Goodman GSXC180361BA, GSXC180481BA, GSXC180241BA Installation Manual

CONDENSING UNIT

AIR CONDITIONING
INSTALLATION & SERVICE REFERENCE

I

MPORTANT SAFETY INSTRUCTIONS

© 2014, 2016-2018 Goodman Manufacturing Compan y , L.P.
5151 San Felipe, Suite 500, Houston, TX 77056
www.goodmanmfg.com -or- www.amana-hac.com
P/N: IO-449F Date: February 2018

S

HIPPING INSPECTION

The following symbols and labels are used throughout this manual
to indicate immediat e or potential safety haz ards. It is the owner’s
and installer’s responsibility to read and comply with all safety
information and instructions accompanying these symbols. Fail­ure to heed safety information increases the risk of personal in­jury, property damage, and/or product damage.

WARNING

HIGH VOLTAGE !

D

ISCONNECT

ULTIPLE POWER SOURCES MAY BE PRESENT

M

TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH

O

NLY PERSONNEL THAT HAVE BEEN TRAINED TO INSTALL, ADJUST, SERVICE OR
REPAIR (HEREINAFTER
MANUAL SHOULD SERVICE THE EQUIPMENT
BE RESPONSIBLE FOR ANY INJURY OR PROPERTY DAMAGE ARISING FROM
IMPROPER SERVICE OR SERVICE PROCEDURES
ASSUME RESPONSIBILITY FOR ANY INJURY OR PROPERTY DAMAGE WHICH MAY
RESULT
LICENSES TO SERVICE THE EQUIPMENT SPECIFIED IN THIS MANUAL, ONLY
LICENSED PERSONNEL SHOULD SERVICE THE EQUIPMENT
INSTALLATION, ADJUSTMENT, SERVICING OR REPAIR OF THE EQUIPMENT
SPECIFIED IN THIS MANUAL, OR ATTEMPTING TO INSTALL, ADJUST, SERVICE OR
REPAIR THE EQUIPMENT SPECIFIED IN THIS MANUAL WITHOUT PROPER
TRAINING MAY RESULT IN PRODUCT DAMAGE, PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH

ALL

POWER BEFORE SERVICING

.

. F

AILURE

.

, “

SERVICE

”)

THE EQUIPMENT SPECIFIED IN THIS

. THE

MANUFACTURER WILL NOT

. IF

YOU SERVICE THIS UNIT, YOU

. IN

ADDITION, IN JURISDICTIONS THAT REQUIRE ONE OR MORE

. I

.

CAUTION

MPROPER

Always keep the unit upright; laying the unit on its side or top may
cause equipment damage. Shipping damage, and subsequent in­vestigation is the responsibility of the carrier. Verify the model
number, specifications, electrical characteristics, and accessories
are correct prior to installation. The distributor or manufacturer
will not accept claims from dealers for transportation damage or
installation of incorrectly shipped units.

C

ODES

& R

EGULATIONS

This product is designed and manufactured to comply with na­tional codes. Installation in accordance with such codes and/or
prevailing local codes/regulations is the responsibility of the in­staller. The manufacturer assumes no responsibility for equip­ment installed in violation of any codes or regulations. Rated
performance is achieved after 72 hours of operation. Rated per­formance is delivered at the specified airflow. See outdoor unit
specification sheet for split system models or product specifica­tion sheet for packaged and light commercial models. Specifica­tion sheets can be found at www.goodmanmfg.com f or Goodman
brand products or www.amana-hac.com for Amana® brand prod­ucts. Within either website, please select the residential or com­mercial products menu and then select the submenu for the type
of product to be installed, such as air conditioners or heat pumps,
to access a list of product pages that each contain links to that
model’s specification sheet.

The United St at es Envir onment al Prot ection Agency (EPA) has is­sued various regulations regarding the introduction and disposal
of refrigerants. Failure to follow these regulations may harm the
environment and can lead to the imposition of substantial fines.

Should you have any questions please contact the local office of
the EPA.

®

S

CROLL EQUIPPE D UNITS SHOULD NEVER BE USED TO EVACUATE THE AIR
CONDITIONING SYSTEM
ELECTRICAL ARCING RESU LTIN G IN A DAMAGED OR FAILED
COMPRESSOR

.

