| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent an entire water circuit K in a refrigerating cycle unit 1c from freezing without affecting hot water in a tank 7. <P>SOLUTION: This multi-functional water heater comprises a supplied hot water temperature sensor 16 for detecting a water temperature in the water circuit K, an intermediate temperature water supply passage 15 for supplying intermediate temperature water after circulating a brine heating circuit B to the water circuit K, and water passage selector valves 13 and 14 for selecting the circulation of the intermediate temperature water to the intermediate temperature water supply passage 15. When a water temperature detected by the supplied hot water temperature sensor 16 is lower than a specified value in a state of circulation in a refrigerant circuit R stopped, a control device 20 supplies the intermediate temperature water to the water circuit K by using the intermediate temperature water supply passage 15. By this constitution, the entire water circuit K in the refrigerating cycle unit 1c can be prevented from freezing without affecting hot water in the tank 7 by supplying the intermediate temperature water coming out at approx. 50°C by the heating of brine in a water brine heat exchanger 8 to the water circuit K in the stopped refrigerating cycle unit 1c by using the intermediate temperature water supply passage 15. <P>COPYRIGHT: (C)2003,JPO |
