York Predator 120 User Manual

INSTALLATION  
MANUAL  
SINGLE PACKAGE AIR CONDITIONERS AND  
SINGLE PACKAGE ELECTRIC UNITS  
DM090, 120 and 150  
CONTENTS  
7-1/2 TO 12-1/2 TON  
(380V, 3 Phase, 60 HZ)  
See following pages for a complete Table of Contents.  
NOTES, CAUTIONS AND WARNINGS  
The installer should pay particular attention to the words:  
NOTE, CAUTION, and WARNING. Notes are intended to  
clarify or make the installation easier. Cautions are given  
to prevent equipment damage. Warnings are given to alert  
installer that personal injury and/or equipment damage  
may result if installation procedure is not handled properly.  
CAUTION: READ ALL SAFETY GUIDES BEFORE YOU  
BEGIN TO INSTALL YOUR UNIT.  
SAVE THIS MANUAL  
035-17311-002-A-0803  
035-17311-002-A-0803  
LIST OF FIGURES  
Pg.# Fig. #  
Fig. #  
Pg.#  
4
®
PREDATOR COMPONENT LOCATION . . . . . . . . . 11  
®
11 PREDATOR ROOF CURB DIMENSIONS . . . . . . . . 15  
®
12 SUNLINE™ TO PREDATOR TRANSITION ROOF  
CURBS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
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035-17311-002-A-0803  
LIST OF TABLES  
Pg.# Tbl.#  
Tbl.#  
Pg.#  
8
20 10 TON OPTIONAL MOTOR DOWN SHOT  
21 12-1/2 TON STANDARD MOTOR DOWN SHOT  
22 12-1/2 TON OPTIONAL MOTOR DOWN SHOT  
23 7-1/2 TON STANDARD MOTOR SIDE SHOT  
BLOWER PERFORMANCE . . . . . . . . . . . . . . . . . . . 28  
24 7-1/2 TON OPTIONAL MOTOR SIDE SHOT  
ELECTRICAL DATA - DM090 (7-1/2 TON) WITHOUT  
25 10 TON STANDARD MOTOR DOWN SHOT  
9
ELECTRICAL DATA - DM090 (7-1/2 TON) WITH  
26 10 TON OPTIONAL MOTOR DOWN SHOT  
10 ELECTRICAL DATA - DM120 (10 TON) WITHOUT  
27 12-1/2 TON STANDARD MOTOR SIDE SHOT  
11 ELECTRICAL DATA - DM120 (10 TON) WITH POWER  
CONVENIENCE OUTLET . . . . . . . . . . . . . . . . . . . . . 20  
28 12-1/2 TON OPTIONAL MOTOR SIDE SHOT  
12 ELECTRICAL DATA - DM150 (12-1/2 TON) WITHOUT  
13 ELECTRICAL DATA - DM150 (12-1/2 TON) WITH  
34 7.5 TON STANDARD EFFICIENCY SUPERHEAT  
CHARGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37  
17 7-1/2 TON STANDARD MOTOR DOWN SHOT  
35 10 TON STANDARD EFFICIENCY SUPERHEAT  
18 7-1/2 TON OPTIONAL MOTOR DOWN SHOT  
36 12.5 TON STANDARD EFFICIENCY SUPERHEAT  
19 10 TON STANDARD MOTOR DOWN SHOT  
4
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GENERAL  
REFERENCE  
Additional information is available in the following reference  
forms:  
®
YORK Predator units are single package air conditioners  
designed for outdoor installation on a rooftop or slab and for  
non-residential use. These units can be equipped with factory  
or field installed electric heaters for heating applications.  
General Installation - DM090 - 150, 035-17311-002  
Pre-start & Post-start Check List - 035-18466-000  
These units are completely assembled on rigid, permanently  
attached base rails. All piping, refrigerant charge, and electri-  
cal wiring is factory installed and tested. The units require  
electric power and duct connections. The electric heaters  
have nickel-chrome elements and utilize single-point power  
connection.  
Economizer Accessory -  
Downflow Factory Installed, 035-18286-000  
Downflow Field Installed, 035-18285-000  
Horizontal Field Installed, 035-18287-000  
Motorized Outdoor Air Damper 035-18283-000  
Manual Outdoor Air Damper (0-100%) 035-18282-000  
Manual Outdoor Air Damper (0-35%) 035-18281-000  
Electric Heater Accessory 035-17291-001  
SAFETY CONSIDERATIONS  
Due to system pressure, moving parts, and electrical compo-  
nents, installation and servicing of air conditioning equipment  
can be hazardous. Only qualified, trained service personnel  
should install, repair, or service this equipment. Untrained  
personnel can perform basic maintenance functions of clean-  
ing coils and filters and replacing filters.  
Unit Renewal Parts List 035-17288-000  
All forms referenced in this instruction may be ordered from:  
Standard Register  
Toll Free Fax: (877) 379-7920  
Toll Free Phone: (877) 318-9675  
Observe all precautions in the literature, labels, and tags  
accompanying the equipment whenever working on air condi-  
tioning equipment. Be sure to follow all other applicable  
safety precautions and codes.  
APPROVALS  
Design certified by CSA as follows:  
Wear safety glasses and work gloves. Use quenching cloth  
and have a fire extinguisher available during brazing opera-  
tions.  
1. For use as a cooling only unit, cooling unit with supple-  
mental electric heat or a forced air furnace.  
2. For outdoor installation only.  
3. For installation on combustible material and may be  
installed directly on combustible flooring or, in the U.S.,  
on wood flooring or Class A, Class B or Class C roof cov-  
ering materials .  
INSPECTION  
As soon as a unit is received, it should be inspected for possi-  
ble damage during transit. If damage is evident, the extent of  
the damage should be noted on the carrier’s freight bill. A  
separate request for inspection by the carrier’s agent should  
be made in writing.  
This product must be installed in strict compliance  
with the enclosed installation instructions and any  
applicable local, state, and national codes including,  
but not limited to, building, electrical, and mechanical  
codes.  
This furnace is not to be used for temporary heating  
of buildings or structures under construction.  
Before performing service or maintenance opera-  
tions on unit, turn off main power switch to unit. Elec-  
trical shock could cause personal injury. Improper  
installation, adjustment, alteration, service or main-  
tenance can cause injury or property damage. Refer  
to this manual. For assistance or additional informa-  
tion consult a qualified installer, service agency.  
Incorrect installation may create a condition where the  
operation of the product could cause personal injury  
or property damage.  
The installer should pay particular attention to the words:  
NOTE, CAUTION, and WARNING. NOTES are intended to  
clarify or make the installation easier. CAUTIONS are given  
to prevent equipment damage. WARNINGS are given to alert  
installer that personal injury and/or equipment damage may  
result if installation procedure is not handled properly.  
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NOMENCLATURE  
6½ - 12½ Ton Predator Model Number Nomenclature  
D M 090 C00 A 3 A AA 3  
Product Generation  
Product Category  
3 = Third Generation  
D = Air Cond., Single Package  
Product Identifier  
Voltage  
Additional Options  
Installation Options  
M = R-22 Standard Efficiency  
A = No Options Installed  
B = Option 1  
C = Option 2  
(See Next Page)  
3 = 380-3-60  
D = Options 1 & 2  
E = Option 3  
F = Option 4  
Nominal Cooling Capacity - MBH  
090 = 7-½ Ton  
120 = 10 Ton  
150 = 12-½ Ton  
G = Options 1 & 3  
H = Options 1 & 4  
J = Options 1, 2 & 3  
K = Options 1, 2 & 4  
L = Options 1, 3 & 4  
M = Options 1, 2, 3 & 4  
N = Options 2 & 3  
P = Options 2 & 4  
Q = Options 2, 3 & 4  
R = Options 3 & 4  
S = Option 5  
Heat Type & Nominal Heat Capacity  
C00 = Cooling Only. Suitable for field installed electric heat  
Electric Heat Options  
T = Options 1 & 5  
U = Options 1, 3 & 5  
V = Options 1, 4 & 5  
W = Options 1, 3, 4 & 5  
X = Options 3 & 5  
Y = Options 4 & 5  
Z = Options 3, 4 & 5  
E09 = 9 kW Electric Heat  
E18 = 18 kW Electric Heat  
E24 = 24 kW Electric Heat  
E36 = 36 kW Electric Heat  
E54 = 54 kW Electric Heat  
Options  
1 = Disconnect  
2 = Non-Pwr’d Conv Outlet  
3 = Smoke Detector S. A.  
4 = Smoke Detector R. A.  
5 = Pwr’d Conv Outlet  
Airflow  
A = Standard Motor  
B = Standard Motor/Economizer/Barometric Relief (Downflow only)  
C = Standard Motor/Economizer/Power Exhaust (Downflow only)  
D = Standard Motor/Motorized Damper (Downflow only)  
E = Standard Motor/Horizontal Economizer (No Barometric Relief or Power Exhaust)  
F = Standard Motor/Slab Economizer/Power Exhaust (Downflow only)  
G = Standard Motor/Slab Economizer/Barometric Relief (Downflow only)  
L = Standard Motor/BAS Ready Econ (NoBASController)/Barometric Relief w/2" Pleated Filters (Downflow only)  
M = Standard Motor/BAS Ready Econ (NoBASController)/Power Exhaust w/2" Pleated Filters (Downflow only)  
N = High Static Motor  
P = High Static Motor/Economizer/Barometric Relief (Downflow only)  
Q = High Static Motor/Economizer/Power Exhaust (Downflow only)  
R = High Static Motor/Motorized Damper (Downflow only)  
S = High Static Motor/Horizontal Economizer (No Barometric Relief or Power Exhaust)  
T = High Static Motor/Slab Economizer/Power Exhaust (Downflow only)  
U =High Static Motor/Slab Economizer/Barometric Relief (Downflow only)  
Y = High Static Motor/BAS Ready Econ (NoBASController)/Barometric Relief w/2" Pleated Filters (Downflow only)  
Z = High Static Motor/BAS Ready Econ (NoBASController)/Power Exhaust w/2" Pleated Filters (Downflow only)  
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NOMENCLATURE, ADDITONAL OPTIONS:  
AA None  
AB Phase Monitor  
AC Coil Guard  
AD Dirty Filter Switch  
AE Phase Monitor & Coil Guard  
AF Phase Monitor & Dirty Filter Switch  
AG Coil Guard & Dirty Filter Switch  
AH Phase Monitor, Coil Guard, & Dirty Filter Switch  
CA CPC Controller with Dirty Filter Switch & Air Proving Switch  
CB CPC Controller, DFS, APS & Phase Monitor  
CC CPC Controller, DFS, APS & Coil Guard  
CD CPC Controller, DFS, APS, Phase Monitor, & Coil Guard  
CE CPC Controller, DFS, APS & Technicoat Cond. Coil  
CF CPC Controller, DFS, APS, Technicoat Cond. Coil, & Phase Monitor  
CG CPC Controller, DFS, APS, Technicoat Cond. Coil, & Coil Guard  
CH CPC Controller, DFS, APS, Technicoat Cond. Coil, Phase Monitor, & Coil Guard  
CJ CPC Controller, DFS, APS & Technicoat Evap. Coil  
CK CPC Controller, DFS, APS, Technicoat Evap. Coil, & Phase Monitor  
CL CPC Controller, DFS, APS, Technicoat Evap. Coil, & Coil Guard  
CM CPC Controller, DFS, APS, Technicoat Evap. Coil, Phase Monitor, & Coil Guard  
CN CPC Controller, DFS, APS & Technicoat Evap. & Cond Coils  
CP CPC Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Phase Monitor  
CQ CPC Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Coil Guard  
CR CPC Controller, DFS, APS, Technicoat Cond Coils, Phase Monitor, & 2” Pleated Filters  
CV CPC Controller, DFS, APS, & 2” Pleated Filters  
CX CPC Controller, DFS, APS, Technicoat Evap. & Cond Coils, Phase Monitor, Coil Guard  
HA Honeywell Excel 10 Controller with Dirty Filter Switch & Air Proving Switch  
HB Honeywell Excel 10 Controller, DFS, APS & Phase Monitor  
HC Honeywell Excel 10 Controller, DFS, APS & Coil Guard  
HD Honeywell Excel 10 Controller, DFS, APS, Phase Monitor, & Coil Guard  
HE Honeywell Excel 10 Controller, DFS, APS & Technicoat Cond. Coil  
HF Honeywell Excel 10 Controller, DFS, APS, Technicoat Cond. Coil, & Phase Monitor  
HG Honeywell Excel 10 Controller, DFS, APS, Technicoat Cond. Coil, & Coil Guard  
HH Honeywell Excel 10 Controller, DFS, APS, Technicoat Cond. Coil, Phase Monitor, & Coil Guard  
HJ Honeywell Excel 10 Controller, DFS, APS & Technicoat Evap. Coil  
HK Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. Coil, & Phase Monitor  
HL Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. Coil, & Coil Guard  
HM Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. Coil, Phase Monitor, & Coil Guard  
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035-17311-002-A-0803  
HN Honeywell Excel 10 Controller, DFS, APS & Technicoat Evap. & Cond Coils  
HP Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Phase Monitor  
HQ Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Coil Guard  
HR Honeywell Excel 10 Controller, DFS, APS, Technicoat Evap. & Cond Coils, Phase Monitor, & Coil Guard  
JA Johnson UNT Controller with Dirty Filter Switch & Air Proving Switch  
JB Johnson UNT Controller, DFS, APS & Phase Monitor  
JC Johnson UNT Controller, DFS, APS & Coil Guard  
JD Johnson UNT Controller, DFS, APS, Phase Monitor, & Coil Guard  
JE Johnson UNT Controller, DFS, APS & Technicoat Cond. Coil  
JF Johnson UNT Controller, DFS, APS, Technicoat Cond. Coil, & Phase Monitor  
JG Johnson UNT Controller, DFS, APS, Technicoat Cond. Coil, & Coil Guard  
JH Johnson UNT Controller, DFS, APS, Technicoat Cond. Coil, Phase Monitor, & Coil Guard  
JJ  
JK Johnson UNT Controller, DFS, APS, Technicoat Evap. Coil, & Phase Monitor  
JL Johnson UNT Controller, DFS, APS, Technicoat Evap. Coil, & Coil Guard  
Johnson UNT Controller, DFS, APS & Technicoat Evap. Coil  
JM Johnson UNT Controller, DFS, APS, Technicoat Evap. Coil, Phase Monitor, & Coil Guard  
JN Johnson UNT Controller, DFS, APS & Technicoat Evap. & Cond Coils  
JP Johnson UNT Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Phase Monitor  
JQ Johnson UNT Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Coil Guard  
JR Johnson UNT Controller, DFS, APS, Technicoat Evap. & Cond Coils, Phase Monitor, & Coil Guard  
NA Novar ETC-3 Controller with Dirty Filter Switch & Air Proving Switch  
NB Novar ETC-3 Controller, DFS, APS & Phase Monitor  
NC Novar ETC-3 Controller, DFS, APS & Coil Guard  
ND Novar ETC-3 Controller, DFS, APS, Phase Monitor, & Coil Guard  
NE Novar ETC-3 Controller, DFS, APS & Technicoat Cond. Coil  
NF Novar ETC-3 Controller, DFS, APS, Technicoat Cond. Coil, & Phase Monitor  
NG Novar ETC-3 Controller, DFS, APS, Technicoat Cond. Coil, & Coil Guard  
NH Novar ETC-3 Controller, DFS, APS, Technicoat Cond. Coil, Phase Monitor, & Coil Guard  
NJ Novar ETC-3 Controller, DFS, APS & Technicoat Evap. Coil  
NK Novar ETC-3 Controller, DFS, APS, Technicoat Evap. Coil, & Phase Monitor  
NL Novar ETC-3 Controller, DFS, APS, Technicoat Evap. Coil, & Coil Guard  
NM Novar ETC-3 Controller, DFS, APS, Technicoat Evap. Coil, Phase Monitor, & Coil Guard  
NN Novar ETC-3 Controller, DFS, APS & Technicoat Evap. & Cond Coils  
NP Novar ETC-3 Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Phase Monitor  
NQ Novar ETC-3 Controller, DFS, APS, Technicoat Evap. & Cond Coils, & Coil Guard  
NR Novar ETC-3 Controller, DFS, APS, Technicoat Evap. & Cond Coils, Phase Monitor, & Coil Guard  
TA Technicoat Condenser Coil  
TB Technicoat Condenser Coil & Phase Monitor  
TC Technicoat Condenser Coil & Coil Guard  
TD Technicoat Condenser Coil & Dirty Filter Switch  
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035-17311-002-A-0803  
TE Technicoat Condenser Coil, Phase Monitor, & Coil Guard  
TF Technicoat Condenser Coil, Phase Monitor, & Dirty Filter Switch  
TG Technicoat Condenser Coil, Coil Guard, & Dirty Filter Switch  
TH Technicoat Condenser Coil, Phase Monitor, Coil Guard, & Dirty Filter Switch  
TJ Technicoat Evaporator Coil  
TK Technicoat Evaporator Coil & Phase Monitor  
TL Technicoat Evaporator Coil & Coil Guard  
TM Technicoat Evaporator Coil & Dirty Filter Switch  
TN Technicoat Evaporator Coil, Phase Monitor, & Coil Guard  
TP Technicoat Evaporator Coil, Phase Monitor, & Dirty Filter Switch  
TQ Technicoat Evaporator Coil, Coil Guard, & Dirty Filter Switch  
TR Technicoat Evaporator Coil, Phase Monitor, Coil Guard, & Dirty Filter Switch  
TS Technicoat Evaporator & Condenser Coils  
TT Technicoat Evaporator & Condenser Coils & Phase Monitor  
TU Technicoat Evaporator & Condenser Coils & Coil Guard  
TV Technicoat Evaporator & Condenser Coils & Dirty Filter Switch  
TW Technicoat Evaporator & Condenser Coils, Phase Monitor, & Coil Guard  
TX Technicoat Evaporator & Condenser Coils, Phase Monitor, & Dirty Filter Switch  
TY Technicoat Evaporator & Condenser Coils, Coil Guard, & Dirty Filter Switch  
TZ Technicoat Evaporator & Condenser Coils, Phase Monitor, Coil Guard, & Dirty Filter Switch  
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035-17311-002-A-0803  
INSTALLATION  
INSTALLATION SAFETY INFORMATION  
Read these instructions before continuing this appliance  
installation. This is an outdoor combination heating and cool-  
ing unit. The installer must assure that these instructions are  
made available to the consumer and with instructions to  
retain them for future reference.  
1. Install this furnace only in a location and position as  
specified on Page 11 of these instructions.  
2. This equipment is not to be used for temporary heating  
of buildings or structures under construction.  
PRECEDING INSTALLATION  
Toolless  
Doorknobs  
1. Remove the two screws holding the brackets in the front,  
rear and compressor side fork-lift slots.  
Installation  
Instruction  
Packet  
Bracket  
Turn down  
Screws  
FIGURE 3 - COMPRESSOR SECTION  
LIMITATIONS  
FIGURE 1 - UNIT SHIPPING BRACKET  
These units must be installed in accordance with the follow-  
ing:  
2. Turn each bracket toward the ground and the protective  
plywood covering will drop to the ground.  
In U.S.A.:  
3. Remove the condenser coil external protective covering  
prior to operation.  
1. National Electrical Code, ANSI/NFPA No. 70 - Latest  
Edition  
4. Remove the toolless doorknobs and instruction packet  
prior to installation.  
2. Local building codes, and  
3. Local plumbing and waste water codes, and  
4. Other applicable local codes.  
Condenser  
Coil External  
Protective  
Covering  
Refer to Tables 1 & 2 for unit application data.  
If components are to be added to a unit to meet local codes,  
they are to be installed at the dealer’s and/or customer’s  
expense.  
Barometric  
Relief Hood in  
Shipping Loca-  
tion (if included)  
Size of unit for proposed installation should be based on heat  
loss/heat gain calculation made according to the methods of  
Air Conditioning Contractors of America (ACCA).  
FIGURE 2 - CONDENSER COVERING  
10  
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035-17311-002-A-0803  
Simplicity™ Control board  
w/screw connector  
Disconnect location  
(optional disconnect switch)  
for T-stat wiring and  
network connection  
Filter access (2” throw-away)  
Terminal block for  
hi-voltage connection  
Filter drier (solid  
core)  
Condenser  
section  
Second model name-  
plate inside hinged  
access panel  
Belt-drive  
blower motor  
Slideout motor  
& blower  
assembly for  
easy access  
adjustment &  
service  
Dual stage  
cooling for  
max. comfort  
Compressor #2  
access (high-  
efficiency com-  
pressor with  
Compressor #1 access (high-  
efficiency compressor w/  
crankcase heater))  
crankcase heater  
Slide-out drain pan  
with steel 3/4” FPT  
connection  
Base rails w/fork-  
lift slots (3 sides)  
and lifting holes)  
Roof curbs in eight- and fourteen-inch  
heights. Roof curbs for transitioning from  
York Sunline™ footprint to the DM  
Series footprint are also available  
(field-installed accessory)  
Side entry power  
and control wiring  
knockouts  
Tool-less door  
latch  
FIGURE 4 - PREDATOR® COMPONENT LOCATION  
TABLE 1: UNIT VOLTAGE LIMITATIONS  
4. For ground level installation, use a level concrete slab  
with a minimum thickness of 4 inches. The length and  
width should be at least 6 inches greater than the unit  
base rails. Do not tie slab to the building foundation.  
Power Rating  
Minimum  
Maximum  
380  
350  
418  
5. Roof structures must be able to support the weight of the  
unit and its options/accessories. Unit must be installed  
on a solid, level roof curb or appropriate angle iron  
frame.  
TABLE 2: UNIT TEMPERATURE LIMITATIONS  
Temperature  
Min.  
Max.  
6. Maintain level tolerance to 1/2” across the entire width  
and length of unit.  
Wet Bulb Temperature (°F) of Air on  
57  
72  
Evaporator Coil  
RIGGING AND HANDLING  
Dry Bulb Temperature (°F) of Air on  
0*  
125  
Condenser Coil  
Exercise care when moving the unit. Do not remove any  
packaging until the unit is near the place of installation. Rig  
the unit by attaching chain or cable slings to the lifting holes  
provided in the base rails. Spreader bars, whose length  
exceeds the largest dimension across the unit, MUST be  
used across the top of the unit.  
*.  
A low ambient accessory is available for operation  
down to -20°F.  
LOCATION  
Use the following guidelines to select a suitable location for  
these units:  
1. Unit is designed for outdoor installation only.  
If a unit is to be installed on a roof curb other than a  
YORK roof curb, gasketing must be applied to all  
surfaces that come in contact with the unit under-  
side.  
2. Condenser coils must have an unlimited supply of air.  
Where a choice of location is possible, position the unit  
on either north or east side of building.  
3. Suitable for mounting on roof curb.  
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035-17311-002-A-0803  
TABLE 4: 6 POINT LOAD WEIGHT  
Location (lbs.)*  
Model  
A
B
C
D
E
F
Before lifting, make sure the unit weight is distrib-  
uted equally on the rigging cables so it will lift evenly.  
158  
168  
180  
142  
151  
161  
128  
136  
145  
187  
198  
212  
207  
219  
235  
230  
244  
262  
DM090  
DM120  
DM150  
Units may be moved or lifted with a forklift. Slotted openings  
in the base rails are provided for this purpose.  
*.  
Weights include largest gas heat option.  
LENGTH OF FORKS MUST BE A MINIMUM OF 60  
INCHES.  
TABLE 5: 4 POINT LOAD WEIGHT  
Location (lbs.)*  
Model  
A
B
C
D
DM090  
DM120  
DM150  
230  
245  
262  
197  
209  
224  
287  
305  
327  
336  
357  
382  
All panels must be secured in place when the unit is  
lifted.  
*.  
Weights include largest gas heat option.  
The condenser coils should be protected from rig-  
ging cable damage with plywood or other suitable  
material.  
R
O
N
T
L
E
T
D
C
B
A
E
R
O
N
T
L
E
T
B
C
FIGURE 6 - UNIT 6 POINT LOAD  
A
D
FIGURE 5 - UNIT 4 POINT LOAD  
TABLE 3: UNIT WEIGHTS  
Shipping Weight* (lb.)  
Operating Weight(lb.)  
Model  
DM090  
1056  
1121  
1051  
1116  
FIGURE 7 - UNIT CENTER OF GRAVITY  
CLEARANCES  
DM120  
DM150  
Econ.  
w/ PE  
1200  
85  
1195  
84  
All units require particular clearances for proper operation  
and service. Installer must make provisions for adequate  
ventilation air in accordance with applicable provisions of the  
local building codes. Refer to Table 6 for clearances required  
for combustible construction, servicing, and proper unit oper-  
ation.  
150  
148  
Elec. Heat2  
49  
49  
*.  
Weights include largest gas heat option.  
54kW heater.  
†.  
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035-17311-002-A-0803  
Do not permit overhanging structures or shrubs to  
obstruct condenser air discharge outlet, combustion  
air inlet or vent outlets.  
3
0
-
1
1
/
3
2
5
0
-
3
/
4
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e
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E
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r
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Ø
7
/
8
Ø
2
-
1
/
2
P
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e
r
4
-
1
/
4
E
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-
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o
w
r
O
u
t
l
e
t
D
S
o
r
B
e
a
s
e
r
a
i
l
E
n
t
r
y
8
Ø
7
/
i
m
n
s
i
o
a
n
i
s
R
O
N
T
e
e
D
e
t
l
A
1
7
-
3
/
1
6
3
0
-
3
/
1
6
D
S
o
r
D
e
r
a
i
n
i
m
n
s
i
o
a
n
i
s
6
-
3
/
1
6
2
4
-
3
/
1
6
5
9
e
e
D
e
t
l
B
L
E
T
8
9
2
7
FIGURE 8 - UNIT DIMENSIONS  
TABLE 6: UNIT CLEARANCES  
NOTE: A one-inch clearance must be provided between  
any combustible material and the supply ductwork  
for a distance of 3 feet from the unit.  
Top*  
72”  
36”  
36”  
Right  
12”  
36”  
0”  
Front  
Left  
Rear†  
Bottom‡  
2
-
3
/
8
DETAIL B  
*.  
Units must be installed outdoors. Overhanging struc-  
ture or shrubs should not obstruct condenser air dis-  
charge outlet.  
3
-
3
/
4
†.  
To remove the slide-out drain pan, a rear clearance of  
sixty inches is required. If space is unavailable, the  
drain pan can be removed through the front by separat-  
ing the corner wall.  
‡.  
Units may be installed on combustible floors made from  
wood or class A, B or C roof covering materials.  
3
-
9
/
1
6
DETAIL C  
DETAIL A  
G
a
s
P
i
p
e
I
n
l
e
t
5
-
1
/
4
5
-
3
/
8
B
P
a
a
s
n
e
1
7
-
1
3
/
1
6
V
i
e
w
o
f
W
a
l
l
A
c
r
o
s
s
f
r
o
m
C
o
i
l
Unitary Products Group  
13  
   
