초록 ▼

A gas fired appliance measures infrared emissions from a metal object heated in a combustion chamber to evaluate combustion. Associated circuitry uses the evaluation to control operational parameters of the appliance, including fuel and air fed to the appliance. A second metal object, prior to fuel

A gas fired appliance measures infrared emissions from a metal object heated in a combustion chamber to evaluate combustion. Associated circuitry uses the evaluation to control operational parameters of the appliance, including fuel and air fed to the appliance. A second metal object, prior to fuel ignition, is electrically heated to emit infrared radiation. Infrared emissions from the second metal object, indicative of the temperature thereof, are monitored to assure an ignition temperature to ignite a combustible air and fuel mixture. A fan directs a stream of ambient air upon the second metal object to cool the same and reduce the infrared emanating therefrom. The reduction in infrared from the second metal object is monitored to verify proper fan operation.

대표청구항 ▼

An appliance fired by a combustible gas mixture producing combustion flames upon ignition, and comprising: means for supplying said combustible gas mixture; means having a hot surface for igniting the combustible gas mixture to produce said combustion flames, said hot surface consisting essentially

An appliance fired by a combustible gas mixture producing combustion flames upon ignition, and comprising: means for supplying said combustible gas mixture; means having a hot surface for igniting the combustible gas mixture to produce said combustion flames, said hot surface consisting essentially of a metal material; and means for shifting said combustion flames away from said hot surface subsequent to ignition of the combustible mixture.