. V

ACUUMS THIS LOW CAN CAUSE INTERNAL

“IMPORT ANT - This pr oduct has been designe d and manufacture d to meet ENERGY STAR®
criteria for energy efficiency when ma tched with appropriate c oil components. However,
proper refrigerant charge and proper air flow are critical to achieve rated capacity and
efficiency . Inst allation of this product should f ollow the manufacturer’ s refrig erant charging
and air flow instructions. Failure to confirm proper charge and air flow may reduce energy
efficiency and shorten equipment life.”

is a registered trademark of Maytag Corporation or its related companies and is used under

license to Goodman Company, L.P., Houston, TX. All rights reserved.

If replacing a condensing unit or air handler, the system must be
manufacturer approved and Air Conditioning, Heating and Refrig­eration Institute (AHRI) matched. NOTE: Installation of unmatched
systems is strongly discouraged.

Minimum Airflow Clearance

Model Type A B C AA

Residential

Light Commercial

10" 10" 18" 20"
12" 12" 18" 24"

Outdoor units are approved for operation above 55°F in cooling
mode. Operation below 55°F requires the use of an approved low
ambient kit.

Damage to the unit caused by operating the unit in a structure that
is not complete (either as part of new construction or renovation)
is not covered by the warranty.

F

EA TURES

This air conditioner is a part of the ComfortNet™ family of prod­ucts. It may be installed as part of a “legacy” system using a
standard 24 VAC thermostat. However, with the CTK0*
ComfortNet thermostat kit, this air conditioner may be installed
as part of a digitally communicating system. The ComfortNet
system provides enhanced setup features, and enhanced diag­nostics. It also reduces the number of thermostat wires to a maxi­mum of four and a minimum of two.

I

NST ALLATION CLEARANCES

Special consideration must be given to location of the condensing
unit(s) in regard to structures, obstructions, other units, and any/
all other factors that may interfere with air circulation. Where
possible, the top of the unit should be completely unobstructed;
however, if vertical conditions require placement beneath an ob­struction there should be a minimum of 60 inches between the
top of the unit and the obstruction(s). The specified dimensions
meet requirements for air circulation only. Consult all appropri­ate regulatory codes prior to determining final clearances.

Another important consideration in selecting a location for the
unit(s) is the angle to obstructions. Either side adjacent the valves
can be placed toward the structure provided the side away from
the structure maintains minimum service clearance. Corner in­stallations are strongly discouraged.

NOT

RECOMMENDED

B B B

AA AAA

C

AA

A

AA

AA

C

AA

CC

B

AA

OK!

OK!

OK!

OK!

OK!

OK!

This unit can be located at ground floor level or on flat roofs. At
ground floor level, the unit must be on a solid, level foundation
that will not shift or settle. To reduce the possibility of sound
transmission, the foundation slab should not be in contact with
or be an integral part of the building foundation. Ensure the foun­dation is sufficient to support the unit. A concrete slab raised
above ground level provides a suitable base.

R

OOFTOP INSTALLATIONS

If it is necessary to install this unit on a roof structure, ensure
the roof structure can support the weight and that proper con­sideration is given to the weather-tight integrity of the roof . Since
the unit can vibrate during operation, sound vibration transmis­sion should be considered when installing the unit. Vibration ab­sorbing pads or springs can be installed between the condensing
unit legs or frame and the roof mounting assembly to reduce
noise vibration.

S

AFE REFRIGERANT HANDLING

While these items will not cover every conceivable situation, they
should serve as a useful guide.

WARNING

TO

AVOID POSSIBLE INJURY, EXPLOSION OR DEATH, PRACTICE SAFE

HANDLING OF REFRIGERANTS

.

WARNING

R

EFRIGERANTS ARE HEAVIER THAN AIR
OXYGEN IN YOUR LUNGS OR IN ANY ENCLOSED SPACE
POSSIBLE DIFFICULTY IN BREATHING OR DEATH

EVER PURGE REFRIGERANT INTO AN ENCLOSED ROOM OR SPACE

• N

LAW, ALL REFRIGERANTS MUST BE RECLAIMED

F AN INDOOR LEAK IS SUSPECTED, THOROUGHLY VENTILATE THE AREA

• I

BEFORE BEGINNING WORK

IQUID REFRIGERANT CAN BE VERY COLD

• L

OR BLINDNESS, AVOID CONTACT AND WEAR GLOVES AND GOGGLES

LIQUID REFRIGERANT DOES CONTACT YOUR SKIN OR EYES, SEEK MEDICAL

HELP IMMEDIATELY

LWAYS FOLLOW

• A

OISONOUS GAS WILL BE PRODUCED

P

EP A

.

