During 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?

Correct Answer: Option B — Crankcase pressure regulator

Crankcase pressure regulators, or back-pressure valves, restrict vapor flow from the evaporator during high-load pull-down conditions, preventing excessive suction pressures from overloading the compressor motor and driver.