Armstrong Air NP14A Series User manual

507296G03 / 31-5000670 Page 1 of 20Issue 2211
THIS MANUAL MUST BE LEFT WITH THE
HOMEOWNER FOR FUTURE REFERENCE
The installation of this appliance must conform to the requirements of the National Fire Protection Association; the National
Electrical Code, ANSI/NFPA No. 70 (latest edition) in the United States; the Canadian Electrical Code Part 1, CSA 22.1
(latest edition) in Canada; and any state or provincial laws or local ordinances. Local authorities having jurisdiction should
be consulted before installation is made. Such applicable regulations or requirements take precedence over the general
instructions in this manual.
CAUTION
Save these instructions for future reference
INSTALLATION AND MAINTENANCE
INSTRUCTIONS
NP14A AND NP14H SERIES UNITS
RESIDENTIAL PACKAGED UNITS
Air Conditioners and Heat Pumps
507296G03
03/2022
Table of Contents
Unit Dimensions ..........................................................2
Roof Curb Dimensions ................................................4
Adjustable Roof Curb Dimensions...............................6
Installation ...................................................................9
Electrical Wiring.........................................................11
Duct System ..............................................................12
Filters.........................................................................12
Condensate Drain......................................................13
Sequence of Operation..............................................13
Maintenance..............................................................16
Wiring Diagrams........................................................19
GE Appliances
A Haier Company
Appliance Park
Louisville, KY 40225
(P) 507296G03
*P507296G03*
Installation and servicing of air conditioning equipment
can be hazardous due to internal refrigerant pressure
and live electrical components. Only trained and
qualied service personnel should install or service
this equipment. Installation and service performed by
unqualied persons can result in property damage,
personal injury, or death.
WARNING
Do not store combustible materials, including gasoline
and other ammable vapors and liquids, near the unit,
vent pipe, or warm air ducts. Such actions could cause
property damage, personal injury, or death.
WARNING

Page 2 of 20 507296G03 / 31-5000670Issue 2211
12.12
3.87
3.62
4.06
29.59
34.19
POWER ENTRY
1-1/8 DIA. KNOCKOUT
LOW VOLTAGE ENTRY
7/8 DIA. KNOCKOUT
ELECTRIC HEAT
POWER ENTRY
5.863.07
6.20
17.07
13.44
13.44
14.32
6.20
40.89 21.63
13.21
TYPICAL DRAIN
LOCATION
CONDENSATE
DRAIN 3/4 NPT
SIDE VIEWS
11.49
2.33
47.66
1.98
16.77
2.48
14.02
47.66
POWER ENTRY
POWER ENTRY
6.94
2.33
11.49 16.07
18.52
3.25
4.56
20.31
21.06
23.19
RETURN
AIR
SUPPLY
AIR
TOP VIEW
Unit Dimensions - Small Base Air Conditioners & Heat Pumps

507296G03 / 31-5000670 Page 3 of 20Issue 2211
3.87
3.62
4.06
38.19
12.14
33.59
POWER ENTRY
1-1/8 DIA. KNOCKOUT
LOW VOLTAGE ENTRY
7/8 DIA. KNOCKOUT
ELECTRIC HEAT
POWER ENTRY
14.32
4.20
3.76
6.20
17.07
18.19 18.19
6.20
44.89 21.63
13.21
TYPICAL DRAIN
LOCATION
CONDENSATE
DRAIN 3/4 NPT
SIDE VIEWS
TOP VIEW
POWER ENTRY
POWER ENTRY
RETURN
AIR
2.11
19.49
2.39 2.33
11.49 16.07
18.52
6.94
3.25
10.06
19.49
SUPPLY
AIR
25.81
26.56
28.68
11.49
2.33
47.66
56.13
Unit Dimensions - Large Base Air Conditioners & Heat Pumps

Page 4 of 20 507296G03 / 31-5000670Issue 2211
NOTE - Roof deck may be omitted within confines of curb.
Insulated
Panels
Opening for Power Entry
Through Unit Base
5-1/2 x 5-5/8 in.
(140 x 31 mm)
Opening for Power Entry
Through Unit Base
3 x 13 in.
(76 x 330 mm)
44-3/8
(1127)
44-3/8
(1127)
16-7/8
(429)
13-7/8
(352)
2-1/8
(54)
11-1/2
(287)
SUPPLY
OPENING
RETURN
OPENING
8 (203)
14 (356)
18 (457)
24 (610)
3/4 (19)
1 (25)
5-1/2
(140)
5-3/4
(146)
11-1/2
(287)
17-1/4
(438)
1-3/8
(35)
3-3/4
(95)
13
(330)
3
(76)
Roof Curb Dimensions - Small Base Air Conditioners & Heat Pumps

507296G03 / 31-5000670 Page 5 of 20Issue 2211
NOTE - Roof deck may be omitted within confines of curb.
Insulated
Panels
Opening for Power Entr
y
Through Unit Base
5-1/2 x 5-5/8 in.
(140 x 31 mm)
Opening for Power Entry
Through Unit Base
3 x 13 in.
(76 x 330 mm)
52-7/8
(1343)
44-3/8
(1127)
19-1/2
(380)
11-1/2
(287)
19-1/2
(380)
2-1/8
(54)
11-1/2
(287)
SUPPLY
OPENING
RETURN
OPENING
8 (203)
14 (356)
18 (457)
24 (610)
3-3/4
(95)
22-7/8
(581)
7 (178)
3/4 (19)
1 (25)
Roof Curb Dimensions - Large Base Air Conditioners & Heat Pumps