.

REGULATIONS

. T

HEY CAN “PUSH OUT” THE

. TO

AVOID

:

.

. TO

AVOID POSSIBLE FROSTBITE

. N

EVER BURN REFRIGERANT, AS

.

. BY

. IF

WARNING

TO

AVOID POSSIBLE EXPLOSION, USE ONLY RETU RNABLE (NOT
DISPOSABLE) SERVICE CYLINDERS WHEN REMOVING REFRIGERANT FROM
A SYSTEM

• E

• E

• E
W

.

NSURE THE CYLINDER IS FREE OF DAMAGE WHICH COUL D LEAD TO A

LEAK OR EXPLOSION

NSURE THE HYDROSTATI C TEST DATE DOES NOT EXCEED
NSURE THE PRESSURE RATING MEETS OR EXCEEDS

HEN IN DOUBT, DO NOT USE CYLINDER

.

400

.

5

PSIG

YEARS

.

.

2

WARN ING

TO

AVOID POSSIBLE EXPLOSION
EVER APPLY FLAME OR STEAM TO A REFRIGERANT CYLINDER

• N

MUST HEAT A CYLINDER FOR FASTER CHARGING, PARTIALLY IMMERSE IT
IN WARM WATER

EVER FILL A CYLINDER MORE THAN

• N

EVER ADD ANYTHING OTHER THAN

• N
410A

TO AN

BE LISTED OR CERTIFIED FOR THE TYPE OF REFRIG ERANT USED

TORE CYLINDERS IN A COOL, DRY PLACE

• S

LATFORM OR A ROLLER

P

R

EFRIGERANT LINES

.

R-410A

CYLINDER

.

:

80%

FULL OF LIQUID REFRIG ERANT

R-22 TO AN R-22

. THE

SERVICE EQUIPM EN T USED MUST

. N

EVER USE A CYLINDER AS A

. IF

YOU

CYLINDER OR

.

.

R-

CAUTION

THE

COMPRESSOR
SUSCEPTIBLE TO MOISTURE ABSORPTION AND COUL D CAUSE
COMPRESSOR FAILURE
ANY LONGER THAN NECESSARY FOR INSTALLATION

POE

. DO

OIL FOR

R-410A

UNITS IS EXTREMELY

NOT LEAVE SYSTEM OPEN TO ATMOSPHERE

.

Use only refrigerant grade (dehydrated and sealed) copper tub­ing to connect the condensing unit with the indoor evaporator.
After cutting the tubing, install plugs to keep refrigerant tubing
clean and dry prior to and during installation. Tubing should
always be cut square keeping ends round and free from burrs.
Clean the tubing to prevent contamination.

Do NOT let refrigerant lines come in direct contact with plumb­ing, ductwork, floor joists, wall studs, floors, and walls. When
running refrigerant lines through a foundation or wall, openings
should allow for sound and vibration absorbing material to be
placed or installed between tubing and foundation. Any gap be­tween foundation or wall and refrigerant lines should be filled
with a pliable silicon-based caulk, RTV or a vibration damping
material. Avoid suspending refrigerant tubing from joists and
studs with rigid wire or straps that would come in contact with
the tubing. Use an insulated or suspension type hanger. Keep
both lines separate and always insulate the suction line.

These sizes are suitable for line lengths of 79 feet or less. If a run
of more than 79, refer to TP-107 Long Line Set Application Guide­line or contact your distributor for assistance.

Insulation is necessary to prevent condensation from forming
and dropping from the suction line. Armflex (or satisfactory
equivalent) with 3/8” min. wall thickness is recommended. In
severe conditions (hot, high humidity areas) 1/2” insulation may
be required. Insulation must be installed in a manner which pro­tects tubing from damage and contamination.

Where possible, drain as much residual compressor oil from ex­isting systems, lines, and traps; pay close attention to low areas
where oil may collect. NOTE: If changing refrigerant types, en­sure the indoor coil and metering device is compatible with the
type of refrigerant being used; otherwise, the indoor coil must be
replaced.

