| 摘要 |
PURPOSE:To restrain water from being supplied beyond the maximum quantity of combustion and to obtain the temperature of tapped water alway equal to the set water temperature by controlling the amount of water supplied to a water heater on the basis of the difference of each signal from a temperature controller and a tap water temperature detector. CONSTITUTION:The output of a temperature controller 3 controls the quantity of combustion of a gas burner through a supply heat quantity controller 6 and adjust heating of water by a heat exchanger 2. A tap water temperature detector 4 is provided on the outlet of the heat exchanger. This detected signal and a signal from a temperature setter 5 are taken out as a differential signal in a water quantity controller 7. When the above-mentioned differential signal takes a fixed value or more by a timer signal from a timer section 8 equipped in the water quantity controller 7 even after a designated time passed, this control signal is transmitted to a supply water quantity controlling device 9, the supplied water quantity to the heat exchanger 2 is adjusted and the temperature of the tapped water is kept at the set temperature. |
