| 摘要 |
PURPOSE:To supply automatically hot water in a large flow rate and at the same time control a hot water supply flow rate control valve to a small flow rate in order to limit the addition of hot water at a high temperature by providing a control circuit which controls a proportional control valve to control the amount of combustion of each burner. CONSTITUTION:A proportional control valve 18 is operated and controlled by an output calculated in a control circuit by signal from a thermistor 23 for hot water supply during hot water supply operation or by a signal from a thermistor 25 for space heating during space heating operation. Further, during the both operations at the same time the proportional valve is operated by the output calculated in hot water supply mode to which priority is set in the control circuit to control the hot water temperature, and at the same time on the space heating side it is possible to control the temperature of the circulating hot water by controlling an electromagnetic value 20 by opening and closing by a signal from the thermistor for space heating. Furthermore, during automatic hot water supply operation hot water is automatically supplied in a large flow rate by opening a hot water supply flow rate control valve 29 and raise the temperature of the hot water in a bath tub to a desired final temperature of the hot water. |
