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Page Title:
Table 1. Troubleshooting Procedures - Continued |
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 TM 9-4120-425-14&P
DIRECT SUPPORT TROUBLESHOOTING PROCEDURES - Continued
0047-00
Table 1. Troubleshooting Procedures - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7.
COMPRESSOR RUNS BUT
6.
Check for high discharge
Bleed off excess refrigerant.
DOES NOT COOL - Continued
pressure. (Refer to Table 1, WP
7.
Check operation of liquid
1.
Check continuity of solenoid coil.
solenoid valve. Unit may be in
Replace defective coil.
standby operation.
2.
Cycle equipment several times.
3.
Perform refrigeration system
pressure testing for low or
expected discharge pressure.
Refer to WP 0055-00 for pressure
testing.
Check for low suction line
8.
COMPRESSOR EXCESSIVELY
1.
Listen for knocking.
temperature indicating that liquid
NOISY
refrigerant is returning to compressor.
(Refer to WP 0055-00 and Table 1,
1.
Bleed off excess refrigerant.
2.
Check for high discharge
pressure indicating overcharge of
2.
Check HIGH pressure switch.
refrigerant. (Refer to WP 0055-00
and Table 1, WP 0055-00.)
Refer to schematic diagram (WP
3.
Check three phase power
sequence, must be A-B-C for
proper compressor rotation.
9.
SUCTION PRESSURE TOO
1.
Stop compressor and check
1.
Remove remote bulb in suction
LOW
expansion valve.
line.
2.
Place bulb in ice water for 1-2
minutes.
3.
Start compressor.
0047-00-5
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