Combustion – Timer – programmer – retarder or condition responsive control – Control of purger – of scavenger or of combustion start-up...
Patent
1979-02-05
1981-01-06
Ward, Jr., Robert S.
Combustion
Timer, programmer, retarder or condition responsive control
Control of purger, of scavenger or of combustion start-up...
431 78, F23N 500
Patent
active
042433720
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, and one or more devices for control of ignition and/or fuel flow. The burner control apparatus comprises lockout apparatus for de-energizing the control apparatus, a control device for actuating the ignition and/or fuel control devices, and a timing circuit that provides four successive and partially overlapping timing intervals of precise relation, including a purge timing interval, a pilot ignition interval, and a main fuel ignition interval. The present invention further includes a burner control system which verifies the proper operation of certain sensors in a burner or furnace including particularly the air flow sensor. Additionally, the present system also prevents an attempt to ignite a burner if a condition is detected which indicates that the air flow sensor has been bypassed or wedged in the actuated position.
REFERENCES:
patent: 3343585 (1967-09-01), Eckelberry
patent: 3393037 (1968-07-01), Giuffrida et al.
patent: 3449055 (1969-06-01), Blackett
patent: 3574495 (1971-04-01), Landis
patent: 3795843 (1974-03-01), Ishida
patent: 3840322 (1974-10-01), Cade
patent: 3987346 (1976-10-01), Riordan
patent: 4035135 (1977-07-01), Jacobsz
patent: 4137035 (1979-01-01), Cade
Electronics Corporation of America
Pfund Charles E.
Ward, Jr. Robert S.
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