ARMY TM 9-4120-380-14
NAVY EE-000-BA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-21
Table 4-2. Unit Maintenance Troubleshooting - Continued
Malfunction
Test or Inspection
Corrective Action
3
COMPRESSOR STARTS NORMALLY, BUT CONTROL CIRCUIT BREAKER (CB1) SOON TRIPS
Step 1. Check circuit breaker (CB1).
Test circuit breaker (paragraph 4.39) Replace circuit breaker if defective. Restart air conditioner in COOL
mode.
If circuit breaker trips again soon after restart in COOL mode, do not
attempt another restart, damage may occur to compressor. Contact
Direct Support Maintenance for refrigeration system troubleshooting.
4
REDUCED COOLING CAPACITY
Step 1. Check that all doors, windows and other openings in the room or enclosure are tightly closed.
Tightly close all openings.
Step 2. Check operation of thermostat (S2).
Test thermostat (paragraph 4.54). Replace thermostat if defective.
Step 3. Check to be sure that condenser air inlet and outlet are not obstructed (paragraph 1.9)
Remove obstructions.
Step 4. With unit operating in COOL mode, check condition of refrigerant in sight glass (table 4-1, Item 14).
a.
Check sight glass (table 4-1, Item 14).
b.
Clean evaporator coil (paragraph 4.60).
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