| 摘要 |
PURPOSE:To confirm surely the operation of a wind pressure switch in a combustion control device and enhance reliability by providing a combustion waiting circuit with an operation check circuit for a wind pressure switch which judges the state of operation of the wind pressure switch. CONSTITUTION:The subject device consists of a combustion waiting circuit I and a combustion circuit II. The combustion waiting circuit I is provided with a wind pressure operation confrimation circuit A in parallel with water level control circuit, etc. The circuit A detects the state of contact of a wind pressure switch 2 if there is an output signal from an operation switch 1, and if the contact is closed, it is judged to be a defective contact and the circuit A outputs an alarm signal 3 and, if the contact is open, it is judged that the contact is normal and the circuit A outputs a sequence control advance signal. By providing a check timing circuit B between the operation switch 1 and the wind pressure confirmation circuit A, even when load requirement is special, the wind pressure switch operation confirmation circuit A works with the rotation due to inertia surely stopped, and the check of the wind pressure switch 2 is made positively. |
