SC Refrigeration Practice Questions - South Carolina Refrigeration Contractor Examination Exam

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Suction-line diameter is selected so that vapor velocity is high enough to return oil but not so high that pressure drop (and therefore capacity loss) is excessive. If a suction line is greatly oversized for the load:

Oil return improves and capacity always increases Velocity falls, oil may not return, and the compressor can run low on oil The TXV will automatically compensate by raising head pressure Flash gas in the liquid line is eliminated

Correct Answer:

Velocity falls, oil may not return, and the compressor can run low on oil

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