AZ ROC C-39 Air Conditioning And Refrigeration Practice Questions - Arizona ROC C-39 CR-39 R-39R Air Conditioning And Refrigeration Examination Exam

What is the primary function of a compressor crankcase heater in a commercial air conditioning or refrigeration system?

To increase discharge gas superheat during normal compressor operation To heat the suction gas prior to entering the compressor cylinders to boost volumetric efficiency To prevent liquid refrigerant migration to compressor crankcase oil during the off-cycle To melt ice accumulation on the compressor shell during low-ambient cooling

Correct Answer:

To prevent liquid refrigerant migration to compressor crankcase oil during the off-cycle

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