| 摘要 |
PURPOSE:To prevent a small blame current from being generated by providing an object for aligning polarities of a power supply junction of a flame detector and an igniter, and carrying out in a different semi-cycle of an AC source a voltage supply in a normal direction with respect to a flame rod and the supply of a high voltage to an ignition electrode. CONSTITUTION:Different colors are applied for coating of primary side lead wires 16 and 17 of a transformer 9 used as a power supply junction of a flame detector 2 and secondary side lead wires 18 and 19 thereof. Further, different colors are applied for coating of lead wires 20 and 21 which form a power supply junction of an igniter 3, and these lead wires are connected to predetermined terminals of a circuit substrate 4 by being classified by color. Thus, the power supply polarity can be unified in a predetermined direction. That is, in a semi-cycle of an AC power supply 1 in which a voltage in a negative direction is applied to a flame rod 7, a high voltage is applied to ignition electrodes 12 and 13 by turning ON an ignition switch 14, whereas in a reverse semi-cycle, even the ignition switch 14 is turned ON, a high voltage is not applied to the ignition electrodes 12 and 13. Therefore, the reduction of the flame current and irregularity thereof can be prevented. |
