Combustion – Timer – programmer – retarder or condition responsive control – Sensor of first burner controls second burner – e.g. – pilot...
Patent
1976-06-21
1978-03-07
O'Dea, William F.
Combustion
Timer, programmer, retarder or condition responsive control
Sensor of first burner controls second burner, e.g., pilot...
431 43, 431 25, F23Q 908, F23Q 2300
Patent
active
040777626
ABSTRACT:
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 interlock relay, the energization of the pilot valve and the interlock relay being prevented whenever the normally closed contacts of the flame relay are open on start-up. In a second embodiment, the pilot valve and the interlock relay are energized 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.
REFERENCES:
patent: 2989117 (1961-06-01), Graves
patent: 3376099 (1968-04-01), Giuffrida
patent: 3501253 (1970-03-01), Wade
patent: 3902839 (1975-09-01), Matthews
Johnson Controls Inc.
Jones Larry
O'Dea William F.
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