Trane TAMXB0A24V21DB Installation, Operation And Maintenance Manual page 70

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