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TM 55-1905-219-14-8
4-5. GENERAL (Continued).
Table 4-11. Air Conditioner Cooling Coil Troubles
Troubleshooting (Continued).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Solenoid coil burned out.
Check to see if coil responds to current. If not, replace coil.
Step 3.
Solenoid thermostat set too high.
Reset thermostat to maintain desired temperature.
Step 4.
Compressor not running.
Determine cause of compressor shutdown. Make any adjustments required and
restart.
Step 5.
Thermal expansion valve improperly set.
Reset expansion valve to 8 - 10superheat.
Step 6.
Thermal expansion valve remote bulb has lost its charge or improperly installed or
insulated.
Check installation and insulation of remote bulb. Visibly check bulb charge.
Step 7.
Thermal expansion valve orifice clogged.
Clean valve orifice with compressed air.
Step 8.
Stop valve in liquid line closed. Open valve.
4. Complete frosting of coil - failure to cool.
Step 1.
Fan not running.
Check switches, wiring, fuses, and thermostat. Correct any faulty condition.
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