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Why is a purge recovery unit typically fitted on low pressure centrifugal chillers?
A) evacuation of the air from a low pressure chiller prior to charging with refrigerant is not possible
B) low pressure chillers use extremely low boiling point refrigerants
C) such a chiller can operate at a pressure below atmospheric pressure on the low side thus drawing in air through any low-side leaks
D) low pressure chillers are routinely opened for maintenance thus introducing air at each opening
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