035-17311-002-A-0803  
.
32-11/16  
6-13/16  
6-13/16  
Supply  
Air  
6-13/16  
Return  
Air  
24  
27-1/2  
LEFT  
21  
18  
21-3/16  
19-3/16  
17-3/16  
12-15/16  
7-1/8  
FRONT  
14-  
23/32  
Bottom  
Power, Control  
and  
Convenience  
Outlet Wiring  
Entries  
Bottom Gas  
Supply Entry  
Bottom  
Condensate  
Entry  
16-3/8  
18-1/16  
19-5/8  
63-1/2  
FIGURE 9 - BOTTOM DUCT OPENINGS (FROM ABOVE)  
1
8
-
1
/
4
D
o
t
P
l
u
g
s
R
e
t
u
r
n
2
8
-
1
/
4
A
i
r
S
u
p
p
l
y
A
i
r
1
8
-
1
/
4
P
D
a
t
c
h
P
l
a
t
e
o
r
S
l
i
P
d
e
-
O
u
t
1
8
-
1
/
1
6
r
a
i
n
a
n
2
-
3
1
/
3
2
5
-
5
/
3
2
2
8
-
1
/
4
3
1
-
1
1
/
1
6
FIGURE 10 - REAR DUCT DIMENSIONS  
14  
Unitary Products Group  
   
035-17311-002-A-0803  
DUCTWORK  
DUCT COVERS  
Ductwork should be designed and sized according to the  
methods in Manual D of the Air Conditioning Contractors of  
America (ACCA) or as recommended by any other recog-  
nized authority such as ASHRAE or SMACNA.  
Units are shipped with the side duct openings covered and a  
covering over the bottom of the unit. For bottom duct applica-  
tion, no duct cover changes are necessary. For side duct  
application, remove the side duct covers and install over the  
bottom duct openings. The panels removed from the side  
duct connections are designed to be reused by securing each  
panel to its respective downflow opening. But keep in mind  
that the supply panel is installed with the painted surface UP,  
facing the heat exchanger, while the return panel is installed  
with the painted surface DOWN, facing the downflow duct  
opening. The supply panel is secured with the bracket  
(already in place from the factory) and two screws. It’s a snug  
fit for the panel when sliding it between the heat exchanger  
and unit bottom, but there is room. The return panel is  
secured with four screws.  
A closed return duct system should be used. This will not  
preclude use of economizers or outdoor fresh air intake. The  
supply and return air duct connections at the unit should be  
made with flexible joints to minimize noise.  
The supply and return air duct systems should be designed  
for the CFM and static pressure requirements of the job. They  
should NOT be sized to match the dimensions of the duct  
connections on the unit.  
Refer to 9 for bottom air duct openings. Refer to Figure 10 for  
rear air duct openings.  
R
I
G
H
T
8
0
-
5
/
8
I
N
S
U
L
A
T
E
D
D
E
C
K
U
N
D
E
R
C
O
N
D
E
N
S
E
R
S
E
C
T
I
O
N
2
0
S
U
P
P
L
Y
2
0
6
R
E
T
U
R
N
2
T
Y
P
.
3
0
I
N
S
O
U
L
A
T
E
D
D
E
C
K
U
N
D
E
R
5
0
-
1
/
2
C
M
P
R
E
S
S
O
R
S
E
C
T
I
O
N
R
O
N
T
8
o
r
1
4
FIGURE 11 - PREDATOR® ROOF CURB DIMENSIONS  
2
T
Y
P
2
3
4
3
0
-
1
/
2
5
0
-
1
/
2
8
0
-
5
/
8
2
6
R
E
T
U
R
N
S
U
P
P
L
Y
1
0
7
6
-
5
/
8
5
9
-
1
/
4
9
4
R
O
N
T
R
I
G
H
T
6
4
-
1
/
4
FIGURE 12 - SUNLINE™ TO PREDATOR® TRANSITION ROOF CURBS  
Unitary Products Group  
15  
       
