| 摘要 |
PURPOSE:To give no discomfort feeling to a user by varying a temperature of hot water even if the titled boiler is used intermittently, by so constituting that even if an electric power source of a control circuit is interrupted an integrated quantity of integrating capacitor is being stored. CONSTITUTION:A voltage drop is generated and a transistor 26 is electrified through divided voltage of resistors 24 and 25 as an electric current of an excitation coil 19 is being applied to resistor 18 under a state that a hot water tap is opened and electric power source switch 10 is closed. Then, a transistor 23 is electrified through existence of base resistor 27 and a switching device is turned into a closed state. As the resistor 18, however, is not electrified when the hot water tap is closed and the electric power source switch 10 is opened, the transistor 26 is not electrified causing that the transistor 23 is turned into an OFF state and the switching device is turned into an open state. As for a temperature control circuit which is obtained by providing the switching device in a discharge channel of an integrating capacitor 20 like this, a temperature of hot water hardly vary even if hot water supply is started again from a state where the hot water supply is suspended by closing the hot water tap as an integrated quantity of the integrating capacitor 20 hardly vary through interruption of the electric power source switch. |
