18 BC86D1 4 01/01/2012 Trane Installer's Guide Heat Pumps 4TWX6 XL16i Installation

User Manual: 4TWX6

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18-BC86D1-4

Installer’s Guide
Heat Pumps
4TWX6

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 information 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..................................................................... 5
Section 4. Setting the Unit...................................................................... 5
Section 5. Refrigerant Line Considerations.......................................... 6
Section 6. Refrigerant Line Routing...................................................... 7
Section 7. Refrigerant Line Brazing....................................................... 8
Section 8. Refrigerant Line Leak Check.............................................. 10
Section 9. Evacuation............................................................................ 11
Section 10. Service Valves.................................................................... 11
Section 11. Electrical - Low Voltage..................................................... 13
Section 12. Electrical - High Voltage.................................................... 16
Section 13. Start Up............................................................................... 17
Section 14. System Charge Adjustment.............................................. 18
Section 15. Checkout Procedures and Troubleshooting.................... 26

Section 1. Safety
▲! WARNING
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 connection with its use.

▲! WARNING
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 cylinders 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 “hygroscopic” 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.

▲! CAUTION
If using existing refrigerant lines make certain that all
joints are brazed, not soldered.

! CAUTION
▲
Scroll compressor dome temperatures may be hot. Do
not touch the top of compressor; it may cause minor to
severe burning.

▲! WARNING
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.

▲! WARNING
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.

2 18-BC86D1-4

Section 2. Unit Location Considerations
2.1 Unit Dimensions and Weight
Table 2.1
Unit Dimensions and Weight
Models

H x D x W (in)

Weight* (lb)

4TWX6024G

50 x 34 x 37

257

4TWX6036G

54 x 34 x 37

257

4TWX6048G

54 x 34 x 37

310

4TWX6060E/G

54 x 34 x 37

311

* Weight values are estimated.

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.

Please refer to application bulletin APPAPG013-EN for detailed mounting information.
2.2 Refrigerant Piping Limits
1. The maximum length of refrigerant lines
from outdoor to indoor unit should NOT
exceed sixty (60) feet.
2. The maximum vertical change should not
exceed twenty five (25) feet*.
3. Service valve connection diameters are
shown in Table 5.1.
Note: For line lengths greater than sixty (60)
feet, Refer to Refrigerant Piping Application
Guide, SS-APG006-EN or Refrigerant Piping
Software Program, 32-3312-03 (or latest revision).

Standard
Line Set
60’ Max
Line Length

35’ Max
Line
Length
25’ *
Max
Line
Lift

25’*
Max
Line
Lift

35’ Max
Line
Length

* Restricted to maximum vertical change of 25 ft.

18-BC86D1-4

2.3 Suggested Locations for Best Reliability
Ensure the top discharge area is unrestricted for
at least five (5) feet above the unit.

Avoid Install
Near Bedrooms

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.

Min 5’ Unrestricted

Min. 12” to
Shrubbery

Avoid locations such as near windows where
condensation and freezing defrost vapor can
annoy a customer.

Min 3’
Unrestricted

Access Panel

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.

Min. 12” to
Shrubbery

Min. 12”
to Wall

2.4 Cold Climate Considerations
NOTE: It is recommended that these precautions be taken for units being installed in areas
where snow accumulation 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.

Min. 12”

Snow
Barrier

Snow Legs

3-12” Elevation
Pad

4 18-BC86D1-4

2.5 Coastal Considerations
If installed within one mile of salt water, including seacoasts and inland waterways, models without factory
supplied Seacoast Salt Shields require the addition of BAYSEAC001 (Seacoast Kit) at installation time. Please
refer to Application Guide SS-APB006-EN: Trane - Sea Coast Applications and Seascoast Corrosion Protection
Bulletin UN-SVB11A-EN.

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.

STEP 2 - To remove the unit from the pallet,
remove tabs by cutting with a sharp tool.

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.
For other applications refer to Application Guide
APP-APG013-EN.

