INSTALLATION INSTRUCTIONS

R-410A Split System Air Conditioner

Product Family: N4A3, C4A3, H4A3, T4A3,
N4A4, C4A4, H4A4, T4A4

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 words DANGER, WARNING, The signal word WARNING is used throughout this
CAUTION, and NOTE are used to identify levels of manual in the following manner:
hazard seriousness. The signal word DANGER is
only used on product labels to signify an immediate ! WARNING
WARNING
hazard. The signal words WARNING, CAUTION,
and NOTE will be used on product labels and The signal word CAUTION is used throughout this
throughout this manual and other manuals that may manual in the following manner:
apply to the product.
DANGER - Immediate hazards which will result in ! CAUTION
severe personal injury or death.
WARNING - Hazards or unsafe practices which Signal Words on Product Labeling
could result in severe personal injury or death. Signal words are used in combination with colors
CAUTION - Hazards or unsafe practices which and/or pictures on product labels.
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 ! WARNING
Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 DEATH, PERSONAL INJURY, AND/OR PROPERTY
Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 - 3 DAMAGE HAZARD
Unit Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Failure to carefully read and follow this warning
Refrigeration System . . . . . . . . . . . . . . . . . . . . . . . . 5 - 8 could result in equipment malfunction, property
damage, personal injury and/or death.
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 - 10
Installation or repairs made by unqualified per‐
Start-up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 sons could result in equipment malfunction, prop‐
Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 erty damage, personal injury and/or death.
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . 11 The information contained in this manual is in‐
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 tended for use by a qualified service technician fa‐
miliar with safety procedures and equipped with
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 the proper tools and test instruments.
Comfort Alertt Diagnostics Codes . . . . . . . . . . . . . . 13 Installation must conform with local building
R-410A Quick Reference Guide . . . . . . . . . . . . . . . . . 14 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 R-410A Split System Air Conditioner

INSPECT NEW UNIT

After uncrating unit, inspect thoroughly for hidden company immediately and file a concealed damage
damage. If damage is found, notify the transportation claim.

SAFETY CONSIDERATIONS
Consult a qualified installer, service agency, or the
dealer/distributor for information and assistance. The ! WARNING
qualified installer must use factory authorized kits and
accessories when modifying this product. Refer to the ELECTRICAL SHOCK HAZARD
individual instructions packaged with the kit or accessory Failure to turn off the main (remote) electrical dis‐
when installing. connect device could result in personal injury or
The weight of the product requires careful and proper death.
handling procedures when lifting or moving to avoid Before installing, modifying or servicing system,
personal injury. Use care to avoid contact with sharp or turn OFF the main (remote) electrical disconnect
pointed edges. device. There may be more than one disconnect
Follow all safety codes. Wear safety glasses, protective device.
clothing, and work gloves. Use a heat sinking material -
such as a wet rag - during brazing operations. Keep a fire
extinguisher available. Consult local codes and the
National Electric Code (NEC) for special requirements.
! CAUTION
Improper installation, adjustment, alteration, service or PROPERTY DAMAGE HAZARD
maintenance can void the warranty. Failure to follow this caution may result in proper‐
ty damage
R-410A systems operate at higher pressures than
R-22 systems. When working with R-410A sys‐
tems, use only service equipment and replace‐
ment components specifically rated or approved
for R-410A service.

LOCATION
Check local codes for regulations concerning zoning, Locate unit away from recessed or confined areas where
noise, platforms, and other issues. recirculation of discharge air may occur (refer to
Locate unit away from fresh air intakes, vents, or CLEARANCES section of this document).
bedroom windows. Noise may carry into the openings Roof-top installation is acceptable providing the roof will
and disturb people inside. support the unit and provisions are made for water
Locate unit in a well drained area, or support unit high drainage and noise/vibration dampening.
enough so that water runoff will not enter the unit. NOTE: Roof mounted units exposed to wind may require
Locate unit away from areas where heat, lint, or exhaust wind baffles. Consult the manufacturer for additional
fumes will be discharged onto unit (as from dryer vents). information.

