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TM 5-4120-361-14
Table 3-1.
Troubleshooting .
1.
AIR CONDITIONER FAILS TO OPERATE
Step 1.
Check to see if main power cord is plugged in.
Connect power cable to receptacle (fig. 2-1) supplying 208 VAC,
3 phase power of the proper frequency.
Step 2.
Check to see if compressor circuit breaker is in OFF position.
Reset circuit breaker (fig. 2-1).
Step 3.
Check to see if mode selector switch is in OFF position.
Turn selector switch to desired operation (fig. 2-1).
Step 4.
If air conditioner still is inoperative, report condition to
organizational maintenance.
2.
INSUFFICIENT COOLING
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Step 8.
Check to see if mode selector switch is in proper
Set switch to COOL (fig. 2-1).
Check to see if temperature selector switch is in
Adjust setting to COOLER (fig. 2-1).
position.
correct position.
Check to see if sufficient air is passing over evaporator coil.
Open evaporator inlet louvers (fig. 2-1).
Remove any obstructions
from evaporator inlet and outlet louvers.
Inspect for clogged air filter.
Report clogged filter condition to organizational maintenance.
Check to see if too much outside air is entering unit.
Close or adjust damper door (fig. 2-1).
Check to see if the system contains sufficient refrigerant by
inspecting liquid sight indicator (para 3-8).
Report low refrigerant condition to direct support maintenance.
Check to see if evaporator fan speed switch is set to LOW speed
position.
Reset switch to HIGH speed position (fig. 2-1).
Check to see if sufficient air is passing through condenser coil.
Remove any obstructions from condenser fan inlet and outlet.
3-2
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