To protect the compressor during periods of hot pull down, a(n) ____ valve is used.
A) TXV (thermostatic expansion valve)
B) EPR (evaporator pressure regulator)
C) CPR (crankcase pressure regulator)
D) LAC (low ambient control)

Question

Quizplus · Accepted Answer

During periods of hot pull down, the temperature in the evaporator may decrease at a faster rate than the refrigerant can boil off, leading to a buildup of pressure in the crankcase. This can cause damage to the compressor. The crankcase pressure regulator (CPR) is designed to prevent this by controlling the pressure in the crankcase and preventing it from rising too high. The other options, TXV, EPR, and LAC, are not designed for this specific purpose.

To Protect the Compressor During Periods of Hot Pull Down