CLEARANCES
Nominal minimum clearances are 48 inches above unit Inside corner locations on single story structures require
for discharge air and 18 inches on each side of the coil for evaluation. Large overhanging soffits may cause air
intake air. Clearance on any one side of the coil (normally recirculation in a corner area even though recommended
between unit and structure) may be reduced to 6 inches. minimum clearances are maintained. As a guide, locate
Nominal minimum clearances are based on a solid the unit far enough out so that half of the discharge grille is
parallel object such as a wall or roof overhang. out from under the soffit.
The clearance may be reduced for a single object with When placing two or more units side-by-side, provide a
small surface area, such as the end of a wall, outside minimum of 18 inches between units.
corner of a wall, fence section, post, etc. As a general Provide minimum service clearance of 24 inches from
rule, the minimum clearance from the unit should equal control box corner and side service panel.
the width of the object. For example, a 6 inch fence post
should be a minimum of 6 inches from the unit. Refer to Figure 1.
Do not install unit under roof overhangs unless gutters are
present. A minimum vertical clearance of 48 inches is
required to the overhang.

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

Figure 1 Clearances (various examples)

Wall Wall

6”
24”
Service

24” 18”
Service

Wall
18” 6”

18”

18”

Wall Wall

6” 6”

24”
18” Service 18”
24”
Service

4” 6”
4”
wide fence
6”
Post

Wall

24” 24” 24”

Service Service Service

18” 18” 18” 18”

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

UNIT SUPPORT
NOTE: Unit must be level  2 degrees ( inch rise or fall Figure 2 Tie Down Knockouts
per foot of run) or compressor may not function properly.
A. GROUND LEVEL INSTALLATION ” dia. Tie Down Knockouts View From Top
In Base Pan (2 places) Product Family: N series
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 Base
Pan
2. Depth
If beams or an open platform are used for support, it is C
recommended that the soil be treated or area be graveled
to reduce the growth of grasses and weeds.
To minimize vibration or noise transmission, it is
recommended that supports not be in contact with the
building structure. However, slabs on grade constructions B
with an extended pad are normally acceptable.
B. ROOF TOP INSTALLATION A
Base Pan Width
This type of installation is not recommended on wood
frame structures where low noise levels are required. Base Pan Tie Down Minimum
Supporting structure or platform for the unit must be level. (Square) Knockouts Mounting Pad
If installation is on a flat roof, locate unit minimum 6 inches Width x Depth
A B C Dimensions
above roof level. (inches)
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 ” dia. Tie Down Knockouts View From Top
home or apartment, avoid locating the unit over In Base Pan (2 places) Product Family: C,H,T series
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 Base
tie down bolts through the holes (refer to Figure 2). Pan
Depth
Contact local distributor for hurricane hold-down details
and the P.E. (Professional Engineer) certification, when C
required.

! CAUTION B

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in proper‐ A
ty damage. Base Pan Width
Inadequate unit support may cause excessive
vibration, noise, and/or stress on the refrigerant Tie Down
lines, leading to refrigerant line failure. Base Pan Minimum
Knockouts Mounting Pad
Width x Depth
A B C Dimensions
”  ” ”
”  ”   ”
”  ” ” ” 
”   ”
”  ” ” ” ” ”  ”

