| 摘要 |
PURPOSE:To automatically switch the operation to electric heating without the need of urgent oiling even with exhaustion of a fuel and hence improve convenience by automatically starting energization of the electric heating with extinguishment of fuel heating due to the exhaustion of a fuel. CONSTITUTION:Once the amount of combustion is reduced to a predetermined value or lower during a fuel heating, an ON signal of an oiling switch 21 is inputted by a microcomputer 38. Hereby, pulse counting means 33 starts to count the number N of driving pulses for a solenoid pump, and extinguishes combustion of a burner to interrupt the combustion heating without any oiling during the counting, and simultaneously actuates a convection fan 21 with a delay through a fan controller 35 to cool a combustion part. After delay timer means 36 counts for a predetermined time, the electric heating is started with an output from the delay timer means 36. Accordingly, since the operation is automatically switched to the electric heating after the interruption of the combustion heating due to exhaustion of a fuel, the heating is switched on and off without urgent oiling, and this is preferable when an operator has a visitor, when the operator must immediately go out, and when the operator must sleep. |
