INSTALLATION INSTRUCTIONS
3-Phase R-410A Split System Heat Pump
Product Family: H4H3
These instructions must be read and understood completely before attempting installation.
Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and
NOTE
Signal Words in Manuals
The signal word WARNING is used throughout this
The signal words DANGER, WARNING,
manual in the following manner:
CAUTION, and NOTE are used to identify levels of
hazard seriousness. The signal word DANGER is
only used on product labels to signify an immediate
hazard. The signal words WARNING, CAUTION,
and NOTE will be used on product labels and
throughout this manual and other manuals that may
apply to the product.
WARNING
!
The signal word CAUTION is used throughout this
manual in the following manner:
!
CAUTION
DANGER - Immediate hazards which will result in
severe personal injury or death.
Signal Words on Product Labeling
WARNING - Hazards or unsafe practices which
could result in severe personal injury or death.
Signal words are used in combination with colors
and/or pictures on product labels.
CAUTION - Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE - Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
TABLE OF CONTENTS
Inspect New Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 3
Unit Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . 5 - 8
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 10
Defrost System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Start-up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . 12 - 13
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Comfort Alertt Diagnostics Codes . . . . . . . . . . 15 - 16
R-410A Quick Reference Guide . . . . . . . . . . . . . . . . . 16
!
WARNING
DEATH, PERSONAL INJURY, AND/OR PROPERTY
DAMAGE HAZARD
Failure to carefully read and follow this warning
could result in equipment malfunction, property
damage, personal injury and/or death.
Installation or repairs made by unqualified per‐
sons could result in equipment malfunction, prop‐
erty damage, personal injury and/or death.
The information contained in this manual is in‐
tended for use by a qualified service technician fa‐
miliar with safety procedures and equipped with
the proper tools and test instruments.
Installation must conform with local building
codes and with the National Electrical Code
NFPA70 current edition or Canadian Electrical
Code Part 1 CSA C.22.1.
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INSTALLATION INSTRUCTIONS
Figure 1
3-phase R-410A Split System Heat Pump
Clearances (various examples)
Wall
Wall
6”
24”
Service
24”
Service
18”
6”
18”
18”
18”
Wall
6”
Wall
6”
24”
Service
18”
18”
24”
Service
6”
4”
wide fence
4”
6”
Post
Wall
24”
Service
24”
Service
24”
Service
18”
18”
18”
18”
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INSTALLATION INSTRUCTIONS
3-phase R-410A Split System Heat Pump
UNIT SUPPORT
NOTE: Unit must be level | 2 degrees (a inch rise or fall
per foot of run) or compressor may not function properly.
Figure 2
Tie Down Knockouts
View From Top
Product Family: H series
A. GROUND LEVEL INSTALLATION
a” dia. Tie Down Knockouts
In Base Pan (2 places)
The unit must be level and supported above grade by
beams, platform, or a pad. Platform or pad can be of open or
solid construction but should be of permanent materials
such as concrete, bricks, blocks, steel, or pressure- treated
timbers approved for ground contact. Soil conditions must
be considered so that the platform or pad does not shift or
settle and leave the unit partially supported. Minimum pad
dimensions are shown in Figure 2.
Base
Pan
Depth
If beams or an open platform are used for support, it is
recommended that the soil be treated or area be graveled
to reduce the growth of grasses and weeds.
C
To minimize vibration or noise transmission, it is
recommended that supports not be in contact with the
building structure. However, slabs on grade constructions
with an extended pad are normally acceptable.
B
!
CAUTION
PROPERTY DAMAGE HAZARD
A
Base Pan Width
Failure to follow this caution may result in proper‐
ty damage.
Base Pan
(Bumpout)
Width x Depth
(inches)
Tie Down
Knockouts
Minimum
Mounting Pad
Dimensions
Top surface of platform must be above estimated
snowfall level to prevent snow blocking coil and to
allow water melt to drain from unit.
A
B
C
@
%
n
~
@
^
c
(
z
z
z
$
v
@
!
4
@
^
~
@
^
2
#
!
8
~
#
@
v
(
(
^
^
2
2
@
$
s
#
!
2
~
#
@
2
B. ROOF TOP INSTALLATION
#
$
,
~
#
^
2
@
*
v
#
%
~
#
^
2
This type of installation is not recommended on wood
frame structures where low noise levels are required.
Supporting structure or platform for the unit must be level.
If installation is on a flat roof, locate unit minimum 6 inches
above roof level.
Place the unit over one or more load bearing walls. If there
are several units, mount them on platforms that are
self-supporting and span several load bearing walls. These
suggestions are to minimize noise and vibration
transmission through the structure. If the structure is a home
or apartment, avoid locating the unit over bedrooms or study.
NOTE: When unit is to be installed on a bonded
guaranteed roof, a release must be obtained from the
building owner to free the installer from all liabilities.
C. FASTENING UNIT DOWN
If conditions or local codes require the unit be attached in
place, remove the knockouts in the base pan and install
tie down bolts through the holes (refer to Figure 2).
