
quired to maintain desired conditions.  
See Fig. 77 for cooling operation and Fig. 78 for DX sub-  
master gain operation. For more complete information, refer  
to the Application Data book for Product Integrated  
Controls with DX Cooling  
ELECTRIC HEATER CONTROL — Electric heater stag-  
ing regulates the electric heater. The heater is primarily used  
for morning warm-up or Occupied Heating, with the heater  
staged to maintain desired return air temperature. (The num-  
ber of heat stages is factory set for each unit heater.)  
See Fig. 77 for cooling operation flowchart.  
STATIC PRESSURE CONTROL — The static pressure con-  
trol adjusts the inlet guide vanes (IGVs) or the supply-fan  
motor inverter in a variable air volume system in order to  
maintain the duct static pressure set point.  
If the supply fan is OFF, the IGVs remain closed or the  
minimum signal is sent to the inverter.  
If the fan is ON, the system reads the duct static pressure  
sensor and computes the static pressure required to satisfy  
conditions. The system compares the duct static pressure to  
the computed value and calculates the required signal that is  
output to the IGV actuator or the inverter.  
If the supply fan is OFF, all stages of electric heat are  
turned off.  
If the fan is ON, the control determines if the system is in  
morning warm-up. If it is, the return-air sensor is read and  
compared to the Occupied Heating set point. If heat is re-  
quired, the control calculates the supply-air temperature re-  
quired to satisfy conditions.  
Once the required supply-air temperature has been cal-  
culated, it is compared to the supply-air temperature to de-  
termine the number of heat stages required to satisfy con-  
ditions. The required stages are energized sequentially with  
2-second intervals between stages and the heat interlock re-  
lay is energized. For VAV units, the number of stages turned  
on is limited by the PIC IGV output.  
Once the morning warm-up is completed, heat is not ac-  
tivated again unless OCCUPIED HEAT has been selected.  
100  
LEGEND  
OA  
Outside Air  
OAC  
OAVP  
VAV  
Constant Outside Air  
Outside Air Velocity Pressure  
Variable Air Volume  
Fig. 79 — Constant Outside Air (OAC) Control Operation  
101  
SPACE TEMPERATURE RESET — The space tempera-  
ture reset is used to reset the supply-air temperature set point  
upward as the space temperature falls below the Occupied  
Cooling set point. As space temperature falls below the cool-  
ing set point, the space temperature is reset upward as a func-  
tion of the reset ratio. The reset ratio is the degrees of change  
in supply-air temperature per degree of space temperature  
change. A reset limit specifies the maximum number of de-  
grees the supply-air temperature may be raised. Both the re-  
set ratio and the reset limits are user adjustable.  
When the fan is ON, and the system is in the Occupied  
mode, the control reads the space temperature sensor and  
computes the reset value. If the reset value is greater than  
the reset limit, the control uses the reset limit as the reset  
value. The modified supply air temperature set point is de-  
termined by adding the reset value to the configured supply  
air temperature set point. This value is then used by the cool-  
ing coil algorithm.  
loadshed command is cleared by the Loadshed option, the  
control clears the loadshed command itself and returns  
to normal control. The loadshed timer is factory set at  
60 minutes.  
MIXED-AIR DAMPER CONTROL — The mixed-air damper  
control modulates the outside-air, return-air, and exhaust-air  
dampers. When outside-air conditions are unsuitable for at-  
mospheric cooling, the dampers are held at the minimum ad-  
justable outside-air position. The mixed-air dampers are  
modulated to maintain a mixed-air temperature equal to supply-  
air temperature set point minus 3° F. The dampers can also  
be modulated to maintain a user-configured mixed-air tem-  
perature set point.  
If the supply fan is OFF, the mixed-air dampers are held  
closed to outside air and held open to return air. If the supply  
fan is ON, and the system is not in the HEAT mode, the  
system determines if outside-air conditions are suitable for  
atmospheric cooling. The outside-air temperature is com-  
pared to the space temperature. If the outside-air tempera-  
ture is less than the space temperature, the system performs  
either an enthalpy check using an outside-air enthalpy switch  
or a differential enthalpy check.  
TWO-STEP DEMAND LIMITING (Available on Units  
Connected to the Carrier Comfort Network Only) — If the  
Demand Limit option is enabled, the control receives and  
accepts redline alerts and loadshed commands from the Net-  
work Loadshed option. See the CCN Loadshed manual for  
additional information.  
When a redline alert is received, the system limits the maxi-  
mum volume (percent of fully open IGVs) per the user-  
defined demand limit no. 1 set point.  
If the outside conditions are suitable, the control uses the  
mixed-air sensor to maintain the discharge temperature (when-  
ever the mixed-air sensor option is installed). If the sensor  
is not provided or fails, the control uses the supply-air sen-  
sor to modulate the dampers and achieve the set point.  
When a loadshed command is received, the maximum vol-  
ume is limited per the user-defined demand limit no. 2 set  
point.  
The maximum loadshed timer prevents the system from  
remaining in Loadshed, if the control loses communications  
with the Loadshed option. If the timer expires before the  
When the outside temperature is less than 40 F, the mixed-  
air damper opening rate is limited to 5% per minute to pro-  
tect against nuisance low temperature thermostat tripping and  
coil freeze-up. Rate limiting is off when the dampers are closed.  
102  
START-UP  
Initial Check  
Unit is shipped with the NTFC, Demand Limit, Tem-  
perature Reset, Optimal Start, Occupied Heating, and  
Fan Tracking functions disabled. If these functions are  
desired, refer to Control Operation, Programming Func-  
tions section beginning on page 81.  
IMPORTANT: Do not attempt to start unit, even mo-  
mentarily, until the following steps have been com-  
pleted.  
1. Verify unit has been installed per the Installation, Start-  
Up, and Service Instructions shipped inside the unit.  
2. Verify that all auxiliary components (valves, sensors, etc.)  
have been installed and wired to the PIC control box.  
3. Verify that the motor starter and HOA switch have been  
installed and wired.  
9. Check tightness of all electrical connections.  
10. Turn on control power by turning the ON/OFF switch  
located in the PIC control box to ON.  
11. Perform Quick Test to make sure controls are operating  
properly. See the following section.  
Quick Test — The Quick Test feature allows the service  
technician to individually test all inputs and outputs of the  
control system. See Tables 18-22.  
The test function operates the Quick Test diagnostic pro-  
gram. The test subfunctions energize the valves, dampers,  
and inlet guide vanes (VAV units).  
To start Quick Test, set HOA switch to OFF. Verify sup-  
ply fan stops. Quick Test does not operate if supply fan sta-  
tus is ON.  
