G - Physics – 05 – D
Patent
G - Physics
05
D
341/20
G05D 7/06 (2006.01) F23N 5/20 (2006.01) G05D 23/19 (2006.01)
Patent
CA 1090903
FUEL IGNITION SYSTEM HAVING CONTACT INTERLOCK PROTECTION ABSTRACT OF THE DISCLOSURE A control arrangement for a fuel ignition system for providing an interlock on start-up to prevent the energization of fuel valves of the system under certain failure conditions includes a switching device which is energized over normally closed contacts of a flame relay to close associated contacts to prepare an energizing path for a pilot valve and to energize an interlock relay which completes the energizing path for the pilot valve, a main valve being energized and the switching device being deenergized to interrupt the energizing path when the flame relay is operated in response to the establishing of a pilot flame, and the pilot valve and the main valve being maintained energized over a holding path provided by the inter- lock relay, the energization of the pilot valve and the inter- lock relay being prevented whenever the normally closed con- tacts of the flame relay are open on start-up. In a second embodiment, the pilot valve and the interlock relay are ener- gized directly over normally closed contacts of the flame relay so that the system is maintained in a lock out condition whenever the normally closed contacts are open on start-up.
274372
Johnson Controls Inc.
Osler Hoskin & Harcourt Llp
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