035-17311-002-A-0803  
CONDENSATE DRAIN  
The side condensate drain is reversible and maybe re-ori-  
ented to the rear of the cabinet to facilitate condensate pip-  
ing. A condensate drain connection is available through the  
base pan for piping inside the roof curb. Trap the connection  
per Figure 16. The trap and drain lines should be protected  
from freezing.  
When fastening ductwork to side duct flanges on  
unit, insert screws through duct flanges only. DO  
NOT insert screws through casing. Outdoor duct-  
work must be insulated and water-proofed.  
Plumbing must conform to local codes. Use a sealing com-  
pound on male pipe threads. Install condensate drain line  
from the 3/4 inch NPT female connection on the unit to an  
open drain.  
O
P
T
I
O
N
A
L
C
O
I
L
G
U
A
R
D
3
"
M
i
n
i
m
u
m
FIGURE 13 - SIDE PANELS WITH HOLE PLUGS  
Note orientation. Panel is “insulation” side up.  
FIGURE 16 - CONDENSATE DRAIN  
COMPRESSORS  
The compressors are mounted on elastomer insulators. The  
mounting bolts have been fully tightened for shipping.  
Do not loosen the compressor mounting bolts.  
FIGURE 14 - RETURN DOWNFLOW PLENUM WITH  
PANEL  
FILTERS  
Two-inch filters are supplied with each unit. One-inch filters  
may be used with no modification to the filter racks. Filters  
must always be installed ahead of evaporator coil and must  
be kept clean or replaced with same size and type. Dirty fil-  
ters reduce the capacity of the unit and result in frosted coils  
or safety shutdown. All units use four (4) 20”x25”x2” filters.  
The unit should not be operated without filters properly  
installed.  
Make sure that panel latches are properly positioned  
on the unit to maintain an airtight seal.  
FIGURE 15 - DISCHARGE PANEL IN PLACE  
16  
Unitary Products Group  
             
035-17311-002-A-0803  
THERMOSTAT WIRING  
The thermostat should be located on an inside wall approxi-  
mately 56 inches above the floor where it will not be subject  
to drafts, sun exposure or heat from electrical fixtures or  
appliances. Follow the manufacturer's instructions enclosed  
with thermostat for general installation procedure. Seven (7)  
color-coded, insulated wires should be used to connect the  
thermostat to the unit. Refer to Table 7 for control wire sizing  
and maximum length.  
Avoid damage to internal components if drilling  
holes for disconnect mounting.  
NOTE: Since not all local codes allow the mounting of a dis-  
connect on the unit, please confirm compliance with  
local code before mounting a disconnect on the unit.  
TABLE 7: CONTROL WIRE SIZES  
Electrical line must be sized properly to carry the load. USE  
COPPER CONDUCTORS ONLY. Each unit must be wired  
with a separate branch circuit fed directly from the meter  
panel and properly fused.  
Maximum Length*  
Wire Size  
18 AWG  
150 Feet  
*.  
From the unit to the thermostat and back to the unit.  
Refer to Figures 17, 18 and 19 for typical field wiring and to  
the appropriate unit wiring diagram mounted inside control  
doors for control circuit and power wiring information.  
POWER AND CONTROL WIRING  
Field wiring to the unit, fuses, and disconnects must conform  
to provisions of National Electrical Code (NEC), ANSI/NFPA  
No. 70 – Latest Edition (in U.S.A.), current Canadian Electri-  
cal Code C221, and/or local ordinances. The unit must be  
electrically grounded in accordance with NEC and CEC as  
specified above and/or local codes.  
When connecting electrical power and control wiring  
to the unit, water-proof connectors must be used so  
that water or moisture cannot be drawn into the unit  
during normal operation. The above water-proofing  
conditions will also apply when installing a field sup-  
plied disconnect switch.  
Voltage tolerances which must be maintained at the com-  
pressor terminals during starting and running conditions are  
indicated on the unit Rating Plate and Table 1.  
The internal wiring harnesses furnished with this unit are an  
integral part of the design certified unit. Field alteration to  
comply with electrical codes should not be required. If any of  
the wire supplied with the unit must be replaced, replacement  
wire must be of the type shown on the wiring diagram and the  
same minimum gauge as the replaced wire.  
POWER WIRING DETAIL  
Units are factory wired for the voltage shown on the unit  
nameplate. Refer to Electrical Data Tables 8 through 13 size  
power wiring, fuses, and disconnect switch.  
A disconnect must be utilized for these units. Factory  
installed disconnects are available. If installing a disconnect  
Power wiring is brought into the unit through the side of the  
unit or the basepan inside the curb.  
(field supplied or York International supplied accessory),  
refer to Figure 4 for the recommended mounting location.  
Unitary Products Group  
17  
       
035-17311-002-A-0803  
1
T
H
E
R
M
O
S
T
A
T
T
E
R
M
I
N
A
L
S
U
N
I
T
T
E
R
M
I
N
A
L
S
S
T
R
I
P
T
B
1
R
C
R
H
R
Y
1
Y
1
Y
2
Y
2
W
1
W
1
W
2
W
2
G
G
C
C
2
T
4
V
o
s
l
t
o
r
a
n
f
r
m
e
r
X
1
X
2
X
3
O
C
C
X
4
A
A
1
2
T
T
T
O
R
E
M
O
T
E
S
E
N
S
O
R
2
E
T
0
4
7
0
1
3
2
4
I
U
S
E
D
1
E
l
e
c
t
r
o
n
i
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m
m
a
b
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T
h
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m
o
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t
a
t
2
E
T
0
7
7
0
0
1
0
0
2
4
o
(
i
n
c
l
u
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e
s
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b
b
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)
.
T
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A
1
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d
A
2
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-
b
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k
p
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n
.
FIGURE 17 - ELECTRONIC THERMOSTAT FIELD WIRING  
T
-
S
T
A
T
W
1
W
1
W
2
W
2
Y
Y
1
2
Y
Y
1
2
G
G
O
C
C
U
N
I
T
C
O
N
T
R
O
L
C
B
O
A
R
D
R
H
R
C
X
R
S
D
C
FIGURE 18 - FIELD WIRING 24 VOLT THERMOSTAT  
18  
Unitary Products Group  
   
035-17311-002-A-0803  
T
E
R
M
I
N
A
L
B
L
O
C
K
T
B
1
A
C
T
O
R
Y
O
R
I
E
L
D
G
R
O
U
N
D
S
U
P
P
L
I
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D
D
I
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C
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N
N
E
C
T
L
U
G
T
P
H
R
E
S
E
H
O
U
A
P
E
L
P
W
E
R
S
P
Y
FIGURE 19 - FIELD WIRING DISCONNECT  
TABLE 8: ELECTRICAL DATA - DM090 (7-1/2 TON) WITHOUT POWER CONVENIENCE OUTLET  
Min.  
MCA  
Max  
Fuse*  
Size  
Max Fuse*  
Size  
Supply  
Blower  
Pwr  
Exh  
Pwr  
OD Fan  
Motors  
Circuit  
w/Power  
Compressors  
Conv  
Electric Heater Actual Heater  
Ampacity Exhaust  
w/Power  
Exhaust  
Voltage  
Motor FLA Motor Outlet  
Model No.  
KW  
Amps  
1.52  
(Amps)  
1.52  
(Amps)  
1.52 1.52  
(Amps)  
RLA  
ea.  
LRA  
ea.  
FLA  
ea.  
1.5 2  
FLA  
FLA  
HP  
HP  
HP HP HP HP HP HP HP  
HP  
30  
30  
30  
40  
50  
None  
--  
--  
20.7 21.7 22.9 23.9 25 25  
20.7 21.7 22.9 23.9 25 25  
25.3 26.6 28.1 29.3 30 30  
32.4 33.6 35.1 36.4 35 35  
44.3 45.6 47.1 48.3 45 50  
25  
25  
30  
40  
50  
2TP04520950  
2TP04521850  
2TP04522450  
2TP04523650  
5.6  
11.3  
15  
8.5  
380  
*
7.1  
54.0  
0.8  
3.1  
4.1  
2.2  
0.0  
17.2  
22.8  
32.4  
21.3  
Maximum HACR breaker of the same AMP size is applicable.  
TABLE 9: ELECTRICAL DATA - DM090 (7-1/2 TON) WITH POWER CONVENIENCE OUTLET  
Min.  
MCA  
Max  
Fuse*  
Size  
Max Fuse*  
Size  
Supply  
Blower  
Pwr  
Exh  
Pwr  
OD Fan  
Motors  
Circuit  
w/Power  
Compressors  
Conv  
Electric Heater Actual Heater  
Ampacity Exhaust  
w/Power  
Exhaust  
Voltage  
Motor FLA Motor Outlet  
Model No.  
KW  
Amps  
1.52  
(Amps)  
1.52  
(Amps)  
1.52 1.52  
(Amps)  
RLA  
ea.  
LRA  
ea.  
FLA  
ea.  
1.5 2  
FLA  
FLA  
HP  
HP  
HP HP HP HP HP HP HP  
HP  
35  
35  
40  
45  
60  
None  
--  
--  
27  
27  
28 29.2 30.2 30 35  
28 29.2 30.2 30 35  
35  
35  
40  
45  
60  
2TP04520950  
2TP04521850  
2TP04522450  
2TP04523650  
5.6  
11.3  
15  
8.5  
380  
*
7.1  
54.0  
0.8  
3.1  
4.1  
2.2  
6.3  
17.2  
22.8  
32.4  
33.2 34.5 36 37.2 35 35  
40.2 41.5 43 44.2 45 45  
52.2 53.5 55 56.2 60 60  
21.3  
Maximum HACR breaker of the same AMP size is applicable.  
Unitary Products Group  
19  
     
035-17311-002-A-0803  
TABLE 10: ELECTRICAL DATA - DM120 (10 TON) WITHOUT POWER CONVENIENCE OUTLET  
MCA  
Max  
Fuse*  
Size  
Max Fuse*  
Size  
Supply  
Blower Motor Exh  
FLA  
Pwr  
Pwr  
Min. Circuit  
Ampacity  
(Amps)  
OD Fan  
Motors  
w/Power  
Exhaust  
(Amps)  
Compressors  
Conv  
Electric Heater Actual Heater  
w/Power  
Exhaust  
Voltage  
Motor Outlet  
Model No.  
KW  
Amps  
(Amps)  
3
RLA  
ea.  
LRA  
ea.  
FLA  
ea.  
2
3
2
3
2
3
2
2
3
FLA  
FLA  
HP  
HP  
HP HP HP HP HP HP HP  
HP  
45  
45  
45  
50  
80  
None  
--  
--  
33.2 34.4 35.4 36.6 40 45  
33.2 34.4 35.4 36.6 40 45  
33.6 35.1 36.4 37.9 40 45  
45.6 47.1 48.3 49.8 50 50  
69.3 70.8 72.1 73.6 70 80  
45  
45  
45  
50  
80  
2TP04521850  
2TP04522450  
2TP04523650  
2TP04525450  
11.3  
15  
17.2  
22.8  
32.4  
51.4  
380  
*
11.5  
75.0  
1.6  
4.1  
5.3  
2.2  
0.0  
21.3  
33.8  
Maximum HACR breaker of the same AMP size is applicable.  
TABLE 11: ELECTRICAL DATA - DM120 (10 TON) WITH POWER CONVENIENCE OUTLET  
MCA  
Max  
Fuse*  
Size  
Max Fuse*  
Size  
Supply  
Blower Motor Exh  
FLA  
Pwr  
Pwr  
Min. Circuit  
Ampacity  
(Amps)  
OD Fan  
Motors  
w/Power  
Exhaust  
(Amps)  
Compressors  
Conv  
Electric Heater Actual Heater  
w/Power  
Exhaust  
Voltage  
Motor Outlet  
Model No.  
KW  
Amps  
(Amps)  
2
RLA  
ea.  
LRA  
ea.  
FLA  
ea.  
2
3
2
3
2
3
3
2
3
FLA  
FLA  
HP  
HP  
HP HP HP HP HP HP HP  
HP  
50  
50  
50  
60  
90  
None  
--  
--  
39.5 40.7 41.7 42.9 50 50  
39.5 40.7 41.7 42.9 50 50  
41.5 43 44.2 45.7 50 50  
53.5 55 56.2 57.7 60 60  
77.2 78.7 79.9 81.4 80 80  
50  
50  
50  
60  
80  
2TP04521850  
2TP04522450  
2TP04523650  
2TP04525450  
11.3  
15  
17.2  
22.8  
32.4  
51.4  
380  
*
11.5  
75.0  
1.6  
4.1  
5.3  
2.2  
6.3  
21.3  
33.8  
Maximum HACR breaker of the same AMP size is applicable.  
TABLE 12: ELECTRICAL DATA - DM150 (12-1/2 TON) WITHOUT POWER CONVENIENCE OUTLET  
Min.  
MCA  
Max  
Fuse*  
Size  
Max Fuse*  
Size  
Supply  
Blower  
Pwr  
Exh  
Pwr  
OD Fan  
Motors  
Circuit  
w/Power  
Compressors  
Conv  
Electric Heater Actual Heater  
Ampacity Exhaust  
(Amps) (Amps)  
w/Power  
Exhaust  
Voltage  
Motor FLA Motor Outlet  
Model No.  
KW  
Amps  
(Amps)  
R3LA 5LRA  
FLA  
ea.  
3
5
3
5
FLA  
FLA  
ea.  
ea.  
HP  
HP  
HP HP HP HP HP HP HP  
HP  
40  
40  
45  
60  
80  
None  
--  
--  
30.1 32.9 32.3 35.1 35 40  
30.1 32.9 32.3 35.1 35 40  
35.1 38.6 37.9 41.4 40 40  
47.1 50.6 49.8 53.3 50 60  
70.8 74.3 73.6 77.1 80 80  
40  
40  
40  
50  
80  
2TP04521850  
2TP04522450  
2TP04523650  
2TP04525450  
11.3  
15  
17.2  
22.8  
32.4  
51.4  
380  
*
9.6  
79.0  
1.6  
5.3  
8.1  
2.2  
0.0  
21.3  
33.8  
Maximum HACR breaker of the same AMP size is applicable.  
TABLE 13: ELECTRICAL DATA - DM150 (12-1/2 TON) WITH POWER CONVENIENCE OUTLET  
MCA  
Max  
Max Fuse*  
Size  
Supply  
Blower Motor Exh  
FLA  
Pwr  
Pwr  
Min. Circuit  
Ampacity  
(Amps)  
OD Fan  
Motors  
w/Power  
Exhaust  
(Amps)  
Fuse*  
Size  
Compressors  
Conv  
Electric Heater Actual Heater  
w/Power  
Exhaust  
Voltage  
Motor Outlet  
Model No.  
KW  
Amps  
(Amps)  
R3LA 5LRA  
FLA  
ea.  
3
5
3
5
FLA  
FLA  
ea.  
ea.  
HP  
HP  
HP HP HP HP HP HP HP  
HP  
50  
50  
50  
70  
90  
None  
--  
--  
36.4 39.2 38.6 41.4 45 45  
36.4 39.5 38.7 42.2 45 45  
43 46.5 45.7 49.2 45 50  
55 58.5 57.7 61.2 60 60  
78.7 82.2 81.4 84.9 80 90  
45  
45  
50  
60  
90  
2TP04521850  
2TP04522450  
2TP04523650  
2TP04525450  
11.3  
15  
17.2  
22.8  
32.4  
51.4  
380  
*
9.6  
79.0  
1.6  
5.3  
8.1  
2.2  
6.3  
21.3  
33.8  
Maximum HACR breaker of the same AMP size is applicable.  
20  
Unitary Products Group  
       
