| 摘要 |
PURPOSE:To increase a temperature of a hot water supply to a fixed temperature quickly and make its overshoot small by making compensations of a time constant of a hot water supply system before and after a fixed hot water supply temperature different from each other. CONSTITUTION:When a hot water supply temperature rises, a resistance value of a temperature sensing element 14 is reduced, and when the hot water supply temperature exceeds a fixed hot water supply temperature, voltage at a point of contact 15 is lower than the voltage at a point of contact 19, a transistor 45 is conducted by a high level voltage signal generated from an amplifier 43, a relay R being excited shuts relay contact r1, which is opened normally and opens relay contacts r2 and r3 which are shut normally. Then, a time constant of a differential circuit 9 is made small and the time constant of an integration circuit 7 is made large, and an electric current which flows to a coil of a proportional solenoid valve 2 for a supply of gas under control of a control circuit 6 or a valve opening is made smaller. |
