60
• 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. Refrigerant 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, cloudiness, 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. See Section 5.6 for
component replacements. If there is no acid or particulates indicated, the new compressor can
be installed and run. Proceed to Testing and Final Diagnosis.
Acid Indicated
• Install a suction line filter shell and charcoal activated core such as a Sporlan or Emerson HH
core type or equivalent. The acid levels will be monitored and several core changes may be
required. Install ball valves on either side of the suction filter to facilitate these changes. Note
that larger Desert Aire systems will have suction filter shells installed from the factory. The shell
can be used with charcoal activated cores. Note that a “safety screen” may be required with
some manufacturer’s cores to prevent small pieces of the core from dislodging and finding their
way to the compressor. Follow filter shell and core manufacturer’s instructions.
• Review compressor and suction line for an area where future oil samples can be taken from the
system. If an access fitting exists on the compressor shell below the oil level, no further action
is needed. If this is not available, an access fitting can be located at the bottom of a trap in the
suction line. Braze in a fitting as required to be able to remove an oil sample.
• Ensure there are access fittings directly upstream and downstream of the suction filter. There is
typically one fitting installed on the suction filter. There may be a bulkhead fitting attached to the
compressor suction side.
Desert Aire - SA Manual
Summary of Contents for SA Series
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