NOTE: HOA switch must be in OFF position.  
4. Check to be sure area around unit is clear of construc-  
tion dirt and debris.  
5. On VAV units, verify that the static pressure probe and  
associated piping have been installed.  
6. Verify that:  
Chilled water valve is in its normal position.  
Hot water/steam valve is in its normal position.  
Outside-air damper is closed.  
Return-air damper is open.  
Inlet guide vanes are closed (VAV units).  
A test can be terminated by pressing  
. Pressing  
af-  
ter a test has started advances the system to the next test.  
Once the next test is displayed you can start the test by  
7. Set control configurations. Units are shipped with ap-  
plicable controls programmed to the default values shown  
in Table 16.  
8. Set unit set points. Units are shipped with the set point  
default values shown in Table 17. If a different set point  
is required, change as shown in the following example:  
pressing  
, advance past it by pressing  
, or back up  
by pressing  
. The unit remains in Quick Test until  
are pressed. At that time the unit  
and then  
reverts to automatic control.  
If the keyboard is not used for 10 minutes, the display  
automatically returns to the rotating default display. You  
KEYBOARD  
ENTRY  
DISPLAY  
COMMENTS  
RESPONSE  
must press  
and  
to exit Quick Test and then  
SETPOINT System set points  
press to restart the procedure.  
OHSP 68.0 Present occupied heat set point  
is 68.0  
OHSP 59.0 Key in 59 and press ENTR, display  
shows new occupied heat set point  
is 59  
OCSP 78.0 Present occupied cooling set point  
is 78.0  
OCSP 70.0 Key in 70 and press ENTR, display  
shows new occupied cooling set  
point is 70  
103  
Table 18 — Test of Input Signals  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS/ACTION  
INPUTS  
SAT X  
OAT X  
SPT X  
RAT X  
ENT X  
Field testing of inputs (X = current value. All temperatures should be Ϯ 2 degrees F from actual)  
Verify that the supply-air temperature sensor reading agrees with the actual temperature.  
Verify that the outdoor-air temperature sensor reading agrees with the actual temperature.  
Verify that the space temperature sensor reading agrees with the actual temperature.  
Verify that the return-air temperature sensor reading agrees with the actual temperature.  
Verify proper enthalpy reading. Move the knob on the enthalpy switch from A to D (or D to A) and verify that  
the display readout changes.  
SFS OFF  
SFS ON  
Verify that the supply fan status is OFF when the supply fan is OFF.  
Verify that the supply fan status is ON when the supply fan is ON. (Unit may be started by placing the HOA  
switch in the HAND position.)  
FRZ NRM  
SP 0.0  
Verify that the low limit thermostat reads Normal. If not, reset the low limit thermostat.  
Verify that the static pressure reads 0.0 in. wg with the fan OFF and HOA switch set at OFF (VAV units).  
Listed below are steps which must be used to verify different options. If the unit is not equipped with MAT, RH, OARH, or FLTS, proceed with the  
testing of the inputs to the Option Module. If the unit is equipped with any of these options, proceed with their respective testing as follows. If  
an option is not present, press  
for the next available option.  
Verify that the relative humidity reading agrees with the actual relative humidity, checked with the local weather  
bureau.  
RH XX  
MAT X  
Verify that the mixed-air temperature sensor reading agrees with the actual temperature.  
Verify that the outdoor-air relative humidity reading agrees with the actual relative humidity, checked with the  
local weather bureau.  
OARH XX  
FLTS NRM  
Verify that the filter status reads Normal.  
Listed below are steps which must be used to verify the inputs to the Option Module. If the unit is not equipped with the Option Module, proceed  
with the testing of the outputs (Table 19). If the unit is equipped with the Option Module, proceed with the testing as follows. If an option  
is not present, press  
for the next available option.  
TEMP X  
Verify that the temperature sensor reading agrees with the actual temperature measured.  
RVP X  
Verify that the return velocity pressure is 0 with the return fan OFF.  
Verify that the supply velocity pressure is 0 with the supply fan OFF.  
SVP X  
Verify that the duct high humidity switch reads Normal when the adjustment knob is set to the maximum set  
point or contacts are open. Verify that it reads ALM when contacts are shorted.  
DHH NRM  
EVAC NRM  
PRES NRM  
PURG NRM  
At Terminal Block 3, short Terminals 5 and 8. Verify that the display changes to EVAC ALM. Verify the  
following:  
• Supply fan is OFF  
• Outside and return dampers (if applicable) close  
• Exhaust damper (if applicable) opens  
• Return fan starts  
• Supply fan inlet guide vanes close (VAV units only)  
• Return fan inlet guide vanes open (VAV units equipped with return fans)  
• Heat interlock Relay is OFF (VAV units)  
At Terminal Block 3, short Terminals 3 and 8. Verify that the display changes to PRES ALM. Verify the  
following:  
• Supply fan is ON  
• Outside air damper (if applicable) opens  
• Exhaust and return dampers (if applicable) close  
• Return fan stops  
• Supply fan inlet guide vanes open (VAV units)  
• Return fan IGVs close (VAV units equipped with return fan)  
• Heat Interlock Relay is ON (VAV units)  
At Terminal Block 3, short Terminals 4 and 8. Verify that the display changes to PURG ALM. Verify the  
following:  
• Supply fan is ON  
• Outside air and exhaust dampers (if applicable) open  
• Return damper (if applicable) closes  
• Return fan is ON  
• Supply fan IGVs open (VAV units)  
• Return fan IGVs open (VAV units equipped with return fan)  
• Heat Interlock Relay is ON (VAV units)  
104  
Table 18 — Test of Input Signals (cont)  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS/ACTION  
FSD NRM  
At Terminal Block 3, short Terminals 1 and 2. Verify that the display changes to FSD ALM. Verify the  
following:  
• Supply fan is OFF  
• Outside air and exhaust dampers (if applicable) close  
• Return fan is OFF  
• Supply fan IGVs close (VAV units)  
• Return fan IGVs close (VAV units equipped with return fan)  
• Heat Interlock relay is OFF (VAV units)  
MTR XXX  
If applicable, verify that the display increments following the connected pulse-type meter measuring power.  
Verify that the velocity pressure reads 0.00 in. wg with the fan OFF and the mixed-air damper closed  
(0 setting).  
OAVP 0.00  
AQ1 XXX  
AQ2 XXX  
CUST EN  
Verify the displayed value using field-supplied instrumentation located near the sensor.  
Verify the displayed value using field-supplied instrumentation located near the sensor.  
