F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
341/19
F23N 5/24 (2006.01) F23N 5/20 (2006.01) F23Q 3/00 (2006.01)
Patent
CA 1121484
FUEL IGNITION SYSTEM CONTROL ARRANGEMENT HAVING A TIMING CIRCUIT WITH FAST RESET ABSTRACT An arrangement for a direct ignition type fuel ignition system includes a capacitive timing network which enables a flame relay to operate during a trial for ignition interval, energizing a fuel valve to supply fuel to a burner for ignition, and a flame sensing circuit which causes the flame relay and the fuel valve to be maintained operated only if a flame is sensed before the end of the trial for ignition interval. In the absence of a flame, a diode, back biased by the timing signal, decouples the flame sensing circuit from the timing network. When a flame is established, a further diode, back biased by a control signal provided by the flame sensing circuit, decouples the timing network from the flame sensing circuit. In an embodiment wherein the charging time of a capacitor defines the trial for ignition interval, a fast reset circuit provides rapid discharge of the timing capacitor when power is removed from the timing net- work. In another embodiment, wherein the discharge time of a capacitor defines the trial for ignition interval, a checking relay, energized over normally closed contacts of the flame relay, operates to disconnect the capacitor from a source of charging current and complete a discharge path for the capaci- tor enabling the timing network to generate the timing signal. The checking relay is prevented from operating, thereby main- taining the system locked out, if the flame relay is operated at the start of an ignition cycle.
315485
Johnson Controls Inc.
Osler Hoskin & Harcourt Llp
LandOfFree
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