Contact local distributor for hurricane hold-down details and the
P.E. (Professional Engineer) certification, when required.
!
CAUTION
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Inadequate unit support may cause excessive vibra‐
tion, noise, and/or stress on the refrigerant lines,
leading to refrigerant line failure.
4
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INSTALLATION INSTRUCTIONS
3-phase R-410A Split System Heat Pump
REFRIGERATION SYSTEM
A. COMPONENT MATCHES
B. REFRIGERANT LINE SETS
Check to see that the proper system components are in
place, especially the indoor coil.
The refrigerant line set must be properly sized to assure
maximum efficiency and proper oil circulation.
R-410A outdoor units can only be used with R-410A
specific indoor coils. If there is a refrigerant mis-match,
consult the indoor coil manufacturer to determine if a
refrigerant conversion kit is available for the indoor coil.
Refer to Product Specifications and Long Line
Applications Guideline for line set sizing.
NOTE: If the line set actual length is to exceed 80 feet, or
if there is more than 20 feet vertical separation between
outdoor and indoor units, refer to the Long Line
Application Guideline document for additional
instructions.
This outdoor unit is designed for use only with indoor coils
that utilize a TXV refrigerant metering device. If any other
type of metering device is installed on the indoor coil,
consult the indoor coil manufacturer to determine if a TXV
conversion kit is available.
NOTE: Line set actual length must not exceed 200 feet.
NOTE: A crankcase heater must be used when the
refrigerant line length exceeds 80 feet.
When installing a TXV on an indoor coil, follow the
instructions provided with the new TXV.
If it is necessary to add refrigerant line in the field, use
dehydrated or dry, sealed, deoxidized, copper
refrigeration tubing. Do not use copper water pipe.
A typical TXV installation is shown in Figure 3.
Do not remove rubber plugs or caps from copper tubing
until connections are ready to be made.
!
CAUTION
Be extra careful when bending refrigeration tubing.
Tubing can “kink” easily, and if this occurs, the entire
length of tubing must be replaced.
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.
Indoor coil and outdoor unit must be listed as a
certified combination (match) in the ARI Unitary
Directory of Certified Products.
!
WARNING
PERSONAL INJURY HAZARD
Indoor coil must have R-410A specific, TXV refrig‐
erant metering device.
Failure to follow this warning could result in per‐
sonal injury and/or death.
Figure 3
Typical TXV Installation
Relieve pressure and recover all refrigerant before
servicing existing equipment, and before final unit
disposal. Use all service ports and open all flow-
control devices, including solenoid valves.
INDOOR
COIL
EQUALIZER
TUBE
!
CAUTION
UNIT OPERATION HAZARD
SUCTION
TUBE
SENSING
BULB
Failure to follow this caution may result in improp‐
er product operation.
Do not leave system open to atmosphere any lon‐
ger than absolutely required for installation. Inter‐
nal system components - especially refrigerant
oils - are extremely susceptible to moisture con‐
tamination. Keep ends of tubing sealed during
installation until the last possible moment.
LIQUID
TUBE
TXV
C. ROUTING AND SUSPENDING REFRIGERANT
LINES
SENSING BULB
(EITHER SIDE)
Run refrigerant lines as straight and direct as possible,
avoiding unnecessary bends and turns. Always insulate
the entire suction line. Both lines should be insulated
when routed through an attic or when routed through an
underground raceway.
STRAP
SUCTION
TUBE
When routing refrigerant lines through a foundation or
wall, do not allow refrigerant lines to come in direct
contact with the building structure. Make openings large
enough so that lines can be wrapped with extra insulation.
Fill all gaps with RTV caulk. This will prevent noise
8 O'CLOCK
4 O'CLOCK
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INSTALLATION INSTRUCTIONS
3-phase R-410A Split System Heat Pump
transmission between the tubing and the foundation or
wall.
pipes, or ductwork. Use insulated or suspension type
hangers. Metal straps must be at least 1” wide to avoid
cutting into the tube insulation. Keep the liquid and
suction lines separate. Refer to Figure 4.
Along floor or ceiling joists, suspend refrigerant lines so
that they do not contact the building structure, water
Figure 4
Routing and Suspending Refrigerant Lines
JOIST
OUTDOOR WALL
CAULK
INDOOR WALL
HANGER STRAP
(AROUND SUCTION
INSULATION
TUBE ONLY)
LIQUID TUBE
SUCTION TUBE
SUCTION TUBE
INSULATION
1” MIN
LIQUID TUBE
THROUGH THE WALL
SUSPENSION
Liquid Line Filter-Drier
Figure 5
!
CAUTION
Installed at Indoor Coil
UNIT OPERATION HAZARD
Failure to follow this caution may result in improp‐
er product operation.
Do not bury more than 36” of line set underground.
Refrigerant may migrate to cooler buried section
during extended periods of unit shut-down, caus‐
ing refrigerant slugging and possible compressor
damage at start-up.
If ANY section of the line set is buried under‐
ground, provide a minimum 6” vertical rise at the
service valve.
