INSTALLATION INSTRUCTIONS
R−410A Split System Air Conditioner
Model Series: N4A3, H4A3, C4A3, T4A3
N4A4, H4A4, C4A4, T4A4
These instructions must be read and understood completely before attempting installation.
Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and
NOTE
The signal words DANGER, WARNING,
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.
DANGER − Immediate hazards which will result in
severe personal injury or death.
WARNING − Hazards or unsafe practices which
could result in severe personal injury or death.
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.
Signal Words in Manuals
The signal word WARNING is used throughout this
manual in the following manner:
WARNING
!
The signal word CAUTION is used throughout this
manual in the following manner:
!
Signal Words on Product Labeling
Signal words are used in combination with colors
and/or pictures on product labels.
WARNING
CAUTION
TABLE OF CONTENTS
Inspect New Unit 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Considerations 2. . . . . . . . . . . . . . . . . . . . . . . . . . .
Location 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Clearances 2 − 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unit Support 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigeration System 4 − 8. . . . . . . . . . . . . . . . . . . . . . . .
Electrical Wiring 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start−up Procedure 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Refrigerant Charge 10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sequence of Operation 10. . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
R−410A Quick Reference Guide 13. . . . . . . . . . . . . . . . .
!
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 persons could result in equipment malfunction, property damage, personal injury and/or death.
The information contained in this manual is intended for use by a qualified service technician familiar 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.
WARNING
421 01 5100 01 October 2006
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
INSPECT NEW UNIT
After uncrating unit, inspect thoroughly for hidden damage. If damage is found, notify the transportation company immediately and file a concealed damage claim.
SAFETY CONSIDERATIONS
Consult a qualified installer, service agency, or the dealer/
distributor for information and assistance. The qualified
installer must use factory authorized kits and accessories
when modifying this product. Refer to the individual instructions packaged with the kit or accessory when installing.
The weight of the product requires careful and proper
handling procedures when lifting or moving to avoid personal injury. Use care to avoid contact with sharp or
pointed edges.
Follow all safety codes. Wear safety glasses, protective
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.
Improper installation, adjustment, alteration, service or
maintenance can void the warranty.
!
ELECTRICAL SHOCK HAZARD
Failure to turn off the main (remote) electrical disconnect device could result in personal 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.
!
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage
R−410A systems operate at higher pressures than
R−22 systems. When working with R−410A systems, use only service equipment and replacement components specifically rated or approved
for R−410A service.
WARNING
CAUTION
LOCATION
Check local codes for regulations concerning zoning,
noise, platforms, and other issues.
Locate unit away from fresh air intakes, vents, or bedroom windows. Noise may carry into the openings and
disturb people inside.
Locate unit in a well drained area, or support unit high
enough so that water runoff will not enter the unit.
Locate unit away from areas where heat, lint, or exhaust
fumes will be discharged onto unit (as from dryer vents).
CLEARANCES
Nominal minimum clearances are 48 inches above unit
for discharge air and 18 inches on each side of the coil for
intake air. Clearance on any one side of the coil (normally
between unit and structure) may be reduced to 6 inches.
Nominal minimum clearances are based on a solid parallel object such as a wall or roof overhang.
The clearance may be reduced for a single object with
small surface area, such as the end of a wall, outside corner of a wall, fence section, post, etc. As a general rule,
the minimum clearance from the unit should equal the
width of the object. For example, a 6 inch fence post
should be a minimum of 6 inches from the unit.
Do not install unit under roof overhangs unless gutters are
present. A minimum vertical clearance of 48 inches is required to the overhang.
Locate unit away from recessed or confined areas where
recirculation of discharge air may occur (refer to CLEARANCES section of this document).
Roof−top installation is acceptable providing the roof will
support the unit and provisions are made for water drainage and noise/vibration dampening.
NOTE: Roof mounted units exposed to wind may require
wind baffles. Consult the manufacturer for additional information.
Inside corner locations on single story structures require
evaluation. Large overhanging soffits may cause air recirculation in a corner area even though recommended minimum clearances are maintained. As a guide, locate the
unit far enough out so that half of the discharge grille is out
from under the soffit.
When placing two or more units side−by−side, provide a
minimum of 18 inches between units.
Provide minimum service clearance of 24 inches from
control box corner and side service panel.
Refer to Figure 1.
2 421 01 5100 01
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
Figure 1 Clearances (various examples)
24”
Service
Wall
6”
18”
Wall
6”
18”
18”
Wall
24”
Service
Wall
6”
18”
Wall
6”
24”
Service
18”
24”
Service
4”
18”
18”
4”
wide fence
Wall
24”
Service
24”
Service
18”
18”
6”
6”
Post
24”
Service
18”
421 01 5100 01 3
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
UNIT SUPPORT
NOTE: Unit must be level 2 degrees ( inch rise or fall
per foot of run) or compressor may not function properly.
