| 摘要 |
PURPOSE:To make a positive informing of a cleaning period for tar adhered to an evaporator and the like and enable a keeping of normal igniting condition to be performed by a method wherein a flame sensor and a discriminating means for judging if an output from the flame sensor is more than a desired value or not and making an igniting instruction signal are arranged. CONSTITUTION:In case that some tars are adhered to a feeding passage to cause a specified calorie not to be obtained, a combustion B with less calorie occurs, a flame resistance to be sensed by a flame sensor 8 becomes a value shown at the line B and exceeds the predetermined value K. Therefore, the discriminating means 9 produces an ignition instruction signal P and causes an informing means 5 to be turned ON. With this arrangement, the informing means 5 is operated under a cleaning period and this condition is displayed by the lamp 5a and informed an operator of this condition. Also in case that the cleaning operation is not performed and the vaporing means is to be replaced and the amount of tar in the feeding passage A exceeds the desired value, it is informed that this is a time for vaporing elements to be replaced. If separate desired values K, K1 are judged and a different signal is produced, it is possible to perform two-step control over the lamp display in case of high ignition and another lamp display in case of low ignition. |