Page 6 of 20 507296G03 / 31-5000670Issue 2211
Top Edge
Wood Nailer Strip
Bottom Flange
Typical Slot
Typical Locking Ta b
See Cliplock 1000 installation instructions for complete
assembly and installation procedures and requirements.
NOTE:
CLIPLOCK CORNER DETAIL
CURB PROFILE
1
1/2
1-3/4
1
11-5/8
2-1/8
14
1
3-1/2
13-1/2
44-3/8
Bottom Curb
Assembly
Opening for Power
Entry thru base
11-5/8
5-1/2
5-3/4
3-5/8 1-3/8
17-1/4
13-7/8
16-7/8
44-3/8
Insulated Panels
Opening for Power
Line Entry thru base
NOTE - Roof deck may be omitted within confines of curb.
Adjustable Roof Curb Dimensions - Small Base Air Conditioners & Heat Pumps
(Knock-Down Style)

507296G03 / 31-5000670 Page 7 of 20Issue 2211
Top Edge
Wood Nailer Strip
Bottom Flange
Typical Slot
Typical Locking Ta b
See Cliplock 1000 installation instructions for complete
assembly and installation procedures and requirements.
NOTE:
CLIPLOCK CORNER DETAIL
CURB PROFILE
1
1/2
1-3/4 1
19-5/8
11-5/8
2-1/8
19-3/8
11-5/8
14
23-1/8
1
5-1/2
5-3/4
3-1/2
3-1/2
13-1/2
6-7/8
52-7/8
44-3/8
Insulated Panels
Opening for Power
Line Entry thru base
Bottom Cur
b
Assembly
Opening for Power
Entry thru base
NOTE - Roof deck may be omitted within confines of curb.
Adjustable Roof Curb Dimensions - Large Base Air Conditioners & Heat Pumps
(Knock-Down Style)

Page 8 of 20 507296G03 / 31-5000670Issue 2211
Adjustable Roof Curb Dimensions - Air Conditioners & Heat Pumps
(Welded Style)
A
BC
3/4 (76)
6
(152)
1
(25)
11 -1/2
(292)
42-7/8
(1089)
2-1/ 8
(54)
Built-In Rain
Diverter
(Not Shown)
Front Flange
8 (203)
NOTE:
Minimum
Height
4 (102)
Built-In Drip Edge
Unit Base Rail
Unit Base Rail
Clips (4)
Sides and
Back Flange
6 (152)
Unit Base Rail
Clips (4)
Supply
Air
Opening
Return
Air
Opening
Usage A B C
in. mm in. mm in. mm
24,30,36 42-7/8 1089 13-7/8 352 16-7/8 429
42,48,60 51-3/8 1305 19-1/2 495 19-1/2 495

507296G03 / 31-5000670 Page 9 of 20Issue 2211
Improper installation, adjustment, alteration, service,
or maintenance can cause injury or property damage.
Refer to this manual. For assistance or additional
information, consult a qualied installer or service
agency.
WARNING
Installation
These instructions explain the recommended method of
installation of the packaged heat pump and air conditioner
units and associated electrical wiring.
This unit is designed and approved for use as a self-
contained air-to-air outdoor heat pump and air conditioner
system.
The units are factory-equipped with a transformer and
blower control for applications without auxiliary heat.
Electric heat accessory kits (PHK-) can be ordered for eld
installation of additional heat where required.
These instructions, and any instructions packaged with
mating components and/or accessories, should be carefully
read prior to beginning installation. Note particularly any
CAUTIONS or WARNINGS in these instructions and all
labels on the units.
These instructions are intended as a general guide only,
for use by qualied personnel and do not supersede any
national or local codes in any way. Compliance with all local,
state, provincial, or national codes pertaining to this type of
equipment should be determined prior to installation.
Inspection of Shipment
Upon receipt of equipment, carefully inspect it for possible
shipping damage. If damage is found, it should be noted
on the carrier’s freight bill. Take special care to examine
the unit inside the carton if the carton is damaged. File a
claim with the transportation company.
If any damages are discovered and reported to the carrier,
DO NOT INSTALL THE UNIT, as claim may be denied.
Check the unit rating plate to conrm specications
are as ordered.
Limitations
The unit should be installed in accordance with all national
and local safety codes.
Limitations of the unit and appropriate accessories must
also be observed.
The unit must not be installed with any ductwork in the
outdoor air stream. The outdoor fan is not designed to
operate against any additional static pressure.
Location
The unit is designed to be located outdoors with su󰀩cient
clearance for free entrance to the air inlet and discharge
air openings. The location must also allow for adequate
service access.
The unit must be installed on a solid foundation that will
not settle or shift. Adequate structural support must be
provided. Install the unit in level position. Isolate the base
from the building structure to avoid possible transmission
of sound or vibration into the conditioned space.
The heat pump unit foundation should be raised to a
minimum of 3” above nish grade. In areas that have
prolonged periods of temperature below freezing and
snowfall, the heat pump unit should be elevated above the
average snow line. Extra precaution should be taken to
allow free drainage of condensate from defrost cycles to
prevent ice accumulation. The unit should not be located
near walkways to prevent possible icing of surface from
defrost condensate.
Avoid placing the unit near quiet areas, such as
sleeping quarters or study rooms. Normal operating
sound levels may be objectionable if the unit is placed near
certain rooms.
For improved start-up performance, the condenser coil
should be washed with suitable detergent to remove
any residue from manufacturing processes.
Use of Unit During Construction
Use of this unit as a construction heater or air conditioner is
not recommended during any phase of construction. Very
low return air temperatures, harmful vapors and operation
of the unit with clogged or misplaced lters will damage
the unit.
If this unit has been used for heating or cooling of buildings
or structures under construction, the following conditions
must be met or the warranty will be void:
• A room thermostat must control the unit. The use of
xed jumpers that will provide continuous heating or
cooling is not allowed.
• A pre-lter must be installed at the entry to the return
air duct.
• The return air duct must be provided and sealed to
the unit.
• Return air temperature range between 55°F (13°C)
and 80°F (27°C) must be maintained.
• Air lters must be replaced and pre-lters must be
removed upon construction completion.
• The input rate and temperature rise must be set per
the unit rating plate.
• The heat exchanger, components, duct system, air
lters and evaporator coil must be thoroughly cleaned
following nal construction clean-up.