18-BC86D1-4

Section 5. Refrigerant Line Considerations
5.1 Refrigerant Line and Service Valve Connection Sizes
Table 5.1
Line Sizes

Service Valve Connection Sizes

Model

Vapor
Line

Liquid
Line

Vapor Line
Connection

Liquid Line
Connection

4TWX6024G

5/8

3/8

5/8

3/8

4TWX6036G

3/4

3/8

3/4

3/8

4TWX6048G

7/8

3/8

7/8

3/8

4TWX6060E/G

1-1/8

3/8

1-1/8

3/8

5.2 Factory Charge
Trane outdoor condensing units are factory charged with the system charge required for the outdoor condensing
unit, fifteen (15) feet of tested connecting line, and the smallest indoor evaporative coil match. If connecting line
length exceeds fifteen (15) feet and/or a larger indoor evaporative coil is installed, then final refrigerant
charge adjustment is necessary.

5.3 Required Refrigerant Line Length
Determine required line length and lift. You will
need this later in STEP 2 of Section 14.

Total Line Length = __________ Ft.

Line Length

Total Vertical Change (lift) = __________ Ft.

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.

Liquid Line

Vapor Line
Insulation

6 18-BC86D1-4

5.5 Reuse Existing Refrigerant Lines
! CAUTION
▲

If using existing refrigerant lines make certain
that all joints are brazed, not soldered.
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.
Important: For more information see publication numbers SS-APG006-EN and APPAPG011-EN.

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.

Comply with National, State, and Local Codes when
isolating line sets from joists, rafters, walls, or other
structural elements.

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.
8 Feet Maximum
Joist/Rafter
Isolator

Side View
8 Feet Maximum

Line Set

Secure Vapor line from joists using isolators every 8 ft. Secure
Liquid Line directly to Vapor line using tape, wire, or other appropriate method every 8 ft.
Isolation From Joist/Rafter

18-BC86D1-4

8 Feet Maximum

Wall
Isolator

8 Feet Maximum

Side View

Line Set

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.
Isolation In Wall Spaces

Wall
Sealant
Ductwork
Insulation
Vapor Line
Isolator

Line Set

Isolation Through Wall

DO NOT hang line sets from ductwork

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.

8 18-BC86D1-4

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.
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: Precautions should be taken to avoid
heat damage to basepan during brazing. It is
recommended to keep the flame directly off of
the basepane.

18-BC86D1-4

STEP 5 - Replace the pressure tap valve cores
after the service valves have cooled.

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.

150 PSIG

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.

10 18-BC86D1-4

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.

0350
Microns

STEP 1 - Evacuate until the micron gauge reads
no higher than 350 microns, then close off the
valve to the vacuum pump.

OFF

STEP 2 - Observe the micron gauge. Evacuation
is complete if the micron gauge does not rise
above 500 microns in one (1) minute.

1 MIN.

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.

CAP

NOTE: Do not vent refrigerant gases into the
atmosphere

VALVE STEM

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.

1/4 TURN ONLY
COUNTERCLOCKWISE
FOR FULL OPEN
POSITION

UNIT SIDE
OF VALVE

PRESSURE TAP PORT
GAS LINE CONNECTION

18-BC86D1-4

10.1 Open the Liquid Service Valve

▲! WARNING
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.

Cap

Unit Side
of Service
Valve

3/16” Hex Wrench

Rolled Edge to
Captivate Stem

Important: Leak check and evacuation must be
completed before opening the service valves.

Hex Headed
Valve System

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.)

Service Port

STEP 3 - Replace the valve cap to prevent leaks.
Tighten finger tight plus an additional 1/6 turn.

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.

12 18-BC86D1-4

11.2 Low Voltage Hook-up Diagrams

4TEE3F31-66
Variable Speed Air Handler Hook-up
Diagram
Heat Pump

Neatly bundle all low voltage
wires behind the service
valve cover as shown.

