Hot surface direct ignition system for gas furnaces

Details Hot surface direct ignition system for gas furnaces Hot surface direct ignition system for gas furnaces

1986-10-10

1988-05-24

Focarino, Margaret A.

Combustion

Timer, programmer, retarder or condition responsive control

Shutdown by sensed absence of flame in proving period

431 25, 431 27, 431 67, F23N 500

Patent

active

047462841

ABSTRACT:
A low cost hot surface ignition system particularly adapted for use in gas furnaces and the like, the system including low voltage control and timing circuitry effective to control a gas valve and high voltage ignition circuitry incorporating a hot surface silicon carbide igniter disposed in the path of incoming gas and in the heat of the flame when ignition is achieved to effect flame rectification resulting in flame sensing. The system also provides fail-safe operation or safety shutdown of the associated furnace if ignition is not achieved or in the event of a failure of a component of the system.

REFERENCES:
patent: 3947220 (1976-03-01), Dietz
patent: 4190414 (1980-02-01), Elmy
patent: 4260362 (1981-04-01), Matthews
patent: 4303385 (1981-12-01), Rudich et al.
patent: 4325689 (1982-04-01), Burke
patent: 4459097 (1984-07-01), Riordan et al.

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