Gas or oil fired heat exchanger for forced air heating unit

Claim 2

A heat exchanger for a forced air heating unit comprising: a. an elongated combustion chamber having a burner receiving opening in one end thereof and a pair of spaced ducts leading from the other end thereof; b. first and second spaced headers connected to said ducts; c. a third header positioned adjacent said one end of said combustion chamber; d. a fourth header having a flue gas outlet therein positioned between said first and second headers; e. a plurality of tubes connected between said third header and said other headers to provide a combustion gas flow path from said chamber through said ducts into said first and second headers, then through certain of said tubes to said third header, and then through the remaining tubes to said fourth header for discharge therefrom; and f. said heat exchanger being mounted in a plenum chamber of a forced air heating unit for passage of air thereover, the mounting means including a first plurality of mounting legs connected between a support surface of said unit and said second header, and a second plurality of mounting legs supporting said third header on said support surface so as to permit relative lateral movement therebetween, and further including said fourth header and said one end of said combustion chamber being connected to said unit.

Claim 3

A heat exchanger for a forced air heating unit comprising: a. an elongated combustion chamber having a burner receiving opening in one end thereof and a pair of spaced ducts leading from the other end thereof; b. first and second spaced headers connected to said ducts; c. a third header positioned adjacent said one end of said combustion chamber; d. a fourth header having a flue gas outlet therein positioned between said first and second headers; e. a plurality of tubes connected between said third header and said other headers to provide a combustion gas flow path from said chamber through said ducts into said first and second headers, then through certain of said tubes to said third header, and then through the remaining tubes to said fourth header for discharge therefrom; f. said heat exchanger being mounted in a plenum chamber of a forced air heating unit for passage of air thereover, with the air first passing over said combustion chamber and then over said headers and tubes; and g. elongated air deflecting vanes being mounted to the outer surface of said combustion chamber to direct the flow of air thereover.

Claim 4

A heat exchanger for a forced air heating unit comprising: a. an elongated combustion chamber having a burner receiving opening in one end thereof and a pair of spaced ducts leading from the other end thereof; b. first and second spaced headers connected to said ducts; c. a third header positioned adjacent said one end of said combustion chamber; d. a fourth header having a flue gas outlet therein positioned between said first and second headers; e. a plurality of tubes connected between said third header and said other headers to provide a combustion gas flow path from said chamber through said ducts into said first and second headers, then through certain of said tubes to said third header, and then through the remaining tubes to said fourth header for discharge therefrom; f. said heat exchanger being mounted in a plenum chamber of a forced air heating unit for passage of air thereover, with the air first passing over said combustion chamber and then over said headers and tubes; and g. elongated air deflecting vanes being mounted to the outer surface of said combustion chamber to direct the flow of air thereover.

Claim 5

The apparatus of claim 2 wherein said combustion chamber is hexagonal in cross section and is mounted to have horizontal, parallel upper and lower wall surfaces.

Claim 6

The apparatus of claim 3 wherein said vanes are mounted along and spaced from the length of said heat exchanger at edges of said upper and lower surfaces, each of said vanes comprising two flat portions forming an obtuse angle with respect to each other, corresponding generally to the angle between adjacent wall surfaces of said combustion chamber.

Claim 7

A heat exchanger for a forced air heating unit comprising: a. an elongated combustion chamber having a burner receiving opening in one end thereof and a pair of spaced ducts leading from the other end thereof; b. first and second spaced headers connected to said ducts; c. a third header positioned adjacent said one end of said combustion chamber; d. a fourth header having a flue gas outlet therein positioned between said first and second headers; e. a plurality of tubes connected between said third header and said other headers to provide a combustion gas flow path from said chamber through said ducts into said first and second headers, then through certain of said tubes to said third header, and then through the remaining tubes to said fourth header for discharge therefrom; f. said heat exchanger being mounted in a plenum chamber of a forced air heating unit for passage of air thereover, with the air first passing over said combustion chamber and then over said headers and tubes; g. a metal mounting flange connected to the periphery of said burner receiving opening having a first group of threaded studs extending outwardly therefrom, a mounting plate supported by said unit having openings therein to receive said first group of studs, a central burner receiving opening and a second group of threaded studs extending outwardly therefrom spaced closer to said burner receiving opening than said first group, and a burner assembly mounted on said second group of studs opposite said mounting plate from said heat exchanger, said heat exchanger and said burner assembly thereby being separately demountable from said mounting plate.

