Combustion – Timer – programmer – retarder or condition responsive control – Of igniter and feed controlled sequence
Patent
1975-07-28
1976-08-17
Favors, Edward G.
Combustion
Timer, programmer, retarder or condition responsive control
Of igniter and feed controlled sequence
431 27, 431 66, F23N 500
Patent
active
039751368
ABSTRACT:
A spark ignition circuit begins producing sparking pulses and a storage capacitor begins charging upon closure of a space thermostat. An electromagnetically operated valve controlling gas flow to a burner is energized sufficiently to open only upon discharge of the capacitor and a parallel holding circuit holds open the valve and prevents recharging of the capacitor.
A counting circuit, including a first monostable multivibrator, responds to each sparking pulse to effect incremental charging of a capacitor. Circuit means, including a programmable unijunction transistor and a second monostable multivibrator, responds to each occurrence of a predetermined charge on the capacitor to produce an output pulse comprising negative and positive signal voltages occurring in that order. Switching means responding to the positive signal of the first occurring output pulse effects the discharge of the storage capacitor and completion of the holding circuit, whereby the valve is open. If timely ignition occurs, means responding to burner flame cuts off igniter operation. If ignition does not occur within the following counting period, the switching means responds to the negative signal of the succeeding output pulse to break the valve holding circuit.
REFERENCES:
patent: 3270800 (1966-09-01), Deziel et al.
patent: 3832123 (1974-08-01), Walbridge
patent: 3847533 (1974-12-01), Riordan
patent: 3872320 (1975-03-01), Juskewicz
Baysinger Robert L.
Newport, Jr. Harry E.
Becker, Sr. Paul A.
Emerson Electric Co.
Favors Edward G.
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