SC Refrigeration Practice Questions - South Carolina Refrigeration Contractor Examination Exam

A compressor oil-failure (oil-pressure) control typically:

Closes immediately if net oil pressure is low for any fraction of a second at start Allows a timed delay (commonly on the order of 90–120 seconds) after start; if net oil pressure (oil pump minus crankcase) is still below the cut-out, it stops and locks out the compressor Measures only discharge pressure and ignores crankcase pressure Is not required on any pressure-lubricated semi-hermetic compressor

Correct Answer:

Allows a timed delay (commonly on the order of 90–120 seconds) after start; if net oil pressure (oil pump minus crankcase) is still below the cut-out, it stops and locks out the compressor

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