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TM 10-4110-262-13&P
0028 00
8. Air in the System - Air is not condensable. Its presence in the system increases head pressure.
When the compressor is stopped, air will gather at the high point of the high side. Evacuate the
system.
9. Temperature of the Liquid Line - During normal operation, the liquid line will be slightly warmer than
the surrounding air. An extremely hot line indicates either a shortage of refrigerant or a plugged
condenser coil. A cold line indicates a restriction, and some flashing may take place in the liquid line
sight glass.
10. Restricted or Wet Dehydrator - If the outlet line of the dehydrator is colder than the inlet line, the
dehydrator is either saturated with moisture or is dirty and must be replaced.
11. Dirt in the Expansion Valve Screen Perform a low side pump down. Remove the screen and
clean. If the moisture is in the refrigeration system, it will collect at the expansion valve and freeze.
This is indicated by abnormally low suction pressure. Clean the system, replace the dehydrator,
pressurize and check for leaks, and evacuate the low side. Return the unit to normal operation.
12. Ice on the Evaporator Coil - Run the unit through a manual defrost cycle to remove the ice.
13. Air Flow - Do not load product directly in front of the evaporator air return or discharge. Ensure that
the condenser air inlet and discharge areas are clear of obstruction. Ensure that the fans (evaporator
and condenser) are correctly positioned in their respective openings and operating to achieve
maximum airflow.
14. Compressor Life - The following conditions will shorten the life of a compressor:
Operating a contaminated system
Clogged expansion valve screen
Defective high pressure or low pressure switches
Insufficient oil charge
Wrong oil or mixed oil
Insufficient refrigerant charge
Refrigeration System Operating Problems
Operating problems may result from a faulty refrigeration system component or a problem in the control
system. Use the following table to diagnose and repair problems in the refrigeration system.
Troubleshooting procedures for the ADR-300 control system are presented in the next section.
Condition
Possible Cause
Remedy
Compressor does not run
Improperly wired
Check wiring against diagram.
Low line voltage
Check line voltage-determine location of
voltage drop
Defective control circuit
Check and replace relay if defective. If not,
check control circuit
Open circuit in motor winding
Check motor and continuity between
windings and check for grounded windings.
If open, replace motor
0028 00-2

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