RECOMMENDED IN TERCONNE CTING TUBING (Ft )

Cond

Unit

Tons Suct Liq Suct Liq Suct Liq

0-24 25-49 50-79*

Lin e Diameter (In. OD)

1 1/2 5/8 1/4 3/4 3/8 3/4 3/8

2 5/8 1/4 3/4 3/8 3/4 3/8

2 1/2 5/8 1/4 3/4 3/8 7/8 3/8

3 3/4 3/8 7/8 3/8 1 1/8 3/8

3 1/2 7/8 3/8 1 1/8 3/8 1 1/8 3/8

4 7/8 3/8 1 1/8 3/8 1 1/8 3/8
5 7/8 3/8 1 1/8 3/8 1 1/8 3/8

* Lines great er than 79 feet in l engt h refer to TP-107 Long Line Set

Application Gui deline or contact your distributor for assi stance.
NOTE: The maximum vertic al difference between the outdoor unit and

indoor unit is 25 feet for two s tage units .

B

URYING REFRIGERANT LINES

If burying refrigerant lines can not be avoided, use the following
checklist.

1. Insulate liquid and suction lines separately.

2. Enclose all underground portions of the refrigerant lines
in waterproof material (conduit or pipe) sealing the ends
where tubing enters/exits the enclosure.

3. If the lines must pass under or through a concrete slab,
ensure lines are adequately protected and sealed.

3

R

EFRIGERANT LINE CONNECTIONS

IMPORTANT

To avoid overheating the service valve, TXV valve, or filter drier
while brazing, wrap the component with a wet rag, or use a
thermal heat trap compound. Be sure to follow the
manufacturer’s instruction when using the heat trap compound.
Note: Remove Schrader valves from service valves before brazing
tubes to the valves. Use a brazing alloy of 2% minimum silver
content. Do not use flux.

Torch heat required to braze tubes of various sizes is
proportional to the size of the tube. T ube s of smaller size requir e
less heat to bring the tube to brazing temperature before adding
brazing alloy. Applying too much heat to any tube can melt the
tube. Service personnel must use the appropriate heat level
for the size of the tube being brazed. NOTE: The use of a heat
shield when brazing is recommended to avoid burning the serial
plate or the finish on the unit.

1. The ends of the refrigerant lines must be cut square,
deburred, cleaned, and be round and free from nicks or
dents. Any other condition increases the chance of a
refrigerant leak.

2. “Sweep” the refrigerant line with nitrogen or inert gas
during brazing to prevent the formation of copper-oxide
inside the refrigerant lines. The POE oils used in R-410A
applications will clean any copper-oxide present from the
inside of the refrigerant lines and spread it throughout
the system. This may cause a blockage or failure of the
metering device.

3. After brazing, quench the joints with water or a wet cloth
to prevent overheating of the service valve.

4. Ensure the filter drier paint finish is intact after brazing. If
the paint of the steel filter drier has been burned or
chipped, repaint or treat with a rust preventative. This is
especially important on suction line filter driers which are
continually wet when the unit is operating.

NOTE: Be careful not to kink or dent refrigerant lines. Kinked or
dented lines will cause poor performance or compressor damage.

Do NOT make final refrigerant line connection until plugs are
removed from refrigerant tubing.

NOTE: Before brazing, verify indoor piston size by checking the
piston kit chart packaged with indoor unit.

L

EAK TESTING

TO

AVOID THE RISK OF FIRE OR EXPLOSION, NEVER USE OXYGEN, HIGH
PRESSURE AIR OR FLAMMABLE GASES FOR LEAK TESTING OF A
REFRIGERATION SYSTEM

(N

ITROGEN OR NITROGEN-TRACED

WARNING

.

)

WARNING

TO

AVOID POSSIBLE EXPLOSION, THE LINE FROM THE NITROGEN
CYLINDER MUST INCLUDE A PRESSURE REGULATOR AND A PRESSURE
RELIEF VALVE
NO MORE THAN

. THE

PRESSURE RELIEF VALVE MUST BE SET TO OPEN AT

150

PSIG

.

Pressure test the system using dry nitrogen and soapy water to
locate leaks. If you wish to use a leak detector, charge the sys­tem to 10 psi using the appropriate refrigerant then use nitro­gen to finish charging the system to working pressure then ap­ply the detector to suspect areas. If leaks are found, repair them.
After repair, repeat the pressure test. If no leaks exist, proceed to
system evacuation.

