| 摘要 |
PURPOSE:To facilitate the operation for starting combustion, by making it needless to hold a knob for a long time unitl a solenoid valve is opened by an electromotive force caused through a thermocouple at the time of ignition. CONSTITUTION:When a starting switch 20 is closed, a relay RY2 operates. An igniter 32 is fired by the closing of a contact ry21 of the relay, thereby starting the combustion on a burner. At that time, an electromagnet coil 31 is energized to continuously open the solenoid valve. The electromotive force is caused by the combustion through the thermocouple 24. When the voltage of the electromotive force becomes e1, the voltage is amplified by an amplifier 25 and the output of a voltage comparator 26 becomes ''H''. At that time, a constant voltage circuit 23 starts charging a capacitor C. When the voltage becomes e2 higher than e1, A voltage comparator 27 generates an output ''L''. When the terminal voltage of the capacitor C reaches a reference level, a voltage comparator 28 generates an output ''L'' and the igniter 32 is cut off by the opening of a contact ry1 of a relay RY1. |
