| 摘要 |
PURPOSE:To prevnt the incomplete burning and improve the safety by a method wherein an exhaust fan is provided at the heat exchanger downstream side of an instantaneous water heater, a pressure sensor is provided to detect the pressure at the further downstream side of the exhaust fan, the function of a heat generating part is designed to be stopped when the pressure exceeds a preset pressure level. CONSTITUTION:A fan 12 is provided at the downstream side of a heat exchanger 11, a pressure sensor 14 is provided between the fan 12 and an exhaust cylinder 13. The function of a burning part is stopped by the pressure sensor when the pressure exceeds a preset pressure level. For instance, when the preset pressure is 10mm.H2O, the burning is stopped in case that a parameter CO/CO2 is less than 0.02, accordingly, the incomplete burning can be prevented. |