S

YSTEM EVACUATION

Condensing unit liquid and suction valves are closed to contain
the charge within the unit. The unit is shipped with the valve
stems closed and caps installed. Do not open valves until the

system is evacuated.

WARNING

REFRIGERANT UNDER PRESSURE!

F

AILURE TO FOLLOW PROPER PROCEDURES MAY CAUSE PROPERTY

DAMAGE, PERSONAL INJURY OR DEATH

.

NOTE: Scroll compressors should never be used to evacuate or

pump down a heat pump or air conditioning system.

CAUTION

P

ROLONGED OPERATION AT SUCTION PRESSURES LESS THAN
FOR MORE THAN
SCROLLS AND PERMANENT DAMAGE TO THE SCROLL TIPS, DRIVE
BEARINGS AND INTERNAL SEAL

5

SECONDS WILL RESU LT IN OVERHEAT ING OF THE

.

1. Connect the vacuum pump with 250 micron capability to
the service valves.

2. Evacuate the system to 250 microns or less using suction
and liquid service valves. Using both valves is necessary
as some compressors create a mechanical seal separating
the sides of the system.

3. Close pump valve and hold vacuum for 10 minutes.
Typically pressure will rise during this period.

• If the pressure rises to 1000 microns or less and remains
steady the system is considered leak-free; proceed to
startup.

• If pressure rises above 1000 microns but holds steady
below 2000 microns, moisture and/or noncondensibles
may be present or the system may have a small leak.
Return to step 2: If the same result is encountered check
for leaks as previously indicated and repair as necessary
then repeat evacuation.

• If pressure rises above 2000 microns, a leak is present.
Check for leaks as previously indicated and repair as
necessary then repeat evacuation.

20

PSIG

4

5000

A

4500
4000
3500

MICRONS

3000

IN

2500

ACUUM

2000

V

1500
1000

500

0 1 2 3 4 5 6 7 8 9

E

LECTRICAL CONNECTIONS

CONDENSIBLES OR SMALL
LEAK PRESENT

NO LEAKS
NO CONDENSIBLES

MINUTES

WARN ING

HIGH VOLTAGE!

D

ISCONNECT

M

ULTIPLE POWER SOURCES MAY BE PRESENT
TO DO SO MAY CAUSE PROPERTY DAMAGE, PERSONAL
INJURY OR DEATH DUE TO ELECTRIC SHOCK
MUST CONFO RM WITH
CODES
EQUIPM EN T PERFORMANCE, EQUIPM EN T DAMAGE OR
FIRE

.

ALL

POWER BEFORE SERVICING

NEC OR CEC

. U

NDERSIZED WIRES COUL D CAUSE POOR

AND ALL LOCAL

. W

.

. F

IRING

AILURE

LEAK(S)
PRESENT

These devices have sufficient time delay to permit the motor­compressor to start and accelerate its load.

H

IGH VOLTAGE CONNECTIONS

Route power supply and ground wires through the high voltage
port and terminate in accordance with the wiring diagram pro­vided inside the control panel cover.

LOW V

OLTAGE CONNECTIONS

Condensing unit control wiring requires a nominal 24 VAC (+/- 6
VAC), 60 Hz, minimum 25 VA service from either the indoor or
optional outdoor transformer. Low voltage wiring for the con­densing units depends on the thermostat used. The unit is de-

10

signed to work as part of a fully communicating HVAC system
utilizing the ComfortNet™, CTK0* thermostat, ComfortNet compat­ible indoor unit, and up to four wires. The unit also has legacy 24
VAC inputs to support non-communicating systems. Route con­trol wires through the low voltage port and terminate in accor­dance with the wiring diagram provided inside the control panel
cover.

HIGH
VOLTAGE
PORT

WARN ING

TO

AVOID THE RISK OF FIRE OR EQUIPMEN T DAMAGE, USE COPPER

CONDUCTORS

.

NOTICE

U

NITS WITH RECIPROCATING COMPRESSORS AND NON-BLEED

REQUIRE A HARD START KIT

.

