Quote:
Originally Posted by leathermang
Refrigerator compressors are a CLOSED LOOP system...just like our Cars...
the compressor Depends on the recirculated OIL to keep it lubricated....
so don't spend any time fixing up one ...
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This is true, but when plumbed for air or vacuum use, the crankcase oil loss is minimal. I have seen them in use for years with no oil loss.
Refrigerant dissolves the oil, and it moves with the charge. Nitrogen and air don't.
And when used for vacuum, the gas velocity is so small that very little oil moves.