Compressor oil return in an air conditioning or refrigeration system is super important. Oil failure controls are implemented on larger semi hermetic compressors that utilize oil pumps to ensure the compressor is receiving the oil it needs to function. Mechanical oil failure controls are very simple in the way they operate but do confuse some technicians. I have seen too many oil failure controls get misdiagnosed and replaced when in fact it was an oil return issue causing the problem.
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