Question 21Refrigeration & AC - 1st Asst/Chief

The correct answer is B) Crankcase pressure regulator. The crankcase pressure regulator is used to prevent excessive gas pressure at the compressor suction during the initial cooling down of a refrigeration system. This helps prevent overloading of the compressor driver by maintaining the suction pressure within safe operating limits. The other options are not correct: A) High-pressure cutout is used to protect the system from excessive discharge pressure, C) Low-pressure cutout is used to protect the compressor from operating at too low a suction pressure, and D) Solenoid valve is used to control the flow of refrigerant, not specifically to regulate suction pressure.