When retrofitting a self-contained reach-in refrigerator with a hermetic compressor from R-12 to R401A, must the compressor oil be changed from mineral to alkylbenzene?
a. Yes, you must always change from mineral oil to alkylbenzene on a retrofit.
b. No, an oil change is not necessary when retrofitting close-coupled systems.
c. It depends on the amount of refrigerant used.
b. No, an oil change is not necessary when retrofitting close-coupled systems.
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