Trane 4TWR6 User manual

18-AC104D1-1G-EN
ALL phases of this installation must comply with NATIONAL, STATE AND LOCAL CODES
IMPORTANT – This Document is customer property and is to remain with this unit. Please return to service informa-
tion pack upon completion of work.
These instructions do not cover all variations in systems or provide for every possible contingency to be met in connection with
the installation. Should further information be desired or should particular problems arise which are not covered sufficiently for the
purchaser’s purposes, the matter should be referred to your installing dealer or local distributor.
Note: The manufacturer recommends installing only approved matched indoor and outdoor systems. All of the manufacture’s split
systems are A.H.R.I. rated only with TXV/EEV indoor systems. Some of the benefits of installing approved matched indoor and
outdoor split systems are maximum efficiency, optimum performance and the best overall system reliability.
Table of Contents
Section 1. Safety..................................................................................... 2
Section 2. Unit Location Considerations ............................................. 3
Section 3. Unit Preparation.................................................................... 4
Section 4. Setting the Unit..................................................................... 4
Section 5. Refrigerant Line Considerations......................................... 4
Section 6. Refrigerant Line Routing ..................................................... 5
Section 7. Refrigerant Line Brazing...................................................... 7
Section 8. Refrigerant Line Leak Check............................................... 7
Section 9. Evacuation ............................................................................ 8
Section 10. Service Valves .................................................................... 8
Section 11. Electrical - Low Voltage ..................................................... 9
Section 12. Electrical - High Voltage .................................................. 10
Section 13. Start Up.............................................................................. 10
Section 14. System Charge Adjustment............................................. 10
Section 15. Checkout Procedures ...................................................... 14
Section 16. Defrost Control ................................................................. 15
Section 17. Troubleshooting ............................................................... 20
Section 18. Wiring Diagrams............................................................... 22
Section 19. Pressure Curves............................................................... 25
Section 20. Refrigerant Circuit (only for reference) .......................... 28
Heat Pumps
4TWR6
Installation and Operation Manual

2 18-AC104D1-1G-EN
Section 1. Safety
This information is intended for use by individuals
possessing adequate backgrounds of electrical and
mechanical experience. Any attempt to repair a central
air conditioning product may result in personal injury
and/or property damage. The manufacture or seller
cannot be responsible for the interpretation of this
information, nor can it assume any liability in connec-
tion with its use.
These units use R-410A refrigerant which operates
at 50 to 70% higher pressures than R-22. Use only
R-410A approved service equipment. Refrigerant cyl-
inders are painted a “Rose” color to indicate the type
of refrigerant and may contain a “dip” tube to allow
for charging of liquid refrigerant into the system. All
R-410A systems use a POE oil that readily absorbs
moisture from the atmosphere. To limit this “hygro-
scopic” action, the system should remain sealed
whenever possible. If a system has been open to the
atmosphere for more than 4 hours, the compressor oil
must be replaced. Never break a vacuum with air and
always change the driers when opening the system
for component replacement. For specific handling
concerns with R-410A and POE oil reference Retrofit
Bulletins SS-APG006-EN and APP-APG011-EN.
Extreme caution should be exercised when opening
the Liquid Line Service Valve. Turn counterclockwise
until the valve stem just touches the rolled edge. No
torque is required. Failure to follow this warning will
result in abrupt release of system charge and may
result in personal injury and /or property damage.
UNIT CONTAINS R-410A REFRIGERANT!
R-410A operating pressures exceed the limit of R-22.
Proper service equipment is required. Failure to use
proper service tools may result in equipment damage
or personal injury.
SERVICE
USE ONLY R-410A REFRIGERANT AND
APPROVED POE COMPRESSOR OIL.
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and trouble-
shooting of this product, it may be necessary to work
with live electrical components. Failure to follow all
electrical safety precautions when exposed to live
electrical components could result in death or serious
injury.
If using existing refrigerant lines make certain that all
joints are brazed, not soldered.
Scroll compressor dome temperatures may be hot. Do
not touch the top of compressor; it may cause minor to
severe burning.
WARNING
!
WARNING
!
WARNING
!
WARNING
!
WARNING
!
CAUTION
!
CAUTION
!
HOT SURFACE!
May cause minor to severe burning. Failure to follow
this Caution could result in property damage or per-
sonal injury. Do not touch top of compressor.
CAUTION
!
CONTAINS REFRIGERANT!
Failure to follow proper procedures can result in
personal illness or injury or severe equipment
damage.
System contains oil and refrigerant under high pres-
sure. Recover refrigerant to relieve pressure before
opening system.
CAUTION
!
GROUNDING REQUIRED!
Failure to inspect or use proper service tools may
result in equipment damage or personal injury.
Reconnect all grounding devices. All parts of this
product that are capable of conducting electrical
current are grounded. If grounding wires, screws,
straps, clips, nuts, or washers used to complete a
path to ground are removed for service, they must be
returned to their original position and properly
fastened.
CAUTION
!
HAZARDOUS VOLTAGE!
Disconnect power and discharge capacitors before
servicing.
WARNING
!