Claim 8

A heat exchanger for a forced air heating unit comprising: a. an elongated combustion chamber having a burner receiving opening in one end thereof and a pair of spaced ducts leading from the other end thereof; b. first and second spaced headers connected to said ducts; c. a third header positioned adjacent said one end of said combustion chamber; d. a fourth header having a flue gas outlet therein positioned between said first and second headers; e. a plurality of tubes connected between said third header and said other headers to provide a combustion gas flow path from said chamber through said ducts into said first and second headers, then through certain of said tubes to said third header, and then through the remaining tubes to said fourth header for discharge therefrom; f. said heat exchanger being mounted in a plenum chamber of a forced air heating unit for passage of air thereover, with the air first passing over said combustion chamber and then over said headers and tubes; g. a metal mounting flange connected to the periphery of said burner receiving opening having a first group of threaded studs extending outwardly therefrom, a mounting plate supported by said unit having openings therein to receive said first group of studs, a central burner receiving opening and a second group of threaded studs extending outwardly therefrom spaced closer to said burner receiving opening than said first group, and a burner assembly mounted on said second group of studs opposite said mounting plate from said heat exchanger, said heat exchanger and said burner assembly thereby being separately demountable from said mounting plate.

Claim 9

A heat exchanger for a forced air heating unit comprising: a. an elongated combustion chamber having a burner receiving opening in one end thereof and duct means leading from the other end thereof; b. first and second spaced headers connected to said duct means; c. a common header positioned adjacent said one end of said combustion chamber; d. a discharge header having a flue gas outlet therein positioned between said first and second headers; e. a plurality of tubes connected between said common header and said other headers to provide a combustion gas flow path; and f. said common header and one of said first and second headers being supported by a support surface of said unit, said burner receiving opening end of said chamber being connected to a support wall of said unit, and said discharge header being secured to a side wall of said unit, to provide the entire support of said heat exchanger in a plenum chamber of said unit.

Claim 10

A heat exchanger for a forced air heating unit comprising: a. an elongated combustion chamber having a burner receiving opening in one end thereof and duct means leading from the other end thereof; b. first and second spaced headers connected to said duct means; c. a common header positioned adjacent said one end of said combustion chamber; d. a discharge header having a flue gas outlet therein positioned between said first and second headers; e. a plurality of tubes connected between said common header and said other headers to provide a combustion gas flow path; and f. said common header and one of said first and second headers being supported by a support surface of said unit, said burner receiving opening end of said chamber being connected to a support wall of said unit, and said discharge header being secured to a side wall of said unit, to provide the entire support of said heat exchanger in a plenum chamber of said unit.

Claim 11

A heat exchanger for a forced air heating unit comprising: a. An elongated combustion chamber having a burner receiving opening in one end thereof and a pair of spaced ducts leading from the other end thereof; and b. a header and tube assembly comprising: i. first and second spaced headers connected to said ducts, providing the sole connection between said combustion chamber and said header and tube assembly to permit different rates of expansion and contraction thereof; ii. a third header positioned adjacent said one end of said combustion chamber; iii. a fourth header having a flue gas outlet therein positioned between said first and second headers; and iv. a plurality of tubes connected between said third header and said other headers to provide a combustion gas flow path from said chamber through said ducts into said first and second headers, then through certain of said tubes to said third header and then through the remaining tubes to said fourth header for discharge therefrom, said fourth header being connected to said header and tube assembly solely by said remaining tubes to thereby permit a different rate of expansion and contraction thereof with respect to said certain of said tubes and said first and second headers.

Claim 12

A heat exchanger for a forced air heating unit comprising: a. An elongated combustion chamber having a burner receiving opening in one end thereof and a pair of spaced ducts leading from the other end thereof; and b. a header and tube assembly comprising: i. first and second spaced headers connected to said ducts, providing the sole connection between said combustion chamber and said header and tube assembly to permit different rates of expansion and contraction thereof; ii. a third header positioned adjacent said one end of said combustion chamber; iii. a fourth header having a flue gas outlet therein positioned between said first and second headers; and iv. a plurality of tubes connected between said third header and said other headers to provide a combustion gas flow path from said chamber through said ducts into said first and second headers, then through certain of said tubes to said third header and then through the remaining tubes to said fourth header for discharge therefrom, said fourth header being connected to said header and tube assembly solely by said remaining tubes to thereby permit a different rate of expansion and contraction thereof with respect to said certain of said tubes and said first and second headers.