Page 10 of 20 507296G03 / 31-5000670Issue 2211
• The unit operating conditions (including airow,
cooling operation, ignition, input rate, temperature
rise and venting) must be veried according to these
installation instructions.
Clearances
All units require certain clearances for proper operation
and service. Refer to Table 1 for the minimum clearances
to combustibles required for construction, servicing, and
proper unit operation.
In the U.S., units may be installed on combustible oors
made from wood or class A, B, or C roof covering material.
In Canada, units may be installed on combustible oors.
Units must be installed outdoors.
Do not permit overhanging structures or shrubs to
obstruct condenser air discharge outlet.
Clearance to
Combustibles
Clearance for
Service Access
Front of unit 0 in. 24 in.
Back of unit 0 in. 0 in.
Left side 0 in. 24 in.
Right side 0 in. 24 in.
Base of unit 0 in. 0 in.
Top of unit 0 in. 48 in.
For any future service, installer must provide access to
screws of top and rear panels.
Table 1. Minimum Clearances
Compressor
Units are shipped with compressor mountings factory
adjusted and ready for operation. Do not loosen
compressor mounting bolts.
Roof Curb Installation
If a roof curb is used, follow the manufacturer’s installation
instructions and be sure that all required clearances are
observed (see Clearances section).
Prior to setting the unit on the roof curb, the shipping
bracket located underneath the unit must be removed.
Remove the two screws in the base rail (located on the
front and rear sides of the unit). The four screws and the
bracket can be discarded. See Figure 1.
Rigging Unit
Exercise care when moving the unit. Do not remove any
packaging until the unit is near the place of installation.
1. Connect rigging to the unit base rails using both holes
in each corner.
2. All panels must be in place for rigging.
3. Place eld-provided spreaders in place. Spreaders
must be of adequate strength and length (must exceed
unit dimension by 6 inches).
Units may also be moved or lifted with a forklift. The
lengths of the forks of the forklift must be a minimum
of 42 inches.
Shipping Bracket and Mounting Screws Must be
Removed for Rooftop or Downflow Application
Field-Provided Lifting
Spreaders Recommended
Figure 1.

507296G03 / 31-5000670 Page 11 of 20Issue 2211
Electrical Wiring
All eld wiring must be done in accordance with National
Electrical Code recommendations, local codes, and
applicable requirements of UL Standards, or in accordance
with Canadian Electrical Code recommendations, local
codes, or CSA Standards. Power wiring, disconnect
means, and over-current protection are to be supplied by
the installer. Refer to the unit rating plate for maximum
over-current protection and minimum circuit ampacity, as
well as operating voltage. The power supply must be sized
and protected according to specications supplied.
The unit must be grounded with a separate ground
conductor. See Figure 4 for typical eld wiring connection.
The wiring diagram can be found on the unit inside the
access panel. Low voltage control wiring are terminal strip
or pigtail leads located on the main control box and are
color-coded to match the connection called out on the
wiring schematic.
NOTE: An optional bottom-entry power kit is available for
these units. See the kit instructions for proper installation
details.
When connecting electrical power and control wiring
to the unit, waterproof-type connectors must be used
so that water or moisture cannot be drawn into the unit
during normal operation.
CAUTION
Units are factory wired for a 230-volt power supply.
If power supply is 208 volts, it will be necessary to
change a wire connection on the unit transformer from
240V terminal to 208V terminal as shown on the wiring
diagram.
Use only copper conductors.
If any of the original unit wiring is replaced, the same size
and type wire must be used.
If 208 Volt is supplied, transformer connection must be
changed
Single Phase
Power Supply
Ground
Lug
Contactor
Field-Supplied Fused
or Circuit Breaker
Disconnect
Figure 3. 208/230 Line Voltage Wiring
Before lifting a unit, make sure that the weight is
distributed equally on the cables so that it will lift evenly.
CAUTION
Figure 2.
Thermostat
Wire Entry
High Voltage
Power Entry
Gas Entry
Unpacking
Locate the four stacking brackets at each corner of the top
panel. Remove the screws and washers that secure these
brackets. All screws must be re-installed. The washers and
stacking brackets can be discarded. Remove the bag and
remaining packaging material, which can be discarded.
Locate the four plastic fork slot bumpers on the base rails.
Remove the fasteners and bumpers and discard.
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
CAUTION
Service Access
Access to all serviceable components is provided by four
removable panels: upper access panel (for blower, ID coil,
and optional lter), auxiliary heat access, control access
panel, and compressor access.
This unit is charged with HFC-410A refrigerant.
Operating pressures for units charged with HFC-410A
are higher than pressures in units charged with HCFC-
22. All service equipment MUST be rated for use with
HFC-410A refrigerant.
WARNING