Verify condensing unit lockout operation by rotating thermostat so display changes to CUST DSB. Reverse  
thermostat to change setting back to CUST EN and reenable unit.  
DXSD NRM  
Verify that the direct expansion cooling shutdown value is normal.  
Proceed with the testing of the outputs options (Table 19).  
LEGEND  
HOA  
IGV  
VAV  
Hands/Off/Automatic  
Inlet-Guide Vane  
Variable Air Volume  
105  
Table 19 — Test of Output Signals  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS/ACTION  
OUTPUTS  
HCV %  
Field testing of outputs. (Set HOA switch to OFF.)  
Press ENTR if unit is equipped with a hot water or steam valve. Otherwise press  
Verify that the hot water or steam valve strokes to its 100% position.  
HCV TEST  
The hot water or steam valve returns to its 0% position. Press ENTR if unit is equipped with a chilled water  
valve. Otherwise press  
CCV %  
CCV TEST  
MIXD %  
Verify that the chilled water valve strokes to its 100% position.  
The chilled water valve returns to its 0% position. Press ENTR if unit is equipped with mixed-air dampers.  
Otherwise press  
Verify that the outdoor-air damper strokes to its 100% position. Proceed with the applicable Constant Volume  
or Variable Air Volume portion of the test.  
MIXD TEST  
For Constant Volume Units:  
If so equipped, verify that the outdoor-air damper returns to its 0% position. (Set the HOA switch  
to AUTO.)  
IGV %  
SF X  
Supply fan will be turned ON automatically. If unit is equipped with the Option Module, proceed with the  
Option Output portion of the test (Table 20). If the unit does not have an Option Module, proceed to the electric  
heater portion of the test (Table 21). If unit does not have an Option Module or electric heater, proceed as  
follows:  
FAN TEST  
EXIT TST  
TST CMPL  
Test is now complete. The unit is back under normal automatic control.  
For Variable Air Volume Units:  
IGV %  
If so equipped, verify that the outdoor-air damper returns to its 0% position.  
Verify that the IGVs stroke to their 100% position. Close the door of the fan section. Turn the HOA switch  
to AUTO.  
The IGVs return to their 0% position.  
The supply fan is turned ON automatically.  
The supply fan stops.  
IGV TEST  
SF X  
FAN TEST  
HIR X  
HIR TEST  
Using an ohmmeter across the HIR relay contacts (refer to component arrangement label for location), the  
reading should be less than 10 ohms. If the unit is equipped with the option module, proceed with the option  
output portion of the test (Table 20). If unit does not have an option module, proceed to the electric heater  
portion of the test (Table 21). If unit does not have an option module or electric heater, proceed as follows:  
EXIT TST  
TST CMPL  
Test is now complete. The unit is back under normal automatic control.  
106  
Table 20 — Test of Output Options Using Option Module  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS/ACTION  
RFVC X  
RFVCTEST  
Verify that the return fan IGVs stroke to their fully open position.  
The return fan IGVs should close.  
HUM1 %  
HUM1TEST  
Verify that the return fan IGVs, if so equipped, return to their fully closed position. If equipped with single- stage  
analog humidification control, verify that the modulating valve goes to its fully open position. If equipped with  
two stages of humidification, use an ohmmeter to verify that the reading across the 1st stage normally-open  
relay contacts is less than 10 ohms.  
HUM2 %  
Verify that the reading across the 1st stage normally-open relay contacts is greater than 1000 ohms.  
If equipped with two stages of humidification, use an ohmmeter to verify that the reading across the 2nd stage  
normally open relay contacts is less than 10 ohms.  
HUM2TEST  
If equipped with two stages of humidification, verify that the reading across the 2nd stage humidification nor-  
mally open relay contacts is greater than 100 ohms.  
AOTC %  
AOTCTEST  
DOTC X  
Verify that the analog device connected to this output strokes to its 100% position.  
Verify that the analog device connected to this output strokes to its 0% position.  
Using an ohmmeter, verify that the reading across the DOTC (Discrete Output Temperature Control) normally  
open relay contacts is less than 10 ohms.  
DOTCTEST  
Using an ohmmeter, verify that the reading across the DOTC normally open relay contacts is greater than 1000  
ohms.  
DTCC X  
DTCCTEST  
Using an ohmmeter, verify that the reading across the DTCC (Discrete Timeclock Control) normally open relay  
contacts is less than 10 ohms. Proceed with the testing of electric heat stages (Table 21). If the unit is not  
equipped with electric heat, exit the Quick Test mode as described below:  
EXIT TST  
TST CMPL  
Test is now completed. The unit is back under normal automatic control.  
Table 21 — Electric Heater Test  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS/ACTION  
NOTE: Only the configured number of stages are tested and appear on the display.  
Entering field test of electric heater. (Set the HOA switch to AUTO.)  
ELE HEAT  
EHS1 X  
The fan starts. If equipped, the IGVs open to 30%. After an 11-second delay, the 1st stage of heat is  
turned ON.  
STG1 TST  
EHS2 X  
The 1st stage of heat is turned OFF.  
STG2 TST  
EHS3 X  
After a 2-second delay, the 2nd stage of heat is turned ON.  
The 2nd-stage of heat is turned OFF.  
STG3 TST  
EHS4 X  
After a 2-second delay, the 3rd stage of heat is turned ON.  
The 3rd stage of heat is turned OFF.  
STG4 TST  
EHS5 X  
After a 2-second delay, the 4th stage of heat is turned ON.  
The 4th stage of heat is turned OFF.  
STG5 TST  
EHS6 X  
After a 2-second delay, the 5th stage of heat is turned ON.  
The 5th stage of heat is turned OFF.  
STG6 TST  
EHS7 X  
After a 2-second delay, the 6th stage of heat is turned ON.  
The 6th stage of heat is turned OFF.  
STG7 TST  
EHS8 X  
After a 2-second delay, the 7th stage of heat is turned ON.  
The 7th stage of heat is turned OFF.  
STG8 TST  
EXIT TST  
TST CMPL  
After a 2-second delay, the 8th stage of heat is turned ON.  
The fan and preceding stage of heat shut OFF.  
Test is complete. The unit is back under automatic control.  
107  
Table 22 — Direct Expansion (DX) Cooling Test  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS/ACTION  
NOTE: Only the configured number of stages are tested and appear on the display.  
Entering field test DX cooling coil. (Set the HOA switch to AUTO.)  
DX COOL  
DXS1 X  
The fan starts. If fan has IGVs, the IGVs open to 30%. After an 11-second delay, the 1st stage of DX cooling  
is turned ON.  
