| 摘要 |
PURPOSE: A method is provided to prevent the incomplete combustion in a combustion chamber and to decide the ignition by the wind pressure led into the combustion chamber. CONSTITUTION: A detector of wind pressure includes: a combustion chamber(21) fixed on the upper face of a ventilating fan to burn the mixed gas of air required to burn with gas as fuel; a burner(22) fixed to the combustion chamber to ignite a flame to burn the mixed gas; a gas pipe(24) for feeding gas to the burner; an absorbing pipe(25) absorbing air required to burn; and a gas valve(23) provided on the gas pipe to selectively open and close a pipe. A common contact of a switching unit is automatically moved to a second contact point from a first contact point in case of lake of combustion air.
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