| 摘要 |
PURPOSE:To make it possible to provide different capacities of a heater between at the time of regular operation and at the time of starting operation and reduce energy loss by constituting a heater with its capacity capable of being changed over based on a temperatures detected by a temperature sensor which is provided on the outer wall of a burner. CONSTITUTION:A temperature sensor 26 and a ceramic heater 17 are provided on the outer wall 16 of a burner. A combustion circuit 31 is connected to an electric power source 30 through a power source switch 32. A ceramic heater 17 is changed over between serial connection and a parallel connection by switches 49 and 50 and it is constituted s that is can select a proper capacity. Furthermore, several heaters with different capacities are prepared, so that heater capacity can be changed according to the change-over of switch contacts. With this changing-over of the capacity of the ceramic heater 17 based on a temperature detected by a temperature sensor 26, the capacity of the ceramic heater 17 can be lowered during a regular operation than that at starting the operation and the energy loss can be reduced. |