STG1 TST  
DXS2 X  
The 1st stage of DX cooling is turned OFF.  
STG2 TST  
DXS3 X  
After a 2-second delay, the 2nd stage of DX cooling is turned ON.  
The 2nd stage of DX cooling is turned OFF.  
STG3 TST  
DXS4 X  
After a 2-second delay, the 3rd stage of DX cooling is turned ON.  
The 3rd stage of DX cooling is turned OFF.  
STG4 TST  
DXS5 X  
After a 2-second delay, the 4th stage of DX cooling is turned ON  
The 4th stage of DX cooling is turned OFF.  
STG5 TST  
DXS6 X  
After a 2-second delay, the 5th stage of DX cooling is turned ON.  
The 5th stage of DX cooling is turned OFF.  
STG6 TST  
DXS7 X  
After a 2-second delay, the 6th stage of DX cooling is turned ON.  
The 6th stage of DX cooling is turned OFF.  
STG7 TST  
DXS8 X  
After a 2-second delay, the 7th stage of DX cooling is turned ON.  
The 7th stage of DX cooling is turned OFF.  
STG8 TST  
EXIT TST  
TST CMPL  
After a 2-second delay, the 8th stage of DX cooling is turned ON.  
The fan and preceding DX cooling stage shut OFF.  
Test is complete. The unit is back under automatic control.  
Table 23 — Digital DC Volt Meter vs  
Electronic Valve Actuator Field Test — The elec-  
1
DC Milliamp Meter  
trically operated valve actuators supplied with  
2-in. to  
114-in. valve assemblies are a hydraulic, linear-piston type.  
The actuators supplied with the 112-in. to 3-in. valve assem-  
blies are an electro-mechanical type. Both types of actuators  
contain a spring as part of the valve assembly. The spring  
returns the stem to its normal position whenever there is a  
loss of power or signal. Both actuators contain an internal  
solid-state drive which accepts a proportional 4 to 20 mA  
signal generated by the controller.  
An increase in signal proportionally extends the actuator  
shaft and pushes the valve stem down. A decrease in signal  
retracts the actuator shaft and lifts the valve stem up. Valve  
construction determines normal valve flow, either stem-up  
open, or stem-up closed. On 3-way mixing valves, stem-up  
allows flow from port B to port AB.  
Perform field test for actuator as follows:  
1. Verify actuator is powered by 24 vac at the WHITE/  
BLUE and BLACK actuator wires.  
2. Use a digital milliamp meter to verify the mA signal and  
proper polarity at the input signal leads, ϩRED and  
−GREEN. A digital volt meter with a minimum of 2-place  
accuracy may be used to determine signal value, see  
Table 23.  
3. Enter the heating coil valve or cooling coil valve Quick  
Test, retract the actuator shaft and completely lift valve  
stem.  
DC MILLIAMPS  
DC VOLTAGE  
4
8
12  
16  
20  
.33  
.57  
.99  
1.32  
1.65  
NOTE: The internal solid-state drives of the factory-supplied elec-  
tronic actuators impose a 82.5 ohm impedance to the signal current  
loop. Aproportional voltage, ranging from 0.33 vdc at 4 mAto to 1.65 vdc  
at 20 mA will be present.  
CONTROL LOOP CHECKOUT  
Checkout and adjustment of control loops should only  
be performed by certified Carrier Comfort Network tech-  
nicians. The following checkout procedure is offered as  
a guide and presumes the user has obtained basic knowl-  
edge of controls through CCN training.  
To Check Operation of Analog Outputs — The  
control algorithms of the 39L and 39NX use the master/  
submaster loop concept. The master loop monitors the mas-  
ter sensor (the sensor which tries to maintain the desired set  
point), and calculates the submaster reference required to do  
so. The submaster loop monitors the submaster sensor and  
controls the output to the controlled device. These algo-  
rithms require a number of gain values to function properly.  
The 39L and 39NX come with preset default values. How-  
ever, it may be necessary to adjust several of these values to  
achieve stable control. These values are submaster loop gain  
(SMG), submaster loop center value (SCV), master loop pro-  
portional gain (MPG) and, in some cases, master loop in-  
tegral gain (MIG).  
4. While still in Quick Test, press  
. The actuator shaft  
should extend completely, pushing valve stem down. Exit  
Quick Test procedure.  
108  
To verify or adjust submaster default values, perform the  
following for each controlled device (control loop):  
b. Observe the operation of the controlled device for a  
few minutes. If the device oscillates every few sec-  
onds around the forced value, then lower the SMG  
by small amounts until the output steadies. If the out-  
put to the device responds to a change in temperature  
in small increments, then increase the SMG in small  
amounts until the output steadies.  
NOTE: Do not be alarmed if the submaster sensor sta-  
bilizes at a value greater than or less than the forced  
value. This is termed the submaster droop offset and is  
normal.  
1. Verify that controlled devices (cooling coil valve [CCV],  
heating coil valve [HCV]) are properly piped and wired.  
2. Using the local interface device, force each controlled  
device fully open and fully closed. Make sure the ac-  
tuators move smoothly. Sticky or sloppy actuators result  
in poor control. They must be corrected, otherwise it may  
be impossible to obtain stable control.  
3. Verify that all appropriate energy sources are available:  
hot water, chilled water, steam, etc.  
4. Verify that the system is in the Occupied mode and the  
supply fan is running.  
9. It is not necessary to adjust the submaster loop center  
value, as the master loop will adjust the submaster ref-  
erence as required to satisfy its set point. However, it  
may be desirable to keep the submaster droop to a mini-  
mum. This is most often required for heating coil loops,  
(especially on steam coils where the control valve has a  
tendency to be oversized).  
5. Verify that the supply fan status indicates ON. If the fan  
status if OFF, the control algorithms hold the controlled  
devices at the failsafe position.  
6. Verify that all forces have been removed.  
If the submaster droop is too large, adjust the SCV as  
follows:  
7. Table 24 indicates recommended starting values for SMG,  
MPG, and MIG for constant volume and variable air vol-  
ume units. Verify that these values have been entered.  
8. Verify/adjust the SMG. If the SMG is too large, the loop  
tends to oscillate (hunt). If it is too small, the loop reacts  
too slowly.  
If the submaster droop is positive (actual value greater  
than reference value), the SCV should be decreased for  
HCV and IGV loops and increased for CCV and MIXD  
loops. If the submaster droop is negative (actual value  
less than reference value), the SCV should be increased  
for HCV and IGV loops and decreased for CCV and  
MIXD loops.  
