Burner control apparatus
AssigneeElectronics Corporation of America
InventorPhillip J. Cade
Life of this patent
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Abstract
Burner control apparatus includes control devices for actuating an ignition control means, and a timing circuit for providing an ignition timing sequence of four precise intervals. The timing circuit is actuated in response to a request for burner operation and the control devices are energized in sequence and combination in response to the actuated timing circuit. Time sequential pilot flame and main flame stabilization intervals are provided. If a signal from the flame sensor is received before the end of the overlapping flame stabilization timing intervals, the control device is energized and if flame detection signal is lost a lockout circuit is energized.
Claims19
Burner control apparatus for use with a fuel burner installation having an operating control to produce a request for burner operation, a flame sensor to produce a signal when flame is present in said fuel burner installation, and means responsive to said burner control apparatus for independently controlling pilot and main fuel flow, said burner control apparatus comprising:
- a control device for actuating said fuel control means;
- electronic circuit timing means for providing an ignition cycle having successive timing intervals including in sequence a preignition purge interval, a pilot ignition interval, a pilot stabilization interval, and a main fuel ignition interval which begins at the termination of the pilot stabilization interval and continues for a predetermined time after said pilot stabilization interval terminates;
- means responsive to a request for burner operation to initiate said ignition cycle by actuating said electronic circuit timing means;
- means responsive to said actuated circuit timing means for energizing said fuel control means at the end of said pilot stabilization interval to actuate said main fuel control means and initiate main fuel flow;
- flame signal responsive means responsive to a signal from said flame sensor when sensing a flame to maintain said control device energized;
- means responsive to failure to establish pilot flame during said pilot stabilization interval for preventing the production of further timing intervals by said timing circuit means;
- and
- means responsive to loss of said signal from flame sensor after said pilot stabilization interval to terminate all fuel flow and disable said timing circuit to prevent further ignition cycle operation.
Burner control apparatus for use with a fuel burner installation having an operating control to produce a request for burner operation, a flame sensor to produce a signal when flame is present in said fuel burner installation, and means responsive to said burner control apparatus for controlling fuel flow, said burner control apparatus comprising:
- a control device for actuating said fuel control means;
- a timing circuit for providing a cycle having successive timing intervals including in sequence a pre-ignition purge interval, pilot ignition interval, a pilot flame stabilization interval and 9 main fuel ignition interval;
- means responsive to a request for burner operation to initiate said ignition cycle by actuating said timing circuit;
- means responsive to said actuated timing circuit for energizing said control device at the end of said pilot stabilization interval to initiate fuel flow to said burner;
- flame signal responsive means responsive to a flame presence signal from said flame sensor to maintain said control device energized;
- means responsive to failure to establish pilot flame during said pilot ignition interval for preventing both pilot fuel flow and initiation of a further ignition cycle by said timing circuit;
- and
- means responsive to loss of said flame presence signal from said flame sensor after said pilot stabilization interval to terminate all fuel flow and prevent initiation of a further timing cycle.
Dependencies are inferred from the claim text.