18-AC104D1-1G-EN 3
D
H
W
Unit Dimensions and Weight
Models H x D x W (in) Weight* (lb)
4TWR6024N 41 x 34 x 37 236
4TWR6036N 45 x 34 x 37 257
4TWR6048N 45 x 34 x 37 292
4TWR6060N 45 x 34 x 37 293
* Weight values are estimated.
Section 2. Unit Location Considerations
2.1 Unit Dimensions and Weight
2.2 Refrigerant Piping Limits
Table 2.1
When mounting the outdoor unit on a roof, be sure the roof will support the unit’s weight.
Properly selected isolation is recommended to alleviate sound or vibration transmission to the building structure.
Standard
Line Set
150” Max
Line Length
50’’
Max
Vertical
Change
50’’
Max
Vertical
Change
Min. 12” to
Shrubber
y
Avoid Install
Near Bedrooms
Min 5’ Unrestricted
Access Panel
Min 3’
Unrestricted
2.3 Suggested Locations for Best Reliability
Ensure the top discharge area is unrestricted for
at least five (5) feet above the unit.
Three (3) feet clearance must be provided in
front of the control box (access panels) and any
other side requiring service.
Do not locate close to bedrooms as operational
sounds may be objectionable.
Avoid locations such as near windows where
condensation and freezing defrost vapor can
annoy a customer.
Position the outdoor unit a minimum of 12” from
any wall or surrounding shrubbery to ensure
adequate airflow.
Outdoor unit location must be far enough away
from any structure to prevent excess roof runoff
water or icicles from falling directly on the unit.
1. The maximum length of refrigerant lines from outdoor to indoor unit should NOT exceed 150 feet.
2. The maximum vertical change should not exceed fifty (50) feet.
3. Service valve connection diameters are shown in Table 5.1.
Note: For line lengths greater than fifty (50) feet, Refer to Refrigerant Piping Application Guide,
SS-APG006F-EN, or Refrigerant Piping Software Program.

4 18-AC104D1-1G-EN
2.4 Cold Climate Considerations
NOTE: It is recommended that these precautions be taken for units being installed in areas where snow accumula-
tion and prolonged below freezing temperatures occur.
• Units should be elevated 3-12 inches above the pad or rooftop, depending on local weather. This additional
height will allow drainage of snow and ice melted during defrost cycle prior to its refreezing. Ensure that drain
holes in unit base pan are not obstructed preventing draining of defrost water.
• If possible, avoid locations that are likely to accumulate snow drifts. If not possible, a snow drift barrier should be
installed around the unit to prevent a build-up of snow on the sides of the unit.
2.5 Coastal Considerations
If installed within one mile of salt water, including seacoasts and inland waterways, models without factory sup-
plied Seacoast Salt Shields require the addition of BAYSEAC001 (Seacoast Kit) at installation time.
STEP 2 - To remove the unit from the pallet, remove tabs by cutting with a sharp tool.
Section 3. Unit Preparation
3.1 Prepare The Unit For Installation
STEP 1 - Check for damage and report promptly to the carrier any damage found to the unit.
Section 4. Setting the Unit
4.1 Pad Installation
When installing the unit on a support pad, such as a concrete slab, consider the following:
• The pad should be at least 1” larger than the unit on all sides.
• The pad must be separate from any structure.
• The pad must be level.
• The pad should be high enough above grade to allow for drainage.
• The pad location must comply with National, State, and Local codes.
Line Sizes Service Valve Connection Sizes
Model Vapor
Line
Liquid
Line
Vapor Line
Connection
Liquid Line
Connection
4TWR6024N 5/8 3/8 3/4 3/8
4TWR6036N 3/4 3/8 3/4 3/8
4TWR6048N 7/8 3/8 7/8 3/8
4TWR6060N 1-1/8 3/8 7/8 3/8
Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes
Table 5.1
Alternate Line Sizes Line Sizes Service Valve Connection Sizes
Model Vapor
Line
Liquid
Line
Vapor Line
Connection
Liquid Line
Connection
4TWR6024N 3/4 3/8 3/4 3/8
4TWR6036N 5/8 3/8 3/4 3/8
7/8 3/8 3/4 3/8
4TWR6048N 3/4 3/8 7/8 3/8
4TWR6060N 3/4 3/8 7/8 3/8
7/8 3/8 7/8 3/8

18-AC104D1-1G-EN 5
Line Length
5.3 Required Refrigerant Line Length
5.2 Factory Charge
Determine required line length and lift. You will
need this later in STEP 2 of Section 14.
Total Line Length = __________ Ft.
Total Vertical Change (lift) = __________ Ft.
The outdoor condensing units are factory charged with the system charge required for the outdoor condensing
unit, ten (10) feet of tested connecting line, and the smallest rated indoor evaporative coil match. Always verify
proper system charge via subcooling (TXV/EEV) or superheat (fixed orifice) per the unit nameplate.
5.4 Refrigerant Line Insulation
Important: The Vapor Line must always be
insulated. DO NOT allow the Liquid Line and
Vapor Line to come in direct (metal to metal)
contact.
Vapor Line
Liquid Line
Insulation
5.5 Reuse Existing Refrigerant Lines
For retrofit applications, where the existing indoor evaporator coil and/or refrigerant lines will be used, the following
precautions should be taken:
• Ensure that the indoor evaporator coil and refrigerant lines are the correct size.
• Ensure that the refrigerant lines are free of leaks, acid, and oil.
CAUTION
!
If using existing refrigerant lines make certain that all joints are brazed, not soldered.
Section 6. Refrigerant Line Routing
6.1 Precautions
Important: Take precautions to prevent noise
within the building structure due to vibration
transmission from the refrigerant lines.
For Example:
• When the refrigerant lines have to be fastened to floor joists or other framing in a structure, use isolation type
hangers.
• Isolation hangers should also be used when refrigerant lines are run in stud spaces or enclosed ceilings.
• Where the refrigerant lines run through a wall or sill, they should be insulated and isolated.
• Isolate the lines from all ductwork.
• Minimize the number of 90º turns.
Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.

