| 摘要 |
A system condition indicator for monitoring a number of interlock switches and fuel valves to detect what event first occurs to shut down a burner control system. The monitoring circuitry is periodically strobed once each cycle of the power line signal and is only responsive to an abnormal interlock switch or fuel valve during the strobe time. The present invention does not respond to an abnormal condition for a predetermined time after burner operation is initiated, to allow the system parameters to go to their operational values. The present invention includes circuitry for monitoring the pilot fuel flow and the main fuel flow and for providing an indication if either flow is abnormally terminated to shut down the furnace system. When the furnace system is shut down in response to an abnormal condition, an indication is provided of the first interlock switch or fuel valve to open, allowing a determination to be made of what caused the furnace failure, either during start-up or during normal operation.
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