Page 12 of 20 507296G03 / 31-5000670Issue 2211
Duct System
The duct system should be designed and sized according
to the methods in the Air Conditioning Contractors of
America (ACCA) manual that is most appropriate to the
installation application.
A closed return duct system shall be used. This shall not
preclude use of economizers or outdoor fresh air intake. It
is recommended that supply and return duct connections
at the unit be made with exible joints.
Thermostat
The room thermostat should be located on an inside
wall where it will not be subject to drafts, sun exposure,
or heat from electrical xtures or appliances. Follow the
manufacturer’s instructions enclosed with the thermostat
for general installation procedure. Color-coded insulated
wires (#18 AWG) should be used to connect the thermostat
to the unit. A minimum of ve wires are required for proper
installation.
Figure 4. Typical Wiring Connections
R
G
W
O
Y1
C
R
G
W
O
Y1
C
THERMOSTAT OUTDOOR UNIT
Red
Blue
Yellow
Orange
White
Green
*
!CAUTION
required by the indoor thermostat. Refer to the
thermostat installation instructions.
Do not connectconnections except when
C
*“O” connection used only on heat pump models
SINGLE PHASE
L2 L1 GROUND
SCREW
POWER WIRING
208/230-1-60
(75° MIN. WIRE)
POWER WIRING
24V CONTROL WIRING
(NEC CLASS 2)
W1, W2 can be used to stage electric heat accessory on 10,
15 & 20 kW models. 5 And 7 kW heater accessory function
o󰀨 W1 only.
The supply and return air duct systems should be designed
for the CFM and static requirements of the job. They
should not be sized to match the dimensions of the
duct connections on the unit.
The unit is shipped ready for horizontal ow (side duct
connections) or downow (bottom duct connections). All
units are equipped with a drain pan overow switch that is
installed and wired at the factory. Duct attachment screws
are intended to go into the duct panel anges. Duct to unit
connections must be sealed and weather proofed.
For horizontal duct systems:
1. Remove the duct covers on side of the unit. They can
be discarded.
2. Install the duct system to the unit.
For downow duct systems:
1. Remove the duct covers on side of the unit. Keep the
screws and the covers as they will be re-installed later.
2. Remove the downow duct covers located inside unit.
Remove the four screws securing each cover. Remove
the covers from the unit. They can be discarded.
3. Remove screws located between the supply and
return air openings that attach the blower deck to the
base pan. These screws can interfere with bottom duct
connections or roof curb seals. Discard these screws.
4. Install the duct system to the unit.
5. Re-install the duct covers removed in Step 1.
Filters
Air lters are not supplied with the unit. A eld-provided air
lter must always be installed ahead of the evaporator coil
and must be kept clean or replaced. Dirty lters will reduce
the airow of the unit.
An optional lter rack kit may be purchased separately
for installation inside the unit’s coil compartment. Air lter
sizes are shown in Table 2 for use with lter rack kit.
The lter rack must be installed prior to installation of
the unit in applications where access to the rear panel
is limited.
NOTE:
Table 2. Unit Air Filter Sizes - inches
Unit Model Filter 1 Filter 2
24,30,36 14 x 20 x 1 20 x 20 x 1
42,48,60 20 x 20 x 1

507296G03 / 31-5000670 Page 13 of 20Issue 2211
Condensate Drain
This package unit is equipped with a 3/4” FPT coupling
for condensate line connection. Plumbing must conform
to local codes. Use a sealing compound on male pipe
threads.
Do not operate unit without a drain trap. The condensate
drain is on the negative pressure side of the blower;
therefore, air being pulled through the condensate line will
prevent positive drainage without a proper trap.
The condensate drain line must be properly trapped,
routed to a suitable drain and primed prior to unit
commissioning.
NOTE: Install drain lines and trap so they do not block
service access to the unit.
See Figure 5 for proper drain arrangement. The drain line
must pitch to an open drain or pump to prevent clogging
of the line. Seal around the drain connection with suitable
material to prevent air leakage into the return air system.
To prime trap, pour several quarts of water into drain,
enough to ll drain trap and line.
Drain lines should be hand-tightened only. Do not use
tools to tighten tting into drain.
CAUTION
Minimum Pitch:
1 in (25) Per 10”
(3048 mm) of
Line
Open
Vent
Unit
Trap must be deep enough to o󰀨set maximum static di󰀨erence
(generally, 3 inches (76 mm) minimum). In addition, the drain line
must be supported if longer than 10 feet.
Trap must be primed at start-up.
Mounting
Frame
Figure 5. Typical Condensate Drain Connection
Sequence of Operation
Cooling
When the thermostat is in the cooling mode, the O circuit
is powered, which energizes the reversing valve. Upon
cooling demand, the thermostat closes circuit R and Y.
Closing R and Y closes the unit contactor, starting the
compressor and outdoor fan. The thermostat automatically
closes the R to G circuit, which brings on the indoor blower
at the same time. Upon satisfying cooling demand, the
thermostat will open the above circuits and open the main
contactor, stopping the compressor and outdoor fan. If the
unit is equipped with a delay timer, the blower will continue
to operate for 60 to 90 seconds, which improves system
e󰀩ciency.
Heating - Heat Pump Stage
Upon heating demand, the thermostat closes circuit R to
Y, which closes the unit contactor, starting the compressor
and outdoor fan. The reversing valve is not energized in
the heating mode. The thermostat again automatically
brings on the indoor fan at the same time. Upon satisfying
heating demand, the thermostat opens above circuits and
stops unit operation.
Heating - Auxiliary Electric Heat
Upon heating demand for auxiliary electric heat, the
thermostat closes circuit R to W, which energizes the
Crankcase Heater (if used)
Some models may be equipped with a crankcase heater
to prevent excessive migration of liquid refrigerant into the
compressor during o󰀨 cycles. Power must be maintained
to the unit to keep this feature active.
Except as required for safety while servicing, do not open
the system disconnect switch.
Heater Kit Accessory (if used)
The unit is fully equipped for cooling operation without
auxiliary heat. A heater kit accessory may also be used. To
install the heater kit accessory (see Figure 7):
1. Disconnect the power and open the main control
access.
2. Disconnect the plug separating the high voltage wire
harness. Remove the high voltage wire harness plug
and discard.
3. Remove the heater blocko󰀨 by removing the four
screws holding it in place.
4. Insert the heater into the control panel and fasten in
the same mounting holes.
5. Plug the heater wiring harness into the wire harness
on the control assembly. Field wiring of the auxiliary
heater is separate from the unit power supply. Wire the
power supply wiring for the heater to the appropriate
connections on the heater kit.

