| 摘要 |
PURPOSE:To complete defrosting operation within a short period of time and restrict reduction in a room temperature during the defrosting operation in the case that some indoor heat exchangers of which number is more than a certain number are being operated. CONSTITUTION:A bypassing pipe 28 having an opening/closing valve 29 arranged therein is connected between a compressor 1 and an outdoor heat exchanger 8. When a defrosting operation is carried out and the indoor heat exchangers 19 being operated are more than those of N rooms, there is provided a control means for controlling an opening of the opening/closing valve 29. When the number of the indoor heat exchangers 19 being operated is more than that of N rooms, the opening/closing valve 29 is controlled for its opening by the control means. Then, a heating amount obtained from a heat accumulation tank 23 is imparted to a refrigerant circulation circuit and concurrently a high heating amount obtained from the compressor 1 is given to the outdoor heat exchanger 8 through the opening/closing valve 29 and a defrosting operation is carried out. With such an arrangement, it is possible to complete the defrosting operation of the outdoor heat exchanger 8 within a short period of time. Accordingly, it is possible to restrict reduction in room temperature during the defrosting operation. |
