| 摘要 |
PROBLEM TO BE SOLVED: To provide a combined heat source heat pump device capable of continuing a heating operation even during a defrosting operation and of ensuring smooth transition to the heating operation after defrosting.SOLUTION: A combined heat source heat pump device comprises: a first heat pump circuit 40; a second heat pump circuit 50 heating a circulation liquid L using air heat via a second heating heat exchanger 51 provided in a heating circulation circuit 30; and a control unit 6, and actuates the second heat pump circuit 50 and drives a heating circulation pump 32 to perform a heating operation for heating the circulation liquid L, the control unit 6 including defrosting operation control means 63 executing a defrosting operation for defrosting an air-heat source heat exchanger 55 and driving the heating circulation pump 32 at a time of the defrosting operation, the control unit 6 actuating the first heat pump circuit 40 if the defrosting operation is to be performed during the heating operation, and the control unit 6 furthermore driving the earth thermal circulation pump 22 at a maximum revolving speed and then reducing the revolving speed stepwise so that a temperature of decompressed first refrigerant is equal to a predetermined temperature for certain time after the end of the defrosting operation. |