Page 14 of 20 507296G03 / 31-5000670Issue 2211
Figure 7. Heater Kit Accessory Installation






heater sequencers as well as the indoor blower. Upon
satisfying auxiliary heat demand, the thermostat opens
above circuits and heating elements sequence o󰀨; blower
continues to operate until all heating elements have turned
o󰀨.
Defrost System
The defrost system includes two components: the defrost
thermostat and the defrost control.
Defrost Thermostat
The defrost thermostat is located on the evaporator coil.
When the defrost thermostat senses 35°F or cooler, the
thermostat contacts close and send a signal to the defrost
control board to start the defrost timing. It also terminates
defrost when the liquid line warms up to 60°F.
Defrost Control
The defrost control board includes the combined functions
of time/temperature defrost control, defrost relay, diagnostic
LEDs and terminal strip for eld wiring connections (see
Figure 6).
The control provides automatic switching from normal
heating operation to defrost mode and back. During the
compressor cycle (call for defrost), the control accumulates
compressor run time at 30, 60, 90 minute eld-adjustable
intervals. If the defrost thermostat is closed when the
selected compressor run time interval ends, the defrost
relay is energized and the defrost begins.
Figure 6. Defrost Control Board
24V TERMINAL
STRIP
CONNECTIONS
DIAGNOSTIC
LEDS
HIGH PRESSURE
SWITCH
TEST
PINS
DEFROST TIMING
PINS (P1)
REVERSING
VALVE
DEFROST
THERMOSTAT (S6)
LOW PRESSURE
SWITCH
COMPRESSOR
DELAY PINS
S4
S87
SERVICE LIGHT
CONNECTIONS
1. An on-board outdoor ambient temperature sensor on
the defrost control bypasses the low pressure switch
during low ambient temperature below 15°F in heating
mode to eliminate nuisance low pressure trips.
NOTE: 15°F is an approximate temperature,
depending upon model and installation location.
2. A defrost cycle will initiate when there has been a low
pressure switch trip; the defrost sensor must be closed
and the defrost time interval must not have expired.

507296G03 / 31-5000670 Page 15 of 20Issue 2211
3. At the end of the defrost cycle, when the unit goes
back to heating mode, the low pressure switch is
checked to see if it has reset. If so, the strikeout is not
counted. This prevents lockout during extreme winter
conditions.
Defrost Control Timing Pins
Each timing pin selection provides a di󰀨erent accumulated
compressor run time period during one thermostat run
cycle. This time period must occur before a defrost cycle
is initiated. The defrost interval can be adjusted to 30
(T1), 60 (T2), or 90 (T3) minutes. It is intended that this
product should be set at the 60-minute time interval at
initial installation. If the timing selector jumper is not in
place, the control defaults to a 90-minute defrost interval.
The maximum defrost period is 14 minutes and cannot be
adjusted.
For geographic areas that experience low temperature
and high humidity conditions (below 35°F and above
80% RH), the defrost timer pin must be eld set at
installation to a 60 or 30 minute defrost interval to
ensure reliable system operation while in heating mode.
NOTE:
A test option is provided for troubleshooting. The test mode
may be started any time the unit is in the heating mode and
the defrost thermostat is closed or jumpered. If the jumper
is in the TEST position at power up, the control will ignore
the test pins. When the jumper is placed across the TEST
pins for 2 seconds, the control will enter the defrost mode.
If the jumper is removed before an additional 5-second
period has elapsed (7 seconds total), the unit will remain
in defrost mode until the defrost thermostat opens or 14
minutes have passed. If the jumper is not removed until
after the additional 5-second period has elapsed, the
defrost will terminate and the test option will not function
again until the jumper is removed and reapplied.
Compressor Delay (Quiet Shift)
The defrost board has a eld-selectable function to reduce
occasional sounds that may occur while the unit is cycling
in and out of the defrost mode. The compressor will be
cycled o󰀨 for 30 seconds going in and out of the defrost
mode when the compressor delay jumper is removed.
NOTE: The 30-second “o” cycle is not functional when
jumpering the TEST pins.
Time Delay
The defrost control includes a compressor timer, which
ensures the compressor is o󰀨 for a minimum amount of
time between operating cycles.
The timed-o󰀨 delay is 5 minutes long. The delay helps
to protect the compressor from short cycling in case the
power to the unit is interrupted or a pressure switch opens.
The delay is bypassed by placing the timer select jumper
across the TEST pins for 0.5 seconds.
Pressure Switch Circuit
High and low pressure switches are connected to the
defrost control board on heat pump models. Air conditioning
models have a high pressure switch installed in line with
compressor contactor coil (see Figure 6).
During a single demand cycle, the defrost control will
lock out the unit after the fth time that the circuit is
interrupted by any pressure switch wired to the control
board. In addition, the diagnostic LEDs will indicate a
locked-out pressure switch after the fth occurrence
of an open pressure switch (see Table 3).
The unit will remain locked out until power to the board
is interrupted, then re-established, or until the jumper
is applied to the TEST pins for 0.5 seconds.
NOTE: The defrost control board ignores input from the
low pressure switch terminals as follows:
• During the TEST mode
• During the defrost cycle
• During the 90-second start-up period
• For the rst 90 seconds each time the reversing valve
switches heat/cool modes
If the TEST pins are jumpered and the 5-minute delay
is being bypassed, the LO PS terminal signal is not
ignored during the 90-second start-up period.
Diagnostic LEDs
The defrost board uses two LEDs for diagnostics. The
LEDs ash a specic sequence according to the condition
as shown in Table 3.
Defrost Board Diagnostic LEDs
Green LED
(DS2)
Red LED
(DS1) Condition
OFF OFF No Power to Control
Simultaneous slow FLASH Normal Operation /
Power to Control
Alternating Slow FLASH 5-min Anti-Short-Cycle Delay
ON Slow FLASH Low Pressure Switch Ignored
(Low Ambient)
Fault & Lockout Codes
OFF Slow FLASH Low Pressure Switch Fault
OFF ON Low Pressure Switch Lockout
Slow FLASH OFF High Pressure Switch Fault
ON OFF High Pressure Switch Lockout
Table 3. Defrost Control (CMC1) Diagnostic LEDs

