| 摘要 |
PURPOSE:To supply hot water in a large flow rate and at the same time automatically stop hot water supply by providing a water supply detection element in the water supply path of a heat exchanger for hot water supply and a control circuit which controls a proportional control valve to control the amount of combustion for 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. For 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, and at the same time it is possible on the space heating side to control the temperature of circulating hot water by controlling an electromagnetic valve 20 by opening or closing it by the signal from the thermistor 25 for space heating. Further, during automobile hot water supply operation, hot water in a large flow rate is automatically supplied by opening a hot water supply control valve 29, and it is possible to supply hot water into a bath tub automatically in a short time to a desired temperature and to stop automatically hot water supply by closing the hot water supply flow rate control valve at an arbitrary set amount. |