A. GROUND LEVEL INSTALLATION
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.
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.
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. ROOF TOP INSTALLATION
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.
!
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Inadequate unit support may cause excessive
vibration, noise, and/or stress on the refrigerant
lines, leading to refrigerant line failure.
Figure 2 Tie Down Knockouts
A
Base Pan
Width x Depth
” ” ” ” ” ”
” ” ” ” ” ”
” ” ” ” ” ” ”
CAUTION
” dia. Tie Down Knockouts
In Base Pan (2 places)
VIEW
FROM
TOP
Base Pan Width
Tie Down
Knockouts
A B C
Base
Pan
Depth
C
B
Minimum
Mounting Pad
Dimensions
REFRIGERATION SYSTEM
A. COMPONENT MATCHES
Check to see that the proper system components are in
place, especially the indoor coil.
R−410A outdoor units can only be used with R−410A spe-
cific 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.
This outdoor unit is designed for use only with indoor coils
that utilize a hard shut−off 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 hard shut−off TXV conversion kit is available.
4 421 01 5100 01
!
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.
Indoor coil must have R−410A specific, hard shut−
off TXV refrigerant metering device.
CAUTION
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
When installing a hard shut−off TXV on an indoor coil, follow the instructions provided with the new TXV.
A typical hard shut−off TXV installation is shown in Figure
3.
Figure 3 Typical TXV Installation
INDOOR
EQUALIZER
TUBE
SENSING
BULB
HARD
SHUT−OFF
TXV
COIL
SUCTION
TUBE
LIQUID
TUBE
B. REFRIGERANT LINE SETS
The refrigerant line set must be properly sized to assure
maximum efficiency and proper oil circulation. Select line
set tube diameters as specified in Figure 4.
NOTE: Total line set length must not exceed 200 feet.
NOTE: A crankcase heater must be used when the refrig-
erant line length exceeds 80 feet.
If outdoor unit is more than 10 feet higher than the indoor
coil, refer to the Extended Length Refrigeration Piping
Manual for instructions.
NOTE: When the outdoor unit is higher than the indoor
coil, the vertical separation must not exceed 100 feet.
NOTE: When the outdoor unit is lower than the indoor
coil, the vertical separation must not exceed 50 feet.
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.
Do not remove rubber plugs or caps from copper tubing
until connections are ready to be made.
Be extra careful when bending refrigeration tubing. Tubing can “kink” easily, and if this occurs, the entire length of
tubing must be replaced.
SENSING BULB
(EITHER SIDE)
SUCTION
TUBE
8 O’CLOCK 4 O’CLOCK
Figure 4 R−410A Line Set Tube Diameter (Liquid Tube Always a"” dia.)
Service Valve Fittings Line Set < 80 feet long Line Set 80 − 200 feet long
Model Size
18 (1 ton), 24 (2 ton) ” ” ” ”
30 (2 ton), 36 (3 ton) ” ” ” ”
42 (3 ton), 48 (4 ton) ” ” ” ”
60 (5 ton) ” ” ” ”
NOTE: If the line set length exceeds 80 feet, also refer to Extended Length Refrigeration Piping Manual for additional information.
!
PERSONAL INJURY HAZARD
Failure to relieve system pressure could result in
personal injury and/or death.
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.
WARNING
Liquid Suction Suction Line Diameter Suction Line Diameter
STRAP
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper product operation.
Do not leave system open to atmosphere any longer than absolutely required for installation. Internal system components − especially refrigerant
oils − are extremely susceptible to moisture contamination. Keep ends of tubing sealed during
installation until the last possible moment.
CAUTION
421 01 5100 01 5
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
C. ROUTING AND SUSPENDING REFRIGERANT
LINES
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.
When routing refrigerant lines through a foundation or
wall, do not allow refrigerant lines to come in direct con-
enough so that lines can be wrapped with extra insulation.
Fill all gaps with RTV caulk. This will prevent noise transmission between the tubing and the foundation or wall.
Along floor or ceiling joists, suspend refrigerant lines so
that they do not contact the building structure, water
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 5.
tact with the building structure. Make openings large
Figure 5 Routing and Suspending Refrigerant Lines
OUTDOOR WALL INDOOR WALL
CAULK
INSULATION
THROUGH THE WALL SUSPENSION
LIQUID TUBE
SUCTION TUBE
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
1” MIN
JOIST
INSULATION
SUCTION TUBE
LIQUID TUBE
!
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in improper 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, causing refrigerant slugging and possible compressor
damage at start−up.
If ANY section of the line set is buried underground, 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. Use the “<80 feet” suction line sizes shown
Figure 4.
Install oil traps every 20 feet of vertical suction line riser
(refer to Figure 6).
