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Trane - by Trane Technologies (NYSE: TT), a 

global climate innovator - creates comfortable, 

energy efficient indoor environments for com-

mercial and residential applications. For more 

information, please visit trane.com or 

tranetechnologies.com.

The AHRI Certified mark indicates Trane U.S. Inc. participation in 

the AHRI Certification program. For verification of individual certi-

fied products, go to ahridirectory.org.

Trane has a policy of continuous data improvement and it reserves 

the right to change design and specifications without notice. We 

are committed to using environmentally conscious print practices.

© 2020 Trane

18-AC104D1-1E-EN   01 May 2020  
Supersedes 18-AC104D1-1D-EN   (December 2019)

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

DEFROST

Unit  Won’t  Initiate  Defrost

Defrost Terminates  on Time

Unit  Icing  Up

WH

AT 

TO

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HE

CK

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OD

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PO

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PLY

HIG

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C
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P
P

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P
P
P
P
P
P

P
P
P
P

S
S

S
S

S
S

S
S
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S

S
S

S
S
S
S

S
S
S
S
S
S
S
S

S
S

S
S

P
P

P
P

S
S

S
S

P
P

P
P

S
S

P
P

P
P
P
P

P
P
P
P
P
P
P
P

S
S
S
S

S
S

S
S

P
P

P
P

P

P
P

P
P

P

P

P
P

P

P
P

P
P

P
P

P

S

S
S

S
S

S
S

P

S

S
S
S

S
S

S

S

S

S
S
S

S

S

S
S

P
P

S
S
S
S
S
S

S
S

S
S

S
S

P

P

P

P
P

P

S

S
S
S
S

S
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S
S

S
S
P
P

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S
S

S

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S

S

P

P

P
P
P

P
P

S
S

P P

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C  -  Cooling        H  -  Heating        P  -  Primary  Causes        S  -  Secondary  Causes       

*

  -  3  Phase  Only

15.2 Troubleshooting

Summary of Contents for 4TWR6

Page 1: ...pproved 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 outd...

Page 2: ...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 Li...

Page 3: ...f 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 1 The maximum length of refrigerant...

Page 4: ...ubbery 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 NOTE It is recommend...

Page 5: ...ing 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...

Page 6: ...ry Charge 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...

Page 7: ...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 w...

Page 8: ...e 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 Section 7 Refrigerant L...

Page 9: ...orrect direction of refrigeration flow away from outdoor unit and toward evapo rator coil as illustrated Braze the filter drier to the Liquid Line Continue the dry nitrogen purge Do not remove the wet...

Page 10: ...P 2 Check for leaks by using a soapy solu tion or bubbles at each brazed location Remove nitrogren pressure and repair any leaks before continuing Section 8 Refrigerant Line Leak Check 8 1 Check For L...

Page 11: ...ete blank off the vacuum pump and micron gauge and close the valves on the manifold gauge set 1 MIN Section 10 Service Valves 10 1 Open the Gas Service Valve 0350 Microns ON OFF CAP 1 4 TURN ONLY COUN...

Page 12: ...STEP 3 Replace the valve cap to prevent leaks Tighten finger tight plus an additional 1 6 turn Cap Rolled Edge to Captivate Stem Hex Headed Valve System Service Port 3 16 Hex Wrench Unit Side of Servi...

Page 13: ...Handler Outdoor Unit R G B W1 W2 R B O Y X2 R G B C O Y W Blue 24 VAC HOT FAN 24 VAC Common SOV COOL HEAT 1st STAGE HEATING 2nd STAGE EMERGENCY HEAT Pink Black White X2 O Y With TAM 4 5 7 9 Thermosta...

Page 14: ...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...

Page 15: ...Voltage Ground Ground the outdoor unit per national state and local code requirements LIVE ELECTRICAL COMPONENTS During installation testing servicing and troubleshooting of this product it may be ne...

Page 16: ...s to apply power to the indoor and outdoor units STEP 5 Set system thermostat to ON OFF DONE CANCEL ON OFF STEP 4 Wait one 1 hour before starting the unit if compressor crankcase heater acces sory is...

Page 17: ...ient tempera ture is above 55 F For best results the indoor temperature should be kept between 70 F to 80 F STEP 1 Use the refrigerant line total length and lift measurements from Section 5 3 Total Li...

Page 18: ...LINE LENGTH FEET REFRIGERANT LINE LIFT FEET 10 20 25 30 40 60 Add 4 of Subcooling Add 3 of Subcooling Add 2 of Subcooling Add 1 of Subcooling Use Design Subcool Value 60 50 40 30 25 20 15 10 0 SUBCOO...

Page 19: ...intersection of the Final Subcooling column and the Liquid Temperature row Special subcooling for application with TEM6 AH Table 14 2 8 9 10 11 12 13 14 179 182 185 188 191 195 198 195 198 201 204 208...

Page 20: ...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...

Page 21: ...___ 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 indoo...

Page 22: ...btained 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 mo...

Page 23: ...gainst 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 Importa...

Page 24: ...ime Unit Icing Up W H A T T O C H E C K M O D E P O W E R S U P P L Y H I G H V O L T A G E W I R I N G C O M P R E S S O R I O L R U N C A P A C I T O R S T A R T C A P A C I T O R S T A R T R E L A...

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