Fuel-fired heating appliance with combustion air shutoff system having frangible temperature sensing structure
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United States of America Patent
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-
Apr 6, 2004
Grant Date -
Jan 2, 2003
app pub date -
Jul 22, 2002
filing date -
Mar 8, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A gas-fired water heater has a combustion chamber with a bottom wall defined by a perforated flame arrestor plate forming a portion of a flow path through which combustion air may be supplied to a burner structure within the combustion chamber. During firing of the water heater a combustion air shutoff system having a heat-frangible temperature sensing structure disposed within the combustion chamber senses an undesirable temperature increase in the combustion chamber, caused by for example a partial blockage of the flow path, and responsively terminates further air flow into the combustion chamber, thereby shutting down the burner, prior to the creation in the combustion chamber of a predetermined elevated concentration of carbon monoxide.
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