US3382860A

US3382860A - Gas wall heater

Info

Publication number: US3382860A
Application number: US550825A
Authority: US
Inventors: Robert R Cooper; Anthony M Castello
Original assignee: Coleman Co Inc
Current assignee: Coleman Co Inc
Priority date: 1966-05-17
Filing date: 1966-05-17
Publication date: 1968-05-14
Anticipated expiration: 1985-05-14

Description

y 1968 R. R. COOPER ETAL 3,382,860

GAS WALL HEATER 2 Sheets-Sheet 1 Filed May 17, 1966 FIG. I

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INVENTOR$Z ROBERT R. COOPER ANTHONY M. CASTELLO flwm ii /alm flg fl/ md ATT'YS y 968 R. R. COOPER ETAL 3,382,860

GAS WALL HEATER 2 Sheets-Sheet 2 Filed May 17, 1966 V O O INEN'TORS: ROBERT R. COOPER ANTHONY lVl. CASTELLQ BY: 0 g gf wdi ATT' YS United States Patent m 3,382,860 GAS WALL HEATER Robert R. Cooper and Anthony M. Castelio, Wichita, Kans., assiguors to The Coleman Company, Inc., Wichita, Kans., a corporation of Kansas Filed May 17, 1966, Ser. No. 550,825 4 Claims. (Cl. 126-35) ABSTRACT OF THE DISCLOSURE A sealed combustion gas wall heater. The heater includes a combustion chamber having a burner access opening. A burner access door is attached to the cornbustion chamber and seals the burner access opening. The main burner is mounted on the burner access door and is provided with a gas inlet opening which is slidably received on the gas supply tube when the door is attached to the combustion chamber. U

Background of the invention This invention relates to gas wall heaters, and more particularly, to sealed combustion gas wall heaters of the through-the-wall type.

In a sealed combustion gas heater, the combustion chamber is hermetically sealed, and the combustion system is so designed that all combustion air required for the burner is drawn from outside the room in which the heater is located, and all flue products are discharged outside the room. It is mandatory that the combustion chamber be airtight with the exceptions of the air inlet and the flue outlet so that flue products do not become mixed with fresh inlet air or do not become released into the room and so that the room air does not become mixed with inlet air. If the latter occurred, the air pressure balance within the combustion chamber would be upset and a main burner flame or pilot burner flame could be extinguished.

The largest opening in a sealed combustion heater is the opening provided for insertion of the main burner. This opening is, therefore, the most difficult to seal adequately, especially when the burner is readily removable for servicing and inspection. It is, therefore, an object of this invention to provide a sealed combustion gas heater with an easily removable main burner, which does not interfere with the isolating of the combustion unit. Another object of the invention is to provide a sealed combustion gas heater with a removable main burner which may be easily installed through an opening in the combustion chamber. A further object of the invention is to provide a main burner and burner access door assembly which may be easily attached to the combustion chamber of the heater in an airtight manner.

Further objects and advantages of the invention will be apparent as the specification proceeds.

The invention is explained in conjunction with the accompanying drawing in which FIG. 1 is a perspective view of a gas wall heater embodying the present invention;

FIG. 2 is a sectional view taken along the line 2-2 of FIG. 1;

FIG. 3 is a front elevational view of the heater with the front cover removed;

FIG. 4 is a perspective view of the heater showing the main burner in the process of installation;

3,332,860 Patented May 14, 1968 FIG. 5 is a sectional view taken along the line 55 of FIG. 3;

FIG. 6 is a sectional view taken along the line 66 of FIG. 3;

FIG. 7 is an elevational view of the main burner.

Referring now to the drawing, and particularly FIGS. 1 and 2, the number 10 designates generally a sealed combustion gas heater installed in place against a wall of a room to be heated. The heater 10 includes an outer frame 11 and a removable front cover '12. The top of the frame 11 is provided with exhaust vents 13 and the cover 12 is provided with inlet vents 14 and exhaust vents 15.

Attached to the frame 11; and extending through wall 16 is cylindrical inlet air collar 17. (See FIG. 2.) The outside end of the inlet air collar 17 is bent outwardly to form fiange 18.

