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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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