035-17311-002-A-0803  
TABLE 14: PHYSICAL DATA  
Models  
120  
Component  
090  
150  
Blower, Centrifugal (Dia. X Wd. in.)  
15 x 15  
15 x 15  
15 x 15  
Evaporator  
Blower  
Motor, Standard (HP)  
Motor, Optional (HP)  
Rows  
1-1/2  
2
2
3
3
5
2
2
3
Fins per Inch  
15  
32  
15  
40  
15  
40  
Evaporator  
DM  
Height (in.)  
Coil  
2
10.6  
13.2  
13.2  
Face Area (ft. each)  
Propeller Dia. (in., each)  
Motor (HP, each)  
CFM, Nominal (each)  
Rows (each)  
24  
1/3  
3400  
1
24  
3/4  
4400  
1
24  
3/4  
4400  
2
Condenser  
Fan  
(2 per Unit)  
DM  
DM  
Condenser  
Coil  
(2 per unit)  
Fins per Inch  
20  
20  
20  
Height (in. each)  
28  
44  
44  
2
9.2  
4/12  
4/6  
14.5  
6/12  
6/12  
14.5  
10/12  
9/8  
Face Area (ft. each)  
System 1 (lb./oz.)  
System 2 (lb./oz.)  
Refrigerant  
Charge  
DM  
DM  
Quantity  
Type  
2
Recip  
25x20x2  
4
2
Recip  
25x20x2  
4
2
Recip  
25x20x2  
4
Compressors  
Air Filters  
Size (Wd. x Ht. x Thickness in.)  
Number Per Unit  
OPTIONS/ACCESSORIES  
TABLE 15: MINIMUM SUPPLY AIR CFM  
ELECTRIC HEAT ACCESSORIES  
Heater  
Unit Model Size, Nominal Tons  
7.5 10  
Minimum Supply Air CFM  
Electric heaters are available as field installed accessories.  
Refer to electric heat instructions for installation. These heat-  
ers mount in the heat compartment with the heating elements  
extending into the supply air chamber. All electric heaters are  
fused and intended for use with single point power supply.  
12.5  
kW  
Voltage  
9
2250  
N/A  
N/A  
18  
24  
36  
54  
2250  
2250  
2250  
N/A  
3000  
3000  
3000  
3000  
3750  
3750  
3750  
3750  
ELECTRIC HEAT OPTION  
380  
The factory-installed heaters are wired for single point power  
supply. Power supply need only be brought into the single  
point terminal block.  
These CSA approved heaters are located within the central  
compartment of the unit with the heater elements extending  
into the supply air chamber.  
MOTORIZED OUTDOOR DAMPER  
The Motorized Outdoor Damper can be a factory installed  
option or a field installed accessory. If factory installed, refer  
to the instructions included with the outdoor air hood to com-  
plete the assembly. Field installed Motorized Outdoor  
Damper accessories include complete instructions for instal-  
lation.  
Fuses are supplied, where required, by the factory. Some kW  
sizes require fuses and other do not. Refer to Table 15 for  
minimum CFM limitations and to Tables 8 through 13 for elec-  
trical data.  
Unitary Products Group  
21  
           
035-17311-002-A-0803  
ECONOMIZER  
ON position and then OFF or energize and de-energize  
terminals “R” to “G”.  
The Economizer can be a factory installed option or a field  
installed accessory. If factory installed, refer to the instruc-  
tions included with the outdoor air hood to complete the  
assembly. Field installed Economizer accessories include  
complete instructions for installation.  
With the thermostat set to the indoor fan ON position or  
terminals “R” to “G” energized, turn the Minimum Posi-  
tion Adjusting screw (located on the damper control  
module) counterclockwise until the desired minimum  
damper position has been attained.  
There are two Economizer options:  
ENTHALPY SET POINT ADJUSTMENT  
1. Down Flow application with barometric relief hood  
standard.  
The enthalpy set point may now be set by selecting the  
desired set point shown in the Enthalpy Set Point Adjustment  
Figure 20. Adjust as follows:  
2. Horizontal Flow application that requires the purchase of  
a barometric relief hood.  
POWER EXHAUST  
For a single enthalpy operation carefully turn the set  
point adjusting screw (found on the damper control mod-  
ule) to the "A", "B", "C" or "D" setting corresponding to  
the lettered curve of the Enthalpy Set Point Adjustment  
The Power Exhaust can be a factory installed option or a field  
installed accessory. If factory installed, refer to the instruc-  
tions included with the outdoor air hood to complete the  
assembly. Field installed Power Exhaust accessories include  
complete instructions for installation.  
For a dual enthalpy operation, carefully turn the set point  
adjusting screw fully clockwise past the "D" setting.  
The Power Exhaust factory installed option is for Down Flow  
application only.  
POWER EXHAUST DAMPER SET POINT (WITH OR WITH-  
OUT POWER EXHAUST)  
There are two field installed Power Exhaust accessories:  
1. Down Flow application.  
With no power exhaust option, adjust the Exhaust Air  
Adjustment Screw fully clockwise. This will allow 2nd  
stage cooling to operate.  
2. Horizontal Flow application that requires the purchase of  
a barometric relief hood.  
With power exhaust option, each building pressurization  
requirement will be different. The point at which the  
power exhaust comes on is determined by the econo-  
mizer damper position (Percent Open). The Exhaust Air  
Adjustment Screw should be set at the Percent Open of  
the economizer damper at which the power exhaust is  
needed. It can be set from 0 to 100% damper open.  
RAIN HOOD  
All of the hood components, including the filters, the gasket-  
ing and the hardware for assembling, are packaged and  
located between the condenser coil section and the main unit  
cabinet, if the unit has factory installed options. If field  
installed accessories are being installed all parts necessary  
for the installation comes in the accessory.  
INDOOR AIR QUALITY AQ  
ECONOMIZER AND POWER EXHAUST SET POINT  
ADJUSTMENTS AND INFORMATION  
Indoor Air Quality (indoor sensor input): Terminal AQ accepts  
a +2 to +10 Vdc signal with respect to the (AQ1) terminal.  
When the signal is below it's set point, the actuator is allowed  
to modulate normally in accordance with the enthalpy and  
mixed air sensor inputs. When the AQ signal exceeds it's set  
point setting and there is no call for free cooling, the actuator  
is proportionately modulated from the 2 to 10 Vdc signal, with  
2 Vdc corresponding to full closed and 10 Vdc corresponding  
to full open. When there is no call for free cooling, the damper  
position is limited by the IAQ Max damper position setting.  
When the signal exceeds it's set point (Demand Control Ven-  
tilation Set Point) setting and there is a call for free cooling,  
the actuator modulates from the minimum position to the full  
open position based on the highest call from either the mixed  
air sensor input or the AQ voltage input.  
Remove the top rear access panel from the unit. Locate the  
economizer control module, where the following adjustments  
will be made.  
Extreme care must be exercised in turning all set  
point, maximum and minimum damper positioning  
adjustment screws to prevent twisting them off.  
MINIMUM POSITION ADJUSTMENT  
Optional CO Space Sensor Kit Part # 2AQ04700324  
2
Check that the damper blades move smoothly without  
binding; carefully turn the Minimum Position Adjust  
screw (found on the damper control module) fully clock-  
wise and then set the thermostat indoor fan switch to the  
Optional CO Sensor Kit Part # 2AQ04700424  
2
Replace the top rear access panel on the unit.  
22  
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035-17311-002-A-0803  
CONTROL POINT  
APPROX. 0F (0C)  
AT 50% RH  
CONTROL  
CURVE  
85 90 95 100 105 110  
(29) (32) (35) (38) (41) (43)  
A
B
C
D
73 (23)  
70 (21)  
67 (19)  
63 (17)  
80  
(27)  
75  
(24)  
70  
(21)  
65  
(18)  
0  
(16)  
55  
(13)  
A
B
50  
(10)  
C
45  
(7)  
D
40  
(4)  
35  
(2)  
A
B
C
D
40 45  
(4) (7)  
65 70 75 80  
(24) (27)  
95  
105 110  
(41) (43)  
35  
(2)  
50 55 60  
(10) (13) (16)  
85 90  
(29) (32)  
100  
(38)  
(21)  
(18)  
(35)  
APPROXIMATE DRY BULB TEMPERATURE - 0F (0C)  
FIGURE 20 - ENTHALPY SET POINT CHART  
Exhaust Air  
Adjustment  
Screw  
EXH  
Set  
N
P
T
N1  
TR  
TR1  
Exhaust Air LED  
Damper Min.  
Position  
Screw  
24  
Vac  
HOT  
24  
Vac  
COM  
EXH  
P1  
T1  
Min  
Pos  
Indoor Air Quality  
Max. Adjustment  
Screw  
+
IAQ  
Max  
1
2
Indoor Air Quality  
LED  
IAQ  
AQ1  
SO+  
AQ  
SO  
5
4
Indoor Air Quality  
Min. Adjustment  
Screw  
IAQ  
Min  
3
Free  
Cool  
Free Cooling LED  
SR  
B
SR+  
EF  
EF1  
C
D
A
Economizer Enthalpy  
Set Point Adjustment  
Screw  
FIGURE 21 - HONEYWELL ECONOMIZER CONTROL W7212  
Unitary Products Group  
23  
   
035-17311-002-A-0803  
PHASING  
A
®
Predator units are properly phased at the factory. Check for  
proper compressor rotation. If the blower or compressors  
rotate in the wrong direction at start-up, the electrical connec-  
tion to the unit is misphased. Change the phasing of the Field  
Line Connection at the factory or field supplied discon-  
nect to obtain proper rotation. (Scroll compressors operate in  
only one direction. If the scroll is drawing low amperage, has  
similar suction and discharge pressures, or producing a high  
noise level, the scroll is misphased.)  
A
C*  
* NEVER LOOSEN  
A
B
SPAN LENGTH  
DEFL. FORCE  
Scroll compressors require proper rotation to oper-  
ate correctly. Units are properly phased at the fac-  
tory. Do not change the internal wiring to make the  
blower condenser fans, or compressor rotate cor-  
rectly.  
BLOWER ROTATION  
Check for proper supply air blower rotation. If the blower is  
rotating backwards, the line voltage at the unit point of power  
connection is misphased (See ‘PHASING’).  
FIGURE 22 - BELT ADJUSTMENT  
TABLE 16: SUPPLY AIR LIMITATIONS  
Unit Size  
Minimum  
Maximum  
090  
120  
150  
2250  
3000  
3750  
3750  
5000  
6250  
Procedure for adjusting belt tension:  
1. Loosen six nuts (top and bottom) A.  
2. Adjust by turning (B).  
3. Never loosen nuts (C).  
BELT TENSION  
4. Use belt tension checker to apply a perpendicular  
force to one belt at the midpoint of the span as  
shown. Deflection distance of 4mm (5/32”) is  
obtained.  
The tension on the belt should be adjusted as shown in  
Figure 22.  
To determine the deflection distance from normal  
position, use a straight edge from sheave to sheave  
as reference line. The recommended deflection  
force is as follows:  
Tension new belts at the max. deflection force rec-  
ommended for the belt section. Check the belt ten-  
sion at least two times during the first 24 hours of  
operation. Any retensioning should fall between the  
min. and max. deflection force values.  
5. After adjusting retighten nuts (A).  
24  
Unitary Products Group  
         
035-17311-002-A-0803  
* †  
TABLE 17: 7-1/2 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
0.2  
0.4  
0.6  
0.8  
1.0  
-
-
-
3715 1573 1.69  
3510 1490 1.60  
3146 1351 1.45  
3634 1434 1.54  
3320 1313 1.41  
3431 1265 1.36  
3079 1145 1.23  
2621 1005 1.08  
3218 901 0.97  
2832 810 0.87  
2307 706 0.76  
3024 976 1.05  
2586 860 0.92  
3650 1657 1.78  
3334 1522 1.63  
2903 1352 1.45  
2910 1169  
1.25  
-
-
-
-
-
-
-
-
-
2622 1167  
1.25  
-
2404 1013 1.09  
2054  
-
858  
-
0.92  
-
-
-
-
-
-
-
2356 1159  
1.24  
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
* †  
TABLE 18: 7-1/2 TON OPTIONAL MOTOR DOWN SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
0.2  
0.4  
0.6  
0.8  
1.0  
1.2  
1.4  
1.6  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3992 1904 2.04 3798 1679 1.80  
3930 2017 2.16 3734 1786 1.92 3486 1552 1.66  
3947 2176 2.33 3670 1895 2.03 3394 1641 1.76 3084 1401 1.50  
4138 2384 2.56 3623 2009 2.15 3323 1742 1.87 2971 1477 1.58 2591 1236 1.33  
4126 2430 2.61 3643 2145 2.30 3224 1820 1.95 2889 1569 1.68 2466 1306 1.40  
-
-
-
-
-
-
-
-
-
-
-
-
3613 2238 2.40 3143 1921 2.06 2748 1621 1.74 2369 1385 1.49  
-
-
-
-
-
-
-
-
-
3099 2039 2.19 2636 1714 1.84 2195 1424 1.53  
2586 1833 1.97  
-
-
-
-
-
-
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
Unitary Products Group  
25  
       
035-17311-002-A-0803  
* †  
TABLE 19: 10 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
0.2  
0.4  
0.6  
0.8  
1.0  
-
-
-
-
-
-
-
-
-
3896 1639 1.76 3688 1453 1.56 3447 1268 1.36  
4040 2076 2.23  
3890 2006 2.15  
3620 1882 2.02  
3227 1708 1.83  
4005 1934 2.07 3790 1698 1.82 3569 1508 1.62 3333 1330 1.43 3057 1147 1.23  
3697 1790 1.92 3427 1550 1.66 3152 1356 1.45  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3324 1629 1.75 2972 1380 1.48  
-
-
-
-
-
-
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
* †  
TABLE 20: 10 TON OPTIONAL MOTOR DOWN SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
4965 3485 3.74  
4876 3416 3.66  
4713 3291 3.53  
4476 3116 3.34  
4165 2898 3.11  
3779 2646 2.84  
3319 2372 2.54  
4875 3150 3.38 4613 2739 2.94 4322 2374 2.55 4156 2106 2.26 3907 1860 1.99  
4651 2997 3.21 4359 2582 2.77 4038 2220 2.38 3860 1966 2.11 3590 1724 1.85  
4387 2823 3.03 4077 2417 2.59 3719 2059 2.21 3541 1827 1.96 3242 1584 1.70  
0.4  
0.6  
0.8  
1.0  
1.2  
1.4  
1.6  
4084 2632 2.82 3768 2245 2.41 3365 1892 2.03 3197 1691 1.81  
-
-
-
-
-
-
-
-
-
-
-
-
3741 2427 2.60 3432 2070 2.22  
3359 2212 2.37 3069 1895 2.03  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
26  
Unitary Products Group  
       