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

REFRIGERATION SYSTEM
A. COMPONENT MATCHES B. REFRIGERANT LINE SETS
Check to see that the proper system components are in The refrigerant line set must be properly sized to assure
place, especially the indoor coil. maximum efficiency and proper oil circulation.
R-410A outdoor units can only be used with R-410A Refer to Product Specifications and Long Line
specific indoor coils. If there is a refrigerant mis-match, Applications Guideline for line set sizing.
consult the indoor coil manufacturer to determine if a NOTE: Total line set length must not exceed 200 feet.
refrigerant conversion kit is available for the indoor coil.
A crankcase heater must be used when the refrigerant
This outdoor unit is designed for use only with indoor coils line length exceeds 80 feet.
that utilize a TXV refrigerant metering device. If any other
type of metering device is installed on the indoor coil, If outdoor unit is more than 10 feet higher than the indoor
consult the indoor coil manufacturer to determine if a TXV coil, refer to the Extended Length Refrigeration Piping
conversion kit is available. Manual for instructions.
When the outdoor unit is higher than the indoor coil, the
vertical separation must not exceed 100 feet.
! CAUTION When the outdoor unit is lower than the indoor coil, the
vertical separation must not exceed 50 feet.
PRODUCT DAMAGE HAZARD
If it is necessary to add refrigerant line in the field, use
Failure to follow this caution may result in product dehydrated or dry, sealed, deoxidized, copper
damage. refrigeration tubing. Do not use copper water pipe.
Indoor coil and outdoor unit must be listed as a Do not remove rubber plugs or caps from copper tubing
certified combination (match) in the ARI Unitary until connections are ready to be made.
Directory of Certified Products. Be extra careful when bending refrigeration tubing.
Indoor coil must have R-410A specific, hard shut- Tubing can “kink” easily, and if this occurs, the entire
off TXV refrigerant metering device. length of tubing must be replaced.
When installing a TXV on an indoor coil, follow the
instructions provided with the new TXV.
A typical TXV installation is shown in Figure 3.

Figure 3 Typical TXV Installation

INDOOR
COIL
EQUALIZER
TUBE

SENSING SUCTION
BULB TUBE

LIQUID
TUBE

TXV

SENSING BULB
(EITHER SIDE) STRAP

ÉÉ ÉÉ
SUCTION

8 O'CLOCK
ÉÉ TUBE
ÉÉ 4 O'CLOCK

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

Fill all gaps with RTV caulk. This will prevent noise
! WARNING transmission between the tubing and the foundation or
wall.
PERSONAL INJURY HAZARD Along floor or ceiling joists, suspend refrigerant lines so
Failure to relieve system pressure could result in that they do not contact the building structure, water
personal injury and/or death. pipes, or ductwork. Use insulated or suspension type
hangers. Metal straps must be at least 1” wide to avoid
Relieve pressure and recover all refrigerant before cutting into the tube insulation. Keep the liquid and
servicing existing equipment, and before final unit suction lines separate. Refer to Figure 4.
disposal. Use all service ports and open all flow-
control devices, including solenoid valves.

C. ROUTING AND SUSPENDING REFRIGERANT

! CAUTION
LINES UNIT OPERATION HAZARD
Run refrigerant lines as straight and direct as possible, Failure to follow this caution may result in improp‐
avoiding unnecessary bends and turns. Always insulate er product operation.
the entire suction line. Both lines should be insulated
when routed through an attic or when routed through an Do not leave system open to atmosphere any lon‐
underground raceway. ger than absolutely required for installation. Inter‐
When routing refrigerant lines through a foundation or nal system components - especially refrigerant
wall, do not allow refrigerant lines to come in direct oils - are extremely susceptible to moisture con‐
contact with the building structure. Make openings large tamination. Keep ends of tubing sealed during
enough so that lines can be wrapped with extra insulation. installation until the last possible moment.

Figure 4 Routing and Suspending Refrigerant Lines

JOIST
OUTDOOR WALL INDOOR WALL
HANGER STRAP
CAULK (AROUND SUCTION
TUBE ONLY) INSULATION
LIQUID TUBE
SUCTION TUBE

SUCTION TUBE
INSULATION
1” MIN
LIQUID TUBE
THROUGH THE WALL SUSPENSION

D. OUTDOOR UNIT HIGHER THAN INDOOR UNIT

! CAUTION Proper oil return to the compressor should be maintained
with suction gas velocity. If velocities drop below 1500
UNIT OPERATION HAZARD fpm (feet per minute), oil return will be decreased. To
Failure to follow this caution may result in improp‐ maintain suction gas velocity, do not upsize vertical
er product operation. suction risers.

Do not bury more than 36” of line set underground. E. LIQUID LINE FILTER-DRIER
Refrigerant may migrate to cooler buried section Outdoor units are shipped with an appropriate filter-drier
during extended periods of unit shut-down, caus‐ for installation in the liquid line. Leave the plugs in the tube
ing refrigerant slugging and possible compressor ends until the filter-drier is installed. The optimal location
damage at start-up. for the filter-drier is close to the indoor coil. Install the
If ANY section of the line set is buried under‐ filter-drier with the arrow pointing towards the indoor coil.
ground, provide a minimum 6” vertical rise at the Refer to Figure 5.
service valve.

