TM 9-4120-388-14
Table 4-2. Unit Troubleshooting (Cont.)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Be sure that condenser fan is operating. (Air being discharged from condenser air outlet).
NOTE
If one fan is operating and the other is not, check for loose fan on motor shaft. If both fans
are not operating, check for loose electrical connections, defective motor relay (K4), or
defective motor (B2).
Step 4. With unit operating in COOL mode, check condition of refrigerant in sight glass.
If indicator color is in the yellow zone or numerous bubbles appear in the window, turn selector switch
to OFF and notify your supervisor.
Step 5. Reset (PUSH) PRESSURE CUT-OUT switch(s) and restart unit.
If unit does not start notify your supervisor.
5. REDUCED COOLING CAPACITY.
Step 1. Be sure that all doors, windows, and other openings in the room or enclosure are tightly closed.
Tightly dose all openings.
Step 2. Check operation of Temperature control thermostat.
Set control at maximum DECREASE; then, if condition improves, adjust properly.
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