D. OUTDOOR UNIT HIGHER THAN INDOOR UNIT
Proper oil return to the compressor should be maintained
with suction gas velocity. If velocities drop below 1500
fpm (feet per minute), oil return will be decreased. To
maintain suction gas velocity, do not upsize vertical
suction risers.
NOTE: If there is more than 20 feet vertical separation
between outdoor and indoor units, refer to the Long Line
Application Guidline document for additional instructions.
E. LIQUID LINE FILTER-DRIER
Outdoor units are shipped with an appropriate filter-drier
for installation in the liquid line. Leave the plugs in the tube
ends until the filter-drier is installed. The optimal location
for the filter-drier is close to the indoor coil. Heat pump
filter-driers are “bi-flow” type. Either end can be pointed
towards indoor coil. Refer to Figure 5.
Filter-Drier
38-11-84
6
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INSTALLATION INSTRUCTIONS
F. SERVICE VALVES
3-phase R-410A Split System Heat Pump
Clean line set tube ends with emery cloth or steel brush.
Remove any grit or debris.
Service valves are closed and plugged from the factory.
Outdoor units are shipped with a refrigerant charge
sealed in the unit. Leave the service valves closed until all
other refrigerant system work is complete or the charge
will be lost. Leave the plugs in place until line set tubing is
ready to be inserted.
Insert line set tube ends into service valve tube stubs.
Apply heat absorbing paste or heat sink product between
service valve and joint. Wrap service valves with a heat
sinking material such as a wet cloth.
Braze joints using a Sil-Fos or Phos-copper alloy.
Heat pumps require a piston metering device in the liquid
service valve for proper heating operation. Piston is
shipped in the piston body of the liquid service valve,
temporarily held in place with a plastic cap. Do not remove
the plastic cap until line set tubing is ready to be installed.
!
CAUTION
PRODUCT DAMAGE HAZARD
Refer to Figure 6 and follow these steps for piston
installation:
Failure to follow this caution may result in product
damage.
1. Remove plastic cap holding piston in piston body of
liquid service valve.
Braze with Sil-Fos or Phos-copper alloy on cop‐
per-to-copper joints and wrap a wet cloth around
rear of fitting to prevent damage to TXV.
2. Check that piston size (stamped on side of piston)
matches with number listed on unit rating plate.
Return piston to piston body of liquid service valve
(either direction).
H. EVACUATING LINE SET AND INDOOR COIL
The unit is shipped with a factory refrigerant charge. The
liquid line and suction line service valves have been
closed after final testing at the factory. Do not disturb
these valves until the line set and indoor coil have been
evacuated and leak checked, or the charge in the unit
may be lost.
3. Find plastic bag taped to unit containing copper
adapter tube, brass nut, and plastic washer.
4. Install plastic washer in the seat inside piston body.
5. Fit brass nut onto adapter tube and install tube
onto liquid service valve. Tighten nut finger tight,
then wrench additional ½ turn only. Over tightening
may damage the plastic washer.
NOTE: Do not use any portion of the factory charge for
purging or leak testing. The factory charge is for filling the
system only after a complete evacuation and leak check
has been performed.
Service valve bodies are brass and suction tube stub is
copper.
Liquid Service Valve with Piston
and Adapter Tube
!
Figure 6
CAUTION
PRODUCT DAMAGE HAZARD
BRASS NUT
Failure to follow this caution may result in product
damage.
ADAPTER TUBE
PLASTIC WASHER
Never use the outdoor unit compressor as a vacu‐
um pump. Doing so may damage the compressor.
Line set and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. If
deep vacuum equipment is not available, the alternate
triple evacuation method may be used by following the
specified procedure.
PISTON
PISTON BODY
LIQUID SERVICE VALVE
If vacuum must be interrupted during the evacuation
procedure, always break vacuum with dry nitrogen.
G. BRAZING CONNECTIONS
Deep Vacuum Method
The deep vacuum method requires a vacuum pump
capable of pulling a vacuum to 500 microns and a vacuum
gauge capable of accurately measuring this vacuum
level. The deep vacuum method is the most positive way
of assuring a system is free of air and water.
!
WARNING
FIRE HAZARD
Failure to follow this warning could result in per‐
sonal injury, death, and/or property damage.
Watch the vacuum gauge as the system is pulling down.
The response of the gauge is an indicator of the condition
of the system (refer to Figure 7).
Refrigerant and oil mixture could ignite and burn
as it escapes and contacts brazing torch. Make
sure the refrigerant charge is properly removed
from both the high and low sides of the system be‐
fore brazing any component or lines.
With no leaks in the system, allow the vacuum pump to
run for 30 minutes minimum at the deep vacuum level.