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

Liquid Line Filter-Drier G. BRAZING CONNECTIONS

Figure 5
Installed at Indoor Coil
! WARNING
FIRE HAZARD
Failure to remove refrigerant and oil charge before
brazing could result in personal injury, death, and/
or property damage.
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.
Clean line set tube ends with emery cloth or steel brush.
Remove any grit or debris.
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.

! CAUTION
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.
Filter-Drier 38-11-84 Braze with Sil-Fos or Phos-copper alloy on cop‐
(arrow points towards indoor coil) per-to-copper joints and wrap a wet cloth around
rear of fitting to prevent damage to TXV.
F. SERVICE VALVES
H. EVACUATING LINE SET AND INDOOR COIL
Service valves are closed and tube stubs are plugged
from the factory. Outdoor units are shipped with a The unit is shipped with a factory refrigerant charge. The
refrigerant charge sealed in the unit. Leave the service liquid line and suction line service valves have been
valves closed until all other refrigerant system work is closed after final testing at the factory. Do not disturb
complete or the charge will be lost. Leave the plugs in these valves until the line set and indoor coil have been
place until line set tubing is ready to be inserted. evacuated and leak checked, or the charge in the unit
may be lost.
Service valve bodies are brass and tube stubs are
copper. 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.

! CAUTION
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.
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.
If vacuum must be interrupted during the evacuation
procedure, always break vacuum with dry nitrogen.

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

Deep Vacuum Method Figure 7 Triple Evacuation Sequence

The deep vacuum method requires a vacuum pump
capable of pulling a vacuum to 500 microns and a vacuum EVACUATE
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. BREAK VACUUM WITH DRY NITROGEN

Watch the vacuum gauge as the system is pulling down.

The response of the gauge is an indicator of the condition WAIT
of the system (refer to Figure 6).
With no leaks in the system, allow the vacuum pump to EVACUATE
run for 30 minutes minimum at the deep vacuum level.
BREAK VACUUM WITH DRY NITROGEN
Deep Vacuum Gauge Response
Figure 6
and System Conditions
WAIT
5000
4500 EVACUATE
4000
LEAK IN CHECK FOR TIGHT, DRY SYSTEM
3500
SYSTEM
(IF IT HOLDS DEEP VACUUM)
MICRONS

3000
2500
CHARGE SYSTEM
2000
1500 VACUUM TIGHT
TOO WET
1000 I. OPENING SERVICE VALVES
TIGHT Outdoor units are shipped with a refrigerant charge
500 DRY SYSTEM sealed in the unit. Opening the service valves releases
this charge into the system.
0 1 2 3 4 5 6 7
MINUTES 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
Triple Evacuation Method
flow and affecting operation of the system.
The triple evacuation method should only be used when
Remove Suction service valve cap and insert a hex
system does not contain any water in liquid form and
vacuum pump is only capable of pulling down to 28 inches wrench into the valve stem. Hold the valve body steady
with an end-wrench and back out the stem by turning the
of mercury. Refer to Fig. 7 and proceed is as follows:
hex wrench counterclockwise. Turn the stem until it just
1. Pull system down to 28 inches of mercury and contacts the rolled lip of the valve body.
allow pump to continue operating for an additional After the refrigerant charge has bled into the system,
15 minutes.
open the Liquid service valve.
2. Close manifold valves or valve at vacuum pump
NOTE: These are not back-seating valves. It is not
and shut off vacuum pump.
necessary to force the stem tightly against the rolled lip.
3. Connect a nitrogen cylinder and regulator to
system and fill with nitrogen until system pressure The service valve cap is a primary seal for the valve and
is 2 psig. must be properly tightened to prevent leaks. Make sure
cap is clean and apply refrigerant oil to threads and
4. Close nitrogen valve and allow system to stand for sealing surface on inside of cap.
1 hour. During this time, dry nitrogen will diffuse
throughout the system absorbing moisture. Tighten cap finger tight and then tighten additional  of a
turn (1 wrench flat) to properly seat the sealing surfaces.
5. Repeat this procedure as indicated in Figure 7.
6. After the final evacuate sequence, confirm there J. GAUGE PORTS
are no leaks in the system. If a leak is found, repeat Check for leaks at the schrader ports and tighten valve
the entire process after repair is made. cores if necessary. Install plastic caps finger tight.

