| 摘要 |
PURPOSE:To eliminate an over-shoot after under-shoot and enable a superior control to be performed over a hot water supply temperature by a method wherein an amount of water more than a specified amount is restarted after a supply of water is stopped and when the hot water supply temperature is more than a predetermined temperature which is higher than or lower than a set temperature, a degree of opening of a fuel feed valve is fixed at a constant value. CONSTITUTION:When a degree of opening signal (g) of a valve to be issued from a control part to a driving part is to be calculated in reference to an equation I, a flow rate of supplied water is present again after a flow rate of supplied water is less than a specified amount and when a hot water supply temperature is more than a predetermined temperature alpha or more than alpha which is higher than or lower than the set temperature, a relation of k2=0 is supplied and the equation I is expressed as g=k1.T(Tsp, TMIN) and then a feed-back control function can be ignored, where T(Tsp, TMIN) is the function of supply water which is defined by a set temperature Tsp and a minimum sensing value of temperature TMIN of a temperature sensor, T(Tsp, To) in a function of water supply which is defined by a set temperature Tsp and a hot water supply temperature To and is also a feed-back control function. After a flow switch is turned OFF, if ti is turned ON again after 20 seconds, if it is higher than the predetermined temperature alpha or alpha', the water supply function K(Tsp-TMIN) is outputted as a fixed value C of the signal showing the degree of opening of the valve.
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