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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
Compressor wiring defective
Close power supply start or disconnect
switch.
Compressor piston stuck
Replace compressor.
Shortage of refrigerant
Check for leaks, repair as required, recharge
Reset and check current (A) draw
Overload relay open
Unit short-cycles
Shortage of refrigerant (low pressure
Repair leak and recharge
cutout)
Evaporator fan rotating in wrong
Check DC motor polarity
direction
Restricted expansion valve (low
Replace expansion valve
pressure cutout)
Refrigerant overcharge (high
Recover excess refrigerant
pressure cutout)
Cycling on high pressure cutout
Check air flow and fan, clean coil, and check
switches
Clogged condenser coil
Clean coil
Unit operates long or
Shortage of refrigerant
Repair leak and recharge
continuously
Discharge compressor valve leaking
Replace compressor
Dirty condenser
Clean condenser
Air in system
Recover refrigerant, locate and repair leak,
test for leaks, and recharge
Poor compressor performance
Replace compressor
Plugged expansion valve
Clean or replace
Iced or plugged coil
Defrost or clean. Check coil for frost and
cleanliness. Check expansion valve. Check
for proper charge
Defective or damaged container
Repair container
insulation
Door open
Keep door closed
Load too warm
Precool hot product
Door seals leaking
Repair/replace
IC temperature too high
Refrigerant shortage
Recover refrigerant, locate and repair leak,
test for leaks, recharge
Setpoint set too high
Change set point
Expansion valve or strainer plugged
Clean or replace
Restricted lines
Replace line
Hot load
Precool hot product
Iced evaporation
Initiate manual defrost and check air flow
0028 00-3
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