| 摘要 |
PURPOSE:To prevent kerosene from being collected within a combustion chamber of a kerosene hot water supplier due to a fault of a capacitor by driving a kerosene pump by an output of a first comparator, and stopping the combustion operation by an output of a second comparator comparing a charge voltage of a CD timer with a second reference voltage which is higher than a first reference voltage. CONSTITUTION:The control circuit of the kerosene hot water supplier is provided with a CR timer 36 starting a charge by a combustion operation signal, a first comparator 41 comparing the charge voltage of the CR timer 36 with a first reference voltage; a kerosene pump driving part 33 conducting the drive of kerosene pump by an output of the first comparator 41; a second comparator 57 comparing the charge voltage of the CR timer 36 with a second reference voltage which is higher than the first reference voltage; and an operation stopping part 35 stopping the combustion operation by an output of the second comparator 57. A signal CR timer 36 has concurrent functions as a prepurge timer relative to the drive of the kerosene pump and a safety timer relative to the stop of combustion. Therefore, when the safety timer is in a fault, the prepurge timer does not operate, and hence kerosene does not stay in the combustion chamber. |
