| 摘要 |
PURPOSE:To contrive simplification of a control circuit, by constitution with a logical circuit through each output of a thermistor disconnection detecting circuit for hot water temperature detection, an overheated temperature detecting circuit, a hot water temperature control circuit and a flame detecting circuit, and controlling a burner motor and a solenoid pump. CONSTITUTION:When a temperature of hot water is low a resistance value of a hot water temperature detecting thermistor 1 is large, and every output of a water temperature controlling operational amplifier 11, an overheated temperature detecting maplifier 10 and a deisconnection detecting amplifier 12 for the above thermistor 1 is ''1''. Then, the outputs of logical circuits 14 and 16 which are AND circuits become ''1'', which is electrified to a relay 40 for driving a burner motor. At this time, a resisting value of a flame detector 9 is large, the output of a flame detecting amplifier 13 is ''1'', which is electrified to a relay 39 through an amplifier 21 for driving an ignitor. When the output is applied from a time constant circuit which is constituted with a condenser 30 after a lapse of a fixed time the output is electrified to a relay 38 through a logical circuit 31 for driving a solenoid pump. |