Variable Speed
Air Handler
Comfort Control
R
Y1
Y2
G
W1
X2

Red
Yellow
Brown
Green
White

B
O

Blue
Orange

R
O
YLO
Y
BK
G
W1
W2
W3
B

Orange

Red

Red
Yellow
Yellow

Black
Yellow/Red

Brown

Blue

(X2)

Notes:
1. If electric heat does not
have 3rd contactor (CH),
connect a jumper wire from
W3 to W2. If electric heat
does not have 2nd contactor
(BH), connect a jumper wire
from W2 to W1.
2. Installer must remove the
factory installed jumper
between R and BK on the
air handler terminal strip.
3. Installer must add a field
installed jumper between
R and O on the air handler
terminal strip.
4. 4TWX6 units require 80%
airflow with Y1 (low stage)
and 100% airflow with Y2
(high stage).
A) Connect Y1 from comfort
control to Y at the VS air
handler and to Y1 (yellow) at the HP.
B) Connect Y2 from comfort
control to BK at the VS
air handler and to Y2
(yellow/red) at the HP.

Black

Blue
Orange

Communicating Indoor Unit
with 24 V Control Hook-up
Diagram
Air Conditioner or
Heat Pump - Note 6
Neatly bundle all low voltage
wires behind the service
valve cover as shown.

Comfort Control
R
Y1
Y2
G
W1
X2
B
O

Red
Yellow
Brown
Green
White
Blue
Orange

Comm. Variable Speed
Furnace or Air Handler - Note 1
R
BK
D
Yellow
Y1
Y2
G
W1
W2
W3
B
O

Note 7
Orange

Red

Red
Yellow

Black
Yellow/Red

Brown

Blue

(X2)

Black

18-BC86D1-4

Blue
Orange

Notes:
1. See User Interface setup
menu for 24 VAC control
mode and cooling CFM
options.
2. First stage CFM options
for 4TWX6 are 65–80%.
3. For furnace+heat pump
applications, comfort
control must be dual fuel
capable or use accessory
TAYPLUS103A.
4. W3 terminal may not be
present on indoor unit.

Variable Speed Furnace
Hook-up Diagram

Heat Pump

Neatly bundle all low voltage
wires behind the service
valve cover as shown.

Variable Speed
Furnace
R
O
YLO
Y
BK
G
W1
W2
B

Comfort Control
R
Y1
Y2
G
W1
X2
B
O

Red
Yellow
Brown
Green
White
Blue
Orange

Orange

Red

Red
Yellow
Yellow

Black

Blue

(X2)

Yellow/Red

Brown
Black

Blue
Orange

Notes:
1. Comfort control must be dual
fuel capable or use accessory TAYPLUS103A.
2. Installer must cut the factory
R to BK jumper on furnace
circuit board. OR, on new
15-digit models, set the S5-2
DIP switch to OFF.
3. Installer must add a field
installed jumper between R
and O on the furnace terminal strip
4. 4TWX6 units require 80%
airflow with Y1 (low stage)
and 100% airflow with Y2
(high stage).
A) Connect Y1 from comfort
control to Y at the VS furnace and to Y1 (yellow) at
the HP.
B) Connect Y2 from comfort
control to BK at the VS
furnace and to Y2 (yellow/
red) at the HP.
5. Comfort control may not
have W2 or W3 terminals.
6. If single stage heating comfort control is used, jumper
W1 to W2 on the furnace
terminal strip.

*AM7 Air Handler
Hook-up Diagram
Heat Pump

Neatly bundle all low voltage
wires behind the service
valve cover as shown.

Black

Air Handler

(X2)

Comfort Control
X2
W
G
Y1
O
R
B
Y2

White
Green
Yellow
Orange
Red
Blue
Brown
Field wiring

W3
W2
W1
G
YI (In)
O
R
B
YO (Out)
Y2
DH/BK

Yellow/Red

Orange
Blue

W1 - White

Yellow

Red

O - Orange
R - Red
B - Blue
Y1 - Yellow
Y2 - Brown

14 18-BC86D1-4

*AM7 Air Handler Hook-up (Continued)
OUTDOOR
on

HP
1
1

1 2 3 4 5

Control
Board

} Capacity (Tons)

2 (Compressor)
S1

INDOOR

R NET 1

}

Cool Off Delay

}

CFM/Ton

C22

Torque
D9

C10
C21

C19

C15

C18

C12

R13
R14

Must configure to “ON” for 16 SEER
two-stage compressors.

