| 摘要 |
<p>PURPOSE:To perform automatic diagnosis of abnormality of a combustion apparatus by a method wherein a resistance element to set a value of a current flowing during ordinary operation of a drive control circuit is connected to a route for a current flowing to the drive control side of a shunt circuit to distinguish a current flowing to the drive control circuit side from a current flowing to an element to be controlled. CONSTITUTION:An igniter 98, a main solenoid valve 8a, an auxiliary solenoid valve 8b, a combustion fan 7, and a proportional valve 10 are driven and controlled by an igniter drive control circuit 71, a main gas solenoid valve drive control circuit 72, an auxiliary gas solenoid valve drive control circuit 73, a fan drive control circuit 74, and a proportional valve drive control circuit 75, respectively. A shunt circuit for a route through which a current flows to the circuits 71-75 sides and a route through which a current flows to each object to be controlled is formed on the output sides of the circuits 71-75. Resistors R1-R5 serving as a resistance element to set a current flowing during ordinary operation of each drive control circuit to a known value are connected to respective current routes flowing to respective drive control circuit sides of the shunt circuit.</p> |
