| 摘要 |
PURPOSE:To improve the safety and correspondence ability of the titled device by a method wherein a structure is designed to stop and display the operation of an ignitor and a solenoid valve at the ignition failure in a gas oven and the like. CONSTITUTION:When the temperature of a heating chamber is lower than the presetting temperature, a switch 7 is closed, an ignition safety timer circuit 8 is operated, then an output becomes H during 20sec. Thereby, a solenoid valve 1 is energized and closed, a gas burner 2 is ignited. The output of an ignition detecting circuit 9 is held at L until the ignition detection, the energizing for an ignitor 3 continued. When the ignition is made within 20sec, the output of the ignition detecting circuit 9 becomes H, the energizing for the ignitor 3 is stopped, then the ignition operation is stopped. When the ignition is not made within 20sec, the output of the ignition safety timer circuit 8 becomes L, the output of a NOR gate 11 is inversed to H, a switch 16 is opened, the solenoid valve 1 is closed, the energizing for the ignitor 3 is stopped. The ignition failure is displayed by the on/off of a LED14, the safety ability is improved by said structure. |
