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 18-AD43D1-1C-EN

Installer’s Guide

Is sub cooling at the

outdoor unit between

8 to 12F?

Troubleshooting Indoor TXV / Cooling Mode

NO

YES

Is superheat

< 5F?

YES

Correct air

flow

problem

Is air flow at least

350 CFM per ton?

YES

NO

Remove sensing bulb from the

suction line. Measure superheat

at indoor coil while holding the

bulb in bare hand for one minute.

Does superheat decrease?

Measure superheat at indoor coil

while placing the bulb in an ice

and water bath for one minute.

Does superheat increase?

YES

Replace the

TXV

TXV is OK

NO

Is superheat

< 25F?

YES

NO

Is indoor

temperature more

than 85F?

NO

Is sub cooling less

than 8F?

YES

Confirm that charge

is correct and look

for dirty or restricted

outdoor coil.

Confirm that

charge is

correct.

NO

Before starting

, insure the

blower wheel, indoor and outdoor

coils are clean.

Is the liquid line

temperature at indoor

coil within 8F of outdoor

liquid line temperature?

YES

Verify line set is

sized properly

for application

NO

The system is running at max

capacity and this may be

causing the High superheat.

Wait until indoor temperature

is less than 80F and check

superheat again.

YES

YES

Verify Inlet screen

of inlet tube

assembly is clear

of debris

NO

Verify Inlet screen

of inlet tube

assembly is clear

of debris

NO

Summary of Contents for 4PXCDU60BS3HAC

Page 1: ...dripping into the supply ductwork NOTE 4PXC upflow coils may be installed in Upflow Downflow Horizontal Right with kit and Horizontal Left with kit 4PXC downflow coils may be installed in Downflow and...

Page 2: ...rectly in front of the coil connections when removing sealing plugs If no pressure is released check for leaks 1 DOWNFLOW COIL CONVERSION On 4PXCDD60BS and 4PXCDU60BS installing the water diverter baf...

Page 3: ...ber plugs from the indoor coil 2 Field supplied tubing should be cut square round and free of burrs at the connecting end Clean the tubing to prevent contaminants from entering the system 3 Run the re...

Page 4: ...redofallinsulation 2 Insulate the primary drain line to prevent sweating where dew point temperatures may be met Optional depending on climate and application needs 3 Connect the secondary drain line...

Page 5: ...18 AD43D1 1C EN 5 Installer s Guide Outline Drawing for Upflow model 4PXCBU36BS3HAC 4PXCBD36BS3HDC 4PXCDU60BS3HAC 4PXCDD60BS3HDC From Dwg D346711 Rev B...

Page 6: ...NO Is superheat 25F YES NO Is indoor temperature more than 85F NO Is sub cooling less than 8F YES Confirm that charge is correct and look for dirty or restricted outdoor coil Confirm that charge is co...

Page 7: ...18 AD43D1 1C EN 7 Installer s Guide...

Page 8: ...plications For more information please visit www trane com or www americanstandardair com The manufacturer has a policy of continuous data improvement and it reserves the right to change design and sp...

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