Fuel ignition system control arrangement providing total...

F - Mech Eng,Light,Heat,Weapons – 23 – Q

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F23Q 9/08 (2006.01) F23N 5/00 (2006.01) F23N 5/20 (2006.01) F23N 5/24 (2006.01) F23Q 23/00 (2006.01)

Patent

CA 1084610

FUEL IGNITION SYSTEM CONTROL ARRANGEMENT PROVIDING TOTAL FUEL SHUTOFF AND CONTACT PROTECTION Abstract of the Disclosure: A control arrangement for a fuel ignition system to provide an interlock on start-up to prevent energization of fuel valves under certain failure conditions includes a pulse gen- erating circuit operable when enabled to provide pulses for enabling a first switching device which energizes a pilot valve to supply fuel to a fuel outlet and prepares an energizing path for a main valve, and a second switching device enabled by a flame sensing circuit when a flame is established at the outlet to close associated contacts to complete the energizing path for the main valve and to cause the pulse generating circuit to con- tinue to generate pulses for maintaining the first switching device enabled, the pulse generating circuit being inhibited whenever the contacts are closed at start-up, or close after the system is in a lock out state, preventing the enabling of the first switching device to maintain the pilot valve and the main valve deenergized.

274629

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