6 18-AC104D1-1G-EN
Isolation From Joist/Rafter
Side View
8 Feet Maximum
Secure Vapor line from joists using isolators every 8 ft. Secure
Liquid Line directly to Vapor line using tape, wire, or other appro-
priate method every 8 ft.
Joist/Rafter
Isolator
Line Set
8 Feet Maximum
Isolation In Wall Spaces
Side View
Wall
Isolator
Line Set
8 Feet Maximum
Secure Vapor Line using isolators every 8 ft. Secure Liquid Line
directly to Vapor Line using tape, wire, or other appropriate
method every 8 ft.
8 Feet Maximum
Isolation Through Wall DO NOT hang line sets from ductwork
Sealant
Insulation
Vapor Line
Wall
Ductwork
Isolator
Line Set

18-AC104D1-1G-EN 7
Section 7. Refrigerant Line Brazing
7.1 Braze The Refrigerant Lines
STEP 1 - Remove caps or plugs. Use a deburing tool to debur the pipe ends. Clean both internal and external
surfaces of the tubing using an emery cloth.
STEP 2 - Remove the pressure tap cap and valve cores from both service valves.
STEP 3 - Purge the refrigerant lines and indoor coil with dry nitrogen.
STEP 4 - Wrap a wet rag around the valve body to avoid heat damage and continue the dry nitrogen purge.
Braze the refrigerant lines to the service valves.
For units shipped with a field-installed external drier, check liquid line filter drier’s directional flow arrow to confirm
correct direction of refrigeration flow (away from outdoor unit and toward evaporator coil) as illustrated. Braze the
filter drier to the Liquid Line.
Continue the dry nitrogen purge. Do not remove the wet rag until all brazing is completed.
Important: Remove the wet rag before stopping the dry nitrogen purge.
Note: Install drier in Liquid Line.
NNOTE:OTE: Precautions should be taken to avoid heat damage to basepan during brazing. It is recommended to keepPrecautions should be taken to avoid heat damage to basepan during brazing. It is recommended to keep
the flame directly off of the basepan.the flame directly off of the basepan.
STEP 5 - Replace the pressure tap valve cores after the service valves have cooled.
3-4” from valve
STEP 1 STEP 2 STEP 3
STEP 4 STEP 5
Section 8. Refrigerant Line Leak Check
8.1 Check For Leaks
STEP 1 - Pressurize the refrigerant lines and evaporator coil to 150 PSIG using dry nitrogen.
STEP 2 - Check for leaks by using a soapy solution or bubbles at each brazed location. Remove nitrogren pressure
and repair any leaks before continuing.

8 18-AC104D1-1G-EN
Section 9. Evacuation
9.1 Evacuate the Refrigerant Lines and Indoor Coil
Important: Do not open the service valves until the refrigerant lines and indoor coil leak check and evacuation are
complete.
STEP 1 - Evacuate until the micron gauge reads no higher than 350 microns, then close off the valve to the
vacuum pump.
STEP 2 - Observe the micron gauge. Evacuation is complete if the micron gauge does not rise above 500 microns
in one (1) minute.
Once evacuation is complete blank off the vacuum pump and micron gauge, and close the valves on the manifold
gauge set.
Section 10. Service Valves
10.1 Open the Gas Service Valve
Important: Leak check and evacuation must be completed before opening the service valves.
NOTE: Do not vent refrigerant gases into the atmosphere.
STEP 1 - Remove valve stem cap.
STEP 2 - Using an adjustable wrench, turn valve stem 1/4 turn counterclockwise to the fully open position.
STEP 3 - Replace the valve stem cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
10.2 Open the Liquid Service Valve
Important: Leak check and evacuation must be completed before opening the service valves.
STEP 1 - Remove service valve cap.
STEP 2 - Fully insert 3/16” hex wrench into the stem and back out counterclockwise until valve stem just touches
the rolled edge (approximately five (5) turns.)
STEP 3 - Replace the valve cap to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
Extreme caution should be exercised when opening the Liquid Line Service Valve. Turn counterclockwise until
the valve stem just touches the rolled edge. No torque is required. Failure to follow this warning will result in
abrupt release of system charge and may result in personal injury and /or property damage.
WARNING
!
CAP
1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION
VALVE STEM
GAS LINE CONNECTION
UNIT SID
E
OF VALVE
PRESSURE TAP PORT
Cap
Rolled Edge to
Captivate Stem
Hex Headed
Valve System
Service Port
3/16” Hex Wrench
Unit Side
of Service
Valve
Gas Service Valve Liquid Service Valve