035-17311-002-A-0803  
* †  
TABLE 21: 12-1/2 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
0.4  
0.6  
0.8  
1.0  
1.2  
1.4  
5078 3630 3.89 4809 3103 3.33 4594 3053 3.27 4360 2478 2.66 4090 2093 2.24 3812 1798 1.93  
4865 3456 3.71 4584 2961 3.17 4349 2912 3.12 4106 2318 2.49 3814 1964 2.11  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
4642 3284 3.52 4356 2828 3.03 4089 2776 2.98 3840 2137 2.29  
-
-
-
-
-
-
-
-
-
-
-
-
4408 3114 3.34 4124 2705 2.90 3815 2647 2.84  
-
-
-
-
-
-
-
-
-
4164 2947 3.16 3889 2592 2.78  
3910 2787 2.99  
-
-
-
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
* †  
TABLE 22: 12-1/2 TON OPTIONAL MOTOR DOWN SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
5994 5400 5.79 5565 4369 4.69 5488 4169 4.47 5264 3599 3.86 4990 3085 3.31 4738 2812 3.02  
5824 5216 5.59 5368 4186 4.49 5289 3991 4.28 5049 3437 3.69 4763 2937 3.15 4491 2655 2.85  
5641 5022 5.39 5170 4012 4.30 5076 3807 4.08 4822 3272 3.51 4528 2790 2.99 4235 2497 2.68  
5444 4819 5.17 4971 3846 4.12 4847 3618 3.88 4584 3103 3.33 4286 2644 2.83 3969 2340 2.51  
0.4  
0.6  
0.8  
1.0  
1.2  
1.4  
1.6  
1.8  
2.0  
2.2  
5233 4609 4.94 4771 3687 3.95 4604 3426 3.67 4335 2933 3.15 4035 2499 2.68  
5009 4394 4.71 4571 3537 3.79 4346 3233 3.47 4074 2762 2.96 3777 2356 2.53  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
4771 4174 4.48 4370 3395 3.64 4074 3040 3.26 3802 2590 2.78  
-
-
-
-
-
-
-
-
-
-
-
-
4520 3951 4.24 4169 3262 3.50 3786 2850 3.06  
-
-
-
-
-
-
-
-
-
4255 3728 4.00 3966 3137 3.36  
3976 3505 3.76 3763 3020 3.24  
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
Unitary Products Group  
27  
       
035-17311-002-A-0803  
* †  
TABLE 23: 7-1/2 TON STANDARD MOTOR SIDE SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
0.4  
0.6  
0.8  
1.0  
1.2  
-
-
-
-
-
-
-
-
-
3736 1476 1.58 3487 1284 1.38  
3389 1339 1.44 3094 1151 1.23  
3231 1109 1.19 3001 970  
1.04  
3572 1514 1.62  
2764  
972  
1.04 2446 824  
0.88  
3422 1558 1.67 3179 1364 1.46  
2891 1347 1.44 2372 1088 1.17  
2889 1164 1.25 2554  
985  
1.06  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2050  
-
922  
-
0.99  
-
-
-
-
-
-
-
2017 1051 1.13  
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
* †  
TABLE 24: 7-1/2 TON OPTIONAL MOTOR SIDE SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3910 1726 1.85  
3597 1430 1.53  
3172 1430 1.53  
2248 1143 1.23  
0.4  
0.6  
0.8  
1.0  
1.2  
1.4  
1.6  
1.8  
3857 1842 1.98  
3503 1689 1.81  
3032 1497 1.61  
2160 1217 1.31  
3804 1957 2.10  
3774 2088 2.24 3406 1778 1.91  
3327 1866 2.00 2926 1578 1.69  
2537 1544 1.66 2043 1296 1.39  
-
-
-
-
-
-
-
-
-
-
-
-
3270 1971 2.11  
-
-
-
-
-
-
-
-
-
3196 2077 2.23 2460 1651 1.77  
2426 1768 1.90  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
28  
Unitary Products Group  
   
035-17311-002-A-0803  
* †  
TABLE 25: 10 TON STANDARD MOTOR DOWN SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
0.2  
0.4  
0.6  
0.8  
1.0  
-
-
-
-
-
-
-
-
-
3896 1639 1.76 3688 1453 1.56 3447 1268 1.36  
4040 2076 2.23 4005 1934 2.07 3790 1698 1.82 3569 1508 1.62 3333 1330 1.43 3057 1147 1.23  
3890 2006 2.15 3697 1790 1.92 3427 1550 1.66 3152 1356 1.45  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3620 1882 2.02 3324 1629 1.75 2972 1380 1.48  
3227 1708 1.83  
-
-
-
-
-
-
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
* †  
TABLE 26: 10 TON OPTIONAL MOTOR DOWN SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
0.4  
0.6  
0.8  
1.0  
1.2  
1.4  
1.6  
4965 3485 3.74 4875 3150 3.38 4613 2739 2.94 4322 2374 2.55 4156 2106 2.26 3907 1860 1.99  
4876 3416 3.66 4651 2997 3.21 4359 2582 2.77 4038 2220 2.38 3860 1966 2.11 3590 1724 1.85  
4713 3291 3.53 4387 2823 3.03 4077 2417 2.59 3719 2059 2.21 3541 1827 1.96 3242 1584 1.70  
4476 3116 3.34 4084 2632 2.82 3768 2245 2.41 3365 1892 2.03 3197 1691 1.81  
-
-
-
-
-
-
-
-
-
-
-
-
4165 2898 3.11  
3779 2646 2.84 3359 2212 2.37 3069 1895 2.03  
3319 2372 2.54  
3741 2427 2.60 3432 2070 2.22  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
Unitary Products Group  
29  
   
035-17311-002-A-0803  
* †  
TABLE 27: 12-1/2 TON STANDARD MOTOR SIDE SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP CFM  
BHP  
5201 3162 3.39 4966 2796 3.00 4681 2405 2.58 4355 2054 2.20  
0.4  
0.6  
0.8  
1.0  
1.2  
1.4  
-
-
-
-
-
-
-
-
-
-
-
-
5220 3395 3.64 4942 2980 3.20 4657 2608 2.80 4358 2230 2.39 4007 1890 2.03  
4944 3194 3.43 4661 2806 3.01 4378 2572 2.76 4016 2057 2.21  
-
-
-
-
-
-
-
-
-
-
-
-
5003 3490 3.74 4647 2988 3.20 4380 2636 2.83 4030 2257 2.42  
-
-
-
-
-
-
-
-
-
4724 3290 3.53 4363 2875 3.08 4012 2505 2.69  
4428 3040 3.26  
-
-
-
-
-
-
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
* †  
TABLE 28: 12-1/2 TON OPTIONAL MOTOR SIDE SHOT BLOWER PERFORMANCE  
TURNS OPEN**  
ESP‡  
0
1
2
3
4
5
W††  
CFM  
BHP CFM  
BHP CFM  
BHP  
CFM  
BHP CFM  
BHP CFM  
BHP  
0.4  
0.6  
0.8  
1.0  
1.2  
1.4  
1.6  
1.8  
2.0  
2.2  
2.4  
2.6  
-
-
-
-
-
-
-
-
-
6447 5315 5.70 6207 4760 5.1046 5966 4205 4.51 5717 3716 3.98 5470 3307 3.55  
6110 4917 5.27 5965 4464  
5772 4519 4.85 5741 4274  
4.79  
4.58  
4.34  
4.13  
3.94  
3.71  
3.47  
3.07  
-
5740 4023 4.31 5430 3501 3.75 5126 3054 3.28  
5503 3821 4.10 5162 3294 3.53 4849 2870 3.08  
5244 3611 3.87 4882 3101 3.33 4530 2667 2.86  
4941 3387 3.63 4589 2906 3.12 4225 2502 2.68  
4651 3178 3.41 4284 2716 2.91 3858 2280 2.45  
4365 2983 3.20 3951 2516 2.70 3491 2058 2.21  
6235 5521 5.92 5628 4407 4.73 5474 4048  
5881 5137 5.51 5384 4205 4.51 5248 3854  
5695 4950 5.31 5123 3996 4.29 5014 3670  
5471 4728 5.07 4919 3828 4.11 4732 3460  
5242 4514 4.84 4656 3611 3.87 4438 3240  
4954 4231 4.54 4339 3380 3.62 3905 2861  
3998 2740 2.94 3618 2316 2.48  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
3631 2497 2.68  
-
-
-
-
-
-
-
-
-
-
-
-
4585 3934 4.22 4022 3149 3.38  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
4217 3637 3.90  
3848 3340 3.58  
-
-
-
-
-
-
-
-
*.  
Blower performance for gas heat includes maximum number of heat tubes available for each tonnage.  
Blower performance includes two-inch throwaway filters.  
†.  
‡.  
ESP (External Static Pressure) given is that available for the supply and return air duct system. All internal resistances have been  
deducted from the total static pressure of the blower.  
**.  
“Turns Open” refers to the setting of the variable pitch motor sheave, where “0 Turns Open” is fully closed.  
W = Watts  
††.  
NOTES FOR TABLE 17 THROUGH TABLE 28:  
Blower performance includes dry coil and two-inch  
filters.  
Blower performance for gas heat includes the maximum  
number of heat tubes available for each tonnage.  
ESP (External Static Pressure) given is that available for  
the supply and return air duct system. All internal resis-  
tances have been deducted from the total static pressure  
of the blower.  
30  
Unitary Products Group  
       
035-17311-002-A-0803  
TABLE 29: INDOOR BLOWER SPECIFICATIONS  
MOTOR  
RPM Eff.  
1-1/2 1725 80% 1.15  
MOTOR SHEAVE  
BLOWER SHEAVE  
MODEL  
DM090  
DM120  
DM150  
BELT  
HP  
SF  
Frame Datum Dia. (in.) Bore (in.) Model Datum Dia. (in.) Bore (in.) Model  
56  
56  
3.4 - 4.4  
3.4 - 4.4  
3.4 - 4.4  
3.4 - 4.4  
3.4 - 4.4  
4.3 - 5.3  
7/8  
7/8  
1VM50  
1VM50  
1VM50  
1VM50  
1VM50  
1VP56  
9.0  
7.5  
8.5  
7.0  
7.0  
6.7  
1
1
1
1
1
1
AK94  
AK79  
AK89  
AK74  
AK74  
BK77  
A57  
A55  
A56  
A54  
A54  
BX55  
2
2
3
3
5
1725 80% 1.15  
1725 80% 1.15  
1725 80% 1.15  
1725 80% 1.15  
1725 87% 1.15  
56  
7/8  
56  
7/8  
56  
7/8  
184T  
1 1/8  
AIR BALANCE  
Start the supply air blower motor. Adjust the resistances in both the supply and the return air duct systems to balance the air  
distribution throughout the conditioned space. The job specifications may require that this balancing be done by someone other  
than the equipment installer.  
CHECKING AIR QUANTITY  
METHOD ONE  
METHOD TWO  
1. Remove the dot plugs from the duct panel (for location of  
the dot plugs see Figure 10).  
1. Drill two 5/16 inch holes, one in the return air duct as  
close to the inlet of the unit as possible, and another in  
the supply air duct as close to the outlet of the unit as  
possible.  
2. Insert eight-inches of 1/4 inch metal tubing into the air-  
flow on both sides of the indoor coil.  
2. Using the whole drilled in step 1, insert eight inches of  
1/4 inch metal tubing into the airflow of the return and  
supply air ducts of the unit.  
NOTE: The tubes must be inserted and held in a position  
perpendicular to the air flow so that velocity pres-  
sure will not affect the static pressure readings.  
NOTE: The tubes must be inserted and held in position per-  
pendicular to the airflow so that velocity pressure  
will not affect the static pressure readings.  
3. Use an Inclined Manometer or Magnehelic to determine  
the pressure drop across a dry evaporator coil. Since the  
moisture on an evaporator coil can vary greatly, measur-  
ing the pressure drop across a wet coil under field condi-  
tions could be inaccurate. To assure a dry coil, the  
compressors should be de-activated while the test is  
being run.  
3. Use an Inclined Manometer or Magnehelic to determine  
the pressure drop across the unit. This is the External  
Static Pressure (ESP). In order to obtain an accurate  
measurement, be certain that the air filters are clean.  
4. Determine the number of turns the variable motor  
sheave is open.  
NOTE: De-energize the compressors before taking any test  
measurements to assure a dry evaporator coil.  
5. Select the correct blower performance table for the unit  
from Tables 17 - 28. Tables are presented for horizontal  
and downflow configuration.  
4. The CFM through the unit can be determined from the  
pressure drop indicated by the manometer by referring to  
Figure 23. In order to obtain an accurate measurement,  
be certain that the air filters are clean.  
6. Determine the unit Measured CFM from the Blower Per-  
formance Table, External Static Pressure and the num-  
ber of turns the variable motor sheave is open.  
5. To adjust Measured CFM to Required CFM, see ’SUP-  
7. To adjust Measured CFM to Required CFM, see ’SUP-  
6. After readings have been obtained, remove the tubes  
and replace the dot plugs.  
8. After reading has been obtained, remove the tubes and  
seal holes.  
NOTE: With the addition of field installed accessories  
repeat this procedure.  
Failure to properly adjust the total system air quan-  
tity can result in extensive blower damage.  
Failure to properly adjust the total system air quan-  
tity can result in extensive blower damage.  
Unitary Products Group  
31  
         
035-17311-002-A-0803  
FIGURE 23 - DRY COIL DELTA P  
SUPPLY AIR DRIVE ADJUSTMENT  
EXAMPLE  
A 12.5 ton unit was selected to deliver 4,000 CFM with a 3  
HP motor, but the unit is delivering 3,800 CFM. The variable  
pitch motor sheave is set at 2 turns open.  
Before making any blower speed changes review  
the installation for any installation errors, leaks or  
undesirable systems effects that can result in loss of  
airflow.  
Use the equation to determine the required DD for the new  
motor sheave,  
4,000 CFM  
3,800 CFM  
• 4.0 in. = 4.21 in.  
(
)
Even small changes in blower speed can result in  
substantial changes in static pressure and BHP.  
BHP and AMP draw of the blower motor will  
increase by the cube of the blower speed. Static  
pressure will increase by the square of the blower  
speed. Only qualified personnel should make blower  
speed changes, strictly adhering to the fan laws.  
Use Table 31 to locate the DD nearest to 4.21 in. Close the  
sheave to 1 turn open.  
New BHP  
= (Speed increase)3• BHP at 3,800 CFM  
At unit start-up, the measured CFM may be higher or lower  
than the required CFM. To achieve the required CFM, the  
speed of the drive may have adjusted by changing the datum  
diameter (DD) of the variable pitch motor sheave as  
described below:  
= (Speed increase)3 • Original BHP  
= New BHP  
Required CFM  
Measured CFM  
New motor Amps  
(
• Existing DD = New DD  
)
= (Speed increase)3• Amps at 3,800 CFM  
Use the following tables and the DD calculated per the above  
equation to adjust the motor variable pitch sheave.  
= (Speed increase)3 • Original Amps  
= New Amps  
32  
Unitary Products Group  
   
