F - Mech Eng,Light,Heat,Weapons – 23 – N
Patent
F - Mech Eng,Light,Heat,Weapons
23
N
341/19, 342/19.6
F23N 5/24 (2006.01)
Patent
CA 1137193
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 con- trol devices, and a timing circuit that provides several successive and par- tially 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 posi- tion. The present invention further includes a burner control system which verifies the proper operation of certain sensors in a burner or furnace in- cluding particularly a fuel valve end switch, an air flow switch, and modula- tor position switches.
357857
Electronics Corporation Of America
Smart & Biggar
LandOfFree
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