| 摘要 |
PURPOSE:To enable the number of burners to be easily changed by a method wherein an energized current for a fuel supplying proportional valve is determined under a predetermined relation in response to the number of rotation of a blower by a control device without having any relation with an opened or closed state of fuel changing-over solenoid valve. CONSTITUTION:Combustion air is supplied to a first burner 11a and a second burner 11b by a blower 12. An energization current of a governor proportional valve 23 for adjusting an amount of supplying fuel is determined under a predetermined relation by a control device 30 in response to the number of rotation of the blower 12. When a combustion amount is much in its volume, a changing- over solenoid valve 24 is opened and fuel is supplied from the first burner 11a and the second burner 11b through a first nozzle 16a and a second nozzle 16b. In turn, when the combustion amount is less in its volume, the solenoid valve 24 is closed. In this way, the combustion through the two burners and the combustion through one burner can be easily changed over with each other. |