Verify or adjust the SMG as follows:  
a. Using the local interface device, force the submaster  
reference of the control loop to a value above or be-  
low the actual sensor reading. Verify that the actua-  
tor responds correctly. If the actuator drives in the  
wrong direction, go to the submaster gain (SMG) for  
the control loop and reverse the sign of the gain. For  
example: If the submaster loop gain is 5.0, change it  
to −5.0.  
10. Once the submaster loop is adjusted, remove all forces  
and proceed with verification and adjustment of master  
loop.  
11. To check the master loop, create an error in the master  
loop. For example: Change the actual space temperature  
to a value less than the heating set point or greater than  
the cooling set point.  
Observe system (loop) response for 10 to 20 minutes to  
verify stable control. After 10 minutes if the output con-  
tinues to swing full open to full closed, lower the MPG  
and observe again. Do this until the loop operation is  
stable. After 10 minutes, if the loop does not seem to  
respond (little change in submaster reference), increase  
the MPG and observe again. Do this until stable opera-  
tion is achieved.  
Table 24 — Recommended Gain Starting Valves  
VALUE  
GAIN  
CV  
VAV  
HCV MPG  
8.0  
0.3  
−7.5  
8.0  
0.3  
−7.5  
8.0  
0.3  
−7.5  
0.3*  
1.5*  
HCV MIG  
HCV SMG†  
CCV MPG  
−7.5  
0.3*  
1.0*  
CCV MIG  
12. Once you are satisfied with loop operation, remove all  
forces which may have been initiated during this  
procedure.  
CCV SMG**  
MIXD MPG  
−7.5  
0.5*  
1.5*  
MIXD MIG  
MIXD SMG  
−7.5  
IGV MPG  
0.5  
5.0  
13. Repeat steps 1-12 until all loops have been checked.  
IGV SMG  
EH MPG  
8.0  
5.0  
1.0  
0.8  
−3.0  
100%  
2.0  
7.5  
8.0  
EH SMG  
5.0  
VALVE TROUBLESHOOTING  
PREHEAT/AO MPG  
PREHEAT/AO MIG  
PREHEAT/AO SMG†  
PREHEAT/AO SCV††  
RFVC MPG  
RFVC SMG  
HUM MPG  
0.3  
0.8  
General — To facilitate troubleshooting the valve, it may  
be necessary to disassemble the electronic actuator from the  
valve body.  
−3.0  
100%*  
0.5  
10.0  
2.0  
7.5  
1
All ⁄2-in. Through 114-in. Electric Hot Water/  
HUM SMG  
Steam Valve Assemblies — A high-temperature link-  
age extension is supplied to help insulate the hydraulic ac-  
tuator from heat. See Fig. 80. Mount valves so that valve  
stem is at a 35° to 45° angle from vertical. See Fig. 81.  
*Differs from default value; change the default value to obtain the  
recommended starting value shown.  
†Values shown are for normally-open valves. If normally-closed valves  
are used, see Step 8.  
**Values shown are for normally-closed valves. If normally-open valves  
are used, see Step 8.  
††Values shown are for normally-open valves. If normally-closed valves  
are used, subtract initial value specified from 100% to obtain the  
correct value. Example:  
100% − (SCV N.O.) = (SCV N.C.)  
100% − 100% = 0%  
109  
All 112-in. Through 3-in. Valve Assemblies  
(See Fig. 82) — To remove the electro-mechanical ac-  
tuator from the valve body, proceed as follows:  
To remove the actuator from the high-temperature valve  
linkage extension or from the 2-way normally-open valve  
mounting nut, proceed as follows:  
1. Secure the high-temperature linkage extension or  
158-in. valve mounting nut to prevent turning.  
2. Turn the actuator base (by hand) counterclockwise off the  
high-temperature linkage extension mating threads or off  
the mating threads of the valve mounting nut. Do not ex-  
ert force on the upper housing! If necessary, a 158-in. open-  
end wrench may be applied on the flats provided on the  
actuator base.  
3. Separate hydraulic actuator from linkage extension or valve  
mounting nut. On assemblies using the linkage exten-  
sion, retain the white spacer (now loose inside the ac-  
tuator base) for reassembly later.  
1. Electrically power the actuator by turning circuit breaker  
to ON. Using the local interface device, force an output  
of 10% (see Example 25), or enough to begin to move  
the valve stem down, releasing stem pressure. It may be  
necessary to slightly adjust the signal value up and down  
to create a rocking motion on the valve stem. This will  
permit easier connecting pin removal.  
2. Remove the 2 self-tapping screws that secure the actua-  
tor base to the linkage mounting bracket. Turn the power  
to OFF and remove actuator assembly.  
To reassemble the hydraulic actuator to the valve body:  
1. On valve assemblies equipped with high-temperature link-  
age extension, insert the white spacer inside the actuator  
base.  
2. Secure the high-temperature linkage extension or valve  
mounting nut to prevent turning.  
3. Turn the actuator base (by hand) clockwise onto the high-  
temperature linkage extension or valve mounting nut un-  
til secure. Do not exert force on the upper housing!  
If necessary, a 158-in. open-end wrench may be applied  
on the flats provided on the actuator base. The actuator  
may be rotated as desired to facilitate wiring  
connections.  
Fig. 82 — Valve Assemblies, 112-in. to 3-in.,  
Typical Linkages  
Example 25 — Forcing An Output  
KEYBOARD  
ENTRY  
DISPLAY  
COMMENTS  
System outputs  
RESPONSE  
OUTPUTS  
IGV %  
Scroll past Inlet Guide Vane  
status  
1
Fig. 80 — Valve Assemblies, 2-in. to 114-in.,  
MIXD %  
HCV %  
Scroll past Mixed-Air Damper  
status  
Typical Linkages  
Heating Coil Valve status  
HCV 10/FORCED Heating Coil Valve is forced  
10% (Display flashes  
continuously)  
HCV %  
10% force is removed from  
heating coil valve (Display  
stops flashing)  
NOTE: Electric heat and DX cooling stages cannot be forced. All  
other outputs under can be forced.  
Fig. 81 — Valve Mounting Angle  
110  
TO REASSEMBLE ACTUATOR TO VALVE BODY:  
Example 27 — Cooling Coil Valve Quick Test  
(2-Way Normally Closed)  
All 2-way normally-open valves:  
1. Push the valve stem completely down and close seat valve.  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
NOTE: It may be necessary to shut down the system pump  
to ensure valve stem is closed.  
OUTPUTS  
Entering factory test of outputs  
2. Loosen locknut and screw stem extension down fully on  
valve stem to adjust stem extension for proper closure.  
