| 摘要 |
PURPOSE:To prevent the unloaded burning in a state where a casing spring is dislocated, by supplying electricity to the control circuit only through a switch which turns on and off interlocked to the opening/closing action of casing panel. CONSTITUTION:Independently-operated manual switch 11 for circulation pump 12 is turned on and pump 12 for eliminating air in the room heater circulating water system is operated. Under this condition, a switch 6 interlocked to the opening/ closing action of casing panel is in ''OFF'' position and no electric supply is made to the control circuit 7. Next, switch 6 is turned on. Here a pilot flame is generated by ignition and is confirmed by flame detector. Following temperature detection, the on/off switch 9 is turned on by the action of combustion control circuit 7, opening the fuel supply valve 8 and turning on the on/off switch 10. As a result, pump 12 is started. |