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INSTALLATION INSTRUCTIONS
3-phase R-410A Split System Heat Pump
Deep Vacuum Gauge Response
and System Conditions
Figure 8
Triple Evacuation Sequence
EVACUATE
Figure 7
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
BREAK VACUUM WITH DRY NITROGEN
LEAK IN
SYSTEM
WAIT
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
0
1
2
3
MINUTES
4
5
6
7
EVACUATE
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
Triple Evacuation Method
The triple evacuation method should only be used when
system does not contain any water in liquid form and
vacuum pump is only capable of pulling down to 28 inches
of mercury. Refer to Figure 8 and proceed is as follows:
CHARGE SYSTEM
I. OPENING SERVICE VALVES
1. Pull system down to 28 inches of mercury and
allow pump to continue operating for an additional
15 minutes.
Outdoor units are shipped with a refrigerant charge
sealed in the unit. Opening the service valves releases
this charge into the system.
2. Close manifold valves or valve at vacuum pump
and shut off vacuum pump.
NOTE: Open the Suction service valve first. If the Liquid
service valve is opened first, oil from the compressor may
be drawn into the indoor coil TXV, restricting refrigerant
flow and affecting operation of the system.
3. Connect a nitrogen cylinder and regulator to
system and fill with nitrogen until system pressure
is 2 psig.
Remove Suction service valve cap and insert a hex
wrench into the valve stem. Hold the valve body steady
with an end-wrench and back out the stem by turning the
hex wrench counterclockwise. Turn the stem until it just
contacts the rolled lip of the valve body.
4. Close nitrogen valve and allow system to stand for
1 hour. During this time, dry nitrogen will diffuse
throughout the system absorbing moisture.
5. Repeat this procedure as indicated in Figure 8.
6. After the final evacuate sequence, confirm there
are no leaks in the system. If a leak is found, repeat
the entire process after repair is made.
After the refrigerant charge has bled into the system,
open the Liquid service valve.
NOTE: These are not back-seating valves. It is not
necessary to force the stem tightly against the rolled lip.
The service valve cap is a primary seal for the valve and
must be properly tightened to prevent leaks. Make sure
cap is clean and apply refrigerant oil to threads and
sealing surface on inside of cap.
Tighten cap finger tight and then tighten additional 6 of a
turn (1 wrench flat) to properly seat the sealing surfaces.
J. GAUGE PORTS
Check for leaks at the schrader ports and tighten valve
cores if necessary. Install plastic caps finger tight.
8
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INSTALLATION INSTRUCTIONS
3-phase R-410A Split System Heat Pump
ELECTRICAL WIRING
Phase Monitor Relay Board
!
WARNING
The Phase Monitor Board detects the sequence of the
three phase electrical system, and a relay breaks the Y
(call for cooling) control signal if the phasing is incorrect.
Additionally, the board will detect the loss of voltage on
any of the three phase inputs and break the Y signal in the
same way.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in per‐
sonal injury or death.
Before installing, modifying or servicing system,
turn OFF the main (remote) electrical disconnect
device. There may be more than one disconnect
device.
An LED on the board displays the following status:
Normal function, relay contact
closed.
Red LED ON -
Red LED Blinking - Abnormal function, relay contact
open.
Refer to unit rating plate for the required supply voltage.
Depending on the model, required supply voltage will be:
Red LED OFF -
No 24 VAC control power present at
board.
208/230 V, 3-phase, 60 Hz.
or
NOTE: Units with Comfort Alertt Diagnostics device
have phase monitor feature built in.
460 V, 3-phase, 60 Hz.
Outdoor units are approved for use with copper
conductors only. Do not use aluminum wire.
Figure 10
Phase Monitor Relay Board
Refer to unit rating plate for minimum circuit ampacity and
circuit protection requirements.
Grounding
Permanently ground unit in accordance with the National
Electrical Code and local codes or ordinances. Use a
copper conductor of the correct size from the grounding
lug in control box to a grounded connection in the service
panel or a properly driven and electrically grounded
ground rod.
Supply Voltage Wiring Connections
Make all outdoor electrical supply (Line Voltage)
connections with raintight conduit and fittings. Most
codes require a disconnect switch outdoors within sight of
the unit. Consult local codes for special requirements.
Route electrical supply (Line Voltage) wiring through
knockout hole in bottom of Control Box.
Thermostat Wiring Connections
Connect two power wires to Contactor and one power
wire to Blue lead wire (use wire nut). Connect ground wire
to Ground Lug. Refer to Wiring Diagram on unit and
Figure 9.
Route thermostat wiring through rubber grommet in
bottom of Control Box. Low voltage lead wires are
provided in the control box for connection to thermostat
wires (use wire nuts). Refer to Wiring Diagram on unit and
Figure 11 for low voltage wiring examples.
208/230 V and 460 V
Electrical Supply
(Line Voltage) Connections
Figure 9
NOTE: Use No. 18 AWG (American Wire Gage)
color-coded, insulated (35 °C minimum) wire. If
thermostat is located more than 100 feet (30.5 m) from
unit as measured along the control voltage wires, use No.
16 AWG color-coded wires to avoid excessive voltage
drop.
