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TM 5-4120-361-14
Table 4-2.
Troubleshooting - Continued
2.
INSUFFICIENT COOLING - Continued
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Step 9.
Step 10.
Step 11.
Check to see if fresh air damper control is incorrectly set or
improperly adjusted.
Verify setting and, if necessary, correct adjustment of damper
control (para 4-39).
Check to see if evaporator outlet louver is bent or stuck in
closed position.
Repair or replace louver.
(para 4-7)
Inspect condenser coil for dirt accumulation.
Clean coil (para 4-5).
Inspect evaporator return air filter for dirt accumul
Clean filter (para 4-3).
Check to see if evaporator fan is loose or defective.
ation
Tighten if loose or replace if defective (para 4-21).
Check evaporator fan motor for a defective thermal protective
device.
Replace thermal protector (para 4-22).
Check to see if evaporator fan motor is worn or defective.
Report deficiency to direct support maintenance or replace motor
(para 4-21).
Check refrigerant system for insufficient charge by inspecting
liquid sight indicator.
Presence of bubbles indicates a low
refrigerant charge.
Report low-charge condition to direct support maintenance.
Check for intermittent compressor operation.
Report condition to direct support maintenance.
3.
EVAPORATOR OR CONDENSER FAN FAILS TO OPERATE
Step 1.
Check to see if main power cable is connected.
Connect cable to power source.
Step 2.
Check to see if main power receptacle or plug connectors are
defective.
Replace connectors or receptacle.
4-10
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