18-AC104D1-1G-EN 9
11.2 Low Voltage Hook-up Diagrams
Section 11. Electrical - Low Voltage
11.1 Low Voltage Maximum Wire Length
Table 11.1 defines the maximum total length of
low voltage wiring from the outdoor unit, to the
indoor unit, and to the thermostat.
Table 11.1
24 VOLTS
WIRE SIZE MAX. WIRE LENGTH
18 AWG 150 Ft.
16 AWG 225 Ft.
14 AWG 300 Ft.
With TEM 6/8
Thermostat Air Handler Outdoor
Unit
R
G
B
W1
W2
R
B
O
X2
R
G
B/C B/C
O
Y1
W
Blue
24 VAC HOT
FAN
24 VAC
Common
SOV
COOL/HEAT
1st STAGE
HEATING
2nd STAGE
EMERGENCY
HEAT Pink Black
White
X2
O
Y1
Y2
Y1
Y2
COOL/HEAT
2nd STAGE Y2
With TAM 7/9
Thermostat Air Handler Outdoor
Unit
R
G
B
W1
W2
R
B
O
YO
YO
X2
R
G
O
Yl
W
Blue
O
Y2
Yl
24 VAC HOT
FAN
24 VAC
Common
SOV
COOL/HEAT
1st STAGE
Y2 Y2
COOL/HEAT
2nd STAGE
HEATING
2nd STAGE
EMERGENCY
HEAT Pink Black
White
X2
•
Units with pigtails require wirenuts for connections.
•
In systems with multiple stages of electric heat, jumper W1 and W2 together if comfort control has only one stage of heat.
** TEM6 only - When using a BK enabled comfort control, cut BK jumper and bypass Y1 and Y2 at the air handle
r. Connect BK from
comfort control to BK of the air handle
r
•
TAM7 only - When using a BK enabled comfort control, cut BK jumper on the AFC and connect BK from comfort control to BK of
the air handler
. T AM7 DIP switches must be configured for “HP: 2-Stage/1 Compressor”.
Note: Refer to Indoor Unit Literature for proper configuration.
BK
WH/BLK
BK
WH/BLK
BK
WH/BLK
BK
WH/BLK
11.3 Defrost Control
Defrost controls have a selectable termination tem-
perature. As shipped, defrost will terminate at 47°F.
For a higher termination temperature, cut Jumper
J2 to achieve 70°F. Refer to the Defrost Control
section in this document for more information.
Pin Identification on J5 (See Illustration)
1. TEST_COMMON (Shorting to FRC_DFT
causes the control to initiate Forced Defrost.
Leaving this pin open results in the normal
mode of operation.)
2. FRC_DFT = Forced Defrost (Short TEST_
COMMON to this pin for two (2) seconds to
initiate a forced defrost. Remove the short
after defrost initiates.)
Defrost Control Checkout
Normal operation requires:
• Status LED on board flashing 1 time/second
in standby or 2 times/second with a call for
heating or cooling.
• 24V AC between R & B
• 24V AC between Y, Y0 & B with unit operating
• Defrost initiation when FRC_DFT pin is shorted to TEST_COMMON pin.
If a defrost control problem is suspected, refer to the service information in control box.
Defrost Board Detail
Jumper J2 J5 Test Pins

10 18-AC104D1-1G-EN
Section 12. Electrical - High Voltage
12.1 High Voltage Power Supply
The high voltage power supply must agree with
the equipment nameplate.
Power wiring must comply with national, state,
and local codes.
Follow instructions on unit wiring diagram located
on the inside of the control box cover and in this
document included with the unit.
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and
troubleshooting of this product, it may be nec-
essary to work with live electrical components.
Failure to follow all electrical safety precau-
tions when exposed to live electrical compo-
nents could result in death or serious injury.
WARNING
!
12.2 High Voltage Disconnect Switch
12.3 High Voltage Ground
Ground the outdoor unit per national, state, and local code requirements.
Install a separate disconnect switch at the outdoor unit.
For high voltage connections, flexible electrical conduit is recommended whenever vibration transmission may
create a noise problem within the structure.
Section 13. Start Up
13.1 System Start Up
STEP 1 - Ensure Sections 7 through 12 have been completed.
STEP 2 - Set System Thermostat to OFF.
STEP 3 - Turn on disconnect(s) to apply power to the indoor and outdoor units.
STEP 4 - Wait one (1) hour before starting the unit if compressor crankcase heater accessory is used and the
Outdoor Ambient is below 70ºF.
STEP 5 - Set system thermostat to ON.
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recommended method of charging above 55º F ambient outdoor tem-
perature. See Section 14.2.
For outdoor temperatures below 55º F, see Section 14.3.
Note: It is important to return in the spring or summer to accurately charge the system in the cooling mode when
outdoor ambient temperature is above 55º F.
For best results the indoor temperature should be kept between 70º F to 80º F.
Section 14. System Charge Adjustment
14.1 Temperature Measurements