The condensing unit rating plate lists pertinent electrical data
necessary for proper electrical service and overcurrent protec­tion. Wires should be sized to limit voltage drop to 2% (max.)
from the main breaker or fuse panel to the condensing unit.
Consult the NEC, CEC, and all local codes to determine the cor­rect wire gauge and length.

Local codes often require a disconnect switch located near the
unit; do not install the switch on the unit. Refer to the installa­tion instructions supplied with the indoor furnace/air handler
for specific wiring connections and indoor unit configuration.
Likewise, consult the instructions packaged with the thermostat
for mounting and location information.

O

VERCURRENT PROTECTION

The following overcurrent protection devices are approved for
use.

• Time delay fuses

• HACR type circuit breakers

TXV’S

LOW
VOLTAGE
PORT

Voltage Ports

NOTE: If the condensing unit is wired in the communicating mode

together with the compatible communicating indoor unit and
thermostat, then the communicating thermostat is able to search
and identify the condensing unit when power is applied to the
system. Refer to the Installation Manual of the communicating
thermostat for more information.

Thermostat

Y2

Y2

Y2

OD UNIT

Two-Stage Non-Communicating Thermostat
Low Voltage Wire Connection (legacy mode)

Two-Stage Heating

with

Two-Sta g e Co oling

FURNACE OR

IR HANDLER

5

S

YSTEM START UP

C

HARGE VERIFICATION

CAUTION

POSSIBLE REFRIGERANT LEAK!

TO

AVOID A POSSIBLE REFRIG ERANT LEAK, OPEN THE SERVICE VALVES

UNTIL THE TOP OF THE STEM IS

1/8”

FROM THE RETAINER

.

NOTE: Power must be supplied to the 18 SEER outdoor units

containing ECM motors before the power is applied to the in­door unit. Sending a low voltage signal without high voltage
power present at the outdoor unit can cause malfunction of the
control module on the ECM motor.

Adequate refrigerant charge for the matching HSVTC evapora­tor coil and 15 feet of lineset is supplied with the condensing
unit. If using evaporator coils other than HSVTC coil it maybe
necessary to add or remove refrigerant to attain proper charge.
If line set exceeds 15 feet in length, refrigerant should be added
at .6 ounces per foot of liquid line.

NOTE: Charge should always be checked using superheat
when using a piston and subcooling when using TXV equipped
indoor coil to verify proper charge.

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.

When opening valves with retainers, open each valve only until
the top of the stem is 1/8” from the retainer. To avoid loss of
refrigerant, DO NO T apply pre ssure to the r etainer. When opening
valves without a retainer remove service valve cap and insert a
hex wrench into the valve stem and back out the stem by turning
the hex wrench counterclockwise. Open the valve until it contacts
the rolled lip of the valve body.

NOTE: These are not back-seating valves. It is not necessary to
force the stem tightly against the rolled lip.

WARNING

REFRIGERANT UNDER PRESSURE!

• DO

NOT OVERCHARGE SYSTEM WITH REFRIG ERANT

O NOT OPERATE UNIT IN A VACUUM OR AT NEGATIVE PRESSURE

• D

AILURE TO FOLLOW PROPER PROCEDURES MAY CAUSE PROPERTY

F

DAMAGE, PERSONAL INJURY OR DEATH

.

.

.

CAUTION

USE

REFRIG ERANT CERTIFIED TO
MAY CAUSE COMPRESSOR DAMAGE, AND
WARRANTY
REFRIG ERANT TO MEET

. M

OST PORTABLE MACHINES CANNOT CLEAN USED

AHRI

AHRI

STANDARDS

STANDARDS

. U

SED REFRIG ERANT

IS NOT COVERED UNDER

THE

.

NOTICE

V

IOLATION OF

PENALTIES

DAMAGE TO THE UNIT CAUSED BY OPERATING THE COMPRESSOR
WITH THE SUCTION VALVE CLOSED IS NOT COVERED UNDER THE
WARRANTY AND MAY CAUSE SERIOUS COMPRESSOR DAMAGE

F

INAL CHARGE ADJUSTMENT

The outdoor temperature must be 60°F or higher. Set the room
thermostat to COOL, fan switch to AUTO, and set the tempera­ture control well below room temperature.

After system has stabilized per startup instructions, check sub­cooling and superheat as detailed in the following section.

EPA

REGULATIONS MAY RESU LT IN FINES OR OTHER

.

CAUTION

.

