HEAT PUMP-TYPE HOT-WATER SUPPLY AND AIR-CONDITIONING DEVICE

摘要

To make it possible, with the use of a minimum required heat source, to avoid risk of freezing in a water-refrigerant heat exchanger during a defrosting operation in a heat-pump hot-water supplying and air conditioning apparatus (HP) that has a water system (30) in which hot water is obtained by receiving heat from a heat-pump refrigerant system (10) and that performs the defrosting operation by setting a refrigerant circulation direction in the refrigerant system (10) to a cooling cycle. Depending on the detected water temperature of hot water flowing in the water system (30), one of circulating hot water circulating in the hot-water circulation flow path (32) and stored hot water stored in the hot-water tank (37) is selected as water to be flowed to an indoor heat exchanger (13) during the defrosting operation, and the stored hot water is selected when the detected water temperature is at or below a predetermined water temperature.