Scroll past heating coil valve test  
HCV %  
by pressing  
key  
3. Attach actuator to valve linkage mounting bracket and  
secure with self-tapping screws.  
4. Make all necessary electrical connections.  
5. Electrically power actuator by turning circuit breaker to  
ON. Turn HOA switch to OFF position. Perform the heat-  
ing coil valve quick test to stroke the actuator to its full  
extended position. See Example 26. Leave the unit in test  
mode and proceed to Step 6.  
6. Screw the stem extension up until its hole aligns with the  
hole in the actuator piston.  
CCV %  
Cooling coil valve test  
Cooling coil valve actuator piston  
extends (Insert connecting pin)  
CCV TEST  
EXIT TEST  
TST CMPL  
Exit factory test  
Test completed  
NOTE: For more complete instructions concerning the Quick Test pro-  
cedure, see Quick Test in the Start-Up section, pages 103-108.  
7. Screw the stem extension 2 full turns farther up into the  
actuator piston.  
CONTROL MODULE TROUBLESHOOTING  
8. While still in Quick Test, press  
to retract actuator  
piston and align holes to insert connecting pin. Exit  
Quick Test.  
To prevent electrical shock and equipment damage, turn  
off all power to the PIC control box before removing or  
replacing modules.  
9. Tighten the locknut against the stem extension.  
General — The processor module (PSIO master), option  
module (PSIO slave) and relay module (DSIO) all perform  
continuous diagnostic evaluations of the condition of the hard-  
ware. Proper operation of these modules is indicated by LEDs  
(light-emitting diodes). The PSIO LEDs are located on the  
top of the module, and the DSIO LEDs are on the front of  
the module. See Fig. 83.  
Example 26 — Heating Coil Valve Test  
(2-Way Normally Open)  
KEYBOARD  
ENTRY  
DISPLAY  
RESPONSE  
COMMENTS  
OUTPUTS  
HCV %  
Entering factory test of outputs  
Entering heating coil valve test  
RED STATUS LED — If the LED is blinking continuously  
at a one-second rate, the module is operating normally. If the  
LED is lighted continuously, there is a problem that may re-  
quire replacement of the module.  
If the red LED is off continuously, check the power sup-  
ply to the module. If there is no input power, check the fuses.  
If a fuse is blown, check for shorted wiring or for a non-  
functional module. If the fuses are not blown, check for a  
bad transformer or open secondary of the transformer.  
The hot water/steam valve strokes  
to 100%  
HCV TEST  
EXIT TST  
TST CMPL  
Exit Quick Test  
Test completed  
NOTE: For more complete instructions on the Quick Test procedure,  
see Quick Test in the Start-Up section, pages 103-108.  
GREEN COMMUNICATIONS LEDs — On a PSIO mod-  
ule, the green LED closest to the COMM connectors indi-  
cates the status of communications between modules. When  
used, the other green LED on the module indicates the status  
of external CCN communications.  
The green LED that indicates module communications should  
blink continuously whenever the power is on. If the green  
LED is not blinking, check the red LED. If the red LED is  
normal, check the module address switches as shown in  
Fig. 82. The correct addresses follow:  
All 2-way normally-closed and 3-way mixing valves:  
1. Raise the valve stem completely up and close valve seat.  
NOTE: It may be necessary to shut down the system pump  
to ensure valve stem is closed.  
2. Loosen locknut and screw stem extension down fully on  
valve stem to adjust stem extension for proper closure.  
3. Attach actuator to valve linkage mounting bracket and  
secure with self tapping screws. The actuator should be  
fully retracted with no power or signal present.  
4. Screw the stem extension up until its hole aligns with the  
hole in the actuator piston.  
5. Screw the stem extension down 2 full turns away from  
the actuator piston.  
6. Turn circuit breaker to ON. Electrically connect the ac-  
tuator. Using the cooling coil valve quick test, extend the  
actuator piston to align holes and insert the connecting  
pin. See Example 27. After inserting connecting pin, exit  
Quick Test.  
Processor Module (PSIO Master) — 01 (factory default)  
Option Module (PSIO Slave)  
High-Voltage Relay Module  
(DSIO for Electric Heat  
or DX Control)  
High-Voltage Relay Module  
(DSIOs for Electric Heat  
and DX Control)  
— 31  
— 19  
— 49  
If all of the preceding modules except the processor mod-  
ule indicate communication failure, check the COMM plug  
on the processor (PSIO master) module for proper seating  
and check the communications bus wiring as shown in  
Fig. 69 on page 65. If the condition persists even though  
plug connections and wiring are correct, replace the proces-  
sor module as described in the Module Replacement  
section.  
7. Tighten the locknut against the stem extension to secure  
to stem.  
111  
If only the PSIO slave or DSIO module indicate commu-  
nication failure, check the affected module for proper seat-  
ing. If the condition persists even though connections are  
correct, replace the module as described in the following  
section.  
Module Replacement (PSIO, DSIO) — The PSIO  
master module controls the standard unit functions, the PSIO  
slave module controls many optional functions, and the DSIO  
module controls electric heat and/or DX cooling. If the mod-  
ule LEDs are not blinking and the unit or features associated  
with the module do not work, the module may need to be  
replaced. Before replacing an inoperative module, check to  
ensure that:  
DSIO  
• The PIC control box power is on  
• Power at the processor module is between 18 and 24 vac  
• No fuses are blown  
• All connections are firmly in place  
If all of the preceding conditions exist, and the module  
LEDs are not blinking, the module needs to be replaced.  
Before replacing a processor (PSIO) module,store the con-  
figuration data from the old module on hard copy. The new  
processor module can be preconfigured or configured in the  
field.  
After obtaining a new module, field-replace the inopera-  
tive module as follows:  
1. Turn off all power to the fan motor starter and PIC con-  
trol box.  
COMMUNICATIONS  
LEDs  
To avoid electrical shock and equipment damage,  
always disconnect all power to the control box be-  
fore replacing PIC modules.  
STATUS LED  
2. Open the control box door.  
3. Refer to Fig. 5-7 for control box component arrange-  
ments. Disengage all connectors from the module.  
4. Use a screwdriver to remove the mounting screw  
securing the module to the control box. Remove the  
module.  
ADDRESS  
SELECTOR  
5. Install the replacement module and replace the mount-  
ing screw.  
6. Reinstall all connectors. Verify that each connector is in  
the correct location.  
7. Turn on the power to the PIC control box and motor  
starter.  
