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TM 5-4120-377-14
Table 4-2. TROUBLESHOOTING (Cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. CONDITIONED AIR (EVAPORATOR) AND CONDENSER FANS BOTH RUN, BUT COMPRESSOR DOES
NOT START AFTER TIME DELAY.
Step 1. Check to see if HIGH or LOW PRESSURE CUT-OUT switch has tripped.
PUSH and release TO RESET.
Step 2. Check operation of mode selector switch.
Turn switch to OFF, the reset to COOL.
NOTE
Allow 30 seconds time delay before compressor starts.
Disconnect input power before performing internal electrical troubleshooting.
Voltages used can be deadly.
Step 3. Check for loose or damaged electrical connectors, or damaged wires in wiring harnesses.
Tighten or replace connectors, or repair damaged wires.
Step 4. Cheek operation of time delay relay (K3).
Test relay. (See para 4-54.) Replace relay if defective.
Step 5. Check operation of compressor motor relay (K1).
Test relay. (See para 4-55.) Replace relay if defective.
Step 6. Check operation of circuit breaker (CB1) primary contacts.
Test circuit breaker. (See para 4-51.) Replace circuit breaker if defective.
Step 7. Check operation of compressor (B1).
If not operating, contact direct support maintenance.
4-41
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