| 摘要 |
PROBLEM TO BE SOLVED: To prevent a liquid refrigerant from being sucked to a compressor, while shortening a degassing time of a receiver before switching of an ordinary refrigeration cycle and a defrost cycle.SOLUTION: A refrigerant circuit (30) implements a degassing operation while reducing an opening of an outflow-side expansion valve (52) in comparison with an opening in an ordinary refrigeration cycle before a switching operation, and implements a liquid recovering operation to raise a high pressure of the refrigerant circuit (30) after the lapse of a prescribed time from the start of the degassing operation.SELECTED DRAWING: Figure 6 |