R NET 2

R22

1 2 3 4 5

Must configure to “OFF” for heat pump.

AC (System)
2 (Stages)

CFM
S2
+12V

11.3 Defrost Control
Defrost controls have a selectable termination temperature. 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. See Service
Facts shipped in the outdoor unit for more information.
Pin Identification (See Illustration at right)
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_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:
• LED on board flashing 1 time/second.
• 24V AC between R & B.
• 24V AC between Y & 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 Termination Temperatures

As
Shipped

Outdoor
Temperature

Termination
Temperature

>22°F

47°F

10°F–22°F

ODT + 25°F

6°F–10°F

35°F

>30°F

47°F

6°F–30°F

70°F

< 6°F

12 min. or 35°F
every 3 hrs.

Defrost Board
Detail

J1
J2
J3

JUMPER 2

FRC_DFT

18-BC86D1-4

TST

TEST_COMMON

All

TEST PINS

LOW_FAN

Cut
Jumper 2

Section 12. Electrical - High Voltage
12.1 High Voltage Power Supply

▲! WARNING
LIVE ELECTRICAL COMPONENTS!
During installation, testing, servicing, and
troubleshooting 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.
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 the
Service Facts document included with the unit.
12.2 High Voltage Disconnect Switch
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.

12.3 High Voltage Ground
Ground the outdoor unit per national, state, and
local code requirements.

16 18-BC86D1-4

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.

OFF
DONE

CANCEL

STEP 3 - Turn on disconnect(s) to apply power
to the indoor and outdoor units.

OFF

STEP 4 - Wait one (1) hour before starting the
unit if compressor crankcase heater accessory is used and the Outdoor Ambient is below
70ºF.

60 MIN.

STEP 5 - Set system thermostat to ON.

ON
DONE

18-BC86D1-4

CANCEL

Section 14. System Charge Adjustment
14.1 Temperature Measurements
STEP 1 - Check the outdoor temperatures.
Subcooling (in cooling mode) is the only recommended method of charging above 55º F ambient outdoor temperature. See Section 14.2.

120º F

See Section 14.2 for
Outdoor
Temperatures
Above 55º F

55º F

Outdoor Temp 1

For outdoor temperatures below 55º F, follow
the Superheat charging instructions (in heating
mode). See Section 14.3.
Note: It is important to return in the spring or
summer to accurately charge the system in the
cooling mode with outdoor ambient temperature
above 55ºF.

See Section 14.3 for
Outdoor
Temperatures
Below 55º F

55º F

Outdoor Temp 2

For best results the indoor temperature should
be kept between 70º F to 80º F.

80º F
70º F

Indoor Temp

14.2 Subcooling Charging in Cooling (Above 55º F Outdoor Temp.)
STEP 1 - Use the refrigerant line total length
and lift measurements from Section 5.3.
Total Line Length = __________ Ft.
Vertical Change (Lift) = __________ Ft.
LIFT

18 18-BC86D1-4

STEP 2 - Determine the final subcooling value using total Line Length and Lift measured in STEP 1 and the charts below.

3 Ton Unit

SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
40
30
25
20
15
10
0

25 ft. Maximum Lift

Add 2o

Add 3o

Add 1o
Use design subcooling
20
25
30
40
TOTAL REFRIGERANT LINE LENGTH (FT)

REFRIGERANT LINE LIFT (FT)

2 Ton Unit

SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
40
30
25
20
15
10
0

25 ft. Maximum Lift

Add 1o
10

Use design subcooling
20
25
30
40
TOTAL REFRIGERANT LINE LENGTH (FT)

SUBCOOL CHARGING CHART CORRECTIONS TABLE

25 ft. Maximum Lift

Add 3º
Add 1º
10

Add 4º

Add 2º
Use Design Subcooling
20
25
30
40
TOTAL REFRIGERANT LINE LENGTH (FT)

Add 1o
60

5 Ton Unit

REFRIGERANT LINE LIFT (FT)

4 Ton Unit

60
50
40
30
25
20
15
10
0

Add 3o

Add 2o

SUBCOOL CHARGING CHART CORRECTIONS TABLE
60
50
40
30
25
20
15
10
0

25 ft. Maximum Lift

Add 4º
Add 3º
Add 1º
10

Add 2º

Use Design Subcooling
20
25
30
40
TOTAL REFRIGERANT LINE LENGTH (FT)

Design Subcooling Value = __________º F
(from nameplate or Service Facts)

Subcooling Correction = __________º F
Final Subcooling Value = __________º F

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.

