Combustion – Timer – programmer – retarder or condition responsive control – By combustion or combustion zone sensor
Patent
1974-09-09
1976-02-17
Favors, Edward G.
Combustion
Timer, programmer, retarder or condition responsive control
By combustion or combustion zone sensor
F23N 512
Patent
active
039389413
ABSTRACT:
A low voltage thermostatically energizable control system for a fuel burner having a fuel valve and operable from a direct current. The control system includes means for actuating the fuel valve to enable flow of a combustible fuel from the burner and means for spark igniting the fuel emitted from the burner. Means for detecting a flame is disposed near the burner, and the impedance between the detecting means and a point of reference potential is greater when no flame is present at the burner and is lower when a flame is present at the burner. A semiconductor device is coupled to the detecting means for conducting current only when the impedance between the detecting means and the point of reference potential is lower thereby to indicate the presence of a flame, and means is responsive to the current conducted by the semiconductor device for disabling the spark igniting means.
REFERENCES:
patent: 3645661 (1972-02-01), Goodman
patent: 3674410 (1972-07-01), Wade
patent: 3822981 (1974-07-01), Walbridge
Favors Edward G.
General Electric Company
Papin Joseph E.
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