Spot-welded to the frame 11 is combustion chamber support wall 19 having openings 20 and 21 provided therein. Spot-welded to the combustion chamber support wall are

brackets

22 and 23. Combustion chamber casing 24, which provides a combustion chamber therein, is attached to

brackets

22 and 23 by means of screws. Extending outwardly from the casing 24 and communicating with the combustion chamber are inlet air tube 25 and flue collar 26 which are received in the openings 20 and 21, respectively. Gaskets 27 and 28 may be provided to insure a tight fit between the inlet air tube and flue collar and the wall 19 and also to avoid metal-to-metal contact of these parts.

Slidably received on the flue collar 26 in tight connection therewith is vent hood 29, which is also attached to the flange 18 by screws.

As seen most clearly in FIGS. 3 and 4, the combustion chamber casing 24 is provided with an opening 30. The periphery of opening 30 is defined by a perimetric boss 31, as shown in FIG. 5.

Channels

32 and 33 are welded to the casing 24 above and below the opening 36. Burner access door 34 is removably secured to the

channels

32 and 33 by means of screws 35, and asbestos gasket 36 may be provided to insure an air-tight seal between the burner access door 34 and the boss 31.

The

channels

32 and 33 not only provide attachment means for the burner access door 34 but also reinforce and straighten the combustion chamber casing 24 in the critical area of the opening 30. The channels also provide a unique method of complying with American Gas As sociation Construction Requirements which dictate that there shall be no screws projecting into gas passageways. Thus, the door could not be screwed directly into the casing but may be screwed to the channels. The alternative to providing the channels would be to projectionweld outwardly extending bolts to the casing, but this is undesirable if the casing is to be covered with a vitreous finishing coating because the bolts would become covered with frit. Consequently, the threads would have to be brushed clean or chased with a die. The use of bolts would also interfere with the unique method of attachment of the burner access door to the casing, as will be described more fully below.

Main burner 37 is attached at one end thereof to the burner access door by means of bracket 38 which re ceives support 39 of the main burner (see FIG. 7) and is secured thereto by means of a screw. The other end of the main burner is provided with a pin 40 which is received by slot 41 provided in bracket 42 which is secured to the burner access door. (See FIG. 6.) The pin end of the main burner is thus capable of a horizontal swinging movement of about in each direction.

The gas inlet portion 37a of the main burner is provided with an outwardly extending support arm 43 having an opening 44 provided therein. The outside edge of the opening 44 is chamfered at a 45 angle, and the opening receives gas supply tube 45 which is mounted on the combustion chamber casing 24 and extends inwardly into the combustion chamber. A gas supply (not shown) is connected to the gas supply tube so that gas may be introduced into main burner when desired. The main burner 37 may also be provided with a gas deflector 46 to insure distribution of gas along the entire burner surface, which is provided with transverse, spaced-apart slots 37b.

Extending outwardly from the burner access door 34 and formed integrally therewith is lighter door portion 47 (see FIGS. 3, 5 and 6), having a downwardly sloping face 47a and an upwardly sloping face 471:. Removably secured to the downwardly sloping face 47a by means of screws 48, is lighter door 49, which is provided with a. glass window 50.

Pilot burner 51 and thermocouple 52 extend upwardly and inwardly into the combustion chamber through an opening in the upwardly sloping face 47b, and the pilot burner is removably secured to face 47b by nut 53. Pilot gas tube 54 supplies gas to the pilot burner. (See FIG. 6.) The thermocouple is similarly removably secured to face 47b.

If the main burner is mounted on the burner access door, the pilot burner must also be mounted on the burner access door because the American Gas Association Approval Requirements provide that the main burner and pilot burner must maintain a fixed relationship at all times. Mounting the pilot burner and thermocouple on the burner access door provides the additional advantages of having the pilot gas line and the cold junction of the thermocouple outside of the combustion chamber.

Operation After the gas wall heater 10 is installed in place with the inlet air collar \17 and flue collar 26 extending through the wall, the heater may be prepared for operation merely by pressing the burner access door 34 against the opening of the combustion chamber 24 and sliding the door to the right (see FIG. 3) so that the support arm 43 of the main burner 37 is received on the gas supply tube 45. Because of the chamfered edge of opening 44 and the pin-in-slot support provided for the end of the main burner bearing the support arm, the opening may easily be aligned with the gas supply tube. Screws 35 may then secure the burner access door 34 to the

channels

32 and 33, thereby effecting an airtight seal of the opening 30 by virtue of the pressure exerted on the compressible gasket 36 by the door 34 and the boss 31 (see FIG. 5

The lighter door 49 is then removed, and gas may be introduced through the pilot gas tube 54 from a suitable supply source (not shown). The pilot burner may then be ignited and the lighter door 49 replaced on the burner access door. After the initial ignition of the pilot burner, the pilot burner serves to ignite the main burner whenever desired. The thermocouple 52 serves to prevent the introduction of gas into the main burner when the pilot burner is extinguished, as is well known in the art. Gas is supplied to the main burner by gas supply tube 45, and the amount of gas supplied may be regulated as desired by means of a conventional gas adjusting screw.

