Engine : Refrigeration AC - 898/610
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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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