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TM 5-4120-352-14
TROUBLESHOOTING
Section III.
Operator's  Troubleshooting
3-6.
3-5.
General.
Chart.
This section contains information that is useful
Troubleshooting procedures for operator-crew
in diagnosing and correcting troubles which cause
are listed in table 3-2.
unsatisfactory operation or failure of the air
conditioner.
Table 3-2. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
1. AIR CONDITIONER FAILS TO OPERATE
Step 1. Check to see if main power cord is plugged in.
Connect power cable to receptacle (fig. 2-3, Sheet 1), supplying 208 VAC, 3 phase, 50-60 hz power.
Step 2. Check to see if compressor circuit breaker is in OFF position.
Reset circuit breaker (fig. 2-3, Sheet 1).
Step 3. Check to see if mode selector switch is in OFF position.
Turn selector switch to desired operation (fig. 2-3, Sheet 1).
2. INSUFFICIENT COOLING
Step 1. Check to see if mode selector switch is in proper position.
Set switch to COOL (fig. 2-3, Sheet 1).
Step 2. Check to see if temperature selector switch is in correct position.
Adjust setting to COOLER (fig. 2-3, Sheet 1).
Step 3. Check to see if sufficient air is passing over evaporator coil.
Open evaporator inlet louvers (fig. 2-4). Remove any obstructions from evaporator inlet and outlet
louvers.
Step 4. Check to see if too much outside air is entering unit.
Close or adjust vent (fig. 2-3, Sheet 2).
Step 5. Check to see if the system contains sufficient refrigerant by inspecting liquid sight indicator (para 3-10).
Report low refrigerant condition to direct support maintenance.
Step 6. Check to see if evaporator fan speed switch is set to LOW speed position.
Reset switch to HIGH speed position (fig. 2-3, Sheet 1).
Step 7. Check to see if sufficient air is passing through condenser coil.
Remove any obstructions from condenser fan inlet and outlet.
3. NO HEAT OR LOW CAPACITY HEAT
Step 1. Check to see if mode selector switch is properly set.
Set switch to LOW HEAT or HIGH HEAT (fig. 2-3 Sheet 1).
Step 2. Check to see if temperature selector switch is set correctly.
Adjust to WARMER setting (fig. 2-3, Sheet 1).
Step 3. Check for insufficient air movement over heaters.
Remove any obstructions from evaporator air intake and discharge louvers. Make sure intake louvers
are open (fig. 2-3, Sheet 2).
3-2

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