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Air Conditioning Compressor Oil Diagnosis

Condition

Corrective Action

Note: To avoid repeat compressor failure, always inspect the condition of the refrigerant oil and take the appropriate corrective action before installing the replacement compressor.

Clean oil no debris present

No corrective action necessary.

Clean oil with debris present

    • Inspect the suction port of the replacement compressor for presence of a suction screen. If the replacement compressor does NOT contain a suction screen, install a suction screen in the line.
    • Replace the desiccant or component containing the desiccant.
    • Replace the desiccant filter if applicable.
    • Remove and inspect the high pressure side filter (if applicable).
    • Remove, inspect, clean, or replace the orifice tube.
    • If the system has a front orifice tube and is equipped with a filter in the rear auxiliary line, remove, inspect, clean, or replace the filter.

Dark brown/black and/or pungent/unusual odour with no debris present

    • Replace the desiccant or component containing the desiccant.
    • Replace the desiccant filter if applicable.
    • Flush the refrigerant system.

Dark brown/black and/or pungent/unusual odour with debris present

    • Replace the desiccant or component containing the desiccant.
    • Replace the desiccant filter if applicable.
    • Flush the refrigerant system.
    • Inspect the suction port of the replacement compressor for presence of a suction screen. If the replacement compressor does NOT contain a suction screen, install a suction screen.
    • Remove and inspect the high pressure side filter if applicable.
    • Remove, inspect, clean, or replace the orifice tube.
    • If the system has a front orifice tube and is equipped with a filter in the rear auxiliary line, remove, inspect, clean, or replace the filter.

Oil overcharge

Flush the refrigerant system.

Refrigerant contamination

Flush the refrigerant system.

Hybrid polyester refrigerant oil (POE) contamination

    • Flush the refrigerant system.
    • Replace the desiccant or component containing the desiccant.
    • Replace the desiccant filter if applicable.
   


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