DISCONNECT
PER NEC AND/OR
LOCAL CODES
CONTACTOR
11
L1
FIELD POWER
WIRING
L3
13
L2
BLUE LEAD WIRE
FIELD GROUND
WIRING
GROUND
LUG
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INSTALLATION INSTRUCTIONS
Figure 11
3-phase R-410A Split System Heat Pump
Typical Thermostat (Control Circuit) Connections
NOTE: WHEN USING OUTDOOR THERMOSTATS, W MUST BE ENERGIZED WHEN REQUESTING SUPPLEMENTAL HEAT.
2
SYSTEMS WITH ONE OUTDOOR THERMOSTAT
SYSTEMS WITH TWO OUTDOOR THERMOSTATS
OUTDOOR
SPLICE
CONNECTION
INDOOR
SPLICE
CONNECTION
THERMOSTAT
SUBBASE
DEFROST
BOARD
THERMOSTAT
SUBBASE
INDOOR
SPLICE
CONNECTION
OUTDOOR
SPLICE
CONNECTION
DEFROST
BOARD
W
3
W
3
ODT
SHR
C
C
C
C
C
C
W
2
W E
2
W
2
W
2
W
2
W
2
ODT
L
G
Y
L
G
Y
G
G
SHR
Y
Y
ODT
E
R
E
O
R
EHR
E
O
R
O
R
O
R
R
REMOVE WIRES FROM CRIMP NUT IN INDOOR FAN COIL WHEN INSTALLING OUTDOOR THERMOSTATS.
SYSTEMS WITHOUT OUTDOOR THERMOSTATS
INDOOR
SPLICE
OUTDOOR
SPLICE
CONNECTION
THERMOSTAT
SUBBASE
DEFROST
BOARD
CONNECTION
LEGEND
C
C
24ꢀ-V FACTORY WIRING
C
24ꢀ-V FIELD WIRING
W2
W2
W2
FIELD SPLICE CONNECTION
OUTDOOR THERMOSTAT
EMERGENCY HEAT RELAY
SUPPLEMENTAL HEAT RELAY
L
G
G
Y
EHR
SHR
Y
E
O
R
O
R
R
10
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INSTALLATION INSTRUCTIONS
3-phase R-410A Split System Heat Pump
DEFROST SYSTEM
A. DEFROST THERMOSTAT
7. Unit will remain in defrost for remainder of
defrost-cycle time or until defrost thermostat
reopens at approximately 65 °F coil temperature of
liquid line.
The defrost thermostat is factory installed on a short tube
stub extending from the coil end plate. Refer to Figure 12
and confirm that the thermostat is securely fastened in
place on the tube stub.
8. Turn off power to outdoor unit and reconnect
fan-motor lead to OF2 on control board (refer to
Figure 13).
Figure 12
Defrost Thermostat
Figure 13
Defrost Control Board
FEEDER TUBE
TUBE STUB
H9C1
®
O1
C
US
OF1
K1
COIL
OF2
DEFROST
THERMOSTAT
C19
C9
C1
1
U1
B. DEFROST CONTROL BOARD
C17
The defrost board is a time/temperature control which
includes a field-selectable time period between defrost
cycles of 30, 60, or 90 minutes (quick-connects located
at board edge, factory set at 90 minutes).
1
Defrost mode is identical to cooling mode except that
outdoor-fan motor stops and second-stage heat is
turned on to continue warming conditioned space.
R20
Initially, the defrost cycle timer starts when the contactor
is energized and a 24 VAC signal is present on the T1
terminal. Then the defrost cycle begins when the defrost
thermostat is closed and the cycle timer times out (30, 60,
90 or minutes).
P3
1
1
J2
DFT
Y
P2
W1
30 60 90
T1 C C O
J1
P1
1
1
SPEEDUP
To initiate a forced defrost cycle, the defrost thermostat
must be closed. This can be accomplished as follows:
O
R
1. Turn off power to outdoor unit.
W
2
2. Disconnect outdoor fan-motor lead from OF2 on
control board (refer to Figure 13). Tape lead to
prevent grounding.
Y
C
3. Restart unit in heating mode, allowing frost to
accumulate on outdoor coil.
4. After a few minutes in heating mode, liquid line
temperature should drop below closing point of
defrost thermostat (approximately 32 °F).
5. Short between speed-up terminals with a
flat-bladed screwdriver (refer to Figure 13). This
reduces the timing sequence to 7, 14, or 21
seconds (30, 60, or 90 minute defrost selection,
respectively).
6. When you hear reversing valve change position,
remove screwdriver immediately; otherwise,
control will terminate normal 10-minute defrost
cycle in approximately 2 seconds.
NOTE: Length of defrost cycle is dependent upon length
of time it takes to remove screwdriver from test pins after
reversing valve has shifted.
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INSTALLATION INSTRUCTIONS
3-phase R-410A Split System Heat Pump
START-UP PROCEDURE
1. Set indoor thermostat selector switch to OFF.
2. Turn ON all electrical disconnect devices.
5. Set indoor thermostat selector switch to COOL or
HEAT. Operate unit for minimum 15 minutes, then
check the system refrigerant charge.
