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 A — Crankcase pressure regulator

A crankcase pressure regulator (holdback valve) is installed in the compressor suction line to limit suction pressure during initial pull-down, preventing excessive motor loads and electrical overload.