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 TM 55-1905-223-24-17
Table 2-2. Troubleshooting - CONT
Malfunction
Test or Inspection
Corrective Action
AIR CONDITIONING - CONT
12.
High crankcase temperature (compressor extremely hot).
WARNING
Shock Hazard. Wear protective gloves when checking voltage.
STEP 1.
Check for low voltage or dirty electrical contacts in contactor.
a.
Check voltage to the unit (paragraph 2-15). Refer to Table 1-6 for voltage rating.
b.
Clean dirt or oil from contact points with soft rag.
c.
Replace contactor if points are burned or pitted.
13.
Extremely hot liquid line.
STEP 1.
Check for high operating head (discharge) pressure (A/C-2).
Refer to Item 8 of this table.
14.
Cold or frosted liquid line (or component in the liquid line).
STEP 1.
Check for low operating head (discharge) pressure (A/C-2).
Refer to Item 9 of this table.
15.
Compressor will not start.
STEP 1.
Check to see if power is OFF or operating thermostat set too high.
Check main switch and thermostat. Turn power ON or set thermostat to lower setting as
required.
STEP 2.
Check to see if control circuit breaker is OFF or tripped.
Reset circuit breaker. If it keeps tripping, check the control circuit for a short and correct as
required.
WARNING
Turn electrical power OFF.
STEP 3.
Check for loose electrical connections or faulty wiring.
a.
Make sure all electrical connections are tight.
b.
Check for burned or broken wiring. Correct as required.
2-23
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