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34
Desert Aire - LW Manual
Specific items should be noted before the replacement to give the best
indications of the failure and complete the diagnosis as the new compressor is
installed.
The following data should be taken to assist in diagnosis:
•
Current draw for each leg of power (if the compressor will run and
pump).
•
High side and low side pressure (if the compressor will run and pump).
•
Resistance of each leg to leg on three phase compressor or each leg
to neutral on single phase compressors.
•
Check of continuity from each leg to ground.
•
Review of all system alarms including the relative timing of the alarms
and mode of operation.
It is important to note that other components or lines may have been damaged
if the compressor has failed. At times the internal damage to a compressor
creates extreme levels of vibration before complete failure.
Refrigeration lines and connections may be damaged before the compressor
stops. Inspect tubing and components of the system before completing the
compressor replacement.
Compressor Replacement
•
Refrigeration oil must be tested for acid and particulate during any
compressor replacement. For the initial testing, the compressor sump
should be used to sample the oil. Oil can be recovered through the
Schrader port on the low point compressor shell or through the suction
line connection after the compressor has been removed.
•
Use Virginia KMP, New-Calgon Phase III, Sporlan Test-All, or
equivalent oil test where oil is sampled into a container. Vapor
sampling methods may not show particulate and should not be used.
•
Read the oil test kit manufacturer's instructions to determine if there is
acid present in the oil. Determine if there are other contaminants by
viewing the samples for darkness, cloudness, or particulate.
The following procedures must be used depending on the results of the test above:
Any Compressor Service
•
A new filter dryer must be installed when the system has been
opened. If there is no acid or particulates indicated, the new
compressor can be installed and run. Proceed to Testing and Final
Diagnosis.
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