G - Physics – 05 – D
Patent
G - Physics
05
D
341/19, 342/13.1
G05D 22/02 (2006.01) F23N 5/20 (2006.01)
Patent
CA 1076685
Abstract of the Disclosure: A control circuit for a fuel ignition system of the direct ignition type for providing an interlock on start-up to prevent the energization of a fuel supply valve of the system under certain failure conditions includes an interlock relay which is energized, after a predetermined delay, over normally closed contacts of a flame relay to control a timing network to cause a flame sensing circuit to enable the flame relay to energize the valve during a trial for ignition interval defined by the timing network, the flame sensing circuit maintaining the flame relay, and thus the valve, energized when a flame is pro- vided during the trial for ignition interval, the energization of the valve and the interlock relay being prevented if the normally closed contacts of the flame relay are open on start- up, and the delayed operation of the interlock relay preventing lockout of the system following momentary loss of power.
285546
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