| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable many kinds of operations, such as heating and hot-water storage, using two circulation pumps. <P>SOLUTION: The present invention is provided with a heat pump supply tube 9 of a heat pump circulation circuit is provided with a heat pump circulation pump 10. A first three-way valve 11 is provided upstream of the heat pump circulation pump 10, and a second three-way valve 12 is provided downstream of the heat pump circulation pump 10. A first combination tube 13 is provided for connecting the upper part of a hot-water storage tank 2 to a heating heat exchanger 14; a third three-way valve 15 is provided in a position, close to the heating heat exchanger 14, of the first combination tube 13, and a fourth three-way valve 16 is provided between the third three-way valve 15 and the hot-water storage tank 2. An intermediate return tube 18 is connected, communicating with the intermediate position of the hot water storage tank 2 from a downstream position of the heating heat exchanger 14. The second three-way valve 12 and the third three-way valve 15 are connected to provide a by-pass tube 19, and the first three-way valve 11 and the third three-way valve 16 are connected to provide a second combination tube 20, and a heat pump return tube 21 is provided, connecting an intermediate part 22 of the second combination tube 20 to a refrigerant-water heat exchanger 5. <P>COPYRIGHT: (C)2008,JPO&INPIT |
