Question 6Refrigeration & AC - Assistant Engineer

The correct answer is C) Crankcase pressure regulator. During the initial cooling down of a refrigeration system, the crankcase pressure regulator is used to prevent excessive gas pressure at the compressor suction. This is to prevent overloading of the compressor driver, which could damage the system. The crankcase pressure regulator maintains a minimum pressure in the compressor crankcase to ensure adequate lubrication and prevent overloading. The other options are incorrect because: A) Low-pressure cutout is used to shut off the compressor if the suction pressure drops too low, B) Solenoid valve controls refrigerant flow, and D) High-pressure cutout shuts off the compressor if the discharge pressure gets too high.