| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat pump hot water supply system that can prevent a hot water circulation circuit on a heat pump unit side from being frozen even if a circulation pump gets out of order.SOLUTION: A heat pump hot water supply system 1 includes a hot water storage tank unit 2, a heat pump unit 3, and a hot water circulation circuit 4 which connects the hot water storage tank unit 2 and heat pump unit 3 to each other, is provided with a circulation pump 13 of the hot water circulation circuit 4 for circulating hot water and water on the side of the hot water tank unit 2, and includes an outdoor temperature sensor 29e for detecting an outdoor temperature and freezing prevention means of preventing the hot water circulation circuit 4 from being frozen by driving the circulation pump 13 when the outdoor temperature sensor 29e detects the outdoor temperature falling, and fault determination means of determining a fault of the circulation pump 13. The freezing prevention means prevents freezing by driving a compressor 21 included in the heat pump unit 3 when the fault determination means determines the circulation pump 13 gets out of order.SELECTED DRAWING: Figure 4 |