The operation of the main burner and the pilot burner may be conveniently viewed by a person maintaining an upright position by looking through the window 5t provided in the downwardly sloping face 47a. After the pilot burner is ignited, the cover 12 may be positioned on the frame 11.

After the main burner is ignited and the combustion chamber casing is heated, the hot air surrounding the casing rises through the exhaust vents 13 and 15 (see FIG. 2) and cold air is forced through the inlet vents 14 to be heated by the casing. The room is thus heated by gravity circulation of the air.

The main and pilot burners and the thermocouple occasionally require servicing, and the inventive construction enables these parts to be quickly and easily removed and then later reattached. If only the pilot burner or thermocouple needs servicing, either of these parts may be removed from the burner access door without removing the door from the combustion chamber casing.

From the foregoing, it is seen that a gas wall heater has been designed which enjoys all of the advantages of a sealed combustion system but does not suffer from the disadvantages of independent mounting for the main burner and pilot burner and the consequent difficulties in effecting an airtight closure of the combustion chamber. A unique construction has been provided which calls for mounting the main burner and pilot burner directly on the closure door of the combustion chamber, thereby permitting fast and easy insertion and removal of the burner assembly as a unit.

While in the foregoing specification, a detailed description of a specific embodiment of the invention has been set forth, it is to be understood that many of the details herein given may be varied considerably by those skilled in the art without departing from the scope and spread of the invention.

We claim:

1. In a sealed combustion gas heater, a casing having a front, a back and opposite sides, said casing providing a combustion chamber and having a generally rectangular opening in the front thereof extending transversely of said sides, a burner access door removably secured to said casing in covering relationship with said opening, a gas supply tube extending inwardly through one of said sides of said easing into said chamber, an elongated main burner attached to said burner access door and having a gas inlet opening, said gas inlet opening being slidably received on said gas supply tube, the length of said main burner being less than the distance between the inwardlyextending end of said gas supply tube and the other of said sides of said casing, a pair of brackets attached to said burner access door, one of said brackets also being attached to one end of said main burner and the other of said brackets providing a platform support for the other end of said main burner, whereby said main burner may be inserted through said transversely extending opening and moved transversely of said sides toward said gas supply tube so that said gas inlet opening may be received on said gas supply tube, said other burner end being movable in a plane transverse to said sides as said main burner is moved towand said gas supply tube.

2. In a sealed combustion gas heater, a casing having front, back, and opposite side walls providing a combustion chamber, said front wall having a generally rectangular opening in the front thereof extending transversely of said side walls, a gas supply tube mounted on one of said side walls and extending inwardly into said combustion chamber, a burner access door removably secured to said casing front wall in covering relationship with said opening, an elongated main burner attached to said burner access door and having a gas inlet opening, said main burner extending transversely of said walls and said gas inlet opening slidably receiving said gas supply tube, the length of said main burner being less than the distance between the inwardly extending end of said gas sup ply tube and the other of said casing side walls, whereby said main burner may be inserted through said transversely extending opening and moved transversely of said side walls toward said gas supply tube so that said gas inlet opening may be received by said gas supply tube.

5 6 3. The gas heater of claim 2 in which one end of said References Cited main burner is slidably mounted on said access door to UNITED STATES PATENTS permit limited movement of said main burner end in a 1,153,871 9/1915 Lewls 1582 X jggg g gg gg zg mam burner 18 5 2,565,831 8/1951 white 15M X 4. The gas heater of claim 2 including a pilot burner 2'964034 12/1960 Nordholt et 126 85 and a thermocouple mounted on said burner access door FOREIGN PATENTS and extend ng through said door into sald combustion 1,356,278 2/1964 France.

chamber, sa1d thermocouple lncluding a cold unction positioned outside of said combustion chamber, and a pilot 0 FREDERICK L MATTESON, JR Primary Examiner gas line connected to said pilot burner outside of said combustion chamber. E. G. FAVORS, ASSISMIIZ Exammer.