Trane AM7A0C36H31SA - Low Superheat Troubleshooting; Blower, Filter, and Coil Checks; EEV Valve and Coil Resistance Tests

19 AM7A0C36H31-SF-1A
LOW SUPERHEAT
Superheat below 3F at OD unit
Start Here
Is indoor blower
running?
Verify field wiring
is correct. See
CTM motor trouble
shooting
NO
Is filter, coil,
and blower
wheel clean?
YES
Clean or replace
as needed
NO
Perform sensor
check
YES
Perform “CLOSE
VALVE” test at
EVC.
Does suction
pressure drop?
Perform “OPEN
VALVE” test at
EVC.
Does suction
pressure rise?
Replace EVCYES
Replace EVCYES
Replace EEV.
Check operation
Ohm coil per FIG1
Is ohm reading
correct?
YESReplace coil NO
NO
NO
4 - Phase Coil Control
Figure 1
4 - BLUE
5 - BROWN (COMMON)
6 - RED (COMMON)
3 - ORANGE
2 - YELLOW
1 - WHITE
● Brown (common) to Blue or Yellow should measure 46 ohms
● Red (common) to Orange or White should measure 46 ohms