Technician A says if the suction line to the compressor is covered with thick frost, this might indicate that the expansion valve is flooding the evaporator. Technician B says the formation of frost on the outside of a line or component means there is a restriction to the flow of refrigerant. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because a suction line covered with thick frost can indicate that the expansion valve is allowing too much refrigerant to flow into the evaporator, causing it to flood. Technician B is also correct because frost formation on the outside of a line or component often indicates a restriction in the refrigerant flow, which causes a drop in temperature and leads to frost buildup.

Technician a Says If the Suction Line to the Compressor