3. If unit has a crankcase heater, energize the heater
and wait 24 hours before proceeding.
Check For Proper Phasing
Observe the LED on the Phase Monitor Relay Board. If
the LED is blinking, turn off power to the unit and swap any
two of the supply voltage wires. Turn power back on and
repeat the start-up procedure.
4. Set indoor thermostat at desired temperature. Be
sure setpoint is below indoor ambient temperature
to call for cooling, or above indoor ambient to call
for heating.
REFRIGERANT CHARGE
A. COOLING MODE
4. Refer to unit rating plate for required subcooling
temperature.
Outdoor units are shipped with a refrigerant charge to
match a specific indoor coil and 15 feet of refrigerant line.
If shorter or longer refrigerant lines or a different indoor
coil are used, the charge will have to be adjusted.
5. Refer to Figure 14. Find the required liquid line
temperature where the rating plate subcooling
temperature intersects measured liquid service
valve pressure.
For different line lengths, add or remove charge based on
0.6 ounces charge per foot of difference. For example, a
25 foot line set is 10 feet longer than the specified 15 feet.
Add 0.6 ounces charge for each of the extra 10 feet:
6. If the measured liquid line temperature is higher
than the chart number, add refrigerant to lower the
measured temperature.
NOTE: When adding refrigerant, charge in liquid
form, using a flow restricting device, into the
suction port.
If the measured liquid line temperature is lower
than the chart number, reclaim refrigerant to raise
the measured temperature.
10 x 0.6 = 6.0 ounces additional charge
This outdoor unit is designed for use only with indoor coils
that utilize a TXV refrigerant metering device. With an
indoor TXV, use the subcooling method to make final
charge adjustments:
Tolerance is | 3 °F.
NOTE: Only use subcooling charging method when
S outdoor ambient temperature is between 70_F and 100_F
S indoor temperature is between 70_ and 80_F
S line set is less that 80 feet.
B. HEATING MODE
To check system operation during heating cycle, refer to
the Tech Label on outdoor unit. This chart indicates
whether a correct relationship exists between system
operating pressure and air temperature entering indoor
and outdoor units. If pressure and temperature do not
match on chart, system refrigerant charge may not be
correct. Do not use chart to adjust refrigerant charge.
1. Operate unit a minimum of 15 minutes before
checking charge.
NOTE: If outdoor unit has a 2-speed fan motor,
motor will operate in low speed when outdoor
ambient temperature is below 82 °F. Pull one of the
yellow low voltage wires off the fan control and the
unit will default to high speed fan for servicing.
Reconnect wire after servicing.
NOTE: When charging is necessary during heating
season, charge must be weighed in accordance with unit
rating plate 0.6 ounces per foot of a inch liquid line
above or below 15 feet respectively.
2. Measure liquid service valve pressure by attaching
an accurate gauge to service port.
3. Measure liquid line temperature by attaching an
accurate thermistor type sensor or electronic
thermometer to liquid line near outdoor coil.
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INSTALLATION INSTRUCTIONS
Figure 14
3-phase R-410A Split System Heat Pump
R-410A Required Liquid Line Temperature (°F) - Cooling Mode
Rating Plate (required)
Subcooling Temperature (°F)
Rating Plate (required)
Subcooling Temperature (°F)
Measured Liquid
Pressure (psig)
Measured Liquid
Pressure (psig)
6
8
10
74
76
78
80
82
84
86
88
90
92
94
96
12
72
74
76
78
80
82
84
86
88
90
92
94
14
70
72
74
76
78
80
82
84
86
88
90
92
16
68
70
72
74
76
78
80
82
84
86
88
90
6
8
10
12
104 102 100 98
14
96
16
94
96
251
259
266
274
283
291
299
308
317
326
335
345
78
80
82
84
86
88
90
92
94
96
98
76
78
80
82
84
86
88
90
92
94
96
364
374
384
395
406
416
427
439
450
462
474
106 104 102 100 98
108 106 104 102 100 98
110 108 106 104 102 100
112 110 108 106 104 102
114 112 110 108 106 104
116 114 112 110 108 106
118 116 114 112 110 108
120 118 116 114 112 110
122 120 118 116 114 112
124 122 120 118 116 114
100 98
SEQUENCE OF OPERATION
A. COOLING MODE
B. HEATING MODE
On a call for cooling, the thermostat makes circuits R-O,
R-Y, and R-G. Circuit R-O energizes reversing valve,
switching it to cooling position. Circuit R-Y energizes
contactor, starting outdoor fan motor and compressor.
Circuit R-G energizes indoor unit blower relay, starting
indoor blower motor.
On a call for heating, the thermostat makes circuits R-Y
and R-G (circuit R-O is NOT made, and the reversing
valve stays in the de-energized, heating position). Circuit
R-Y energizes contactor, starting outdoor fan motor and
compressor. Circuit R-G energizes indoor blower relay,
starting blower motor. If the room temperature continues
to fall, circuit R-W2 is made through the second-stage
room thermostat bulb. Circuit R-W2 energizes a
sequencer, bringing on the first bank supplemental
electric heat and providing electrical potential to the
second heater sequencer (if used). If outdoor
temperature falls below the setting of the outdoor
thermostat (field-installed option), contacts close to
complete the circuit and bring on the second bank of
supplemental electric heat.