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

ELECTRICAL WIRING
Wiring Connections
! WARNING Make all outdoor electrical supply (Line Voltage)
connections with raintight conduit and fittings. Most
ELECTRICAL SHOCK HAZARD codes require a disconnect switch outdoors within sight of
Failure to turn off the main (remote) electrical dis‐ the unit. Consult local codes for special requirements.
connect device could result in personal injury or Route electrical supply (Line Voltage) wiring through
death. knockout hole in bottom of Control Box. Connect wires to
Contactor and Ground Lug according to Wiring Diagram
Before installing, modifying or servicing system,
on unit. Refer to Figure 8.
turn OFF the main (remote) electrical disconnect
device. There may be more than one disconnect Route thermostat wiring through rubber grommet in
device. bottom of Control Box. Low voltage lead wires are
provided in the control box for connection to thermostat
The supply voltage must be 208/230 volts (197 volt wires (use wire nuts). Refer to Wiring Diagram on unit and
minimum to 253 volts maximum) 60 Hz single phase. Figure 9 for low voltage wiring examples.
Outdoor units are approved for use with copper NOTE: Use No. 18 AWG (American Wire Gage)
conductors only. Do not use aluminum wire. color-coded, insulated (35 °C minimum) wire. If
Refer to unit rating plate for minimum circuit ampacity and thermostat is located more than 100 feet (30.5 m) from
circuit protection requirements. unit as measured along the control voltage wires, use No.
16 AWG color-coded wires to avoid excessive voltage
Grounding
drop.
Permanently ground unit in accordance with the National
Electrical Code and local codes or ordinances. Use a NOTE: Some models are factory equipped with Comfort
copper conductor of the correct size from the grounding Alertt Diagnostics device. If Comfort Alert is used as a
lug in control box to a grounded connection in the service field installed option, then a hot bundle must be run for
panel or a properly driven and electrically grounded proper connection.
ground rod.
Figure 8 Electrical Supply (Line Voltage) Connections
DISCONNECT
PER NEC AND/OR
LOCAL CODES
CONTACTOR
11
L1
FIELD POWER
WIRING L2
23 or 13
FIELD GROUND
WIRING
GROUND
LUG

