Apparatus and method for shutting down a fuel fired appliance

Details Apparatus and method for shutting down a fuel fired appliance Apparatus and method for shutting down a fuel fired appliance

2006-08-01

2006-08-01

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

07083408

ABSTRACT:
An apparatus comprising a switch, a fuse, and a sensor that is capable of detecting the presence of flammable vapors and responsively changing in resistance, wherein the sensor enables the switch to supply current to the fuse which opens to shut down an appliance burner. The fuse is connected in series with a control circuit that enables a gas valve to supply gas to the burner65. The apparatus comprises a voltage divider circuit that includes the sensor, which upon exposure to flammable vapors, increases in resistance to provide a voltage input to the gate of a FET100. The FET switches on and conducts a current that blows the fuse to interrupt the appliance burner control circuit and shut down burner operation.

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