| 摘要 |
PURPOSE:To satisfy mutually exclusive requirements of prevention of hunting and improvement of responsiveness by controlling a valve so that it is braked temporarily in a region near a set value. CONSTITUTION:A mixing valve 21 distributes water, which is led in from a water conduit 22, to a hot water-side flow passage 26 in the side of a heat source 25 and a cold water-side flow passage 27. Hot water heated through a heat exchanger 24 is mixed with cold water from the flow passage 27 and is sent to a tap 29. The signal of a thermistor 30 is taken into a controller 32 together with the signal set by a temperature setter 31, and the controller 32 controls the valve 21. The controller 32 divides the range of the adsolute value of the temperature difference between the thermistor 30 and the setter 31 to the first - the fourth regions to control the valve 21. That is, the manipulated variable of the valve 21 is kept constant in the first region, and the manipulated variable is made proportional to the deviation in the second region where the temperature deviation is smaller than a prescribed value, and the manipulated variable of the valve 21 is made smaller than that in the second region in case of the third region, and the valve 21 is closed in the fourth region. |
