Engine: Expired / Refrigeration AC

1. 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
2. B low pressure chillers are routinely opened for Maintenance thus introducing air at each opening
3. C low pressure chillers use extremely low boiling point refrigerants
4. D evacuation of the air from a low pressure chiller prior to charging with refrigerant is not possible

Tip: press A-D to answer