| 摘要 |
PROBLEM TO BE SOLVED: To completely raise the temperature of an oil feed port of a vaporizer during an ignition and realize a stable ignition without generating an ignition failure or white flame. SOLUTION: A hot air heater comprises a vaporizer for supplying vaporized gas obtained by vaporizing liquid fuel to a burner and burning it, a heating element for vaporizing the liquid fuel, a temperature detecting element for detecting the temperature of the vaporizer, a pump for feeding the liquid fuel to the vaporizer, an igniter for igniting the burner and a control means for controlling the temperature of the vaporizer to a prescribed temperature during a combustion. The control means includes an ignition sequence in which it controls the supply of electric current to the heating element of the vaporizer, retains the control temperature of the vaporizer detected by the temperature detecting element for a prescribed time▵t at a heat-retaining temperature Th before the control temperature reaches an ignition command temperature Tt lower than a prescribed temperature To during a combustion, and then raises it to the ignition command temperature Tt and operates the igniter.
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