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Page Title:
Refrigeration System Operating Problems (Cont) |
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 TM 10-4110-262-13&P
0028 00
Condition
Possible Cause
Remedy
Head pressure too high
Refrigerant overcharge
Recover excess refrigerant
Air in system
Recover refrigerant, locate and repair leak,
test for leaks, recharge
Dirty condenser
Clean condenser
Restricted condenser
Clean condenser
Condenser fan not running
Check fan motor. Check fan control circuit.
Condenser fan rotating backwards
Check fan motor polarity
Head pressure too low
Refrigerant shortage
Recover refrigerant, locate and repair leak,
test for leaks, recharge
Bad compressor suction or
Replace compressor
discharge valves
Noisy compressor
Insufficient compressor oil
Add oil to proper level
Mounting bolts loose
Tighten
Refrigerant flooding back
Adjust refrigerant charge. Check expansion
valve for proper superheat
Frosted or sweating
Frosted evaporator coil
Initiate manual defrost
suction line
Evaporator airflow restricted
Clean evaporator coil and inspect evaporator
fan.
Frosted liquid line
Restricted dehydrator or receiver
Replace restricted part
tank
Condenser coils cool when
Refrigerant undercharge
Check refrigerant charge. If low, recover
unit is cooling
refrigerant, locate and repair leak, test for
leaks, recharge
Compressor inefficient
Replace compressor
Unit in vacuum. Frost on
Ice plugging expansion valve orifice
Apply hot wet cloth to expansion valve.
expansion valve only
Moisture indicated by increase in suction
pressure. Replace dehydrator.
Plugged expansion valve strainer
Clean strainer or replace expansion valve
Sensor bulb lost charge
Replace expansion valve
Low refrigerant
System is undercharged
Adjust charge.
Leak in system
Repair leak.
0028 00-4
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