Why is a purge recovery unit typically fitted on low pressure centrifugal chillers?

Correct Answer: Option B — such a chiller can operate at a pressure below atmospheric pressure on the low side thus drawing in air through any low-side leaks

Under USCG National Maritime Center examination standards, the accepted correct answer is: such a chiller can operate at a pressure below atmospheric pressure on the low side thus drawing in air through any low-side leaks.