Page 16 of 20 507296G03 / 31-5000670Issue 2211
Maintenance
Before performing maintenance operations on the
system, shut o󰀨 all electrical power to the unit. Turn o󰀨
accessory heater power switch if applicable. Electrical
shock could cause personal injury or death.
WARNING
Periodic inspection and maintenance normally consists of
changing or cleaning the lters and cleaning the evaporator
coil. On occasion, other components may also require
cleaning.
Filters
Filters are not supplied with the unit. Inspect once a month.
Replace disposable or clean permanent type as necessary.
Do not replace permanent type with disposable.
Motors
Indoor and outdoor fan and vent motors are permanently
lubricated and require no maintenance.
Indoor fans are equipped with a permanent magnet
constant torque motor. These motors remain energized and
are controlled by 24V signals. For high static applications,
use Tap 3 for cooling speed and Tap 5 for heating speed.
Evaporator Coil
Dirt and debris should not be allowed to accumulate on
the evaporator 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 the coil, be sure
the power to unit is shut o󰀨 prior to cleaning. Care should
be used when cleaning the coil so that the coil ns are
not damaged.
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures or shrubs.
System Performance
This equipment is a self-contained, factory optimized
refrigerant system, and should not require adjustments to
system charge when properly installed. If unit performance
is questioned, perform the following checks.
Ensure unit is installed per manufacturer’s instructions
and that line voltage and air ow is correct. Refer to
the following tables for proper performance value. The
indoor metering device varies by model; when checking
performance of a unit using an orice for metering, refer to
the suction superheat value to judge performance. When
checking performance of a unit that uses an expansion
valve for metering, refer to the subcooling value to judge
system performance.
If the measured performance value varies from table value
allowance, check internal seals, service panels and duct
work for air leaks, as well as restrictions and blower speed
settings. If unit performance remains questionable, remove
system charge, evacuate to 500 microns, and weigh in
refrigerant to nameplate charge. It is critical that the exact
charge is re-installed. Failure to comply will compromise
system performance.
If unit performance is still questionable, check for
refrigerant related problems, such as blocked coil or
circuits, malfunctioning metering device or other system
components.
Model Suction
Superheat +/- 3°
Liquid
Subcooling +/- 2°
2 Ton 13
2.5 Ton 16
3 Ton 14
3.5 Ton 14
4 Ton 16
5 Ton 17
Based on outdoor ambient temperature of 82°F, and indoor
entering air of 80°F db, 67°F wb.
Table 4. Air Conditioner Unit Cooling System
Performance Values
Model Suction
Superheat +/- 3°
Liquid Subcooling
+/- 2°
2 Ton 18
2.5 Ton 16
3 Ton 16
3.5 Ton 22
4 Ton 22
5 Ton 5
Based on outdoor ambient temperature of 82°F, and indoor
entering air of 80°F db, 67°F wb.
Table 5. Heat Pump Cooling System Performance
Values
Model Liquid Subcooling +/- 2°
2 Ton 25
2.5 Ton 15
3 Ton 28
3.5 Ton 20
4 Ton 35
5 Ton 28
Based on outdoor ambient temperature of 47°F, and indoor
entering air of 70°F db.
Table 6. Heat Pump Heating System Performance
Values

507296G03 / 31-5000670 Page 17 of 20Issue 2211
Condenser Coil
Clean condenser coil annually with water and inspect
monthly during the cooling season.
Condenser coil may need to be cleaned at startup in
case oil from the manufacturing process is found on the
condenser coil.
Table 7. Cooling Performance - AC Models
80 DB / 67 WB Deg.
Return Air Air Temperature Entering Evaporator Coil, Degree F
Cooling
Input
(1000 BTU)
Pressure 65° 70° 75° 80° 82° 85° 90° 95° 100° 105° 110° 115°
24
Suction
135 136 137 139 139 141 143 146 148 150 152 154
30 135 137 140 142 143 145 147 150 152 154 155 157
36 135 137 140 142 143 144 147 149 151 152 154 155
42 129 132 135 139 140 141 143 145 146 147 148 149
48 132 136 139 143 144 145 146 147 149 151 152 154
60 130 131 133 134 135 136 139 141 144 146 149 152
24
Liquid
250 266 282 298 304 318 340 363 388 413 438 463
30 247 269 292 314 323 336 358 380 406 432 457 483
36 250 275 301 326 336 351 375 399 423 446 470 493
42 248 271 293 316 325 339 362 385 411 436 462 487
48 265 286 308 329 338 352 376 400 427 455 482 509
60 256 276 296 316 324 340 365 386 415 438 473 503