035-17311-002-A-0803  
TABLE 30: ADDITIONAL STATIC RESISTANCE  
Electric Heat KW†  
24  
*
† ‡  
CFM  
Cooling Only  
Economizer  
9
18  
36  
54  
2300  
2500  
2700  
2900  
3100  
3300  
3500  
3700  
3900  
4100  
4300  
4500  
4700  
4900  
5100  
5300  
5500  
5700  
5900  
6100  
6300  
0.08  
0.09  
0.11  
0.12  
0.14  
0.16  
0.18  
0.20  
0.23  
0.25  
0.28  
0.30  
0.33  
0.36  
0.39  
0.42  
0.45  
0.48  
0.52  
0.56  
0.60  
0.02  
0.02  
0.03  
0.03  
0.03  
0.03  
0.04  
0.04  
0.04  
0.04  
0.05  
0.05  
0.05  
0.05  
0.06  
0.06  
0.06  
0.06  
0.07  
0.07  
0.07  
0.07  
0.08  
0.09  
0.10  
0.12  
0.13  
0.15  
0.17  
0.19  
0.21  
0.23  
0.25  
0.28  
0.30  
0.33  
0.35  
0.38  
0.41  
0.44  
0.47  
0.50  
0.08  
0.09  
0.10  
0.11  
0.13  
0.14  
0.16  
0.18  
0.20  
0.22  
0.24  
0.26  
0.29  
0.31  
0.34  
0.37  
0.40  
0.43  
0.46  
0.49  
0.53  
0.09  
0.10  
0.12  
0.13  
0.15  
0.17  
0.19  
0.21  
0.23  
0.25  
0.28  
0.30  
0.33  
0.35  
0.38  
0.41  
0.44  
0.47  
0.50  
0.53  
0.56  
0.10  
0.11  
0.13  
0.14  
0.16  
0.18  
0.20  
0.22  
0.24  
0.26  
0.29  
0.31  
0.34  
0.37  
0.40  
0.43  
0.46  
0.49  
0.53  
0.56  
0.59  
0.13  
0.14  
0.16  
0.18  
0.20  
0.22  
0.24  
0.26  
0.28  
0.31  
0.34  
0.37  
0.40  
0.43  
0.46  
0.49  
0.53  
0.56  
0.59  
0.62  
0.65  
*.  
Add these resistance values to the available static resistance in the respective Blower Performance Tables.  
†.  
‡.  
Deduct these resistance values from the available external static pressure shown in the respective Blower Performance Table.  
The pressure drop through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return  
air duct system is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.  
OPERATION  
TABLE 31: MOTOR SHEAVE DATUM DIAMETERS  
1VM50x7/8  
(1-1/2, 2 & 3 HP Motor)  
1VP56x1-1/8  
(5 HP Motor)  
SEQUENCE OF OPERATIONS OVERVIEW  
Datum  
Turns Open  
Datum  
Diameter  
Turns Open  
®
For the Predator series of units, the thermostat makes a cir-  
Diameter  
cuit between "R" and "Y1" for the first stage of cooling.  
0
1/2  
1
4.4  
4.3  
4.2  
4.1  
4.0  
3.9  
3.8  
3.7  
3.6  
3.5  
3.4  
1
1-1/2  
2
5.3  
5.2  
The call is passed to the Unit Control Board (UCB), which  
then determines whether the requested operation is available  
and, if so, which components to energize.  
5.1  
1-1/2  
2
2-1/2  
3
5.0  
4.9  
When the "W1" call is sensed, the indoor air blower is ener-  
gized following a specified heating delay.  
2-1/2  
3
3-1/2  
4
4.8  
4.7  
If at any time a call for both heating and cooling are present,  
the heating operation will be performed. If operating, the cool-  
ing system is halted as with a completion of a call for cooling.  
Heating always takes priority.  
3-1/2  
4
4-1/2  
5
4.6  
4.5  
4-1/2  
5
5-1/2  
6
4.4  
4.3  
Unitary Products Group  
33  
         
035-17311-002-A-0803  
pleted. The UCB energizes the blower motor (if the fan switch  
on the room thermostat is set in the "AUTO" position) and  
drives the economizer dampers from fully closed to their min-  
imum position. If the enthalpy of the outdoor air is below the  
set point of the enthalpy controller (previously determined),  
"Y1" energizes the economizer. The dampers will modulate to  
maintain a constant supply air temperature as monitored by  
the discharge air sensor. If the outdoor air enthalpy is above  
the set point, "Y1" energizes compressor #1.  
COOLING SEQUENCE OF OPERATION  
CONTINUOUS BLOWER  
By setting the room thermostat fan switch to "ON," the supply  
air blower will operate continuously.  
INTERMITTENT BLOWER  
With the room thermostat fan switch set to "AUTO" and the  
system switch set to either the "AUTO" or "HEAT" settings,  
the blower is energized whenever a cooling or heating opera-  
tion is requested. The blower is energized after any specified  
delay associated with the operation.  
When the thermostat calls for "second-stage" cooling, the low  
voltage control circuit from "R" to "Y2" is completed. The UCB  
energizes the first available compressor. If the enthalpy of the  
outdoor air is below the set point of the enthalpy controller  
(i.e. first stage has energized the economizer), "Y2" will ener-  
gize compressor #1. If the outdoor air is above the set point,  
"Y2" will energize compressor #2.  
When energized, the indoor blower has a minimum run time  
of 30 seconds. Additionally, the indoor blower has a delay of  
10 seconds between operations.  
Once the thermostat has been satisfied, it will de-energize  
“Y1” and “Y2”. If the compressors have satisfied their mini-  
mum run times, the compressors and condenser fans are de-  
energized. Otherwise, the unit operates each cooling system  
until the minimum run times for the compressors have been  
completed. Upon the final compressor de-energizing, the  
blower is stopped following the elapse of the fan off delay for  
cooling, and the economizer damper goes to the closed posi-  
tion. If the unit is in continues fan operation, the economizer  
damper goes to the minimum position.  
NO OUTDOOR AIR OPTIONS  
When the thermostat calls for the first stage of cooling, the  
low-voltage control circuit from “R” to “Y1” and “G” is com-  
pleted. The UCB energizes the economizer (if installed and  
free cooling is available) or the first available compressor*  
and the condenser fans. For first stage cooling, compressor  
#1 is energized. If compressor #1 is unavailable, compressor  
#2 is energized. After completing the specified fan on delay  
for cooling, the UCB will energize the blower motor.  
ECONOMIZER WITH DUAL ENTHALPY SENSORS -  
When the thermostat calls for the second stage of cooling,  
the low-voltage control circuit from “R” to “Y2” is completed.  
The control board energizes the first available compressor. If  
free cooling is being used for the first stage of cooling, com-  
pressor #1 is energized. If compressor #1 is active for first  
stage cooling or the first compressor is locked-out, compres-  
sor #2 is energized. In free-cooling mode, if the call for the  
second stage of cooling continues for 20 minutes, compres-  
sor #2 is energized, provided it has not been locked-out.  
The operation with the dual enthalpy sensors is identical to  
the single sensor except that a second enthalpy sensor is  
mounted in the return air. This return air sensor allows the  
economizer to choose between outdoor air and return air,  
whichever has the lowest enthalpy value, to provide maxi-  
mum operating efficiency.  
ECONOMIZER WITH POWER EXHAUST -  
A unit equipped with an economizer (single or dual enthalpy)  
and a power exhaust operates as specified above with one  
addition. The power exhaust motor is energized 45 seconds  
after the actuator position exceeds the exhaust fan set point  
on the economizer control. When the power exhaust is oper-  
ating, the second stage of mechanical cooling will not oper-  
ate. As always, the "R" to "G" connection provides minimum  
position but does not provide power exhaust operation.  
If there is an initial call for both stages of cooling, the UCB will  
delay energizing compressor #2 by 30 seconds in order to  
avoid a power rush.  
Once the thermostat has been satisfied, it will de-energize Y1  
and Y2. If the compressors have satisfied their minimum run  
times, the compressors and condenser fans are de-ener-  
gized. Otherwise, the unit operates each cooling system until  
the minimum run times for the compressors have been com-  
pleted. Upon the final compressor de-energizing, the blower  
is stopped following the elapse of the fan off delay for cooling.  
MOTORIZED OUTDOOR AIR DAMPERS -  
This system operation is the same as the units with no out-  
door air options with one exception. When the "R" to "G" cir-  
cuit is complete, the motorized damper drives open to a  
position set by the thumbwheel on the damper motor. When  
the "R" to "G" circuit is opened, the damper spring returns  
fully closed.  
* To be available, a compressor must not be locked-out due  
to a high or low-pressure switch or freezestat trip and the  
Anti-Short Cycle Delay (ASCD) must have elapsed.  
ECONOMIZER WITH SINGLE ENTHALPY SENSOR -  
When the room thermostat calls for "first-stage" cooling, the  
low voltage control circuit from "R" to "G" and "Y1" is com-  
34  
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035-17311-002-A-0803  
COOLING OPERATION ERRORS  
LOW AMBIENT COOLING  
To determine when to operate in low ambient mode, the UCB  
has a pair of terminals connected to a temperature-activated  
switch set at 45ºF. When the low ambient switch is closed  
and the thermostat is calling for cooling, the UCB will operate  
in the low ambient mode.  
Each cooling system is monitored for operation outside of the  
intended parameters. Errors are handled as described below.  
All system errors override minimum run times for compres-  
sors.  
HIGH-PRESSURE LIMIT SWITCH  
Low ambient mode operates the compressors in this manner:  
10 minutes on, 5 minutes off. The indoor blower is operated  
throughout the cycle. The 5-minute off period is necessary to  
defrost the indoor coil.  
During cooling operation, if a high-pressure limit switch  
opens, the UCB will de-energize the associated compressor,  
initiate the ASCD (Anti-short cycle delay), and, if the other  
compressor is idle, stop the condenser fans. If the call for  
cooling is still present at the conclusion of the ASCD, the  
UCB will re-energize the halted compressor.  
Low ambient mode always begins with compressor opera-  
tion. Compressor minimum run time may extend the minutes  
of compressor operation. The defrost cycle will begin immedi-  
ately following the elapse of the minimum run time.  
Should a high-pressure switch open three times within two  
hours of operation, the UCB will lock-out the associated com-  
pressor and flash a code (see 37). If the other compressor is  
inactive, the condenser fans will be de-energized.  
When operating in low ambient mode, the UCB will not lock-  
out the compressors due to a freezestat trip. However, a  
freezestat trip will de-energize the associated compressor. If  
the call for cooling is still present at the end of the ASCD and  
the freezestat has closed, the unit will resume operation.  
LOW-PRESSURE LIMIT SWITCH  
The low-pressure limit switch is not monitored during the ini-  
tial 30 seconds of a cooling system's operation. For the fol-  
lowing 30 seconds, the UCB will monitor the low-pressure  
switch to ensure it closes. If the low-pressure switch fails to  
close after the 30-second monitoring phase, the UCB will de-  
energize the associated compressor, initiate the ASCD, and,  
if the other compressor is idle, stop the condenser fans.  
SAFETY CONTROLS  
The unit control board monitors the following inputs for each  
cooling system:  
1. A suction line freezestat to protect against low evapora-  
tor temperatures due to a low airflow or a low return air  
temperature, (opens at 26 ± 5 °F and resets at 38 ± 5°F).  
Once the low-pressure switch has been proven (closed dur-  
ing the 30-second monitor period described above), the UCB  
will monitor the low-pressure limit switch for any openings. If  
the low-pressure switch opens for greater than 5 seconds,  
the UCB will de-energize the associated compressor, initiate  
the ASCD, and, if the other compressor is idle, stop the con-  
denser fans.  
2. A high-pressure switch to protect against excessive dis-  
charge pressures due to a blocked condenser coil or a  
condenser motor failure, (opens at 405 ± 10 psig or 440  
± 10 psig depending on unit model).  
3. A low-pressure switch to protect against loss of refriger-  
ant charge, (opens at 7 ± 3 psig or 22 ± 5 psig).  
If the call for cooling is still present at the conclusion of the  
ASCD, the UCB will re-energize the halted compressor.  
The above pressure switches are hard-soldered to the unit.  
The refrigeration systems are independently monitored and  
controlled. On any fault, only the associated system will be  
affected by any safety/preventive action. The other refrigerant  
system will continue in operation unless it is affected by the  
fault as well.  
Should a low-pressure switch open three times within one  
hour of operation, the UCB will lock-out the associated com-  
pressor and flash a code (37). If the other compressor is inac-  
tive, the condenser fans will be de-energized.  
The unit control board monitors the temperature limit switch  
of electric heat units and the temperature limit switch and the  
gas valve of gas furnace units.  
FREEZESTAT  
During cooling operation, if a freezestat opens, the UCB will  
de-energize the associated compressor, initiate the ASCD,  
and, if the other compressor is idle, stop the condenser fans.  
If the call for cooling is still present at the conclusion of the  
ASCD, the UCB will re-energize the halted compressor.  
COMPRESSOR PROTECTION  
In addition to the external pressure snitches, the compres-  
sors also have inherent (internal) protection. If there is an  
abnormal temperature rise in a compressor, the protector will  
open to shut down the compressor. The UCB incorporates  
features to minimize compressor wear and damage. An Anti-  
Short Cycle Delay (ASCD) is utilized to prevent operation of  
Should a freezestat open three times within two hours of  
operation, the UCB will lock-out the associated compressor  
and flash a code (37). If the other compressor is inactive, the  
condenser fans will be de-energized.  
Unitary Products Group  
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035-17311-002-A-0803  
a compressor too soon after its previous run. Additionally, a  
minimum run time is imposed any time a compressor is ener-  
gized.  
Limit Setting Table 32. It resets automatically. The limit switch  
operates when a high temperature condition, caused by inad-  
equate supply air flow occurs, thus shutting down the heater  
and energizing the blower.  
The ASCD is initiated on unit start-up and on any compressor  
reset or lock-out.  
TABLE 32: ELECTRIC HEAT LIMIT SETTING  
FLASH CODES  
LIMIT  
UNIT (TONS)  
VOLTAGE  
HEATER kW  
SWITCH  
OPENS °F  
The UCB will initiate a flash code associated with errors  
within the system. Refer to UNIT CONTROL BOARD FLASH  
7.5  
9
150  
150  
150  
150  
130  
RESET  
7.5, 10, 12.5  
7.5, 10, 12.5  
7.5, 10, 12.5  
10, 12.5  
18  
24  
34  
54  
Remove the call for cooling, by raising thermostat setting  
higher than the conditioned space temperature. This resets  
any pressure or freezestat flash codes.  
380  
ELECTRIC HEATING SEQUENCE OF OPERATIONS  
The following sequence describes the operation of the elec-  
tric heat section.  
FLASH CODES  
The UCB will initiate a flash code associated with errors  
within the system. Refer to UNIT CONTROL BOARD FLASH  
CODES Table 37.  
Two-stage heating:  
a. Upon a call for first stage heat by the thermostat, the  
heater relay (RA) will be energized. After completing  
the specified fan on delay for heating, the UCB will  
energize the blower motor. If the second stage of  
heat is required, heater relay (RB) will be energized.  
After completing the specified fan on delay for heat-  
ing, the UCB will energize the blower motor.  
RESET  
Remove the call for heating by lowering the thermostat set-  
ting lower than the conditioned space temperature.This  
resets any flash codes.  
ELECTRIC HEAT ANTICTPATOR SETPOINTS  
b. The thermostat will cycle the electric heat to satisfy  
the heating requirements of the conditioned space.  
It is important that the anticipator setpoint be correct. Too  
high of a setting will result in longer heat cycles and a greater  
temperature swing in the conditioned space. Reducing the  
value below the correct setpoint will give shorter “ON” cycles  
and may result in the lowering of the temperature within the  
conditioned space. Refer to Table 33 for the required electric  
heat anticipator setting.  
ELECTRIC HEATING OPERATION ERRORS  
TEMPERATURE LIMIT  
If the UCB senses zero volts from the high temperature limit,  
the indoor blower motor is immediately energized.  
TABLE 33: ELECTRIC HEAT ANTICIPATOR  
SETPOINTS  
This limit is monitored regardless of unit operation status, i.e.  
the limit is monitored at all times.  
SETTING, AMPS  
If the temperature limit opens three times within one hour, it  
will lock-on the indoor blower motor and a flash code is initi-  
ated (See Table 37).  
W1  
W2  
0.13  
0.1  
SAFETY CONTROLS  
The UCB monitors the temperature limit switch of electric  
heat units.  
The control circuit includes the following safety controls:  
LIMIT SWITCH (LS)  
This control is located inside the heater compartment and is  
set to open at the temperature indicated in the Electric Heat  
36  
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035-17311-002-A-0803  
OPERATING INSTRUCTIONS  
START-UP (COOLING)  
1. Turn unit electrical power on.  
PRESTART CHECK LIST  
NOTE: Prior to each cooling season, the crankcase heaters  
must be energized at least 10 hours before the sys-  
tem is put into operation.  
After installation has been completed:  
1. Check the electrical supply voltage being supplied. Be  
sure that it is the same as listed on the unit nameplate.  
2. Set the room thermostat setting to lower than the room  
temperature.  
2. Set the room thermostat to the off position.  
3. Turn unit electrical power on.  
3. First stage compressors will energize after the built-in  
time delay (five minutes).  
4. The second stage of the thermostat will energize second  
stage compressor if needed.  
4. Set the room thermostat fan switch to on.  
5. Check indoor blower rotation.  
POST START CHECK LIST  
1. Verify proper system pressures for both circuits.  
If blower rotation is in the wrong direction. Refer to  
Phasing Section in general information section.  
2. Measure the temperature drop across the evaporator  
coil.  
Check blower drive belt tension.  
CHARGING THE UNIT  
6. Check the unit supply air (CFM).  
These units should be charged using the superheat method.  
Super heat charging data is shown in Tables 34 thru 36.  
7. Measure evaporator fan motor's amp draw.  
8. Set the room thermostat fan switch to off.  
9. Turn unit electrical power off.  
When charging each system, superheat data should be taken  
at the compressor inlet.  
TABLE 34: 7.5 TON STANDARD EFFICIENCY SUPERHEAT CHARGING  
Superheat at Compressor Suction (°F)  
Airflow = 3000 CFM  
Outdoor  
Temp (°F)  
Indoor WB Temp (°F)  
55  
57  
59  
16.3  
13.8  
11.3  
8.9  
6.4  
5.8  
5.3  
-
61  
19.1  
16.5  
13.9  
11.4  
8.8  
7.9  
7.1  
6.3  
5.5  
-
63  
65  
24.8  
22.0  
19.2  
16.3  
13.5  
12.2  
10.8  
9.0  
67  
69  
71  
73  
75  
65  
70  
10.6  
13.5  
22.0  
19.3  
16.6  
13.9  
11.1  
10.1  
9.0  
27.7  
24.7  
21.8  
18.8  
15.9  
14.3  
12.7  
10.4  
8.1  
29.1  
26.5  
24.0  
21.4  
18.9  
17.2  
15.6  
13.5  
11.4  
9.3  
30.5  
28.4  
26.2  
24.0  
21.9  
20.2  
18.5  
16.6  
14.6  
12.7  
10.8  
32.0  
30.2  
28.4  
26.6  
24.8  
23.1  
21.5  
19.7  
17.9  
16.1  
14.3  
33.4  
32.0  
30.6  
29.2  
27.8  
26.1  
24.4  
22.8  
21.2  
19.5  
17.9  
8.4  
11.1  
75  
6.1  
8.7  
80  
-
-
-
-
-
-
-
-
6.4  
85  
-
-
-
-
-
-
-
90  
95  
100  
105  
110  
115  
7.7  
-
6.4  
7.3  
-
5.1  
5.5  
5.9  
-
-
-
-
-
7.2  
Unitary Products Group  
37  
           
