Trane TAMXB0A24V21DB Installation, Operation And Maintenance Manual page 71

P3
STEP 8
Perform Close
ValveTest from
Diagnostics Mobile App
STEP 9
Ohm Coil per
StepperMotor Tables
46 ohms are
present across all
terminal pairs
Yes
STEP 10
Perform Frost Test
STEP 11
Perform External
Check Valve Test
System has
proper
Superheat
No
Perform Frost Test
Troubleshooting Low Superheat process is complete,
clear all Fault Codes. If Low Superheat condition
has NOT been resolved, contact your FSR
18-GJ89D1-1F-EN
Troubleshooting Low Superheat - page 3
Suction pressure
drops
No
Replace Stepper
Motor and retest for
No
Low Superheat
No
All Distributors
frost equally
No
Replace Tube
Yes Assembly and Check
Valve
All Distributors
frost equally
Yes
A
or local distributor for further assistance
Yes
System has
proper
Superheat
To
Yes
A
1 Frost Test Procedures
1. Remove Coil panel.
2. Remove Sensor harness from Connector J3 on
Electronic Expansion Valve Control Board.
3. Run System cooling in highest stage available.
4. Observe frost pattern on all Distributor tubes.
2 Check Valve Test Procedure
Warning: This procedure is destructive and could require
repair or replacement of Valve Assembly following test.
1. Run System cooling in highest stage available for 15-20 minutes.
2. Pinch off Liquid Line between Check Valve and Distributor Assembly where
applicable.
3. When Valve is fully crimped measure Superheat.
To
A
No
T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
To
A
To
Yes
A
Replace Coil
71