Page 18 of 20 507296G03 / 31-5000670Issue 2211
Table 8. Heating Performance - HP Models
70 Deg. F Return Air Air Temperature Entering Evaporator Coil, Degree F
Cooling
Input
(1000 BTU)
Pressure 0° 5° 10° 17° 20° 25° 35° 40° 47° 50° 55° 60°
24
Suction
33 41 49 60 65 73 89 97 108 113 121 129
30 31 38 45 55 59 66 81 88 98 102 109 117
36 35 42 49 58 62 69 82 89 98 102 109 115
42 25 33 42 54 59 68 85 94 106 111 120 129
48 32 39 47 57 62 69 84 92 102 107 114 122
60 30 37 44 54 58 65 80 87 97 101 108 116
24
Liquid
249 256 263 272 276 283 296 303 312 316 323 329
30 246 253 260 270 274 281 295 302 312 316 323 330
36 251 258 265 275 279 286 300 307 317 321 328 335
42 297 300 304 309 311 315 322 326 331 333 337 341
48 289 297 306 318 323 332 349 358 370 375 384 393
60 272 281 290 302 307 316 334 343 355 360 369 378
Table 9. Cooling Performance - HP Models
80 DB / 67 WB Deg.
Return Air Air Temperature Entering Evaporator Coil, Degree F
Cooling
Input
(1000 BTU)
Pressure 65° 70° 75° 80° 82° 85° 90° 95° 100° 105° 110° 115°
24
Suction
130 134 138 141 143 145 148 151 152 154 155 156
30 130 133 136 139 140 141 143 145 147 149 151 153
36 136 138 140 142 143 144 145 147 149 151 152 154
42 127 131 134 138 139 141 144 147 147 148 148 148
48 132 135 138 142 143 144 147 149 151 152 154 155
60 133 134 135 136 136 137 138 140 142 146 149 146
24
Liquid
236 255 275 294 302 316 339 362 388 414 440 466
30 254 274 294 314 322 336 360 383 410 437 464 491
36 267 285 303 322 329 343 367 391 417 443 468 494
42 238 259 280 302 310 324 348 371 396 421 445 470
48 248 271 294 317 326 340 363 386 412 438 464 490
60 245 276 296 316 312 340 365 373 415 438 473 479

507296G03 / 31-5000670 Page 19 of 20Issue 2211
Figure 8. Connections Diagram - A/C Constant Torque
208/230-1-60
POWER SUPPLY WITH MIN.
75 C COPPER WIRE
BLK
RED
YEL
RED
T2
L2
C
H
F
WHT
BLK
BRN
PUR
RED
RED
BLK
208V
240V
INDOOR BLOWER MOTOR
REDUCE
TO
6.00
REDUCE TO 10.00
REDUCE
TO
BLU
YEL
CAPACITOR
HML
C
NO NC
C
P-3
BLOWER CONTROL
NC C
BLK
C
G
XFMR-R
R
XFMR-C
W1
C L
R
O
Y1
FAN
O-OUT
LO-PS
DF
HI-PS
COMMON
Y1 OUT
2
2
24 V
YW2
RED
YEL
BLU WHT
GRN
ORN
RED
BLU
BLU
YEL
BLU
2
W1 & W2 CAN BE USED TO STAGE ELECTRIC HEAT ACCESSORY ON 15 & 20KW MODELS
5, 7.5 & 10KW HEATER ACCESSORIES FUNCTION OFF W1 ONLY.
BLK
BLK
DEFROST CONTROL
BLU
WHT
DEFROST CONTROL
P-2 P-4
P-6 P-5
LOW PRESSURE
SWITCH
(IF USED)
G
W1
C R
YEL W/ STRIPE
CONTROL CIRCUIT WIRING TO BE 24 VOLT, N.E.C. CLASS 2
L1
T1
T2
L2
C
H
F
OUTDOOR FAN MOTOR
C12 DUAL CAPACITOR
COMPRESSOR
CS
R
537663-01
GRY
RED
BLK
208V
240V
24V
INDOOR BLOWER MOTOR
NOTE: IF ANY OF THE ORIGINAL WIRE IS REPLACED THE SAME SIZE AND TYPE WIRE MUST BE USED. USE COPPER CONDUCTOR ONLY, MIN 75 C WIRE
LINE VOLTAGE FIELD INSTALLED
WARNING- ELECTRIC SHOCK HAZARD. UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES.
YEL
Y
WHT
GRN
5 & 7.5KW HEATER ACCESSORIES FUNCTION OFF W1 ONLY.
BLK
J2-1
J2-2
BLK
C
1
2
3
4
5J2-6 J2-5
WHT
BLU
RED
YEL
WHT
B1
PUR
B4
BLACK
ORG
L
N
G
B3 S1
TRANSFORMER TI
L
G
N
BLK
K1-1 CONTACTOR
YEL W/ STRIPE
CONTACTOR
K1-2
BLU
BLU
GRN
CONTACTOR KI
YEL
BLK
J2-4
NOTE: TAP1 FOR FAN ONLY TAP 2 FOR COOLING TAP3 FOR HIGH STATIC COOLING TAP4 AND TAP5 FOR ELECTRIC HEAT- REFER TO HEATING LABEL
BLK W/ STRIPE
YEL
THERMAL PROTECTION
SWITCH (IF USED)
208/230V-1-60
BLOWER SPEED CHART
UNIT
FACTORY SHIPPED SETTINGS
COOLING INPUT (BLK)
24
LOW
30
MED
36
HIGH
42
LOW
48
MED
60
HIGH
GW1 C R O
CONTACTOR
THERMOSTAT
HIGH PRESSURE
SWITCH
(IF USED)
L1
T1
CONDENSER FAN MOTOR
COMPRESSOR CONTACTOR
COMPRESSOR CONTACTOR
DUAL CAPACITOR
COMPRESSOR
TRANSFORMER
CS
R
L2
L1
537663-01
CONNECTION DIAGRAM, HEAT PUMP - PACKAGED
24V
NOTE: IF ANY OF THE ORIGINAL WIRE IS REPLACED THE SAME SIZE AND TYPE WIRE MUST BE USED. USE COPPER CONDUCTOR ONLY, MIN 75 C WIRE CONNECTION MUST BE JUMPERED WHEN PRESSURE SWITCH IS NOT USED.
LINE VOLTAGE FIELD INSTALLED
WARNING- ELECTRIC SHOCK HAZARD. UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES.
SEE CHART
FOR WIRING
L M H C
MOTOR
SPEED TAPS
FUSE
BLOWER CONTROL
DIAGNOSTIC CODES FOR DEFROST CONTROL LEDS
Note: Because the Pressure Switches are monitored only when "Y1" (Input) is active, the code for pressure switch open will not be seen when "Y1" is off. Instead, the "Normal Operation" or "Anti Short Cycle" code will be seen. Also, when a pressure switch opens and caused a short cycle lockout, the pressure switch-open code will be seen until it closes, then the short cycle lockout code will flash unless it has already expired.
REV. VALVE
DEFROST T'STAT
P-1
(See instructions or markings on System Diagnostic Module for codes of System Diagnostic Module)
YEL YEL
HIGH PRESSURE
SWITCH
LOW PRESSURE
SWITCH (IF USED)
J1: PLUG THROUGH CONTROL PANEL (12 PIN) J2: PLUG FOR ACCESSORY HEAT (6 PIN)
INDOOR BLOWER MOTOR
B-3
J1-3
J1-1
J1-2
J1-12
S4
S79
S173 J1-11
CONNECTION DIAGRAM
A/C (CONSTANT TORQUE BLOWER)
SINGLE PHASE
THERMOSTAT
W1 & W2 CAN BE USED TO STAGE ELECTRIC HEAT ACCESSORY ON 10, 15 & 20KW MODELS
CRANK
CASE
HEATER
(IF USED)
BLK
BLK
HR1
Description
DS2 (GREEN) DS1 (RED)
No Power to Control OFF OFF
Normal Operation / Power to
Control Simultaneous Slow Flash
Anti-Short Cycle Lockout Alternate Slow Flash
Low Pressure Switch Fault OFF Slow Flash
Low Pressure Switch Lockout OFF ON
High Pressure Switch Fault Slow Flash OFF
High Pressure Switch Lockout ON OFF
Wiring Diagrams

