In a low-pressure centrifugal chiller, what is meant by the term 'high efficiency purge unit?'

Correct Answer: Option A — Those purge units which discharge very little refrigerant with the air being removed.

A high-efficiency purge unit on a low-pressure centrifugal chiller utilizes a specialized separation chamber to maximize the venting of non-condensable air while condensing and returning virtually all entrained refrigerant back to the system.