Combustion – Timer – programmer – retarder or condition responsive control – By sensing of gas leakage – flashback or escaped flame
Patent
1996-10-31
1999-05-11
Price, Carl D.
Combustion
Timer, programmer, retarder or condition responsive control
By sensing of gas leakage, flashback or escaped flame
431 25, 431 18, 431 75, 126116A, F23N5/00
Patent
active
059020997
ABSTRACT:
An electric control is shown adapted for use with gas furnaces which controls fan motors, ignition controls and a gas valve based on inputs from a room thermostat, limit switches, a flame probe, a flame roll-out probe, and a condensate sensor. A roll-out detection circuit utilizing flame rectification includes a multidirectional roll-out probe 16 coupled to a microcontroller (U2) through an inverter (U3) to provide both fault both protection and fault identification. A condensate sensor (20) in the form of a conductive condensate sensor member is also coupled to the microcontroller (U2) through an inverter (U3) to detect the presence of condensate build-up.
REFERENCES:
patent: 3652195 (1972-03-01), Macintosh et al.
patent: 5197664 (1993-03-01), Lynch
patent: 5506569 (1996-04-01), Rowlette
patent: 5722822 (1998-03-01), Wilson et al.
Eifler Mark A.
Garnett Ronald E.
Rowlette Mitchell R.
Baumann Russell E.
Donaldson Richard L.
Grossman Rene E.
Price Carl D.
Texas Instruments Incorporated
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