Patent ID: 6758208
Filing Date: 2004-07-06
Classification: F24H

Abstract:
A compact, highly flexible and efficient, multi-positionable and multi-dimensional gas-fired multi-stage heat exchanger system for use in a forced air duct, said heat exchanger comprising a plurality of heat transfer tubes, said tubes being provided in numbers depending on the desired BTU/h capacity needs of said heat exchanger, said tubes being secured to a support means, a plurality of gas burners, each gas burner mounted on said support means and disposed for directing a flame at an inlet opening of an associated one of said heat transfer tubes, a gas distribution manifold for supplying gas to said burners, a position orientable modulating gas valve secured to said manifold and connectable to a gas supply line for controlling the gas pressure to said burners and therefore the intensity of the flame, said gas valve being disposed horizontal regardless of the angular position of said system when secured to a duct, a plurality of solenoid valves secured to said manifold and to a respective one of said burners whereby to operate said burners independently from one another, said tubes each having an outlet connected to combustion products collector housing having an exhaust fan to evacuate said combustion products and a system programmed controller means connected to an external heating demand device for receiving an input signal therefrom dependent on an air temperature requirement, said solenoid valves being controlled by said controller means dependent on said input signal, to control the operation of said gas burners, said controller means controlling the fan capacity in an inversely proportional manner to the number of said gas burners in operation to ensure a constant supply of gas/air mixture in said tubes in operation whereby to obtain optimal combustion and maximum efficiency.