18-BC86D1-4

20 MIN.

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 = __________ PSI
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 PSI. (This is the shown as
the intersection of the Final Subcooling column
and the Liquid Temperature row.

107 °F

Table 14.2

R-410A REFRIGERANT CHARGING CHART
FINAL SUBCOOLING (°F)
LIQUID
8
9
10 11 12 13 14
TEMP
(°F)
LIQUID GAGE PRESSURE (PSI)
55
60
65
70
75
80
85
90
95
100
105
110
115
120
125

179
195
211
229
247
267
287
309
331
355
381
407
435
464
495

182
198
215
232
251
271
291
313
336
360
386
413
441
470
501

185
201
218
236
255
275
296
318
341
365
391
418
446
476
507

188
204
222
240
259
279
300
322
346
370
396
424
452
482
514

191
208
225
243
263
283
304
327
351
376
402
429
458
488
520

195
211
229
247
267
287
309
331
355
381
407
435
464
495
527

198
215
232
251
271
291
313
336
360
386
413
441
470
501
533

From Dwg. D154557P01 Rev. 3

20 18-BC86D1-4

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.

20 MIN.

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.

(Example
only - see Service Facts)
PRESSURE CURVES FOR 4TWX5049E1000B
4TEE3F49C1

4TEE3F49C1

Cooling @ 1450 SCFM

Refer to System Pressure Curves in the Service
Facts to verify typical performance.

DISCHARGE PRESSURE (PSIG)

550

Heating @ 1350 SCFM

500

INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.

500

(2)

450

INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.

450
400

400
350
350

(4)

(3)

300

250

(1)

200
40

200
100

-5

120

OUTDOOR TEMPERATURE (Degree F)
170

SUCTION PRESSURE (PSIG)

165
160

140

INDOOR ENTERING
WET BULB CURVES
TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.

150
145

120
110
100

(5)

140

INDOOR ENTERING
DRY BULB CURVES
TOP TO BOTTOM
80, 70, AND 60 DEG F.

130

(2)

155

(3)

135

130

70
60

125

120
115

(1)

110
40

30
100

120

-5

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
(4) DISCHARGE PRESSURE @ 1450 CFM IS 323 PSIG
(5) SUCTION PRESSURE @ 1450 CFM IS 140 PSIG

ACTUAL:
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART

INTERCONNECTING LINES
GAS - 7/8" O.D.
LIQUID - 3/8" O.D.
DWG.NO. 4TWX5049E1

18-BC86D1-4

STEP 9 - Record System Information for reference.
Record system pressures and temperatures
after charging is complete.
Outdoor model number = _________________

Measured Suction Line Temp = __________ º F

Measured Outdoor Ambient = __________ º F

Liquid Gage Pressure = __________ PSI

Measured Indoor Ambient = __________ º F

Suction Gage Pressure = __________ PSI

Measured Liquid Line Temp = __________ º F

14.3 Subcooling Charging Below 55º F Outdoor Temp. (In Heating Only)
STEP 1 - Check the outdoor temperature. If
the ODT is less than 55º F, follow these charging instructions for the heating mode of operation. For temperatures above 55º F, see Section 14.1.
Note: It is important to return in the spring or
summer to accurately charge the system in
the cooling mode with outdoor ambient above
55ºF.

80º F
70º F

55º F

Outdoor Temp

Indoor Temp

For best results the indoor temperature should
be kept between 70º F and 80º F. See the
Indoor Temp illustration. Add system heat if
needed.

STEP 2 - Stabilize the system by operating in
the heating mode for a minimum of 20 minutes.
Important: Whenever charge is added or removed, the system must run for a minimum of
20 minutes before accurate measurements can
be made.

