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Why is a purge recovery unit typically fitted on low pressure centrifugal chillers?
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
B) low pressure chillers are routinely opened for Maintenance thus introducing air at each opening
C) low pressure chillers use extremely low boiling point refrigerants
D) evacuation of the air from a low pressure chiller prior to charging with refrigerant is not possible
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