As shown in the illustrated LP centrifugal chiller high efficiency purge recovery unit piping schematic, what statement is true concerning the vacuum pump? Illustration GS-RA-55 Illustration GS-RA-55: the U.S. Coast Guard has not released this illustration.

Correct Answer: Option A — The vacuum pump is designed to remove refrigerant vapor from the carbon filter tank and transfer these vapors to the evaporator to minimize the loss of refrigerant to the atmosphere.

Low-pressure centrifugal purge units utilize a vacuum pump to evacuate refrigerant vapors from the carbon filter tank, safely transferring them back into the main system evaporator to prevent costly refrigerant loss.