FUEL IGNITION SYSTEM HAVING INTERLOCK PROTECTION AND ELECTRONIC VALVE LEAK DETECTION

摘要

FUEL IGNITION SYSTEM HAVING INTERLOCK PROTECTION AND ELECTRONIC VALVE LEAK DETECTION A fuel ignition system of the pilot ignition type including a control circuit for operating pilot and main valves of a redundant valve assembly, the control circuit having control relays which provide an interlock on start-up to prevent the energization of the valves under certain failure conditions, the control circuit including a flame sensing circuit which is operable to prevent start-up of the system when a flame is provided as the result of a leak condition for the pilot valve, and to terminate an ignition cycle causing complete shut off of fuel whenever a flame is provided as the result of a leak condition for the main valve. ;