| 摘要 |
PURPOSE:To complete a defrosting operation within a short period of time and restrict the room temperature lowering during the defrosting operation. CONSTITUTION:In the case that an operation of an indoor heat exchanger 19 is performed in one unit of heat exchanger, a heating operation of one indoor heat exchanger 19 and a defrosting operation of an outdoor heat exchanger 8 are carried out with a changing-over control means 31. In the case that more than two indoor heat exchangers 19 are operated, the changing-over control means 31 is changed-over controlled so as to constitute a refrigerant circulation circuit including a compressor 1, the outdoor heat exchanger 8 and a heat accumulative tank 23. A total heating amount from the compressor 1 and the heat accumulation tank 23 is applied to the circulating refrigerant and the defrosting operation of the outdoor heat exchanger 8 is carried out with the heating amount. |
