| 摘要 |
<p>A movable valve body (70) for determining a mixing ratio of hot water and cold water is actuated by using a heat-sensitive coil spring (80) made of a material the spring constant of which changes with temperature, so as to eliminate the deviation of the actual temperature from a target temperature. When the temperature deviation cannot be eliminated by the temperature control by the coil spring (80) alone, it is eliminated by feedback control. A control gain K of this feedback control is determined on the basis of the rate of change in the spring constant in order to prevent hunting, etc. When the temperature deviation is eliminated by the feedback control, the relation between the target temperature and the present load adjustment quantity is stored, and the latter is used when the next target temperature is set.. The feedback control is not carried out at the start of tapping or at the time of the change of the target temperature until the temperature deviation becomes smaller than a threshold value (TR1) in order to prevent hot water from being supplied after dead water has been discharged. <IMAGE></p> |
