| 摘要 |
PURPOSE:To heighten the effect of energy saving and improve the life of an ignition device by a method wherein a flame sensing time from the ignition starting time till a flame sensing is varied in response to a temperature of open air to be blown to an outer circumference of a flame and the amount of the blown air to the outer circumference of the flame. CONSTITUTION:A time from an ignition starting of a burner 3 to a flame detection performed by a flame sensor 34 is controlled in response to a surrounding air temperature detected by a surrounding air temperature sensor 51 when a drying operation is started. When a detected surrounding air temperature is high, a time up to a flame detection is controlled to be set to a short period of time. In turn, when it is low, it is controlled to be set to a long period of time. When the flame is not detected within these set times, the flame is reignited and then a drying operation is started. In addition, an amount of air sucked and discharged by a blower 7 is controlled by a sensed moisture detected by a moisture sensor 24. A time from an ignition starting of the burner 3 to the flame detection by the lame sensor 34 is controlled. When it is small in volume, a time up to detection of flame is controlled to be set in a short time and in turn when it is a large amount, it is controlled to be set to a long period of time. |