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

Figure 9 Typical Thermostat Connections

THERMOSTAT FURNACE AIR CONDITIONER

24 VAC HOT R R

24 VAC COM C C

HEAT STAGE 1 W/W1 W C

COOL STAGE 1 Y/Y2 Y

INDOOR FAN G G

THERMOSTAT FAN COIL AIR CONDITIONER

24 VAC HOT R R

24 VAC COM C C

HEAT STAGE 1 W/W1 W2 C

COOL STAGE 1 Y/Y2 Y

INDOOR FAN G G

AC with Red wire

connected to power
THERMOSTAT FAN COIL Comfort Alert

24 VAC HOT R R R

24 VAC COM C C C

HEAT STAGE 1 W/W1 W2

COOL STAGE 1 Y/Y2 Y Y

INDOOR FAN G G

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

START-UP PROCEDURE
1. Set indoor thermostat selector switch to OFF. 4. Set indoor thermostat at desired temperature. Be
2. Turn ON all electrical disconnect devices. sure setpoint is below indoor ambient temperature
or thermostat will not call for cooling.
3. If unit has a crankcase heater, energize the heater
and wait 24 hours before proceeding. 5. Set indoor thermostat selector switch to COOL.
Operate unit for minimum 15 minutes, then check
the system refrigerant charge.
REFRIGERANT CHARGE
Outdoor units are shipped with a refrigerant charge to 2. Measure liquid service valve pressure by attaching
match a specific indoor coil and 15 feet of refrigerant line. an accurate gauge to service port.
If shorter or longer refrigerant lines or a different indoor 3. Measure liquid line temperature by attaching an
coil are used, the charge will have to be adjusted. accurate thermistor type sensor or electronic
For different line lengths, add or remove charge based on thermometer to liquid line near outdoor coil.
0.6 ounces charge per foot of difference. For example, a 4. Refer to unit rating plate for required subcooling
25 foot line set is 10 feet longer than the specified 15 feet. temperature.
Add 0.6 ounces charge for each of the extra 10 feet: 5. Refer to Figure 10. Find the required liquid line
10 x 0.6 = 6.0 ounces additional charge temperature where the rating plate subcooling
This outdoor unit is designed for use only with indoor coils temperature intersects measured liquid service
that utilize a TXV refrigerant metering device. With an valve pressure.
indoor TXV, use the subcooling method to make final 6. If the measured liquid line temperature is higher
charge adjustments: than the chart number, add refrigerant to lower the
measured temperature.
NOTE: Only use subcooling charging method when
S outdoor ambient temperature is between 70_F and 100_F NOTE: When adding refrigerant, charge in liquid form,
S indoor temperature is between 70_ and 80_F using a flow restricting device, into the suction port.
S line set is less that 80 feet. If the measured liquid line temperature is lower than the
1. Operate unit a minimum of 15 minutes before chart number, reclaim refrigerant to raise the measured
checking charge. temperature.
NOTE: If outdoor unit has a 2-speed fan motor, Tolerance is  3 °F.
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.

Figure 10 R-410A Required Liquid Line Temperature (°F)

Rating Plate (required) Rating Plate (required)
Measured Liquid Subcooling Temperature (°F) Measured Liquid Subcooling Temperature (°F)
Pressure (psig) Pressure (psig)
6 8 10 12 14 16 6 8 10 12 14 16
251 78 76 74 72 70 68 364 104 102 100 98 96 94
259 80 78 76 74 72 70 374 106 104 102 100 98 96
266 82 80 78 76 74 72 384 108 106 104 102 100 98
274 84 82 80 78 76 74 395 110 108 106 104 102 100
283 86 84 82 80 78 76 406 112 110 108 106 104 102
291 88 86 84 82 80 78 416 114 112 110 108 106 104
299 90 88 86 84 82 80 427 116 114 112 110 108 106
308 92 90 88 86 84 82 439 118 116 114 112 110 108
317 94 92 90 88 86 84 450 120 118 116 114 112 110
326 96 94 92 90 88 86 462 122 120 118 116 114 112
335 98 96 94 92 90 88 474 124 122 120 118 116 114
345 100 98 96 94 92 90

SEQUENCE OF OPERATION
With power supplied to indoor and outdoor units, When thermostat is satisfied, its contacts open,
transformer is energized. de-energizing contactor and blower relay. Compressor
On a call for cooling, the thermostat makes circuits R-Y and motors stop.
and R-G. Circuit R-Y energizes contactor, starting NOTE: If indoor unit is equipped with a time-delay relay
outdoor fan motor and compressor. Circuit R-G circuit, the blower runs an additional length of time to
energizes indoor unit blower relay, starting indoor blower increase system efficiency.
motor.

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INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

TROUBLESHOOTING
Some models are factory equipped with the Comfort Comfort Alertt Diagnostics
Alertt Diagnostics device in the control box (refer to Figure 11
(some models)
Figure 11). Comfort Alert provides around-the-clock
monitoring for common electrical problems, compressor Compressor Wires
defects, and broad system faults. If trouble is detected, an Pass Through Holes (3)
alert code is displayed with a flashing LED indicator. Alert
codes are listed in Figure 12.
The device is factory wired and requires no
modification. Low voltage lead wires are provided in the “Power” LED
control box for connection to thermostat wires (use wire R
nuts).
NOTE: The RED (R) low voltage lead wire is provided Thermostat Demand
only for powering the Comfort Alert device. To utilize the C Y
Comfort Alert device, connect the RED (R) low voltage
lead wire directly to 24 VAC hot at the indoor unit or C
24 VAC Common
thermostat. Use one of the spare wires in the thermostat S R
cable to bring 24 VAC hot out to the outdoor unit. If there
are no spare wires in the thermostat cable, leave the “Alert” LED
insulation on the end of the RED low voltage lead wire to
avoid an electrical short. The air conditioner will “Trip” LED
function normally without the RED (R) low voltage 24 VAC Hot
lead wire connected.
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.