When thermostat is satisfied, its contacts open,
de-energizing contactor and blower relay. Compressor
and motors stop.
NOTE: If indoor unit is equipped with a time-delay relay
circuit, the blower runs an additional length of time to
increase system efficiency. (Applies to both cooling and
heating modes.)
NOTE: Low ambient cooling feature allows unit to
operate safely in cooling mode down to 0_ F outdoor
ambient.
When the thermostat is satisfied, its contacts open,
de-energizing contactor, blower relay, and sequencer.
Compressor, motors, and heaters stop.
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INSTALLATION INSTRUCTIONS
3-phase R-410A Split System Heat Pump
TROUBLESHOOTING
Some models are factory equipped with the Comfort
Alertt Diagnostics device in the control box (refer to
Figure 15). Comfort Alert provides around-the-clock
monitoring for common electrical problems, compressor
defects, and broad system faults. If trouble is detected, an
alert code is displayed with a flashing LED indicator.
Comfort Alertt Diagnostics
Figure 15
(some models)
NOTE: Comfort Alert is required for unit operation.
Comfort Alert provides active safety protection and
compressor may be shut down. Alert codes are listed in
Figures 16 and 17.
POWER LED
Y2
Second Stage
Compressor Signal
Y
Comfort Alert is factory wired and requires no
modification. Low voltage lead wires are provided in the
control box for connection to thermostat wires (use wire
nuts).
First Stage
Compressor Signal
DATA
PORT
L
24 VAC for Thermostat
Indicator
R
24 Volt Power
The Comfort Alert device operates by monitoring the
compressor power leads and the thermostat demand
signal (Y terminal). It draws constant 24 VAC power at the
R and C terminals.
C
P
24 Volt Common
24 Volt Compressor
Protection Function
DC Compressor
Solenoid
DC
SOL
ALERT LED
TRIP LED
Compressor Wires
Pass Through Holes (3)
MAINTENANCE
Condensate Drain
2. Keep the coil free of grass clippings, leaves,
weeds, and other debris.
During the cooling season, check monthly for free flow of
drainage and clean if necessary.
NOTE: Coil may occasionally require cleaning with
a liquid solution. The coil must be cold when
cleaning. Use an alkaline based cleaner only.
Cleaning a hot coil or using an acid based cleaner
will remove the paint from the fins and may clog the
coil.
Cleanliness
These tips will help keep the air conditioner looking better
and working more efficiently:
1. Free flow of air is essential. Keep fences, shrubs,
trash cans, and other obstructions at least 18
inches from all coil inlets.
3. Never use a weather cover over the outdoor unit
unless it is a ventilated type or made of breathable
fabric that will allow moisture to evaporate rapidly.
A cover that holds moisture in the unit will cause
more rust build-up and damage than normal
exposure to weather.
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INSTALLATION INSTRUCTIONS
Figure 16
3-phase R-410A Split System Heat Pump
Comfort Alertt Diagnostics (some models)
Status LED Status LED Description
Green “POWER” Module has power
Status LED Troubleshooting Information
Supply voltage is present at module terminals
Red “TRIP” LED Thermostat demand signal 1. Compressor protector is open
On Solid
Y1 is present, but the
compressor is not running
2. Outdoor unit power disconnect is open
3. Compressor circuit breaker or fuse(s) is open
4. Broken wire or connector is not making contact
5. Compressor power wires not routed through Comfort Alert
6. Compressor contactor has failed open
Red “TRIP”
LED Flashing
The anti-short cycle timer (3 minutes), in module is preventing compressor restart.
Module locks out compressor when compressor damaging ALERT codes appear. Lockout ALERT codes are
noted in the Status LED Description; during a compressor lockout, 24VAC power must be removed from module
to manually reset.
