Specifications

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should be thoroughly cleaned or replaced before connecting to
replacement compressor.
4. Install new liquid line filter-drier. If the system has a suction line
filter-drier, replace the core.
5. Evacuate and dehydrate replacement compressor. Ensure oil in
compressor is at the proper level.
NOTE: Since most new and service compressors are now shipped
without oil in the crankcase, you must check to see if there is oil.
Adding or charging oil is usually easier prior to installing the
compressor.
• If there is no oil, add the appropriate oil for the service. Oil
charges are listed in Sections 3.1 to 3.3, pages 62-67.
• If there is oil, determine if it is compatible with the refrigerant.
If the oil is not compatible, use the drain connection to remove
the oil. Dispose of the removed oil following the appropriate
environmental guidelines. Since the compressor has not been
run, a thorough draining is all that is needed to remain within
the limits of residual oil levels. There is no need to “flush” the
compressor with the replacement oil. Once the oil is removed,
add the appropriate oil (see above).
6. Place compressor in operation. After 2 to 4 hours of operation,
inspect compressor oil for discoloration and/or acidity. If oil shows
signs of contamination, replace oil and filter-driers and clean the
suction strainer.
NOTE: When testing for moisture and acidity be sure the test kit
used is appropriate for the refrigerant (CFC, HCFC, or HFC) and
the oil (mineral, alkylbenzene, or POE) in the system. Carrier’s
Total Test Kit is accurate for CFC and HCFC air-conditioning
applications. If used with POE oils, Total Test Kit will indicate
acid, but is not an accurate indicator of moisture.
7. Inspect oil daily for discoloration and acidity. If oil stays clean and
acid-free, the system is clean. If oil shows signs of contamination,
change oil, change filter-drier, and clean suction strainer. If filter-
drier or suction strainer is dirty or discolored, repeat this step until
system is cleaned.