| 摘要 |
PURPOSE:To lower the cost for an automatic hot water supply function and to freely install the supplier by actuating a proportional control valve to control the quantity of a hot water supply burner based on signals from a hot water supply thermistor and opening a solenoid valve for additional burning when the signal from the hot water supplying exceeds the supply hot water capability, thereby causing a burner for additional burning to automatically supply hot water to the bathtub. CONSTITUTION:At the time of an automatic hot water supplying operation, a hot water supply control valve 24 is opened and water is through a hot water supply heat exchanger 1, and a proportional control valve 13 is actuated based on a signal from a thermistor 3 for supplying hot water, and the quantity of combustion of a hot water supply burner 14 is controlled to stably control the temperature of hot water to supply hot water automatically to a bathtub 4. In a case where the temperature of water is low in winter season or the like, when the hot water supply capability is exceeded and the signal from the hot water supplying thermistor 18 becomes lower than that equivalent to the automatic supply hot water set temperature, a pump 3 is operated, the passage of water is detected by a circulating water detection element 19, and an additional burning solenoid valve 15 is opened and an additional burning burner 16 is operated simultaneously. Thus, the temperature of hot water within the bathtub is raised to a desired bath heating temperature in a short period of time with a large capability thereby to automatically supply hot water. |
