Lennox Industries Inc.

Rodney S Roan

Mark R Rakowski

Myron C Oglesby, Jr

A furnace is adapted for operation in downflow, left horizontal flow and right horizontal flow positions. The furnace includes plural burners, a two-stage heat exchanger, a header box at the heat exchanger outlet for collecting products of combustion from the heat exchanger, and an inducer for inducing a flow of products of combustion through the heat exchanger. A condensate drain and trap are also provided for draining condensation from the header box and from an exhaust vent through which products of combustion are exhausted from the furnace. In accordance with one feature of the invention, a manifold is located inside the header box to divide the header box into first and second chambers. A pressure sensor senses differential fluid pressure between the first and second chambers for detecting a blocked condensate drain condition. In accordance with another feature of the invention, an intake air manifold located between a combustion air intake duct and an enclosure housing the burners includes opposed inlet openings and an outlet opening. A perforated baffle is positioned between the inlet openings for interrupting air flow between the inlet openings and cooperates with another perforated baffle in the burner enclosure to distribute combustion air to the burners. In accordance with still another feature of the invention, the furnace is provided with a condensate trap which is operable either in a vertical or a horizontal orientation, depending upon the position of the furnace. The trap is always installed in the same position relative to a furnace connector fitting, but is operable in either a vertical or horizontal orientation to accommodate both downflow and horizontal flow operation of the furnace.

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Carrollton, TX, United States of America

Rodney S Roan