035-17311-002-A-0803  
TABLE 35: 10 TON STANDARD EFFICIENCY SUPERHEAT CHARGING  
Superheat at Compressor Suction (°F)  
Airflow = 4000 CFM  
Outdoor  
Temp (°F)  
Indoor WB Temp (°F)  
55  
57  
59  
61  
23.2  
19.0  
14.7  
10.5  
6.3  
5.6  
-
63  
65  
25.6  
22.0  
18.4  
14.8  
11.1  
9.9  
8.7  
6.7  
-
67  
69  
28.4  
25.4  
22.4  
19.5  
16.5  
15.0  
13.4  
10.8  
8.1  
71  
73  
75  
65  
70  
19.6  
20.8  
22.0  
24.4  
20.5  
16.6  
12.6  
8.7  
7.8  
6.8  
5.3  
-
26.9  
23.5  
20.2  
16.9  
13.6  
12.0  
10.5  
8.1  
29.9  
27.3  
24.7  
22.0  
19.4  
17.9  
16.3  
13.5  
10.6  
7.7  
31.4  
29.2  
26.9  
24.6  
22.4  
20.8  
19.3  
16.2  
13.1  
10.0  
6.9  
32.9  
31.0  
29.1  
27.2  
25.3  
23.7  
22.2  
18.9  
15.5  
12.2  
8.9  
14.4  
16.0  
17.5  
75  
9.3  
11.1  
12.9  
80  
-
-
-
-
-
-
-
-
6.3  
8.4  
85  
-
-
-
-
-
-
-
-
-
-
-
-
-
-
90  
95  
100  
105  
110  
115  
-
-
5.7  
-
-
-
-
5.5  
-
-
-
-
-
-
TABLE 36: 12.5 TON STANDARD EFFICIENCY SUPERHEAT CHARGING  
Superheat at Compressor Suction (°F)  
Airflow = 5000 CFM  
Outdoor  
Temp (°F)  
Indoor WB Temp (°F)  
55  
33.6  
29.6  
25.6  
21.6  
17.6  
11.6  
5.6  
-
57  
34.2  
30.4  
26.6  
22.8  
19.0  
13.4  
7.8  
6.1  
-
59  
34.7  
31.1  
27.5  
24.0  
20.4  
15.2  
10.0  
7.8  
61  
35.3  
31.9  
28.5  
25.1  
21.7  
16.9  
12.1  
9.4  
63  
65  
36.4  
33.4  
30.5  
27.5  
24.5  
20.5  
16.5  
12.8  
9.1  
67  
69  
71  
73  
75  
65  
70  
35.9  
32.7  
29.5  
26.3  
23.1  
18.7  
14.3  
11.1  
7.9  
37.0  
34.2  
31.4  
28.6  
25.9  
22.3  
18.7  
14.5  
10.3  
6.1  
37.3  
34.7  
32.2  
29.7  
27.2  
24.3  
21.3  
17.5  
13.8  
10.0  
6.2  
37.5  
35.3  
33.0  
30.8  
28.5  
26.3  
24.0  
20.6  
17.2  
13.8  
10.4  
37.8  
35.8  
33.8  
31.8  
29.9  
28.3  
26.7  
23.7  
20.7  
17.6  
14.6  
38.0  
36.3  
34.6  
32.9  
31.2  
30.3  
29.4  
26.7  
24.1  
21.5  
18.8  
75  
80  
85  
90  
95  
100  
105  
110  
115  
-
5.5  
6.7  
-
-
-
-
-
5.4  
-
-
-
-
-
-
-
38  
Unitary Products Group  
   
035-17311-002-A-0803  
NORMAL MAINTENANCE  
TROUBLESHOOTING  
Troubleshooting of components may require open-  
ing the electrical control box with the power con-  
nected to the unit. Use extreme care when  
working with live circuits! Check the unit name-  
plate for the correct line voltage and set the voltme-  
ter to the correct range before making any  
connections with line terminals.  
Prior to any of the following maintenance proce-  
dures, shut off all power to the unit to prevent per-  
sonal injury.  
Periodic maintenance normally consists of chang-  
ing or cleaning filters.  
When not necessary, shut off all electric power to the  
unit prior to any of the following maintenance proce-  
dures so as to prevent personal injury.  
GENERAL  
FILTERS  
Inspect once a month. Replace disposable or clean perma-  
nent type as necessary. DO NOT replace permanent type  
with disposable.  
Label all wires prior to disconnection when servicing  
controls. Wiring errors can cause improper and dan-  
gerous operation which could cause injury to person  
and/or damage unit components. Verify proper oper-  
ation after servicing.  
MOTORS  
Indoor fan and outdoor fan motors are permanently lubricated  
and require no maintenance.  
OUTDOOR COIL  
Dirt should not be allowed to accumulate on the outdoor coil  
surface or other parts in the air circuit. Cleaning should be as  
often as necessary to keep coil clean. Use a brush, vacuum  
cleaner attachment, or other suitable means. If water is used  
to clean coil, be sure power to the unit is shut off prior to  
cleaning. Service access is provided in the front and rear  
condenser compartment panels to provide improved access  
PREDATOR® FLASH CODES  
Various flash codes are utilized by the unit control board  
(UCB) to aid troubleshooting. Flash codes are distinguished  
by the short on and off cycle used (approximately 200ms on  
and 200ms off). To show normal operation, the control board  
flashes a 1 second on, 1 second off “heartbeat” during normal  
operation. This is to verify that the UCB is functioning cor-  
rectly. Do not confuse this with an error flash code. To prevent  
confusion, a 1-flash, flash code is not used.  
to the condenser coils.  
Current alarms are flashed on the UCB LED. The alarm his-  
tory can be checked by pressing and releasing the ALARMS  
button on the UCB. The UCB will cycle through the last five  
(5) alarms, most recent to oldest, separating each alarm flash  
code by approximately 2 seconds.  
Do not remove service panels or attempt to clean  
the interior of the condenser section when the unit  
is powered and/or operating. Shut off all power to  
the unit prior to cleaning or maintenance of the  
condenser section internals.  
In some cases, it may be necessary to “zero” the ASCD for  
the compressors in order to perform troubleshooting. To reset  
all ASCDs for one cycle, press and release the UCB TEST  
button once.  
NOTE: Exercise care when cleaning the coil so that the coil  
fins are not damaged. Do not permit the outdoor air  
discharge to be obstructed by overhanging struc-  
tures of shrubs.  
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TABLE 37: UNIT CONTROL BOARD FLASH CODES  
Flash Code  
Description  
Control Failure - Replace Control  
Normal Operation  
On Steady  
Heart Beat  
1 Flash  
Not Applicable  
*
2 Flashes  
3 Flashes  
4 Flashes  
5 Flashes  
6 Flashes  
7 Flashes  
8 Flashes  
Control waiting ASCD  
HPS1 - Compressor Lock out  
HPS2 - Compressor Lock out  
LPS1 - Compressor Lock out  
LPS2 - Compressor Lock out  
FS1 - Compressor Lock out  
FS2 - Compressor Lock out  
Ignition Control Locked Out/  
9 Flashes  
10 Flashes  
11 Flashes  
Ignition Control Failure / Limit Switch Trip / No Jumper Plug in Heat Section  
Compressors Locked Out On Low  
*
Outdoor Air Temperature  
Compressors Locked Out Because The  
*
Economizer Is Using Free Cooling  
12 Flashes  
13 Flashes  
14 Flashes  
OFF  
Fan Overload Switch Trip - Not Applicable On This Unit *  
Compressor Held Off Due To Low Voltage*  
EEPROM Storage Failure (Control Failure)  
No Power or Control Failure  
*.  
These flash codes do not represent alarms.  
Monitored  
No  
Loss of  
Call for  
Heating?  
No  
Yes  
No  
Call for  
Heating?  
Systems  
Programming?  
Yes  
Heat Off  
Problem?  
Yes  
Yes  
No  
Program  
Unit  
Control  
Board  
Call for 2nd  
Stage  
Cooling  
Call for  
Heat  
Trip/Failure  
No  
Yes  
Energize ID  
Call for  
First  
Monitor  
Blower Motor  
Cooling?  
Stage?  
Yes  
No  
Yes  
No  
Call for 1st  
Stage  
Cooling  
No  
Yes  
Turn off ID  
Blower Motor  
Fan on  
>30 secs?  
Fan off  
>10 secs?  
Yes  
Yes  
No  
No  
No  
Yes  
Lossof Call  
for ID Blower?  
Call for  
ID Blower?  
Loss of Call  
for Cooling?  
Cool Off  
FIGURE 24 - BASIC TROUBLESHOOTING FLOWCHART  
40  
Unitary Products Group  
     