18-AC104D1-1G-EN 11
STEP 1 - Use the refrigerant line total length
and lift measurements from Section 5.3.
Total Line Length = __________ Ft.
Vertical Change (Lift) = __________ Ft.
14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)
LIFT
Design Subcooling Value = __________º F
(from nameplate)
Subcooling Correction = __________º F
Final Subcooling Value = __________º F
STEP 2 - Determine the nal subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.
024N Models
50 1°
40
30
25 Use Design Subcooling
15
10
0
20 30 40 50 60 70 80 90 100 110 120130 140 150
Add 1°
Add 1°
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
Add 2°
REFRIGERANT LINE LIFT (FT)
048N Models
50 1°
40 1°
30
25 Use Design Subcooling
15
10
0
20 30 40 50 60 70 80 90 100 110 120130 140 150
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
Add 4°
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
Add 2°
Add 1°
Add 1°
060N Models
50 1°
40 1°
30
25 Use Design Subcooling
15
10
01°
20 30 40 50 60 70 80 90 100110 120130 140 150
Add 4°
Add 2°
Add 1°
Add 1°
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
036N Models
50 4°
40
30
25 Use Design Subcooling
15 1°
10
0
20 30 40 50 60 70 80 90 100 110 120130 140 150
Add 1°
Add 2°
REFRIGERANT LINE LIFT (FT)
SUBCOOL CHARGING CHART CORRECTIONS TABLE (FOR LINE LENGTH AND RISE)
TOTAL REFRIGERANT LINE LENGTH (FT) - [ includes lift ]
Add 1°
STEP 3 - Stabilize the system by operating for a minimum of 20 minutes.
At startup, or whenever charge is removed or added, the system must be operated for a minimum of 20 minutes to
stabilize before accurate measurements can be made.
STEP 4 - Measure the liquid line temperature and pressure at the outdoor unit’s service valve.
Measured Liquid Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
Final Subcooling Value = __________ º F
STEP 5 - Use the final subcooling value, refrigerant temperature and pressure from STEP 4, to determine the
proper liquid gage pressure using Table 14.2.
Example: Assume a 12º F Final Subcooling value and liquid temp of 90º F.
1. Locate 12º F Final Subcooling in Table 14.2.
2. Locate the Liquid Temperarature (90º F) in the left column.
3. The Liquid Gage Pressure should be approximately 327 PSIG. (This is the shown as the intersection of the
Final Subcooling column and the Liquid Temperature row in Table 14.2.)

12 18-AC104D1-1G-EN
Table 14.2
8910 11 12 13 14
179 182 185 188 191 195 198
195 198 201 204 208 211 215
211 215 218 222 225 229 232
229 232 236 240 243 247 251
247 251 255 259 263 267 271
267 271 275 279 283 287 291
287 291 296 300 304 309 313
309 313 318 322 327 331 336
331 336 341 346 351 355 360
355 360 365 370 376 381 386
381 386 391 396 402 407 413
407 413 418 424 429 435 441
435 441 446 452 458 464 470
464 470 476 482 488 495 501
495 501 507 514 520 527 533
R-410A REFRIGERANT CHARGING CHART
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125
LIQUID
TEMP
(°F)
FINAL SUBCOOLING (°F)
LIQUID GAGE PRESSURE (PSI)
From Dwg. D154557P01 Rev. 3
107 °F
STEP 6 - Adjust refrigerant level to attain proper gage pressure.
Add refrigerant if the Liquid Gage Pressure is lower than the chart value.
1. Connect gages to refrigerant bottle and unit as illustrated.
2. Purge all hoses.
3. Open bottle.
4. Stop adding refrigerant when liquid line temperature and Liquid Gage Pressure matches the charging chart
Final Subcooling value.
Recover refrigerant if the Liquid Gage Pressure is higher than the chart value.
STEP 7 - Stabilize the system.
1. Wait 20 minutes for the system condition to stabilize between adjustments.
Note: When the Liquid Line Temperature and Gage Pressure approximately match the chart, the system
is properly charged.
2. Remove gages.
3. Replace service port caps to prevent leaks. Tighten finger tight plus an additional 1/6 turn.
STEP 8 - Verify typical performance.
Refer to System Pressure Curves at the end of this document to verify typical performance.
(Example only)
PRESSURE CURVES FOR 4TWX5049E1
4TEE3F49C1 4TEE3F49C1
Cooling @ 1450 SCFM Heating @ 1350 SCFM
DISCHARGE PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
SUCTION PRESSURE (PSIG)
OUTDOOR TEMPERATURE (Degree F)
COOLING PERFORMANCE CAN BE CHECKED WHEN THE OUTDOOR TEMP IS ABOVE 65 DEG F.
TO CHECK COOLING PERFORMANCE, SELECT THE PROPER INDOOR CFM, ALLOW PRESSURES TO STABILIZE. MEASURE INDOOR WET BULB
TEMPERATURE, OUTDOOR TEMPERATURE, DISCHARGE AND SUCTION PRESSURES. ON THE PLOTS LOCATE OUTDOOR TEMPERATURE (1);
LOCATE INDOOR WET BULB (2); FIND INTERSECTION OF OD TEMP. & ID W.B. (3); READ DISCHARGE OR SUCTION PRESSURE IN LEFT
COLUMN (4).
EXAMPLE: (1) OUTDOOR TEMP. 82 F.
(2) INDOOR WET BULB 67 F.
(3) AT INTERSECTION ACTUAL:
(4) DISCHARGE PRESSURE @ 1450 CFM IS 323 PSIG DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
(5) SUCTION PRESSURE @ 1450 CFM IS 140 PSIG SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHAR
T
INTERCONNECTING LINES
GAS - 7/8" O.D.
LIQUID - 3/8" O.D.
DWG.NO. 4TWX5049E1
110
115
120
125
130
135
140
145
150
155
160
165
170
40 60 80 100 120
200
250
300
350
400
450
500
550
40 60 80 100 120
(1)
(1)
(3)
(3)
(5)
(4)
(2)
(2)
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.
30
40
50
60
70
80
90
100
110
120
130
140
-5 5 15 25 35 45 55 65
200
250
300
350
400
450
500
-5 5 15 25 35 45 55 65
INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.
INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.

