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ARMY TM 9-4120-381-14
NAVY EE-000- CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
Table 4-2. Unit Maintenance Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. EVAPORATOR AND CONDENSER FANS BOTH RUN, BUT COMPRESSOR DOES NOT START AFTER TIME
DELAY.
Step 1. Check operation of MODE SELECT SWITCH (S1) (para 4-56).
Set switch to OFF, then reset to COOL.
NOTE
Allow 60 seconds time delay before compressor starts.
WARNING
Disconnect input power before performing Internal electrical troubleshooting.
Voltage used can be deadly.
Step 2. Check for loose or damaged electrical connections, or damaged wires in wiring harnesses (see
Figure FO-3).
Tighten or replace connections and lugs. If wires are damaged, replace as necessary.
Step 3. Check operation of time delay relay (K22).
Test relay (para 4-54). Replace relay, if defective.
Step 4. Check operation of compressor contactor (K10).
Test contactor (para 4-52). Replace contactor, if defective.
Step 5. Check operation of compressor (B1).
If not operating, contact Direct Support Maintenance for refrigeration system troubleshooting.
3. COMPRESSOR STARTS NORMALLY, BUT CONTROL CIRCUIT BREAKER (CB1) SOON TRIPS.
Check circuit breaker (CB1).
Test circuit breaker (para 4-62). Replace circuit breaker if defective. Restart air conditioner in COOL
mode.
CAUTION
If circuit breaker trips again soon after restart in COOL mode, do not attempt
another restart, damage may occur to compressor. Contact Direct Support Main-
tenance for refrigeration system troubleshooting.
4. REDUCED COOLING CAPACITY.
Step 1. With unit operating in COOL mode, check condition of refrigerant in sight glass (Table 4-1, item 28).
a. Check sight glass (Table 4-1, item 28).
b. Clean condenser coil (para 4-90).
Step 2. Check operation of cool control thermostat (SI4).
Test thermostat (para 4-87). Replace thermostat, if defective.
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