Trane 4TWA7 Installer'S Manual Download Page 24

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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

T T

K M

PLY

HIG

H V

OLT

E W

IRIN

N C

APA

CIT

STA

APA

CIT

STA

NTA

TAC

LTA

IRIN

L T

STA

NTA

OIL

LTA

K C

INE

ICIE

F. U

F. O

IVE

P. L

O.D

. A

IRF

O.D

. A

CIR

LAT

V/E

EAT

I.D

. A

IRF

F. C

IR.

RIC

TIO

V L

KIN

V C

OIL

TIV

K V

ALV

E L

KIN

T R

EF.

T C

EF.

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

C
H
C
H
C
H

P
P

P
P
P
P
P
P

P
P
P
P

S
S

S
S
S
S

S
S

S
S
S
S

S
S
S
S
S
S
S
S

S
S

P
P

S
S

P
P

S
S

P
P

P
P
P
P

P
P
P
P
P
P
P
P

S
S
S
S

S
S

P
P

S
S

S
S
S

S
S

S
S
S

S
S

P
P

S
S
S
S
S
S

S
S

P
P

S
S
S
S

S
S

S
S
P
P

S
S

P
P
P

P
P

S
S

P P

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

- 3 Phase Only

15.2 Troubleshooting

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.

04/16

Summary of Contents for 4TWA7

Page 1: ...pproved matched indoor and outdoor systems All of the manufacture s split systems are AHRI rated only with TXV EEV indoor systems Some of the benefits of installing approved matched indoor and out doo...

Page 2: ...ponent replacement For specific handling concerns with R 410A and POE oil reference Retrofit Bulletins SS APG006 EN and APP APG011 EN or APP APG012 EN Extreme caution should be exercised when opening...

Page 3: ...sions and Weight Models H x D x W in Weight lb 4TWA7036A3 4 45 x 34 x 37 245 4TWA7048A3 4 45 x 34 x 37 265 4TWA7060A3 4 45 x 34 x 37 265 Weight values are estimated 1 The maximum TOTAL length of refri...

Page 4: ...areas where snow accumulation and prolonged below freezing temperatures occur Units should be elevated 3 12 inches above the pad or roof top depending on local weather This additional height will all...

Page 5: ...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 h...

Page 6: ...4 7 8 3 8 7 8 3 8 150 50 4TWA7060A3 4 1 1 8 3 8 7 8 3 8 80 25 ALTERNATE LINE SIZES Line Sizes Service Valve Connection Sizes Max Line Lift Lengths Vapor Line Liquid Line Vapor Line Connection Liquid L...

Page 7: ...line length and lift You will need this later in STEP 2 of Section 14 Total Line Length __________ Ft Total Vertical Change lift __________ Ft Trane outdoor condensing units are factory charged with...

Page 8: ...rom 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 wh...

Page 9: ...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 10: ...ier check liquid line filter drier s directional flow arrow to confirm correct direction of refrigeration flow away from outdoor unit and toward evapo rator coil as illustrated Braze the filter drier...

Page 11: ...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 Le...

Page 12: ...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 13: ...ve System Service Port 3 16 Hex Wrench Unit Side of Service Valve Extreme caution should be exercised when opening the Liquid Line Service Valve Turn counterclockwise until the valve stem just touches...

Page 14: ...to the service information in control box Defrost Board Detail Jumper J2 J5 Test Pins 11 3 Defrost Control With TEM 6 Thermostat Air Handler Outdoor Unit R G B W1 W2 R B O X2 R G B C B C O Y1 W Blue...

Page 15: ...gh 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...

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: ...ent 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 Lin...

Page 18: ...NG CHART CORRECTIONS TABLE FOR LINE LENGTH AND RISE Add 2 REFRIGERANT LINE LIFT FT 4 Ton Heat Pump 50 1 40 1 30 25 Use Design Subcooling 15 10 0 20 30 40 50 60 70 80 90 100 110 120 130 140 150 REFRIGE...

Page 19: ...essure should be ap proximately 327 PSIG This is the shown as the intersection of the Final Subcooling column and the Liquid Temperature row Table 14 2 8 9 10 11 12 13 14 179 182 185 188 191 195 198 1...

Page 20: ...OR 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 IND...

Page 21: ...eating Only Measured Suction Line Temp __________ F Liquid Gage Pressure __________ PSIG Suction Gage Pressure __________ PSIG Calculating Charge Using the Weigh In Method 1 Measure in feet the distan...

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: ...A R G E E X C E S S I V E E V A P L O A D N O N C O N D E N S A B L E S R E S O D A I R F L O W O D A I R R E C I R C U L A T I O N T X V E E V S T U C K O P E N S U P E R H E A T R E S I D A I R F L...

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Trane 4TWA7, Installer'S Manual

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