After the refrigerant charge has bled into the system, open the
liquid service valve. The service valve cap is the secondary seal
for the valves 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 1/6 of a turn (1 wrench flat) to properly sea t the
sealing surfaces.

Do not introduce liquid refrigerant from the cylinder into the
crankcase of the compre ssor as this may damage the compre ssor .

1. Break vacuum by fully opening liquid and suction base
valves.

2. Set thermostat to call for cooling. Check indoor and
outdoor fan operation and allow system to stabilize for 10
minutes for fixed orifices and 20 minutes for expansion
valves.

CAUTION

TO

PREVENT PERSONAL INJURY, CAREFULLY CONNECT AND DISCONNECT
MANIFOLD GAUGE HOSES
BURNS

. DO

NOT VENT REFRIG ERANT INTO THE ATMOSPHERE
ALL REFRIG ERANT DURING SYSTEM REPAIR AND BEFORE FINAL UNIT
DISPOSAL

E

XPANSION VALVE SYSTEM

.

. E

SCAPING LIQUID REFRIGERANT CAN CAUSE

. R

ECOVER

NOTE: Units matched with indoor coils equipped with non-ad­justable TXV should be charged by subcooling only.

Run the remote on low stage cooling for 10 minutes until refriger­ant pressures stabilize. Use the following guidelines and methods
to check unit operation and ensure that the refrigerant charge is
within limits. Charge the unit on low stage.

6

1. Purge gauge lines. Connect service gauge manifold to base­valve service ports.

2. Temporarily install a thermometer on the liquid line at the
liquid line service valve and 4-6" from the compressor on
the suction line. Ensure the thermometer makes adequate
contact and is insulated for best possible readings. Use
liquid line temperature to determine sub-cooling and vapor
temperature to determine superheat.

3. Check subcooling and superheat. Systems with TXV
application should have a subcooling of 6°F +/- 1°F and
superheat of 8°F +/- 1°F.

a. If subcooling and superheat are low, adjust TXV to

8°F +/- 1°F to 9 ºF superheat, then check subcooling.
NOTE: To adjust superheat, turn the valve stem clock-

wise to increase and counter clockwise to decrease.

b. If subcooling is low and superheat is high, add charge

to raise subcooling to 6°F +/- 1°F then check superheat.

c. If subcooling and superheat are high, adjust TXV valve

to 8°F +/- 1°F superheat, then check subcooling.

d. If subcooling is high and superheat is low, adjust TXV

valve to 8°F +/- 1°F superheat and remove charge to
lower the subcooling to 6°F +/- 1°F.

NOTE: Do NOT adjust the charge based on suction
pressure unless there is a gross undercharge.

4. Disconnect manifold set, installation is complete.

NOTE: Check the Schrader ports for leaks and tighten valve cores
if necessary. Install caps finger-tight.

SUPERHEAT FORMULA =

SUCT. LINE TEMP. - SAT. SUCT. TEMP.

SAT URATED SUCTION PRESSURE

TEMPERATURE CHART

SUCTION

PRESSUR E

PS I G R-22 R-410A

50 26 1
52 28 3
54 29 4
56 31 6
58 32 7
60 34 8
62 35 10
64 37 11
66 38 13
68 40 14
70 41 15
72 42 16
74 44 17
76 45 19
78 46 20
80 48 21

85 50 24
90 53 26

95 56 29
100 59 31
110 64 36
120 69 41
130 73 45
140 78 49
150 83 53
160 86 56
170 90 60

SATURATED SUCTION

TEMPERATURE ºF

SATURATED LIQUID PRESSURE

TEMPERA TURE CHART

LIQUID PRESSURE

PSIG R-22 R-410A

200 101 70
210 105 73
220 108 76
225 110 78
235 113 80
245 116 83
255 119 85
265 121 88
275 124 90
285 127 92
295 130 95
305 133 97
325 137 101
355 144 108
375 148 112
405 155 118
415 157 119
425 n/a 121
435 n/a 123
445 n/a 125
475 n/a 130
500 n/a 134
525 n/a 138
550 n/a 142
575 n/a 145
600 n/a 149
625 n/a 152

SATURATED LIQUID

TEMPERATURE ºF

7

ADDITIONAL NOTES:

1. There are (3) 7-segment LED displays on the PCB. See the
Troubleshooting Tables at the end of this manual fo r
definitions of the LED status.

