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

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 chillers use extremely low boiling point refrigerants
evacuation of the air from a low-pressure chiller prior to charging with refrigerant is not possible
low-pressure chillers are routinely opened for maintenance thus introducing air at each opening

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