18-AC104D1-1G-EN 13
STEP 9 - Record System Information for refer-
ence.
Record system pressures and temperatures
after charging is complete.
Outdoor model number = _________________
Measured Outdoor Ambient = __________ º F
Measured Indoor Ambient = __________ º F
Measured Liquid Line Temp = __________ º F
The Subcooling Charging method in cooling is not recommended below 55º F outdoor
temperature.
The only recommended method of charging at outdoor temperatures below 55º F is weighing in the charge in
heating mode.
STEP 1 - Determine additional charge.
Note:The nameplate charge value represents
the amount of refrigerant shipped in the outdoor
unit and is compatible with 10 feet of AHRI rated
refrigerant lines and the smallest AHRI rated
coil.
Using the method below, find the charge associ-
ated with the additional length of tubing above
10 ft. and record it below.
14.3 Subcooling Charging Below 55º F Outdoor Temp. (In Heating Only)
Measured Suction Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
Suction Gage Pressure = __________ PSIG
Calculating Charge Using the Weigh-In Method
STEP 1 - Measure in feet the distance between the
outdoor unit and the indoor unit. (Include the entire
length of the line from the service valve to the IDU.)
Subtract 10 ft from this entire length and record on
line 1.
STEP 2 - Enter the charge multiplier (0.6 oz/ft).
Each linear foot of interconnecting tubing requires
the addition of 0.6 oz of refrigerant.
STEP 3 - Multiply the total length of refrigerant
tubing (Line 1) times the value on Step 2. Record
the result on Line 3 of the Worksheet.
STEP 4 - This is the amount of refrigerant to
weigh-in prior to opening the service valves.
1. Total Line length (ft) – 10 ft ______________
2. Charge multiplier x ___0.6 oz_____
3. Step 1 x Step 2 = _____________
4. Refrigerant (oz) = _____________
Weigh-In Method can be used for the initial
installation, or anytime a system charge is being
replaced. Weigh-In Method can also be used
when power is not available to the equipment
site or operating conditions (indoor/outdoor
temperatures) are not in range to verify with the
subcooling charging method.

14 18-AC104D1-1G-EN
STEP 2 - Stabilize the system by operating for a minimum of 20 minutes.
At startup, or whenever charge is removed or added, the system must be operated for a minimum of 20 minutes
to stabilize before accurate measurements can be made.
STEP 3 - Check the liquid line temperature and liquid gage pressure to obtain a minimum of 10º subcooling in
heating mode.
Measured Liquid Line Temp = __________ º F
Liquid Gage Pressure = __________ PSIG
STEP 4 - Add charge if a minimum of 10º subcooling is not obtained with the namplate charge plus additional
charge previously added.
STEP 5 - Return to site for adjustment.
Important: Return in the spring or summer to accurately charge the system in the cooling mode with outdoor
ambient above 55º F.
1. Leak check refrigerant lines. ........................................ [ ]
2. Properly insulate suction lines and fittings.................... [ ]
3. Properly secure and isolate all refrigerant lines............ [ ]
4. Seal passages through masonry.
If mortar is used, prevent mortar from coming
into direct contact with copper tubing........................... [ ]
5. Verify that all electrical connections are tight................ [ ]
6. Observe outdoor fan during on cycle for clearance
and smooth operation................................................... [ ]
Section 15. Checkout Procedures
15.1 Operational And Checkout Procedures
CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the following list:
Final phases of this installation are the unit Operational and Checkout Procedures. To obtain proper performance, all units
must be operated and charge adjustments made.
Important: Perform a final unit inspection to be sure that factory tubing has not shifted during shipment. Adjust tubing if nec-
essary so tubes do not rub against each other when the unit runs. Also be sure that wiring connections are tight and properly
secured.
7. Be sure that indoor coil drain line drains freely. Pour water
into drain pan................................................................ [ ]
8. Be sure that supply registers and return grilles are open
and unobstructed.......................................................... [ ]
9. Be sure that a return air filter is installed...................... [ ]
10. Be sure that the correct airflow setting is used.
(Indoor blower motor) ................................................... [ ]
11. Operate complete system in each mode to
ensure safe operation................................................... [ ]

