| 摘要 |
PURPOSE:To improve a rising characteristic of a temperature of fed hot water by a method wherein an amount of water decreasing signal outputted from an amount of inputted water discriminating part in response to an amount of gas discriminating signal from an amount of gas discriminating part for outputting an amount of gas discriminating signal of a preference of a control of gas amount is prevented from being applied to a sequence controller in case that an increased amount of gas is less than a maximum amount of gas. CONSTITUTION:When a difference in temperature between an input water temperature To and a predetermined value Ts is low, for example, in case that the input water temperature To is high or in case that a predetermined output hot water temperature Ts is low, an increased amount of gas Nup is less than a maximum amount of gas Nmax, so that a first and a second discriminating signals of 'H' level are outputted from a gas amount discriminating part 30. The first and second discriminating signals are applied to a sequence controller 34 and at the same time added to a gate part 32 to close the gate part 32, so that a decreased amount of water signal outputted from an input amount of water discriminating part 24 is prevented from being added to the sequence controller 34. With this arrangement, the sequence controller 34 may add a control signal for increasing an amount of gas up to an increased amount of gas Nup to a gas proportional valve actuator 22 and then does not output a decreased amount of water control signal to the amount of water servo valve actuator 20.
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