20 MIN.

22 18-BC86D1-4

36 °F

STEP 3 - Measure the suction line pressure and
temperature at the “true” suction line and record
the values below.
Note: the side service panel will need to be
removed to gain access to this area.
Attach temperature probe and the gage as
shown. Ensure the probe is securely attached
and well insulated.

Measured
Suction Line Temperature = __________º F
Measured
Suction Line Pressure = __________º F

Compare these values to the 15 degree superheat chart in Table 13.2.

18-BC86D1-4

STEP 4 - Use the measured values from Step 3
to determine a target superheat of 15 degrees.

Example: Assume a suction pressure of 81 PSI
and a suction temperature of 36º F.
When the suction temperature is in line with
the suction gage pressure, the target superheat
value will be 15 degrees. (Example values highlighted in Table 13.2)

Table 13.2

15 degree Superheat Chart
Suction Line
Temp

Suction Gage
Pressure

10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
62
64
70

42
44
47
50
52
55
58
61
64
67
70
74
77
81
84
88
92
96
100
104
108
112
117
121
126
131
136
141
157

STEP 5 - Adjust refrigerant level to attain 15
degrees of superheat.

Add refrigerant if the suction line temperature
is above the value that is in line with the measured suction gage pressure.
1.
2.
3.
4.

Connect gages as shown in Step 3.
Purge all hoses.
Open bottle.
Stop adding refrigerant when the suction line temperature is in line with the
measured suction line pressure in Table
13.2.

Recover refrigerant if the suction line temperature is lower than the temperature that is in line
with the system’s suction pressure.

24 18-BC86D1-4

STEP 6 - Stabilization and completion.
1. Wait 20 minutes for the system condition to stabilize between adjustments.

20 MIN.

Note: When the suction temperature is in line
with the suction gage pressure, the target superheat value will be 15 degrees.
2. Remove gages.
3. Replace service port caps to prevent
leaks. Tighten finger tight plus an additional 1/6 turn.

STEP 7 - Target 10–15 degrees of subcooling
using Section 14.1 as a guide.
Note: It is important to return in the spring or
summer to accurately charge the system in the
cooling mode with outdoor ambient above 55ºF.

STEP 8 - Verify typical performance.

(ExamplePRESSURE
only CURVES
- seeFORService
Facts)
4TWX6048G

Refer to System Pressure Curves in the Service
Facts to verify typical performance.

DISCHARGE PRESSURE (PSIG)

4TEE3F49C1

Cooling with Expansion Valve

Heating with Expansion Valve

INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
71, 67, 63 AND 59 DEG F.

INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
80, 70, AND 60 DEG F.

550

2ND STAGE

500
450

450

400

350

300

250

200

200
40

1ST STAGE

500

100

120

(2)

400

350

300

250

1ST STAGE

(3)

(4)

(1)
40

400
2ND STAGE

200
100

120

200
-5 5 15 25 35 45 55 65

-5

5 15 25 35 45 55 65

SUCTION PRESSURE (PSIG)

OUTDOOR TEMPERATURE (Degree F)
INDOOR ENTERING WET BULB CURVES TOP TO BOTTOM
18059 DEG F.
71, 67, 63 AND

180

2ND STAGE

170
160

160

150

140

130

120

110
40

100

140
130

1ST STAGE

170

120

(2)
(3)

(5)

110
120
40

INDOOR ENTERING DRY BULB CURVES TOP TO BOTTOM
14060 DEG F.
80, 70, AND

2ND STAGE

130
110

100

(1)
60

30
100

120

1ST STAGE

120

110

30
-5 5 15 25 35 45 55 65

-5

15 25 35 45 55 65

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
(4) DISCHARGE PRESSURE @ 1130 CFM IS 297 PSIG
(5) SUCTION PRESSURE @ 1460 CFM IS 148 PSIG

ACTUAL:
DISCHARGE PRESSURE SHOULD BE +/- 10 PSI OF CHART
SUCTION PRESSURE SHOULD BE +/- 3 PSIG OF CHART

INTERCONNECTING LINES
GAS - 7/8" O.D.
LIQUID - 3/8" O.D.
DWG.NO. 4TWX6048G1

18-BC86D1-4

Section 15. Checkout Procedures and Troubleshooting
15.1 Operational And Checkout Procedures
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 necessary so tubes do not rub against each other when the unit runs. Also be sure that wiring connections are tight and properly
secured.

