Patent ID: 8516878
Filing Date: 2013-08-27
Classification: F23N

Abstract:
1. A dual fuel heater comprising: a housing at least partially defining the dual fuel heater; a combustion chamber within the housing for combustion of either the first gas, liquid, or combination thereof or the second gas, liquid, or combination thereof; at least one nozzle configured to direct either the first gas, liquid, or combination thereof or the second gas, liquid, or combination thereof to the combustion chamber; a first oxygen depletion sensor nozzle configured to deliver the first gas, liquid, or combination thereof for combustion at or near the combustion chamber; a first electrode configured to instigate combustion of the first gas, liquid, or combination thereof from the first oxygen depletion sensor nozzle; a second oxygen depletion sensor nozzle configured to deliver a second gas, liquid, or combination thereof for combustion, the first gas, liquid, or combination thereof being different from the second gas, liquid, or combination thereof at or near the combustion chamber; a second electrode configured to instigate combustion of the second gas, liquid, or combination thereof from the second oxygen depletion sensor nozzle; a frame for positioning the first oxygen depletion sensor nozzle, the first electrode, the second oxygen depletion sensor nozzle, and the second electrode all within the housing, wherein the frame positions the first electrode closer to the first oxygen depletion sensor nozzle than to the second oxygen depletion sensor nozzle and the frame positions the second electrode nearer to the second oxygen depletion sensor nozzle than to the first oxygen depletion sensor nozzle; and an igniter switch to activate the first and second electrodes; wherein the frame is attached to the combustion chamber to position the first oxygen depletion sensor nozzle, the first electrode, the second oxygen depletion sensor nozzle, and the second electrode in proximity to the combustion chamber within the housing.