035-17311-002-A-0803  
On calls for cooling, the supply air blower motor is operating  
but compressor #1 is not (the room thermostat fan switch is in  
the “AUTO” position):  
COOLING TROUBLESHOOTING GUIDE  
On calls for cooling, if the compressors are operating but the  
supply air blower motor does not energize after a short delay  
(the room thermostat fan switch is in the “AUTO” position):  
1. If installed, check the position of the economizer blades.  
If the blades are open, the economizer is providing free  
cooling and the compressors will not immediately oper-  
ate. If both stages of cooling are requested simulta-  
neously and the economizer provides free cooling,  
following a short delay compressor #1 will be energized  
unless it is locked out. If compressor #1 is locked out,  
compressor #2 is energized. Compressor #2 is always  
energized in place of compressor #1 when compressor  
#1 is requested but locked out.  
1. Turn the thermostat fan switch to the ON position. If the  
supply air blower motor does not energize, go to Step 3.  
2. If the blower motor runs with the fan switch in the ON  
position but will not run after the first compressor has  
energized when the fan switch is in the AUTO position,  
check the room thermostat for contact between R and G  
in the AUTO position during calls for cooling.  
3. If the supply air blower motor does not energize when  
the fan switch is set to ON, check that line voltage is  
being supplied to the contacts of the M3, contactor, and  
that the contactor is pulled in. Check for loose wiring  
between the contactor and the supply air blower motor.  
2. If no economizer is installed or the economizer is not  
opening to provide free cooling and compressor #1 does  
not energize on a call for cooling, check for line voltage  
at the compressor contactor, M1, and that the contactor  
is pulled in. Check for loose wiring between the contac-  
tor and the compressor.  
4. If M3 is pulled in and voltage is supplied to M3, lightly  
touch the supply air blower motor housing. If it is hot, the  
motor may be off on internal protection. Cancel any  
thermostat calls and set the fan switch to AUTO. Wait for  
the internal overload to reset. Test again when cool.  
3. If M1 is pulled in and voltage is supplied at M1, lightly  
touch the compressor housing. If it is hot, the compres-  
sor may be off on inherent protection. Cancel any calls  
for cooling and wait for the internal overload to reset.  
Test again when cool.  
5. If M3 is not pulled in, check for 24 volts at the M3 coil. If  
24 volts are present at M3 but M3 is not pulled in,  
replace the contactor.  
4. If M1 is not pulled in, check for 24 volts at the M1 coil. If  
24 volts are present and M1 is not pulled in, replace the  
contactor.  
6. Failing the above, if there is line voltage supplied at M3,  
M3 is pulled in, and the supply air blower motor still does  
not operate, replace the motor.  
5. Failing the above, if voltage is supplied at M1, M1 is  
pulled in, and the compressor still does not operate,  
replace the compressor.  
7. If 24 volts is not present at M3, check that 24 volts is  
present at the UCB supply air blower motor terminal,  
“FAN”. If 24 volts is present at the FAN, check for loose  
wiring between the UCB and M3.  
6. If 24 volts is not present at M1, check for 24 volts at the  
UCB terminal, C1. If 24 volts is present, check for loose  
wiring between C1 and the compressor contactor.  
8. If 24 volts is not present at the “FAN” terminal, check for  
24 volts from the room thermostat. If 24 volts are not  
present from the room thermostat, check for the follow-  
ing:  
7. If 24 volts is not present at the C1 terminal, check for 24  
volts from the room thermostat at the UCB Y1 terminal.  
If 24 volts is not present from the room thermostat, check  
for the following:  
a. Proper operation of the room thermostat (contact  
between R and G with the fan switch in the ON posi-  
tion and in the AUTO position during operation  
calls).  
a. 24 volts at the thermostat Y1 terminal  
b. Proper wiring between the room thermostat and the  
UCB, i.e. Y1 to Y1, Y2 to Y2, and  
b. Proper wiring between the room thermostat and the  
UCB, and  
c. Loose wiring from the room thermostat to the UCB  
8. If 24 volts is present at the UCB Y1 terminal, the com-  
pressor may be out due to an open high-pressure switch,  
low-pressure switch, or freezestat. Check for 24 volts at  
the HPS1, LPS1, and FS1 terminals of the UCB. If a  
switch has opened, there should be a voltage potential  
between the UCB terminals, e.g. if LPS1 has opened,  
there will be a 24-volt potential between the LPS1 termi-  
nals.  
c. Loose wiring from the room thermostat to the UCB  
9. If 24 volts is present at the room thermostat but not at the  
UCB, check for proper wiring between the thermostat  
and the UCB, i.e. that the thermostat G terminal is con-  
nected to the G terminal of the UCB, and for loose wir-  
ing.  
10. If the thermostat and UCB are properly wired, replace  
the UCB.  
9. If 24 volts is present at the UCB Y1 terminal and none of  
the protection switches have opened, the UCB may have  
Unitary Products Group  
41  
 
035-17311-002-A-0803  
locked out the compressor for repeat trips. The UCB  
should be flashing an alarm code. If not, press and  
release the ALARMS button on the UCB. The UCB will  
flash the last five alarms on the LED. If the compressor  
is locked out, cancel any call for cooling. This will reset  
any compressor lock outs.  
16. If none of the above correct the error, replace the UCB.  
On calls for the second stage of cooling, the supply air blower  
motor and compressor #1 are operating but compressor #2 is  
not (the room thermostat fan switch is in the “AUTO” posi-  
tion):  
NOTE: While the above step will reset any lockouts, com-  
pressor #1 may be held off for the ASCD. See the  
next step.  
1. If installed, check the position of the economizer blades.  
If the blades are open, the economizer is providing free  
cooling. If the second stage of cooling is requested, fol-  
lowing a short delay, compressor #1 will be energized  
unless it is locked out. Typically, compressor #2 is ener-  
gized only during free cooling if the call for the second  
stage of cooling persists for 20 minutes.  
10. If 24 volts is present at the UCB Y1 terminal and none of  
the switches are open and the compressor is not locked  
out, the UCB may have the compressor in an ASCD.  
Check the LED for an indication of an ASCD cycle. The  
ASCD should time out within 5 minutes. Press and  
release the TEST button to reset all ASCDs.  
2. Compressor #2 will not energize simultaneously with  
compressor #1 if a call for both stages of cooling is  
received. The UCB delays compressor #2 by 30 sec-  
onds to prevent a power surge. If after the delay com-  
pressor #2 does not energize on a second stage call for  
cooling, check for line voltage at the compressor contac-  
tor, M2, and that the contactor is pulled in. Check for  
loose wiring between the contactor and the compressor.  
11. If 24 volts is present at the UCB Y1 terminal and the  
compressor is not out due to a protective switch trip,  
repeat trip lock out, or ASCD, the economizer terminals  
of the UCB may be improperly wired. Check for 24 volts  
at the Y1 “OUT” terminal of the UCB. If 24 volts is  
present, trace the wiring from Y1 “OUT” for incorrect wir-  
ing. If 24 volts is not present at the Y1 “OUT” terminal,  
the UCB must be replaced.  
3. If M2 is pulled in and voltage is supplied at M2, lightly  
touch the compressor housing. If it is hot, the compres-  
sor may be off on inherent protection. Cancel any calls  
for cooling and wait for the internal overload to reset.  
Test again when cool.  
12. For units without economizers: If 24 volts is present at  
the Y1 OUT terminal, check for 24 volts at the Y1  
“ECON” terminal. If 24 volts is not present, check for  
loose wiring from the Y1 “OUT” terminal to the Mate-N-  
Lock plug, the jumper in the Mate-N-Lock plug, and in  
the wiring from the Mate-N-Lock plug to the Y1 “ECON”  
terminal.  
4. If M2 is not pulled in, check for 24 volts at the M2 coil. If  
24 volts is present and M2 is not pulled in, replace the  
contactor.  
5. Failing the above, if voltage is supplied at M2, M2 is  
pulled in, and the compressor still does not operate,  
replace the compressor.  
13. For units with economizers: If 24 volts is present at the  
Y1 “OUT” terminal, check for 24 volts at the Y1 “ECON”  
terminal. If 24 volts is not present, check for loose wiring  
from the Y1 “OUT” terminal to the Mate-N-Lock plug, a  
poor connection between the UCB and economizer  
Mate-N-Lock plugs, loose wiring from the Mate-N-Lock  
plug to the economizer, back to the Mate-N-Lock plug,  
and from the Mate-N-Lock plug to the Y1 “ECON” termi-  
nal. If nothing is found, the economizer control may have  
faulted and is failing to return the 24-volt “call” to the Y1  
“ECON” terminal even though the economizer is not pro-  
viding free cooling. To test, disconnect the Mate-N-Locks  
and jumper between the WHITE and YELLOW wires of  
the UCB’s Mate-N-Lock plug. If compressor #1 ener-  
gizes, there is a fault in the economizer wiring or the  
economizer control.  
6. If 24 volts is not present at M2, check for 24 volts at the  
UCB terminal, C2. If 24 volts are present, check for  
loose wiring between C2 and the compressor contactor.  
7. If 24 volts is not present at the C2 terminal, check for 24  
volts from the room thermostat at the UCB Y2 terminal.  
If 24 volts is not present from the room thermostat, check  
for the following:  
a. 24 volts at the thermostat Y2 terminal  
b. Proper wiring between the room thermostat and the  
UCB, i.e. Y1 to Y1, Y2 to Y2, and  
c. Loose wiring from the room thermostat to the UCB  
8. If 24 volts is present at the UCB Y2 terminal, the com-  
pressor may be out due to an open high-pressure switch,  
low-pressure switch, or freezestat. Check for 24 volts at  
the HPS2, LPS2, and FS2 terminals of the UCB. If a  
switch has opened, there should be a voltage potential  
between the UCB terminals, e.g. if LPS2 has opened,  
there will be 24 volts of potential between the LPS2 ter-  
minals.  
14. The UCB can be programmed to lock out compressor  
operation during free cooling and in low ambient condi-  
tions. These options are not enabled by default. Local  
York distributors can test the UCB for this programming.  
15. If none of the above corrected the error, test the integrity  
of the UCB. Disconnect the C1 terminal wire and jumper  
it to the Y1 terminal. DO NOT jump the Y1 to C1 termi-  
nals. If the compressor engages, the UCB has faulted.  
42  
Unitary Products Group  
035-17311-002-A-0803  
9. If 24 volts is present at the UCB Y2 terminal and none of  
the protection switches have opened, the UCB may have  
locked out the compressor for repeat trips. The UCB  
should be flashing a code. If not, press and release the  
ALARMS button on the UCB. The UCB will flash the last  
five alarms on the LED. If the compressor is locked out,  
6. If 24 volts is not present at M1, check for 24 volts at the  
UCB terminal, C1. If 24 volts is present, check for loose  
wiring between C1 and the compressor contactor.  
7. If 24 volts is not present at the C1 terminal, check for 24  
volts from the room thermostat at the UCB Y1 terminal.  
If 24 volts are not present at the UCB Y1 terminal, the  
UCB may have faulted. Check for 24 volts at the Y1  
ECON terminal. If 24 volts is not present at Y1 “ECON”,  
the UCB has faulted. The UCB should de-energize all  
compressors on a loss of call for the first stage of cool-  
ing, i.e. a loss if 24 volts at the Y1 terminal.  
remove any call for cooling at the thermostat or by dis-  
connecting the thermostat wiring at the Y2 UCB terminal.  
This will reset any compressor lock outs.  
NOTE: While the above step will reset any lock outs, com-  
pressor #1 will be held off for the ASCD, and com-  
pressor #2 may be held off for a portion of the  
ASCD. See the next step.  
8. If 24 volts are present at the UCB Y1 terminal, the com-  
pressor may be out due to an open high-pressure switch,  
low-pressure switch, or freezestat. Check for 24 volts at  
the HPS1, LPS1, and FS1 terminals of the UCB. If a  
switch has opened, there should be a voltage potential  
between the UCB terminals, e.g. if LPS1 has opened,  
there will be a 24-volt potential between the LPS1 termi-  
nals.  
10. If 24 volts is present at the UCB Y2 terminal and none of  
the switches are open and the compressor is not locked  
out, the UCB may have the compressor in an ASCD.  
Check the LED for an indication of an ASCD cycle. The  
ASCD should time out within 5 minutes. Press and  
release the TEST button to reset all ASCDs.  
9. If 24 volts is present at the UCB Y1 terminal and none of  
the protection switches have opened, the UCB may have  
locked out the compressor for repeat trips. The UCB  
should be flashing a code. If not, press and release the  
ALARMS button on the UCB. The UCB will flash the last  
five alarms on the LED. If the compressor is locked out,  
remove any call for cooling. This will reset any compres-  
sor lock outs.  
11. The UCB can be programmed to lock out compressor  
operation during free cooling and in low ambient condi-  
tions. These options are not enabled by default. Local  
York distributors can test the UCB for this programming.  
12. If none of the above corrected the error, test the integrity  
of the UCB. Disconnect the C2 terminal wire and jumper  
it to the Y2 terminal. DO NOT jump the Y2 to C2 termi-  
nals. If the compressor engages, the UCB has faulted.  
NOTE: While the above step will reset any lock outs, com-  
pressor #2 will be held off for the ASCD, and com-  
pressor #1 may be held off for a portion of the  
ASCD. See the next step.  
13. If none of the above correct the error, replace the UCB.  
On a call for cooling, the supply air blower motor and com-  
pressor #2 are operating but compressor #1 is not (the room  
thermostat fan switch is in the “AUTO” position):  
10. If 24 volts is present at the UCB Y1 terminal and none of  
the switches are open and the compressor is not locked  
out, the UCB may have the compressor in an ASCD.  
Check the LED for an indication of an ASCD cycle. The  
ASCD should time out within 5 minutes. Press and  
release the TEST button to reset all ASCDs.  
1. Compressor #2 is energized in place of compressor #1  
when compressor #1 is unavailable for cooling calls.  
Check the UCB for alarms indicating that compressor #1  
is locked out. Press and release the ALARMS button if  
the LED is not flashing an alarm.  
11. If 24 volts is present at the UCB Y1 terminal and the  
compressor is not out due to a protective switch trip,  
repeat trip lock out, or ASCD, the economizer terminals  
of the UCB may be improperly wired. Check for 24 volts  
at the Y1 “OUT” terminal of the UCB. If 24 volts is  
present, trace the wiring from Y1 “OUT” for incorrect wir-  
ing. If 24 volts is not present at the Y1 “OUT” terminal,  
the UCB must be replaced.  
2. Check for line voltage at the compressor contactor, M1,  
and that the contactor is pulled in. Check for loose wiring  
between the contactor and the compressor.  
3. If M1 is pulled in and voltage is supplied at M1, lightly  
touch the compressor housing. If it is hot, the compres-  
sor may be off on inherent protection. Cancel any calls  
for cooling and wait for the internal overload to reset.  
Test again when cool.  
12. For units without economizers: If 24 volts is present at  
the Y1 “OUT” terminal, check for 24 volts at the Y1  
“ECON” terminal. If 24 volts is not present, check for  
loose wiring from the Y1 “OUT” terminal to the Mate-N-  
Lock plug, the jumper in the Mate-N-Lock plug, and in  
the wiring from the Mate-N-Lock plug to the Y1 “ECON”  
terminal.  
4. If M1 is not pulled in, check for 24 volts at the M1 coil. If  
24 volts is present and M1 is not pulled in, replace the  
contactor.  
5. Failing the above, if voltage is supplied at M1, M1 is  
pulled in, and the compressor still does not operate,  
replace the compressor.  
For units with economizers:If 24 volts is present at the  
Y1 “OUT” terminal, check for 24 volts at the Y1 “ECON”  
Unitary Products Group  
43  
terminal. If 24 volts is not present, check for loose wiring  
from the Y1 “OUT” terminal to the Mate-N-Lock plug, a  
poor connection between the UCB and economizer  
Mate-N-Lock plugs, loose wiring from the Mate-N-Lock  
plug to the economizer, back to the Mate-N-Lock plug,  
and from the Mate-N-Lock plug to the Y1 “ECON”  
terminal. The economizer control may have faulted and  
is not returning the 24 volts to the Y1 “ECON” terminal  
even though the economizer is not providing free  
cooling. To test the economizer control, disconnect the  
Mate-N-Locks and jumper between the WHITE and  
YELLOW wires of the UCB’s Mate-N-Lock plug.  
13. The UCB can be programmed to lock out compressor  
operation during free cooling and in low ambient condi-  
tions. These options are not enabled by default. They  
can be checked by local York distributors.  
14. If none of the above corrected the error, test the integrity  
of the UCB. Disconnect the C1 terminal wire and jumper  
it to the Y1 terminal. DO NOT jump the Y1 to C1 termi-  
nals. If the compressor engages, the UCB has faulted.  
15. If none of the above correct the error, replace the UCB.  
Subject to change without notice. Printed in U.S.A.  
035-17311-002-A-0803  
Copyright © by Unitary Products Group 2003. All rights reserved.  
Supersedes: 035-17311-001-A-1202  
Unitary  
Products  
Group  
5005  
York  
Drive  
Norman  
OK  
73069  

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