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

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

Low-pressure centrifugal chillers operate below atmospheric pressure during normal cycling, allowing ambient air and moisture to infiltrate through shaft seals or gasket leaks. Purge units automatically extract these non-condensables to maintain system efficiency.