| 摘要 |
PURPOSE:To avoid danger of gas explosion by blocking a gas duct when water is collected in a water heater by accident. CONSTITUTION:When water is collected in a water heater, a main nozzle 5 and a pilot nozzle 9 are soaked in water, etc. and the bare part 14 of the lead wire of an ember detector 11 is dipped in water, etc. and so the thermoelectromotive force of the ember detector 11 decreases. Consequently a make type electromagnetic valve blocks a gas duct. |
