| 摘要 |
PURPOSE: To realize a combustion operation which is stabilized even in a high elevation area or in an operation of the burner in an excessively long run of a pipeline by lowering an operational frequency of a fuel pump and increasing the rotary speed of a combustion fan when a combustion failure is detected. CONSTITUTION: An oil burner 1, such as a fan heater or an FF-type hot air heater, is provided with a fuel pump 8 which feeds a liquid fuel to a burner 2 and a combustion fan 9 which feeds air to the burner 2 where their operations are controlled by means of a microcomputer. The fuel pump 8 and the combustion fan 9 are controlled so as to conform to a predetermined air fuel ratio during the operation. When the air fuel ratio is disturbed, the combustion failure is detected by changes produced in the current value of a flame rod 6. In this case, when the combustion failure is produced, the operation frequency of the fuel pump 8 is lowered, for example, by 10% of a rated value compared with the a mount of fuel at the present time, thereby reducing the supply amount of fuel. Furthermore, the ray speed rotation of the combustion fan 9 is increased, e.g. by 5% from the rated value, thereby bringing the operation to a stabilized operation. |