PSIO  
8. If you are replacing a PSIO master module that is not  
preconfigured, use the local interface device (HSIO) or  
Building Supervisor to reset the date and time and change  
the module’s default settings. The original PSIO master  
module was factory configured to match the unit in which  
it was shipped. A replacement PSIO master mod-  
ule must have the Factory Configuration (  
) de-  
faults changed in the field to match the configuration  
of the unit in which it is being installed. Other settings  
may also need to be reconfigured to match the unit con-  
figuration and/or the original module’s settings.  
9. Perform the Initial Check, run the Quick Test, and verify  
that the unit is operating correctly as described in the  
Start-Up section on page 103.  
Fig. 83 — Module Address Selector Switch  
and LED Locations  
10. Close the PIC control box door.  
112  
UNIT TROUBLESHOOTING  
PROBLEM  
POSSIBLE CAUSE  
PIC control is OFF  
CORRECTIVE ACTION  
Check for correct power or blown fuses (F2).  
Correct any deficiencies.  
Check LEDs on control module (PSIO). If LED is not solidly  
illuminated, check for loose connections. If all wires and  
connectors are secure, replace PSIO module as described  
on page 112.  
Faulty connections  
Verify control shows correct time. If incorrect, enter correct  
time.  
PIC control has incorrect time  
Verify HOA switch is in the AUTO position.  
Check low-temperature thermostat and high-pressure switch  
(VAV units only). Reset switches if necessary.  
Supply fan HOA switch in OFF position  
Safety controls are tripped  
Unit does not run  
PIC control left in Quick Test  
(Display shows Mode 38)  
Using the local interface device, exit Quick Test.  
Press 5 TEST, and then ENTR to exit.  
Verify that unit should be in the Demand Limit mode. If not,  
cycle power to PIC to release unit from Demand Limit  
mode.  
Unit is configured for and is currently  
in Demand Limit Mode (CV units only)  
Unit is in Smoke Evacuation or Fire Shut-  
down mode (Display shows 35 or 37)  
Verify that unit should be in one of these modes. If not,  
check for shorted input on Fire Shutdown or Evacuation.  
Minimum inverter set point too low  
(VAV units only)  
Adjust minimum to 20% at 4 mA signal and 100% at 20 mA  
signal.  
Check status of SFS (4 STAT). If SFS is OFF, check supply  
fan status switch for proper operation. Switch must be ON  
for heat coil to function properly.  
No fan status  
Check status of HCV (5 STAT). If HCV is forced, remove  
force and check operation.  
Heat coil valve (HCV) is forced closed  
NO hot water or steam available,  
no power if electric heat  
Check source and correct any problems found.  
Electric heater safety tripped  
Reset heater safety. Check for proper operation.  
Check for blown fuse (F6). Replace if necessary. If fuse  
is intact, check for proper connections. Check transformer  
output.  
No power to valve  
No heat  
Check for blown fuse (F5). Replace if necessary. If fuse  
is intact, check for proper connections. Check transformer  
output.  
No power to electric heater control  
Incorrect reading from space temperature sensor,  
supply-air temperature sensor, or return-air  
temperature sensor (VAV units)  
Check status of sensor readings for accuracy.  
Replace sensor if defective.  
Check configuration for proper heating set point and  
Submaster Gain (SMG). An improper SMG can cause the  
heating valve to be held closed.  
Configuration error  
Check status of HCV (5 STAT). If HCV is forced, remove  
force and check operation.  
Heat coil valve (HCV) is forced open  
Incorrect reading from space temperature sensor,  
supply-air temperature sensor, or return-air  
temperature sensor (VAV units)  
Check status of sensor readings for accuracy. Replace  
sensor if defective.  
Overheating  
Check configuration for proper heating set point and  
Submaster Gain (SMG). An improper SMG can cause the  
heating valve to be held open.  
Configuration error  
No fan status  
Check status of SFS (4 STAT). If status is OFF, check  
switch for proper operation. Supply fan status switch must  
be ON for cooling coil to function properly.  
Check status of CCV (5 STAT). If CCV is forced, remove  
force and check operation.  
Cooling coil valve (CCV) is forced closed  
No chilled water available  
Check source of chilled water. Correct any problems found.  
Check for blown fuse (F3). Replace if necessary. If fuse  
is intact, check for proper connections. Check transformer  
output.  
No cooling  
No power to cooling coil valve  
Incorrect reading from space temperature sensor,  
supply-air temperature sensor, or return-air  
temperature sensor (VAV units)  
Check status of sensor readings for accuracy. Replace  
sensor if defective.  
Check configuration for proper cooling set point and  
Submaster Gain (SMG). An improper SMG can cause the  
CCV to be held closed.  
Configuration error  
Check status of CCV (5 STAT). If CCV is forced, remove  
force and check operation.  
Cooling coil valve (CCV) is forced open  
Incorrect reading from space temperature sensor,  
supply-air temperature sensor, or return-air  
temperature sensor (VAV units)  
Check status of sensor readings for accuracy. Replace  
sensor if defective.  
Overcooling  
Check configuration for proper cooling set point and  
Submaster Gain (SMG). An improper SMG can cause the  
CCV to be held open.  
Configuration error  
LEGEND  
CV  
VAV  
Constant Volume  
Variable Air Volume  
113  
UNIT TROUBLESHOOTING (cont)  
PROBLEM  
POSSIBLE CAUSE  
CORRECTIVE ACTION  
Check status of SFS (4 STAT). If supply fan status switch is  
OFF, check switch for proper operation.  
No fan status  
Check status of MIXD (5 STAT). If MIXD is forced, remove  
force and check operation.  
Mixed-air dampers forced closed to outside air  
No power to damper actuator  
Check for blown fuse (F7). Replace if necessary. If fuse is  
intact, check for proper connections. Check transformer  
output.  
Mixed-air dampers  
will not operate  
Incorrect reading from space temperature sensor  
or supply-air temperature sensor  
Check status of sensor readings for accuracy. Replace sen-  
sors if defective.  
Check configuration for proper SMG and MDP (minimum  
damper position). If MDP is set to zero, then dampers will  
stay closed when enthalpy is unsuitable. An improper SMG  
can cause the MIXD to be held to the MDP setting. Check  
for proper damper set point. If damper set point is forced to  
incorrect value, remove force.  
Configuration error  
Check status of SFS (4 STAT). If SFS is OFF, check supply  
fan status switch for proper operation.  
No fan status  
Check status of IGV (5 STAT). If IGVs are forced, remove  
force and check operation.  
Inlet guide vanes (IGVs) forced closed  
Check for blown fuse (F4). Replace if necessary. If fuse is  
intact, check for proper connections. Check transformer for  
proper output.  
