F - Mech Eng,Light,Heat,Weapons – 23 – L
Patent
F - Mech Eng,Light,Heat,Weapons
23
L
F23L 3/00 (2006.01) F23D 14/72 (2006.01) F23L 13/00 (2006.01) F23N 3/04 (2006.01) F24H 9/00 (2006.01) F24H 9/20 (2006.01) F23N 5/24 (2006.01)
Patent
CA 2280666
A fuel-fired water heater has a combustion chamber disposed above a wall structure forming a flow path for combustion air being drawn into the combustion chamber during firing of the fuel burner portion of the water heater. A combustion air shutoff system is incorporated in the water heater and functions to sense an undesirably high firing temperature in the combustion chamber and responsively shut off essentially all further air flow to the combustion chamber and thereby terminate combustion therein. In various disclosed embodiments thereof, the combustion air shutoff system includes a damper member movable between an open position in which its permits air flow through the combustion air flow path, and a closed position which it blocks essentially further air flow through the combustion airflow path. The damper is releasably held in its open position by a eutectic metal fusible link member positioned exteriorly adjacent an exterior wall of the combustion chamber. When a predetermined high limit firing temperature is reached within the combustion chamber, the correspondingly increased temperature of the combustion chamber wall melts the fusible link member. In response, the shutoff system causes the damper to move to its closed position to terminate essentially all further flow of combustion air through the combustion air flow path into the combustion chamber.
Hall Jacob H.
Harrigill William T.
Blake Cassels & Graydon Llp
Rheem Manufacturing Company
The Water Heater Industry Joint Research And Development Consort
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