Combustion – Timer – programmer – retarder or condition responsive control – By sensing of gas leakage – flashback or escaped flame
Reexamination Certificate
2006-09-26
2006-09-26
Price, Carl D. (Department: 3749)
Combustion
Timer, programmer, retarder or condition responsive control
By sensing of gas leakage, flashback or escaped flame
C431S006000, C431S013000, C431S016000, C431S076000, C122S504000
Reexamination Certificate
active
07112059
ABSTRACT:
An apparatus is provided for controlling the operation of a gas fired appliance having a gas valve circuit for enabling the flow of gas to the burner. The apparatus comprises a sensor capable of detecting the presence of flammable vapor, a switching means in series with the gas valve solenoid circuit for interrupting a thermocouple voltage to the gas valve solenoid to disable the flow of gas, and a fuse that normally conducts a current to the switching means to maintain the switching means in a conductive state for applying a thermocouple voltage to the gas valve solenoid. In response to the detection by the sensor of the presence of a predetermined level of flammable vapor concentration, a second switch supplies a higher current through the fuse. The higher current causes the fuse to blow and interrupt the current for maintaining the switching means in a conductive state, such that the switching means interrupts the thermocouple voltage applied to the gas valve solenoid to shut off the gas to the burner.
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Emerson Electric Co.
Harness Dickey & Pierce PLC
Price Carl D.
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