Burner control system

Combustion – Timer – programmer – retarder or condition responsive control – Control of purger – of scavenger or of combustion start-up...

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431 46, 431 79, F23N 500

Patent

active

043952240

ABSTRACT:
A burner control apparatus for use with a fuel 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: 3644074 (1972-02-01), Cade
patent: 4035135 (1977-07-01), Jacobst
patent: 4137035 (1979-01-01), Cade
patent: 4243372 (1981-01-01), Cade
patent: 4249884 (1981-02-01), Cade

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