Figure 6
Oil Traps for Outdoor Unit Higher
than Indoor Coil
10” Max.
3” Min.
20 ft.
20 ft.
6 421 01 5100 01
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
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. Install the filter−drier with the arrow pointing towards the indoor coil.
Refer to Figure 7.
Figure 7
Liquid Line Filter−Drier
Installed at Indoor Coil
G. BRAZING CONNECTIONS
!
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 before 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.
!
WARNING
CAUTION
Filter−Drier
(arrow points towards indoor coil)
F. SERVICE VALVES
Service valves are closed and tube stubs are 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.
Service valve bodies are brass and tube stubs are copper.
38−11 −84
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.
Braze with Sil−Fos or Phos−copper alloy on copper−to−copper joints and wrap a wet cloth around
rear of fitting to prevent damage to TXV.
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.
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.
!
PRODUCT DAMAGE HAZARD
Failure to follow this caution may result in product
damage.
Never use the outdoor unit compressor as a vacuum pump. Doing so may damage the compressor.
CAUTION
421 01 5100 01 7
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.
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
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.
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 8).
With no leaks in the system, allow the vacuum pump to
run for 30 minutes minimum at the deep vacuum level.
Figure 8
5000
4500
4000
3500
3000
2500
2000
MICRONS
1500
1000
500
Deep Vacuum Gauge Response
and System Conditions
01
246
375
MINUTES
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
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 Fig. 9 and proceed is as follows:
1. Pull system down to 28 inches of mercury and allow pump to continue operating for an additional 15
minutes.
2. Close manifold valves or valve at vacuum pump
and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and fill with nitrogen until system pressure is 2
psig.
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 9.
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.
Figure 9 Triple Evacuation Sequence
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
CHARGE SYSTEM
I. OPENING SERVICE VALVES
Outdoor units are shipped with a refrigerant charge
sealed in the unit. Opening the service valves releases
this charge into the system.
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.
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.
After the refrigerant charge has bled into the system,
open the Liquid service valve.
NOTE: These are not back−seating valves. It is not nec-
essary 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 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.
8 421 01 5100 01
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
ELECTRICAL WIRING
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to turn off the main (remote) electrical disconnect device could result in personal 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.
The supply voltage must be 208/230 volts (197 volt minimum to 253 volts maximum) 60 Hz single phase.
Outdoor units are approved for use with copper conductors only. Do not use aluminum wire.
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.
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. Connect wires to
Contactor and Ground Lug according to Wiring Diagram
on unit. Also refer to Figure 10.
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.
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.
Figure 10
DISCONNECT
PER NEC AND/OR
LOCAL CODES
FIELD POWER
WIRING
FIELD GROUND
WIRING
Electrical Supply (Line Voltage)
Connections
CONTACTOR
L1
L2
GROUND
11
23 or 13
LUG
Figure 11 Typical Thermostat Connections
R
C
WHEAT STAGE 1
Y
G
R
C
W2HEAT STAGE 1
Y
G
AIR CONDITIONER
C
AIR CONDITIONER
C
THERMOSTAT FURNACE
24 VAC HOT
24 VAC COM
COOL STAGE 1
INDOOR FAN
THERMOSTAT FAN COIL
24 VAC HOT
24 VAC COM
COOL STAGE 1
INDOOR FAN
R
C
W/W1
Y/Y2
G
R
C
W/W1
Y/Y2
G
START−UP PROCEDURE
1. Set indoor thermostat selector switch to OFF.
2. Turn ON all electrical disconnect devices.
3. If unit has a crankcase heater, energize the heater
and wait 24 hours before proceeding.
4. Set indoor thermostat at desired temperature. Be
sure setpoint is below indoor ambient temperature
or thermostat will not call for cooling.
5. Set indoor thermostat selector switch to COOL.
Operate unit for minimum 10 minutes, then check
the system refrigerant charge.
421 01 5100 01 9
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
REFRIGERANT CHARGE
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.
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:
10 x 0.6 = 6.0 ounces additional charge
This outdoor unit is designed for use only with indoor coils
that utilize a hard shut−off TXV refrigerant metering device. With a hard shut−off indoor TXV, use the subcooling
method to make final charge adjustments:
