| 摘要 |
PROBLEM TO BE SOLVED: To provide a heating system which properly inhibits freezing damage of a path, in which a heat medium for heating circulates, with a relatively simple structure.SOLUTION: A heating system 2 includes: a heat pump 12; a tank 22; a heat pump outgoing pipe 16; a heat pump return pipe 18; a heat pump circulation pump 14; a heater 50; a heating outgoing pipe 42; a heating return pipe 44; a heating circulation pump 46; a first bypass passage 90; a first thermally operated valve 91; a second thermally operated valve 92; and a control unit 70. The control unit 70 carries out a freezing prevention operation in which the second thermally operated valve 92 is opened and the heating circulation pump 46 is operated according to an outdoor temperature.SELECTED DRAWING: Figure 1 |