Yellow “ALERT” A short circuit or over
LED On Solid current condition exists on
PROT terminal
1. Compressor contact coil shorted
2. Electrical load too high for PROT circuit (maximum) 1 amp
3. 24 VAC wired directly to PROT terminal
1. High head pressure
Yellow “ALERT” System Pressure Trip
Flash Code 2
Discharge or suction
2. Condenser coil poor air circulation (dirty, blocked, damaged)
3. Condenser fan is not running
pressure out of limits or
compressor overloaded (if
no high pressure switch in
system) LOCKOUT
4. If low pressure switch present in system, check Flash Code 3
information
Yellow “ALERT” Short Cycling
Flash Code 3 Compressor is running only
briefly LOCKOUT
1. If low pressure switch is open:
a. Low refrigerant charge
b. Evaporator bower is not running
c. Evaporator coil is frozen
d. Faulty metering device
e. Condenser coil is dirty
f. Liquid line restriction
2. If high pressure switch present go to Flash Code 2 information
3. Intermittent thermostat demand signal
4. System or control board defective
Yellow “ALERT” Locked Rotor
Flash Code 4 LOCKOUT
1. Low line voltage to compressor
2. Excessive liquid refrigerant in compressor
3. Compressor bearings are seized
Yellow “ALERT” Open Circuit
Flash Code 5
1. Outdoor unit power disconnect is open
2. Compressor circuit breaker or fuse(s) is open
3. Compressor contactor has failed open
4. High pressure switch is open and requires manual reset
5. Broken supply wires or connector is not making contact
6. Unusually long compressor protector reset time due to ex‐
treme ambient temperature
7. Compressor windings are damaged
Yellow “ALERT” Missing Phase
Flash Code 6
1. Compressor fuse is open on one phase
2. Broken wire or connector on one phase
3. Compressor motor winding is damaged
4. Utility supply has dropped one phase
LOCKOUT
Yellow “ALERT” Reverse Phase
Flash Code 7 LOCKOUT
1. Compressor running backward do to supply phase reversal
Yellow “ALERT” Welded Contactor
Flash Code 8 Compressor always runs
1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
1. Control circuit transformer is overloaded
2. Low line voltage to compressor
Yellow “ALERT” Low Voltage
Flash Code 9 Control circuit < 18VAC
S Flash Code number corresponds to a number of LED flashes, followed by a pause and then repeated.
S TRIP and ALERT LEDs flashing at same time means control circuit voltage is too low for operation.
S Reset ALERT Flash code by removing 24VAC power from module.
S Last ALERT Flash code is displayed for 1 minute after module is powered on.
S ALERT codes can be reset manually or automatically. ALERT codes that result in a lockout or compressor
lockout can only be reset manually.
- For manual reset, cycle power to Comfort Alert off and on.
- For automatic reset, Comfort Alert will continue to monitor compressor and system; if condition returns to
normal, the ALERT code is automatically turned off.
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INSTALLATION INSTRUCTIONS
3-phase R-410A Split System Heat Pump
Figure 17
Miswired Module Indication
Comfort Alertt Diagnostics (some models)
Troubleshooting Information
Green LED is not on, module Determine if both R and C module terminals are connected. Verify voltage is
does not power up present at module's R and C terminals.
Green LED intermittent, mod‐ Determine if R and Y terminals are wired in reverse. Verify module's R and C ter‐
ule powers up only when com‐ minals have a constant source.
pressor runs
TRIP LED is on but system
and compressor check OK
Verify Y terminal is wired properly per OEM wiring diagram. Verify voltage at con‐
tactor coil falls below 0.5VAC when off. Verify 24VAC is present across Y and C
when thermostat demand signal is present. If not, R and C are reverse wired.
TRIP LED and ALERT LED
flashing together
Verify R and C terminals are supplied with 19-28VAC.
ALERT Flash Code 3
(Compressor short cycling)
displayed incorrectly
Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at
contactor coil falls below 0.5VAC when off.
ALERT Flash Code 5 or 6 Check that compressor T1 and T3 wires are through module's current sensing
(Open Circuit, Missing Phase) holes. Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at
displayed incorrectly
contactor coil falls below 0.5VAC when off.
ALERT Flash Code 8
Determine if module's Y terminal is connected. Verify Y terminal is connected to
(Welded Contactor) displayed 24VAC at contactor coil. Verify 24VAC is present across Y and C when
incorrectly mostat demand signal is present. If not, R and C are reversed wired. Verify
voltage at contactor coil falls below 0.5VAC when off. Review.
ther‐
R-410A QUICK REFERENCE GUIDE
• R-410A refrigerant operates at 50% - 70% higher pressures than R-22. Be sure that servicing equipment and
replacement components are designed to operate with R-410A.
• R-410A refrigerant cylinders are rose colored.
• Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
• R-410A systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose.
• Manifold sets should be 750 psig high-side and 200 psig low-side with 520 psig low-side retard.
• Use hoses with 750 psig service pressure rating.
• Leak detectors should be designed to detect HFC refrigerant.
• R-410A, as with other HFC refrigerants, is only compatible with POE oils.
• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
• POE oils may cause damage to certain plastics and roofing materials.
• Vacuum pumps will not remove moisture from oil.
• A liquid line filter-drier is required on every unit.
• Do not use liquid line filter-driers with rated working pressures less than 600 psig.
• Do not install a suction line filter-drier in liquid line.
• Wrap all filter-driers and service valves with wet cloth when brazing.
• Do not use with an R-22 TXV.
• If indoor unit is equipped with an R-22 TXV, it must be changed to an R-410A TXV.
• Do not use capillary tube indoor coils.
• Never open system to atmosphere while it is under a vacuum.
• When system must be opened for service, break vacuum with dry nitrogen and replace all filter-driers.
• Do not vent R-410A into the atmosphere.
• Observe all WARNINGS, CAUTIONS, NOTES, and bold text.
International Comfort Products, LLC
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Lewisburg, TN 37091
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506 01 5102 00
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