1. Operate unit a minimum of 10 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.
Figure 12 R−410A Required Liquid Line Temperature (°F)
Rating Plate (required)
Measured Liquid
Pressure (psig)
189 60 58 56 54 52 50 326 96 94 92 90 88 86
195 62 60 58 56 54 52 335 98 96 94 92 90 88
202 64 62 60 58 56 54 345 100 98 96 94 92 90
208 66 64 62 60 58 56 354 102 100 98 96 94 92
215 68 66 64 62 60 58 364 104 102 100 98 96 94
222 70 68 66 64 62 60 374 106 104 102 100 98 96
229 72 70 68 66 64 62 384 108 106 104 102 100 98
236 74 72 70 68 66 64 395 110 108 106 104 102 100
243 76 74 72 70 68 66 406 112 110 108 106 104 102
251 78 76 74 72 70 68 416 114 112 110 108 106 104
259 80 78 76 74 72 70 427 116 114 112 110 108 106
266 82 80 78 76 74 72 439 118 116 114 112 110 108
274 84 82 80 78 76 74 450 120 118 116 114 112 11 0
283 86 84 82 80 78 76 462 122 120 118 11 6 114 112
291 88 86 84 82 80 78 474 124 122 120 118 116 114
299 90 88 86 84 82 80 486 126 124 122 120 118 116
308 92 90 88 86 84 82 499 128 126 124 122 120 118
317 94 92 90 88 86 84 511 130 128 126 124 122 120
Subcooling Temperature (°F)
6 8 10 12 14 16 6 8 10 12 14 16
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.
4. Refer to unit rating plate for required subcooling
temperature.
5. Refer to Figure 12. Find the required liquid line
temperature where the rating plate subcooling
temperature intersects measured liquid service
valve pressure.
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.
Tolerance is 3 °F.
Measured Liquid
Pressure (psig)
Subcooling Temperature (°F)
Rating Plate (required)
SEQUENCE OF OPERATION
With power supplied to indoor and outdoor units, transformer is energized.
On a call for cooling, the thermostat makes circuits R−Y
and R−G. Circuit R−Y energizes contactor, starting outdoor fan motor and compressor. Circuit R−G energizes
indoor unit blower relay, starting indoor blower motor.
10 421 01 5100 01
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.
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
TROUBLESHOOTING
Some models are factory equipped with the Comfort
Alertt Diagnostics device in the control box (refer to Figure 13). 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. Alert
codes are listed in Figure 14.
The device 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).
NOTE: The RED (R) low voltage lead wire is provided
only for powering the Comfort Alert device. To utilize the
Comfort Alert device, connect the RED (R) low voltage
lead wire directly to 24 VAC hot at the indoor unit or thermostat. Use one of the spare wires in the thermostat
cable to bring 24 VAC hot out to the outdoor unit. If there
are no spare wires in the thermostat cable, leave the insulation on the end of the RED low voltage lead wire to
avoid an electrical short. The air conditioner will
function normally without the RED (R) low voltage
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.
Figure 13
24 VAC Hot
Comfort Alertt Diagnostics
(some models)
Compressor Wires
Pass Through Holes (3)
R
C
S
Y
C
R
“Power” LED
Thermostat Demand
24 VAC Common
“Alert” LED
“Trip” LED
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.
421 01 5100 01 11
INSTALLATION INSTRUCTIONS R−410A Split System Air Conditioner
Figure 14 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
Y1 is present, but the compressor is not running
1. Compressor protector is open
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. Low pressure switch open if present in system
6. Compressor contactor has failed open
Yellow “ALERT”
Flash Code 1
Long Run Time
Compressor is running extremely long run cycles
1. Low refrigerant charge
2. Evaporator blower is not running
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”
Flash Code 2
System Pressure Trip
Discharge or suction pressure out of limits or compressor overloaded
1. High head pressure
2. Condenser coil poor air circulation (dirty, blocked, damaged)
3. Condenser fan is not running
4. Return air duct has substantial leakage
5. If low pressure switch present in system, check Flash Code 1
information
Yellow “ALERT”
Flash Code 3
Short Cycling
Compressor is running only
briefly
1. Thermostat demand signal is intermittent
2. Time delay relay or control board defective
3. If high pressure switch present go to Flash Code 2 information
4. If low pressure switch present go to Flash Code 1 information
Yellow “ALERT”
Flash Code 4
Locked Rotor
1. Run capacitor has failed
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”
Flash Code 5
Open Circuit
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. Open circuit in compressor supply wiring or connections
6. Unusually long compressor protector reset time due to extreme ambient temperature
7. Compressor windings are damaged
Yellow “ALERT”
Flash Code 6
Open Start Circuit
Current only in run circuit
1. Run capacitor has failed
2. Open circuit in compressor start wiring or connections
3. Compressor start winding is damaged
Yellow “ALERT”
Flash Code 7
Yellow “ALERT”
Flash Code 8
Yellow “ALERT”
Flash Code 9
Open Run Circuit
Current only in start circuit
Welded Contactor
Compressor always runs
Low Voltage
Control circuit < 17VAC
1. Open circuit in compressor run wiring or connections
2. Compressor run winding is damaged
1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
1. Control circuit transformer is overloaded
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.
12 421 01 5100 01
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.
421 01 5100 01 13
International Comfort Products, LLC
Lewisburg, TN 37091
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