F - Mech Eng,Light,Heat,Weapons – 24 – H
Patent
F - Mech Eng,Light,Heat,Weapons
24
H
F24H 9/18 (2006.01) F24H 1/20 (2006.01)
Patent
CA 2713333
A water heater includes an air intake assembly that includes a blower for providing primary and secondary air to a combustion chamber at pressures above atmospheric pressure. The primary air is mixed with gaseous fuel and the mixture is combusted at a burner in a partially premixed but substantially diffusion flame having an envelope. Combustion of the mixture is completed within the envelope in the presence of secondary air at elevated pressure. A 24 V controller provides power to a user interface and a powered anode in the tank. The controller receives input from a pressure sensor in the air intake assembly, a flame sensor in the combustion chamber, and a flammable vapor sensor outside the water heater. The controller controls operation of the blower and a gas valve. A flue and baffle arrangement in the tank causes products of combustion from the burner to lose pressure and vent at near atmospheric pressure at the top of the flue. An air distributor plate creates a substantially uniform distribution of pressurized secondary air within the combustion chamber.
A.o. Smith Corporation
Smart & Biggar
LandOfFree
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