Question 21Refrigeration & AC - 1st Asst/Chief
70% to passDuring the initial cooling down of a box temperature in a refrigeration system, which of the devices listed is used to prevent excessive gas pressure at the compressor suction for the purpose of prevention of overloading of the compressor driver?
AHigh-pressure cutout
BCrankcase pressure regulator
CLow-pressure cutout
DSolenoid valve
AI Explanation
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.
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