2. When system is at Standby mode, press “TEST” push button
to turn on both compressor and outdoor fan for five (5)
seconds.

3. Press “RECALL” push-button t o retrie ve the six most r ecent
faults. The control must be in Standby Mode (no
thermostat inputs) to use the feature. Depress the push­button for approximately two seconds and less than five
seconds. The (3) 7-segment LED displays will then display
the six most recent faults beginning with the most recent
fault and decrementing to the least recent fault. The faults
may be cleared by depressing the button for greater than
five seconds. Consecutively repeated faults are displayed
a maximum of three times. Refer to the fault code
definitions at the end of this manual for more details.

4. “TERM” dipswitch is used for communications bus
configuration. Leave the settings to the factory default
position.

5. “LEARN” push button is used to reset the communications

between the equipment. Used only for troubleshooting
purposes.

C

OMFORTNET

™ S

YSTEM

OVERVIEW

The ComfortNet system (or CT system) is a system that includes a
ComfortNet compatible air handler/furnace/modular blower and
air conditioner or heat pump with a CTK0* thermostat. Any other
system configurations are considered invalid ComfortNet systems
and must be connected as a tradition (or legacy) system. The
table below compares the valid CT systems.

two-way digital communications between the thermostat and
subsystems (indoor/outdoor unit) and between subsystems is
the key to unlocking the benefits and features of the ComfortNet
system.

Two-way digital communications is accomplished using only two
wires. The thermostat and subsystem controls are powered with
24 VAC Thus, a maximum of 4 wires between the equipment
and thermostat is all that is required to operate the system.

AIRFLOW CONSIDERATIONS

Airflow demands are managed differently in a fully communicat­ing system than they are in a legacy wired system. The system
operating mode (as determined by the thermostat) determines
which unit calculates the system airflow demand. If the indoor
unit is responsible for determining the airflow demand, it calcu­lates the demand and sends it to the ECM motor. If the outdoor
unit or thermostat is responsible for determining the demand, it
calculates the demand and transmits the demand along with a
fan request to the indoor unit. The indoor unit then sends the
demand to the ECM motor. The following table lists the various
ComfortNet™ systems, the operating mode, and airflow demand
source.

System

Air Conditione r +

Air Handler

Air Conditione r +

Furnace

System

Operating Mod e

Cooling Air Conditioner

Heating Air Handler

Continuous Fan Thermostat

Cooling Air Conditioner

Heating Furnace

Airflow Dem and

Sou rce

CT com patible

Air Handler/Furnace/Modular

Blower

CT com patible

Air Handler/Furnace/Modular

Blower

CT compatible

Air Conditioner

CT compatible

Heat Pump

Full CT system

benefits & features

Full CT system

benefits & features

A ComfortNet heating/air conditioning system differs from a
legacy/traditional system in the manner in which the indoor unit,
outdoor unit and thermostat interact with one another. In a tra­ditional system, the thermostat sends commands to the indoor
and outdoor units via analog 24 VAC signals. It is a one-way
communication path in that the indoor and outdoor units typi­cally do not return information to the thermostat.

On the other hand, the indoor unit, outdoor unit, and thermostat
comprising a ComfortNet system “communicate” digitally with
one another. It is now a two-way communications path. The
thermostat still sends commands to the indoor and outdoor units.
However, the thermostat may also request and receive informa­tion from both the indoor and outdoor units. This information
may be displayed on the CT thermostat. The indoor and outdoor
units also interact with one another. The outdoor unit may send
commands to or request information from the indoor unit. This

Continuous Fan Thermostat

For example, assume the system is an air conditioner matched
with an air handler. With a call for low stage cooling, the air
conditioner will calculate the system’s low stage cooling airflow
demand. The air conditioner will then send a fan request along
with the low stage cooling airflow demand to the air handler.
Once received, the air handler will send the low stage cooling
airflow demand to the ECM motor. The ECM motor then delivers
the low stage cooling airflow. The table below lists the nominal
high and low stage airflow for the ComfortNet heat pumps.

Model

*SXC160241
*SXC160361
*SXC160481
*SXC160601

*SXC180241
*SXC180361
*SXC180481
*SXC180601

High Low

800 600
1200 800
1550 1100
1800 1400

800 600
1250 850
1550 1070
1750 1210

8