CHECKOUT PROCEDURE
After installation has been completed, it is recommended that the entire system be checked against the following list:
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.................................................... [

]

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.................................................... [

]

26 18-BC86D1-4

15.2 Troubleshooting
.
DEF
OL
NTR DEF.
CO
Y
ST RELA ING
RO
K
T
D E F F RO S
LEA E
DE VALVE ECTIV
CK
DEF NG
CHE COIL LEAKI
S
SOV SOV CTION
T R I OW
RES AIRFL
IR.
EAT
.C
I.D.
R E F R E S. U P E R H N
S
PE
KO
TUC ION
V S CULAT
/EE
W
R
TXV RECI IRFLO
R
D. A BLES
.
. AI
O.D RES. O ENSA D
D
N
L OA
NCO AP.
NO E EV ARGE
H
IV
ESS
ERC GE
EXC EF. OV CHAR .
R
P
R
NDE COM
T
.U
REF FICIEN SSOR
F
RE E
INE
S
MP
CO E FU
CK
AG C O I L
STU VOLT
R
O
LOW TACT STAT
O
N
RM
CO
R
THE ORME
NSF ING
TRA WIR
OL
G E AC T S
NTR
LTA
CO W VO CONT AY
EL
LO TOR
C
TR
NTA STAR CITOR
CO
A
CAP ITOR
C
RT
STA CAPA IOL
RUN SSOR G
RE IRIN
MP
CO AGE W PLY
OLT
SUP E
H V ER
H I G P OW K M O D
C
CHE
TO
AT

SYSTEM FAULTS
REFRIGERANT CIRCUIT
Head Pressure Too High
Head Pressure Too Low
Suction Pressure Too High
Suction Pressure Too Low

Liquid Refrig. Floodback (TXV/EEV)
Liquid Refrig. Floodback
(Cap. Tube)
I.D. Coil Frosting
Compressor Runs
Inadequate or No Cooling/Htg
ELECTRICAL
Compressor & O.D. Fan
Won’t Start
Compressor Will Not Start
But O.D. Fan Runs
O.D. Fan Won’t Start
Compressor Hums But Won’t Start
Compressor Cycles on IOL
I.D. Blower Won’t Start

P
P

C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H
C
H

S
S
S
S

P
P

S
S

S
P

P
P

S
S
P

P
P

S
S
S
S
S
S

S
S
S
S

S
S
P
P

S
S

P
P
P
P

S
S
S

P
P

P
P
P
P
P
P

P
P
P
P

S
S
S
S

S
S

P
P
P
P
P
P
P
P

S
S

S
S
S
S

P
P

S
S

P
P

S
S

P
P

S
S

P
P

S
S
S

S
S

P
P
P

P
P
S
S

S
S

P
P

S
S

P
P
P
P

S
S
S
S
S
S
S
S

P
P
P
P
S
S

P
P

S
S

P
P

S
S

DEFROST
Unit Won’t Initiate Defrost
Defrost Terminates on Time
Unit Icing Up

C - Cooling

H - Heating

C
H
C
H
C
H

P - Primary Causes

P
P
P

S - Secondary Causes

18-BC86D1-4

P
P

- 3 Phase Only

6200 Troup Highway
Tyler, TX 75707
www.trane.com

The manufacturer has a policy of continuous product and product data improvement
and it reserves the right to change design and specifications without notice.
Representative-only illustrations included in this document.
© 2011 Trane

01/12

28 18-BC86D1-4

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Hist model                      : 4TWX6024E1000AA|4TWX6036E1000AA|4TWX6048E1000A|4TWX6048E1000AA|4TWX6060E1000A|4TWX6060E1000AA|4TWX6048G1000A|4TWX6048G1000AA
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18 BC86D1 4 01/01/2012 Trane Installer's Guide Heat Pumps 4TWX6 XL16i Installation

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