Trane TAMXB0A24V21DB - Page 70

70
18-GJ89D1-1F-EN
Troubleshooting Low Superheat - page 2
P2
STEP 4
Correct stepper
motor installed
No
Replace stepper
motor and retest for
Low Superheat
System has
proper
Superheat
Yes
To
A
Yes
No
STEP 5
Connector J1
wired correctly
No
Connector wiring
can be corrected
Yes
Correct wiring and
retest for Low
Superheat
Yes
No
No
Yes
System has
proper
Superheat
To
A
STEP 6
Cycle system
power and check
subcooling
STEP 7
Subcooling
is high
Yes
Adjust to
specifications
prescribed in OD
Service Facts and
retest for Low
Superheat
System has
proper
Superheat
Yes
To
A
No
No
Sucooling is low
Yes
Add refrigerant per
specifications
prescribed in OD
Service Facts
Subcooling is low
No
No
Yes
P3
Note that adding
refrigerant did not
effect subcooling
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