Page 20 of 20 507296G03 / 31-5000670Issue 2211
208/230V-1PH,60HZ
Description
DS1 (GREEN) DS2 (RED)
No Power to Control OFF OFF
Normal Operation / Power to
Control Simultaneous Slow Flash
Anti-Short Cycle Lockout Alternate Slow Flash
Low Pressure Switch Fault OFF Slow Flash
Low Pressure Switch Lockout OFF ON
High Pressure Switch Fault Slow Flash OFF
High Pressure Switch Lockout ON OFF
G
W1
C
R
O
THERMOSTAT
L1
T1
T2
L2
C
H
F
DUAL
CAPACITOR
COMPRESSOR
CS
R
537661-01
CONNECTION DIAGRAM, HEAT PUMP
CONSTANT TORQUE BLOWER, SINGLE PHASE
RED
BLK
208V
240V
24V
INDOOR BLOWER MOTOR
NOTE: IF ANY OF THE ORIGINAL WIRE IS REPLACED THE SAME SIZE AND TYPE WIRE MUST BE USED. USE COPPER CONDUCTOR ONLY, MIN 75 C WIRE
LINE VOLTAGE FIELD INSTALLED
WARNING- ELECTRIC SHOCK HAZARD. UNIT MUST BE GROUNDED IN ACCORDANCE WITH NATIONAL AND LOCAL CODES.
BLU
YEL
NC C
W1
C L
R
O
Y1
FAN
O-OUT
LO-PS
DF
HI-PS
COMMON
Y1 OUT
24 V
Y
RED
YEL
BLU
WHT
GRN
ORG
DIAGNOSTIC CODES FOR DEFROST CONTROL LEDS
Note: Because the Pressure Switches are monitored only when "Y1" (Input) is active, the code for pressure switch open will not be seen when "Y1" is off. Instead, the "Normal Operation" or "Anti Short Cycle" code will be seen. Also, when a pressure switch opens and caused a short cycle lockout, the pressure switch-open code will be seen until it closes, then the short cycle lockout code will flash unless it has already expired.
W1 & W2 CAN BE USED TO STAGE ELECTRIC HEAT ACCESSORY ON 10, 15 & 20KW MODELS
5 & 7.5 KW HEATER ACCESSORIES
FUNCTION OFF W1 ONLY.
BLK
DEFROST CONTROL
WHT
DEFROST
CONTROL
J2-2 J2-4
BLK
C
1
2
3
4
5
WHT
BLU
RED
BLU
WHT
L
N
G
NOTE: TAP1 FOR FAN ONLY TAP 2 FOR COOLING TAP3 FOR HIGH STATIC COOLING TAP4 AND TAP5 FOR ELECTRIC HEAT- REFER TO HEATING LABEL
TRANSFORMER
L
G
N
BLK
CONTACTOR
BLK
YEL W/STRIPE
CONTACTOR
(See instructions or markings on System Diagnostic Module for codes of System Diagnostic Module)
BLK
BLU
WHT
FAN
YEL
YEL W/STRIPE
K1-2
K1-1
J2-1
B1
CMC1
C12
GRY
ORG
BLK
CONDENSER FAN MOTOR
PUR
J1-2
J1-1
J1-3
B4
B3
CONTACTOR
K1
HIGH PRESSURE
SWITCH
THERMAL PROTECTION
SWITCH
(IF USED)
S173
S4
J1-11
J1-12
REV. VALVE
DEFROST T'STAT
LOW PRESSURE
SWITCH
GRY
GRY
BLK
BLK
BRN
BRN
L1
S79
S6
J1-5
J1-6
J1-8
J1-9
J1-7
J1-10
YEL
T1
BLU
YEL
J2-6 J2-5
S1
CONTROL CIRCUIT WIRING TO BE 24 VOLT, NEC CLASS-2
CMC1
J1: PLUG THROUGH CONTROL PANEL (12 PIN)
J2: PLUG FOR ACCESSORY HEAT (6 PIN)
INDOOR BLOWER MOTOR
GRN
FLOAT SWITCH
(IF USED)
YEL
YEL
CRANK
CASE
HEATER
(IF USED)
BLK
BLK
HR1
Figure 9. Connections Diagram - Heat Pump Constant Torque