TM 9-4120-407-14
Table 3-3. Unit Troubleshooting Table
MALPUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. AIR CONDITIONER DOES NOT START IN ANY MODE.
Liquid refrigerant will collect in the compressor during cold weather.
Compressor damage can result if operated before it has warmed
enough to boil the liquid out.
Step 1. Check that input power cable is connected to air conditioner and a source of 208 volt, 50/60 or
400 hertz, three phase power.
VOLTAGES USED IN THIS EQUIPMENT CAN KILL.
The following test is conducted with the power on. Exercise extreme
caution to avoid injury.
Connect input power cable to air conditioner and power source per paragraph 3-6. During
cold weather, wait at least 30 minutes before operating in cooling mode.
The circuit breaker will trip off if the unit draws excessive
amperage. Equipment damage can result if the circuit breaker is
repeatedly reset without correcting the cause of the excessive amp
draw.
Step 2. Check to see if circuit breaker handle (1) has tripped to OFF position.
Move circuit breaker handle to ON position.
Step 3. Check to see if the control panel assembly (2) is loose.
Tighten the control panel assembly mounting screw.
3-50