18-AC104D1-1G-EN 15
Section 16. Defrost Control
The demand defrost control measures heat pump out-
door ambient temperature with a sensor located outside
the outdoor coil. A second sensor located on the outdoor
coil is used to measure the coil temperature. The dif-
ference between the ambient and the colder coil tem-
perature is the difference or delta-T measurement. This
delta-T measurement is representative of the operating
state and relative capacity of the heat pump system. By
measuring the change in delta-T, we can determine the
need for defrost. The coil sensor also serves to sense
outdoor coil temperature for termination of the defrost
cycle.
Termination Temperature
Defrost controls have a selectable termination tem-
perature. As shipped, defrost will terminate at 47°F. For
a higher termination temperature, cut Jumper J2 to
achieve 70°F when at or below 30°F ambient.
Fault Identication
A fault condition is indicated by the flashing light on the
defrost control inside the heat pump control box.
In normal operation, the defrost control light will flash
once each second. If the light is flashing more than once
per second or not at all, refer to the Defrost Checkout
sheet found with the service information in the control
box.
Pin Identication
1. TEST_COMMON (Shorting any of the other pins to
this pin causes the function of the other pin to be
executed. Leaving this pin open results in the normal
mode of operation.)
2. TST = Test (Shorting TEST_COMMON to this pin
speeds up all defrost board timings.)
3. FRC_DFT = Forced Defrost (Short TEST_COM-
MON to this pin for two [2] seconds to initiate a
forced defrost. Remove the short after defrost initi-
ates.)
Defrost Control Checkout
Normal operation requires:
a. LED on board flashing 1 time/second.
b. 24V AC between R & B.
c. 24V AC between Y & B with unit operating.
d. Defrost initiation when FRC_DFT pin is shorted to
TEST_COMMON pin.
If a defrost control problem is suspected, refer to the
service information in control box.
DEFROST TERMINATION TEMPERATURE
J1
U1
J2
J3
FRC_DFT
TST
TEST_COMMON
JUMPER 2
TEST PINS
Defrost controls have a selectable termination temper-
ature. Cutting jumper J2 (shown below) will achieve a
termination temperature of 70° when the ambient tem-
perature is below 30° (see table at left).
Defrost Board
Detail
Defrost Termination Temperatures
Outdoor
Temp.
Termination
Temperature
As
Shipped
>22°F 47°F
10°F–22°F ODT + 25°F
6°F–10°F 35°F
Cut
Jumper 2
>30°F 47°F
6°F–30°F 70°F
All
< 6°F 12 min. or 35°F
every 3 hrs.
≤0°F Outdoor unit will be turned OFF
≥5°F Resume outdoor unit operation
Defrost Termination Temperatures
Outdoor
Temperature
Termination
Temperature
As
Shipped
>22°F 47°F
10°F–22°F ODT + 25°F
6°F–10°F 35°F
Cut
Jumper 2
>30°F 47°F
6°F–30°F 70°F
All < 6°F 12 min. or 35°F
every 3 hrs.
For 024N, 048N & 060N Models
For 036N Models only

16 18-AC104D1-1G-EN
Test Pins
J1
To Coil on
EEV
J6
OPEN
CLOSE
TEST
J7
OPEN
CLOSE
TEST
STAT US LED
(Green)
Fault LED
(Red)
See Table 2
Suction Line
Pressure
Transducer Input
J10
See Table 1
Suction Line
Temperature
Sensor Input
See Table 3
Control Input
24 VAC Stage/Mode
DC V TEST
POINT
EEV CONTROL BOARD TEST POINTS
Note: Close Valve and Open Valve Tests are active in any mode of operation
Test Pins: OPEN, CLOSE, TEST (See EEV Board drawing for locations)
Close Valve Test - Touch CLOSE pin to TEST pin.
EEV drives closed (5 seconds max) and stays closed for 1.5 minutes (90 seconds).
1) Status LED will be flashing.
2) Gauges should indicate suction pressure dropping.
• Valve is working.
• LPCO may trip.
Note: The Close Valve Test will exit after 1.5 minutes (90 seconds) and will not reinitiate (requires a break and make to
initialize). To clear faults stored in memory, apply a jumper between Close and Test pins for 10 seconds.
Open Valve Test - Touch OPEN pin to TEST pin.
EEV drives open (5 sec max) and stays open for 30 seconds.
1) Status LED will be flashing.
2) Temperature probe should indicate superheat falling.
• Valve is working.
Note: If jumper is left on pins, the OPEN VALVE TEST will be cleared after 30 seconds and will not reinitiate (requires a
break and make to reinitialize).
Exit Test Mode - The Open Valve Test or Closed Valve Test can be cancelled by jumping to the opposite mode Test pin.
The system will return to normal super heat control.
Test mode will cancel if:
1) Unit enters Defrost
2) Y1 input is lost

18-AC104D1-1G-EN 17
Temp °F Temp °C
THERMISTOR
RESISTANCE
(OHMS)
Volts DC at Plug J10
(pin to pin)
0 -17.8 83247 3.87
5 -15.0 71108 3.73
10 -12.2 60916 3.57
15 -9.4 52333 3.41
20 -6.7 45076 3.25
25 -3.9 38927 3.08
30 -1.1 33703 2.91
35 1.7 29253 2.73
40 4.4 25452 2.56
45 7.2 22198 2.39
50 10.0 19405 2.22
55 12.8 17002 2.06
60 15.6 14930 1.90
65 18.3 13138 1.75
70 21.1 11586 1.61
75 23.9 10238 1.48
80 26.7 9065 1.36
85 29.4 8043 1.24
90 32.2 7150 1.14
95 35.0 6368 1.04
100 37.8 5682 0.95
105 40.6 5079 0.86
110 43.3 4548 0.79
115 46.1 4079 0.72
120 48.9 3665 0.66
125 51.7 3298 0.60
130 54.4 2972 0.54
135 57.2 2683 0.50
136 57.8 2629 0.49
137 58.3 2576 0.48
138 58.9 2525 0.47
139 59.4 2474 0.46
140 60.0 2425 0.45
141 60.6 2377 0.45
142 61.1 2330 0.44
143 61.7 2284 0.43
144 62.2 2239 0.42
145 62.8 2195 0.41
146 63.3 2153 0.41
147 63.9 2111 0.40
148 64.4 2070 0.39
149 65.0 2030 0.39
150 65.6 1990 0.38
TABLE 1
Suction Line Temperature Sensor - J10
Suction Line
Pressure Transducer
Suction Line
Temperature Sensor
Pressure
(PSIG)
Volts DC at plug J7
(to test point common)
34 0.8
41 0.9
51 1.0
60 1.1
70 1.2
80 1.3
89 1.4
99 1.5
108 1.6
118 1.7
130 1.8
140 1.9
147 2.0
159 2.1
169 2.2
178 2.3
188 2.4
198 2.5
Suction Line
Pressure Transducer - J7
TABLE 2
Voltage to pressure reference Chart

