| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas combustion type warm air heating apparatus with an air cleaner of a low cost and capable of avoiding an occurrence of a disaster due to a gas leakage by using a semiconductor type gas sensor for sensing an air pollution by a gas component contained in an indoor cigarette's smoke also as a sensor for sensing a fuel gas leakage. SOLUTION: In the gas combustion type warm air heating apparatus, if a fuel gas leakage occurs due to half-burning or the like during operating of a warm air heater 3 so that a resistance change rate (Rs/Rstd) of a gas sensitive element 15a of a semiconductor gas sensor 15 lowers below a threshold value of 0.3, a signal processing circuit 27 outputs a gas leakage sense signal Y to a controller 10 through an output circuit 25. When the controller 10 inputs the signal Y, it closes a solenoid valve to stop fuel gas supplying of the heater 3 from a gas burner in a combustion chamber to forcibly stop a combustion operation and rings an alarm buzzer 30 of a warning means to inform the gas leakage.
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