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 11⁄4-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 11⁄2-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 Unistrut support 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 (Underwriters’Labo-
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
11⁄2 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 1⁄2 to 11⁄4-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 (3⁄8-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 1⁄4 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 5⁄8-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 1⁄2-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 21⁄2 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 11⁄8-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 11⁄8-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 (Motormaster device),
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°
31⁄2 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 Guardா device
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 Guardா Device (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)
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ENTRY
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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)
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KEYBOARD
ENTRY
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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
11⁄4-in. valve assemblies are a hydraulic, linear-piston type.
The actuators supplied with the 11⁄2-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 11⁄4-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 11⁄2-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
15⁄8-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 15⁄8-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 15⁄8-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, 11⁄2-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 11⁄4-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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