MAINTENANCE
Condensate Drain
During the cooling season, check monthly for free flow of
drainage and clean if necessary.
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.
2. Keep the coil free of grass clippings, leaves,
weeds, and other debris.
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.
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.

12 421 01 5101 00
INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

Figure 12 Comfort Alertt Diagnostics (some models)

Status LED Status LED Description Status LED Troubleshooting Information
Green “POWER” Module has power Supply voltage is present at module terminals
Red “TRIP” Thermostat demand signal 1. Compressor protector is open
Y1 is present, but the com‐ 2. Outdoor unit power disconnect is open
pressor is not running 3. Compressor circuit breaker or fuse(s) is open
4. Broken wire or connector is not making contact
5. Low pressure switch open if present in system
6. Compressor contactor has failed open
Yellow “ALERT” Long Run Time 1. Low refrigerant charge
Flash Code 1 Compressor is running ex‐ 2. Evaporator blower is not running
tremely long run cycles 3. Evaporator coil is frozen
4. Faulty metering device
5. Condenser coil is dirty
6. Liquid line restriction (filter drier blocked if present in system)
7. Thermostat is malfunctioning
Yellow “ALERT” System Pressure Trip 1. High head pressure
Flash Code 2 Discharge or suction pres‐ 2. Condenser coil poor air circulation (dirty, blocked, damaged)
sure out of limits or com‐ 3. Condenser fan is not running
pressor overloaded 4. Return air duct has substantial leakage
5. If low pressure switch present in system, check Flash Code 1
information
Yellow “ALERT” Short Cycling 1. Thermostat demand signal is intermittent
Flash Code 3 Compressor is running only 2. Time delay relay or control board defective
briefly 3. If high pressure switch present go to Flash Code 2 informa‐
tion
4. If low pressure switch present go to Flash Code 1 informa‐
tion
Yellow “ALERT” Locked Rotor 1. Run capacitor has failed
Flash Code 4 2. Low line voltage (contact utility if voltage at disconnect is low)
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
Yellow “ALERT” Open Circuit 1. Outdoor unit power disconnect is open
Flash Code 5 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. Open circuit in compressor supply wiring or connections
6. Unusually long compressor protector reset time due to ex‐
treme ambient temperature
7. Compressor windings are damaged
Yellow “ALERT” Open Start Circuit 1. Run capacitor has failed
Flash Code 6 Current only in run circuit 2. Open circuit in compressor start wiring or connections
3. Compressor start winding is damaged
Yellow “ALERT” Open Run Circuit 1. Open circuit in compressor run wiring or connections
Flash Code 7 Current only in start circuit 2. Compressor run winding is damaged
Yellow “ALERT” Welded Contactor 1. Compressor contactor has failed closed
Flash Code 8 Compressor always runs 2. Thermostat demand signal not connected to module
Yellow “ALERT” Low Voltage 1. Control circuit transformer is overloaded
Flash Code 9 Control circuit < 17VAC 2. Low line voltage (contact utility if voltage at disconnect is low)
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.

421 01 5101 00 13
INSTALLATION INSTRUCTIONS R-410A Split System Air Conditioner

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.

• Vacuum pumps will not remove moisture from oil.

• 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.

• POE oils absorb moisture rapidly. Do not expose oil to atmosphere.

• POE oils may cause damage to certain plastics and roofing materials.

• Wrap all filter-driers and service valves with wet cloth when brazing.

• A liquid line filter-drier is required on every unit.

• 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.

• 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.

• Do not use capillary tube indoor coils.

• Observe all WARNINGS, CAUTIONS, NOTES, and bold text.

International Comfort Products, LLC

14 Lewisburg, TN 37091 421 01 5101 00