Combustion – Timer – programmer – retarder or condition responsive control – Sensor of first burner controls second burner – e.g. – pilot...
Patent
1976-06-04
1978-03-14
O'Dea, William F.
Combustion
Timer, programmer, retarder or condition responsive control
Sensor of first burner controls second burner, e.g., pilot...
431 42, 431 71, 431 26, F23Q 908, F23Q 2300, F23N 500
Patent
active
040788792
ABSTRACT:
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 generating 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 continue 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.
REFERENCES:
patent: 2989117 (1961-06-01), Graves
patent: 3279521 (1966-10-01), Munson et al.
patent: 3584988 (1971-06-01), Hirsbrunner
patent: 3902839 (1975-09-01), Matthews
Johnson Controls Inc.
Jones Larry
O'Dea William F.
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