| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a combustion apparatus capable of avoiding occurrence of malfunctioning even if a solenoid valve such as a latch solenoid valve is used in a fuel supply system, and securing safety even if malfunctioning occurs.SOLUTION: Upon output of an open signal, a signal holding circuit is switched from a closed state to an open state, a latch solenoid valve is switched to an open state to start ignition, and a flame is detected. A flame monitoring circuit is switched to a flame detection state, accordingly. Upon output of a close signal, the signal holding circuit is switched from the open state to the closed state to stop supplying gas and the flame monitoring circuit is switched to a non flame detection state. Upon output of an open signal again, the signal holding circuit is switched from the closed state to the open state and the flame monitoring circuit is switched to the flame detection state. However, if a flame of an upper flame burner goes out despite the open state, an interlock timer starts and a stop gas solenoid valve is forcibly switched to the closed state at a moment of passing of time-up of the interlock timer, thereby cutting off supply of the gas.</p> |
