| 摘要 |
<p>PURPOSE:To enable a hot water temperature to be set and a pressure drop in a water feeding circuit to be reduced, by a method wherein signals sent from both a hot water- supply temperature setter and a hot water-supply temperature detector are calculated to control a heating controller and, at the same time, the openings of a by-pass control valve and a water quantity controller are respectively controlled according to the signal sent from the hot water-supply temperature setter. CONSTITUTION:A power source switch is closed, and according to a signal sent from a hot water-supply temperature setter 29, a by-pass valve operating device 24 is actuated to allow a by-pass control valve 9 to rotate. When a tap is opened to start the passing of water, a signal sent from a water quantity detector 3 is read and combustion by a heating device 27 is started. The temperature of a hot water-water mixture consisting of the hot water, which has been heated by a heat exchanger 8, and the water, which has passed through the by-pass control valve 9, is detected by a hot water-supply temperature detector 13. According to a signal sent from this detector 13 and the signal sent from the hot water-supply temperature setter 29, a heating controller 26 is operated to adjust a heating rate by the heating device 27. Further, according to the signal sent from the water quantity detector 3, a driving device 16 for controlling water quantity is operated, whereby overall feed water is controlled.</p> |
