Combustion – Timer – programmer – retarder or condition responsive control – Control of purger – of scavenger or of combustion start-up...
Patent
1979-06-20
1984-11-13
Dority, Jr., Carroll B.
Combustion
Timer, programmer, retarder or condition responsive control
Control of purger, of scavenger or of combustion start-up...
431 63, 431 46, 431 26, F23N 500
Patent
active
044823126
ABSTRACT:
A burner control apparatus for use with a furnace installation that has an operating control to produce a request for burner operation, a flame sensor to produce a signal when flame is present in the monitored combustion chamber, one or more devices for control of ignition and relay fuel flow, and a modulator controlling air and fuel flow to a main burner for varying heat output. The burner control apparatus comprises a lockout relay for shutting down the furnace, a control device for actuating the ignition and fuel control devices, and a timing circuit that provides several successive and partially overlapping timing intervals of precise relation, including a purge interval, a pilot ignition interval, and a main fuel ignition interval. The present invention includes circuitry for providing a purge interval with the modulator at a high air flow setting. After the purge interval, pilot flame ignition is prevented until the modulator has been moved to a low fire position. The present invention further includes a burner control system which verifies the proper operation of certain sensors in a burner or furnace including particularly a fuel valve end switch, an air flow switch, and modulator position switches.
REFERENCES:
patent: 2616490 (1952-12-01), Wilson et al.
patent: 3221799 (1965-12-01), Hamelink et al.
patent: 3358735 (1967-12-01), Luft
patent: 3672811 (1972-06-01), Hron
patent: 3814569 (1974-06-01), Jacobsz
patent: 3840322 (1974-10-01), Cade
patent: 4101258 (1978-07-01), Jacobsz
Dority Jr. Carroll B.
Electronics Corporation of America
Pfund Charles E.
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