Patent ID: 6957628
Filing Date: 2005-10-25
Classification: F23D,F23N,F24H

Abstract:
1. Fuel-fired heating apparatus comprising: a combustion chamber thermally communicatable with a fluid to be heated; combustion apparatus operative to burn a fuel-air mixture within said combustion chamber; a fuel supply valve operatively associated with said combustion apparatus; and a combustion shutoff system operative to sense a temperature in said combustion chamber and responsively terminate further combustion therein in response to said temperature reaching a level correlated to and indicative of a predetermined, undesirably high concentration of carbon monoxide present in said combustion chamber, said combustion shutoff system being operative to directly sense said temperature within said combustion chamber and including a temperature sensing structure extending into the interior of said combustion chamber, said temperature sensing structure including a eutectic element meltable at said temperature, and said combustion shutoff system being operative to close said fuel supply valve in response to melting of said eutectic element, said temperature sensing structure forming a movable portion of a normally closed switch separate from said eutectic element and electically coupled to said fuel supply valve, melting of said eutectic element causing movement of said movable switch portion and a responsive closure of said fuel supply valve.