| 摘要 |
PROBLEM TO BE SOLVED: To prevent the increase of ignition noise in hot starting by closing a magnetic solenoid valve immediately after extinction. SOLUTION: When an ignition lever 21 is operated for extinction, a main valve 25 is closed to cut a gas channel to a burner 4 and a sensing burner 27, and a power source switch 33 is turned off (S1). When the turning-off of the power source switch 33 is detected (S2:YES), a pulse signal from an output port a is stopped, FET1 is switched off, a level signal from an output port b is lowered (low), and FET 2 is switched off to forcibly close the magnetic solenoid valve 24 (S3). Accordingly, as the magnetic solenoid valve 24 is constantly closed in ignition, the delayed ignition caused by the delay of spark discharging from an ignition electrode 29 with respect to a release of a fuel gas, can be prevented even in hot starting. COPYRIGHT: (C)2004,JPO
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