18 18-AC104D1-1G-EN
24 VAC at plug J6
Standby B to R
1st Stage ON ON B to R & Y1
2nd Stage ON OFF ON ON ON B to R, Y1 & Y2
Standby OFF OFF B to R & O
1st Stage ON B to R, Y1 & O
2nd Stage ON OFF ON B to R, Y1, Y2 & O
EEV control STATUS LED
1 sec 2 sec 3 sec 4 sec
ON Continuous
ON
OFFOFF
Heat
TABLE 3
Control Input and Status LED - J6
ON
Cool
OFF
OFF
OFF
OFF
ELECTRONIC EXPANSION VALVE (EEV) CONTROL BOARD
LED
Color
EEV
Fault LED Description
3 Flash Suction Pressure Transducer input is out of range (Replace transducer) (1)
4 Flash Suction Temperature Sensor input is out of range (Replace sensor) (1)
5 Flash Coil has short circuit (Replace Coil) (2)
6 Flash Valve is not responding to a position change command (Possible stuck valve)
7 Flash Valve is responding but system is not performing properly (Low charge or restriction)
8 Flash Compressor is not pumping (3)
9 Flash Low superheat in Cooling Mode (Indoor TXV stuck open or ID Fan failure)
10 Flash Not used at this time
(3) Monitor superheat and pressure: <3' SH for 5 minutes with valve @ minimum position, Monitor off-cycle
pressure and compare to next on-cycle for pressure drop within 60 seconds
Red
(1) Valve will close and LPCO will trip
OFF
1 Flash
Standby
Coil has an open circuit or intermittent short (Replace Coil)
(2) Power supply will shut down to protect board
EEV Fault Codes
EEV not used on all models
2 Flash Control has detected an internal failure (Replace EEV control board)
The following may require additional diagnostics
Notes:
Printed from D802247P01 Rev08
Fault LED (Red)
OPEN
CLOSE
TEST
STATUS LED
(Green)
Fault LED
(Red)
Status LED (Green)
On - Control has power
Flashing Fast - Control is driving valve (5 seconds max drive
time)
Flashing Pattern - See Table 6.
Fault Storing/CleAHRIng:
Faults 6-9 will be stored in non-volatile memory. See Close Valve Test for fault clearing procedure.
Faults 1-5 will clear with a power cycle.

18-AC104D1-1G-EN 19
TROUBLESHOOTING THE EEV
System is pumping down
in heat mode
EEV is not sensing that the compressor is
ON and in the Heat Mode
1. Check plug and harness to J6
2. Verify 24VAC at Y1 and/or Y2 inputs to
EEV control J6 are present (not “O”) See
Table 3 in page 19.
EEV valve is stuck closed
1. See for Open Valve Test
System is very low on charge
1. Check charge
Low superheat (flooding) in
heating mode
EEV valve is stuck open
1. See for Close Valve Test
Sensors are out of calibration
1. Verify sensors are accurate. See Table 1
& 2 in page 18
High superheat (low
suction pressure) in
heating mode
System is low on charge
1. Check charge
EEV valve is stuck closed
1. See for Open Valve Test
Sensors are out of calibration
1. Verify sensors are accurate. See Table 1
& 2 in page 18
EEV Hunting
(Suction pressure moves
up & down)
Sensor are out of calibration
1. Verify sensors are accurate. See Table 1
& 2 page 18
Verify temperature sensor is clipped tight
to suction line and insulated
Verify Outdoor Unit:
1. Is free and clear of ice and debris
2. Has adequate clearance
3. Distributor tubes are not bent or kinked
The Electronic Expansion Valve (EEV) installed in this heat pump is designed to control
superheat entering the compressor when the system is running in mechanical heating mode.
During cooling mode, refrigerant flow reverses through the outdoor EEV and superheat is
controlled by the expansion device in the indoor unit. Therefore, any operational problems
observed in cooling mode are not caused by the outdoor EEV.
The following flow chart was designed to assist in troubleshooting the EEV.
Note: The EEV closes with every OFF cycle in the heating mode of operation. During
Defrost and in the cool
sound can be heard when valve is changing positions.
ing mode of operation, the EEV will drive to full open. An audible

20 18-AC104D1-1G-EN
Section 17. Troubleshooting
Is contactor
energized?
(contacts closed)
Is voltage
present at
contactor coil?
Replace contactor
YES
NO
NO
Check for 24 volts AC
across contactor coil
Check control
transformer and
control fuse
Is the control
transformer
and fuse good?
NO
YES
Repair or replace
transformer or fuse.
Investigate cause for
failure (possible short in
field wiring)
Jumper R to Y low
voltage terminals
at thermostat sub
base.
Does the
contactor
energize?
NO
Repair or replace
connecting wiring
YES Go To: Compressor won’t run
Replace the room
thermostat
YES
Compressor fails to start
Contactor check