NATE LC Refrigeration Practice Questions - NATE Light Commercial Refrigeration Service Specialty Exam

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When installing a horizontal suction line that rises to an evaporator above the condensing unit, why should a P-trap be installed at the base of the riser?

To collect oil so it can be carried up the riser by refrigerant vapor velocity To slow refrigerant flow and increase subcooling To prevent liquid refrigerant from flooding the receiver To equalize pressure during the off cycle

Correct Answer:

To collect oil so it can be carried up the riser by refrigerant vapor velocity

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