No power to IGV actuator(s)  
Unit not main-  
taining desired  
static pressure  
(VAV units only)  
Loose IGV linkage  
Check IGV linkage for tightness and proper adjustment.  
Check status of sensor reading for accuracy. If reading is  
in error, check for plugged sensing line and check sensor  
calibration. Replace sensor if defective.  
Incorrect reading from static pressure transducer  
Check configuration for proper static pressure set point.  
Also, check SMG. An improper SMG can cause the IGVs to  
be held closed.  
Configuration error  
IGVs forced open  
Check status of IGV (5 STAT). If IGVs are forced, remove  
force and check operation.  
High-Pressure Switch (HPS) is incorrectly set  
or defective  
Using squeeze bulb, check trip point of HPS. Adjust as re-  
quired. Check for plugged lines. Replace if defective.  
High-Pressure  
Switch keeps  
tripping unit  
Using local interface device and squeeze bulb with gage,  
verify static pressure reading is correct. Adjust or replace  
sensor as required.  
Static pressure sensor reads incorrectly  
Configuration error  
OFF (VAV only)  
Check configuration for proper static pressure set point.  
Check SMG. An improper SMG can cause the IGVs to be  
held open.  
Check fuses of specific actuator for function failure.  
Fuses are as follows:  
F1 — PSIO control module  
F2 — Power  
F3 — Cooling coil  
F4 — IGVs — supply fan  
F5 — DSIO or option module  
F6 — Heating coil  
F7 — Mixed-air dampers  
No power, blown fuse  
F8 — Smoke control or return-air damper  
F9 — Exhaust-air damper  
Individual  
actuators  
F10 — IGVs — return fan  
do not function  
F11 — 39NX sizes 74, 92; 2nd IGV actuator, supply fan  
F12 — 39NX sizes 74, 92; 2nd IGV actuator, return fan  
F13 — Preheat coil  
Using manufacturer’s instructions, correct and adjust  
linkage. Check operation.  
Linkage is jammed or binding  
No control signal  
Using Quick Test and a voltage meter set to measure cur-  
rent, verify that the proper control signal (4 to 20 mA) is be-  
ing sent to the actuator. Refer to wiring diagram for  
appropriate terminals.  
Using Control Loop Checkout procedure, page 108, adjust  
the SMG until the output steadies.  
Incorrect submaster gain  
Oscillating  
output  
(HCV, CCV, IGV,  
MIXD, etc.)  
Verify sensor reading. If reading is fluctuating, determine  
cause (i.e., loose connections, partially plugged static pres-  
sure sensing lines). Correct or replace sensor if necessary.  
Input sensor is fluctuating (supply-air  
temperature sensor, static pressure transducer)  
Loose connections  
Verify all connections are secure.  
Voltage type sensors (i.e., static pressure, space tempera-  
ture, outdoor-air temperature, return-air temperature, rela-  
tive humidity, and velocity pressure) can be calibrated using  
manufacturer’s instructions.  
Sensor  
not reading  
correctly  
Sensor out of calibration  
If a sensor cannot be calibrated and its reading is consid-  
ered unacceptable, replace sensor. Once sensor is re-  
placed, verify new sensor is reading correctly.  
Defective sensor  
114  
UNIT TROUBLESHOOTING (cont)  
PROBLEM  
POSSIBLE CAUSE  
CORRECTIVE ACTION  
OAC not enabled  
Enable OAC.  
Verify fan is operating and supply fan status is correct. Sup-  
ply fan status must be ON to allow OAC control.  
Fan status is OFF  
According to occupancy schedule, building  
is unoccupied  
Verify that current time and date are correct and reconfigure  
occupancy schedule.  
Change unit type to VAV (1). OAC not available for CV  
units.  
Incorrect unit type  
Verify 24 vac power at sensor input and correct voltage at  
sensor output. Verify that pneumatic tube from sensor to  
probe is unblocked and correctly connected to the probe.  
Verify that high-pressure side of probe faces the airflow.  
Correct problems as necessary.  
Constant outside air  
(OAC) malfunctioning  
Outside-air velocity pressure (OAVP) sensor  
not functioning  
Configure OAVP sensor for correct voltage and pressure  
output ranges.  
OAVP sensor not configured  
Verify above corrective action; adjust the probe multiplica-  
tion factor (PMF) so that the OAVP reading matches that  
of the measurement device. (OAVP value = sensor  
value/PMF).  
OAVP value does not match that of measure-  
ment equipment  
IAQ not enabled  
Enable IAQ.  
According to occupancy schedule, building is  
unoccupied  
Verify that current time and date are correct and reconfigure  
occupancy schedule.  
Verify that priority level is set at 1 or 2 and correct if  
necessary. (Level 3 provides no IAQ control, only alarm  
functions.)  
IAQ priority level is incorrect  
Set point too high  
Adjust set point to correct (lower) level.  
Ensure that power and control wiring are correct. Verify  
24 vac power at sensor input and correct voltage at sensor  
output.  
Air quality (AQ) sensors not operating  
Ensure that sensor voltage range and output values are  
correctly configured.  
AQ sensors not configured  
IAQ type set incorrectly  
Set IAQ type to 1 for a single sensor or two sensors used  
for differential comparison. Set IAQ type to 2 for two sen-  
sors used for separate readings.  
Indoor-air quality  
(IAQ) features  
malfunctioning  
IAQ functions suspended because priority level is  
2 and the conditions below apply:  
Space temperature is too high or too low  
Control will resume when space temperature recovers.  
Space relative humidity is greater than cooling  
coil high humidity limit (CCHHL)  
Ensure that CCHHL is set correctly. Control will resume  
when the relative humidity drops below CCHHL.  
For VAV units only; supply-air temperature  
(SAT) is greater than the sum of cooling coil  
master reference (CCMR) plus 5 F, or SAT is  
less than (CCMR−8 F) for 4 minutes or more  
Control will resume when SAT control recovers. This is nor-  
mal operation during conditions of high or low outside-air  
temperature (OAT)  
Normal operation will resume when the MAT sensor is oper-  
ating correctly or when OAT is greater than 45 F. If OAT is  
greater than 45 F, remove force from, repair, or replace the  
MAT sensor.  
Mixed-air temperature (MAT) sensor is forced,  
open, or shorted; OAT is less than 45 F;  
MAT protection is enabled  
115  
METRIC CONVERSION CHART  
Copyright 1996 Carrier Corporation  
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.  
Book 3  
PC 201  
Catalog No. 533-913  
Printed in U.S.A.  
Form 39L,NX-2SI  
Pg 116  
3-96  
Replaces: 39L,NX-1SI  
Tab 1b  

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