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5
Appendix
5.1
Compressor Failure
Although most compressors fail because they are mechanically flawed, most failures are
due to system-related problems. Compressor failure can be caused by liquid flood back,
air/moisture in the refrigeration system, solid contaminants, excessive heat or electrical
service malfunctions. To avoid repeated callbacks, the cause of the failure must be
determined and corrected.
If the compressor has failed because its motor has burned out, the refrigerant, oil, and
piping may have become severely contaminated. If a burnout has occurred, use the
following procedures to replace the compressor and clean the refrigerant system. Use an
oil test kit to determine the severity of the burnout. Make sure you use rubber gloves and
eye protection, as contaminated refrigerant and oil can cause severe burns!
You must clean the system thoroughly to prevent repeated compressor burnouts.
5.1.1
Compressor Replacement
Desert Aire dehumidifiers are designed with scroll compressors. Scroll compressors
are known for operating more reliably than other compressors in air conditioning and
dehumidification applications due to their ability to cope with occasional periods of
liquid refrigerant return. There are fewer moving parts in a scroll compressor subject
to wear compared to alternative compressor designs. Nonetheless, there are still
many mechanical and electrical parts with close tolerances. Replacement of the
compressor may be required during the normal service life of the dehumidifier.
Inspection and Initial Diagnosis
Generally, the compressor will have two basic failure modes, mechanical or
electrical. The compressors are a hermetic design, meaning all components,
including the motor, are in a sealed shell. It can be very difficult to determine which
issue was the root cause of the failure in the field by inspection of the damaged
compressor. For example, an initial bearing failure inside the compressor may create
debris that contaminates motor windings. High current draw may be related to a
bearing issue or a motor winding issue. The initial inspection must be combined with
a final analysis of the machine when returned to working order to conform diagnosis.
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Desert Aire - LW Manual
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