US20070237501A1 - Water heater for recreational vehicles having forced air/direct vent combustion - Google Patents
Water heater for recreational vehicles having forced air/direct vent combustion Download PDFInfo
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- US20070237501A1 US20070237501A1 US11/398,282 US39828206A US2007237501A1 US 20070237501 A1 US20070237501 A1 US 20070237501A1 US 39828206 A US39828206 A US 39828206A US 2007237501 A1 US2007237501 A1 US 2007237501A1
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- Prior art keywords
- water
- recreational vehicle
- combustion
- combustion chamber
- water heater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/18—Water-storage heaters
- F24H1/20—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes
- F24H1/205—Water-storage heaters with immersed heating elements, e.g. electric elements or furnace tubes with furnace tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
- F23N1/082—Regulating fuel supply conjointly with another medium, e.g. boiler water using electronic means
Definitions
- the present invention generally relates to water heaters and, more particularly, to gas-fired water heaters for recreational vehicles and the like.
- Compact water heaters of the type for use with recreational vehicles typically have a relatively small water tank in combination with a heating unit.
- the heating unit is typically of the gas-fired burner type.
- the burner can be fueled by propane gas which is usually carried on recreational vehicles.
- the water heater is mounted on the recreational vehicle in a convenient position connected to cold water supply and hot water outlet pipes respectively receiving cold water from a suitable water supply source and for directing heated water for use in cooking, bathing, and the like.
- a water heater for a recreational vehicle comprises, in combination, an enclosure assembly, a water tank for holding water to be heated located within the enclosure assembly, a combustion system for heating water within the water tank, and a control system for operating the combustion system.
- the combustion assembly includes a gas-fired burner assembly located within a sealed combustion chamber, a combustion air inlet duct communicating an external environment with the combustion chamber, a flue gas outlet duct communicating the combustion chamber with the external environment and extending near the water tank to transfer heat to water within the water tank, and an electric fan positioned to draw combustion air through the inlet duct and into the combustion chamber and force flue gas into the outlet duct and out of the combustion chamber.
- the control system includes a thermostat and is operably connected to the burner assembly, the fan, and the thermostat to generally maintain water in the water tank at a desired temperature.
- a water heater for a recreational vehicle comprises, in combination, an enclosure assembly, a water tank for holding water to be heated located within the enclosure assembly, a combustion system for heating water within the water tank, and a control system for operating the combustion system.
- the combustion system includes a gas-fired burner assembly located within a sealed combustion chamber, a combustion air inlet duct communicating an external environment with the combustion chamber, and a flue gas outlet duct communicating the combustion chamber with the external environment and extending near the water tank to transfer heat to water within the water tank.
- the control system includes a thermostat and is operably connected to the burner assembly and the thermostat to generally maintain water in the water tank at a desired temperature. A portion of the flue gas outlet duct extends within the combustion air inlet duct.
- a water heater for a recreational vehicle comprises, in combination, an enclosure assembly, a water tank for holding water to be heated located within the enclosure assembly, a combustion system for heating water within the water tank, and a control system for operating the combustion system.
- the combustion assembly includes a gas-fired burner assembly located within a sealed combustion chamber, a combustion air inlet duct communicating an external environment with the combustion chamber, and a flue gas outlet duct communicating the combustion chamber with the external environment and extending near the water tank to transfer heat to water within the water tank.
- the control system for operating the combustion system includes a thermostat and is operably connected to the burner assembly and the thermostat to generally maintain water in the water tank at a desired temperature.
- the enclosure assembly is provided with a plurality of knockouts facing in different directions for forming an opening for the inlet and outlet ducts.
- FIG. 1 is a top plan view of a water heater for a recreational vehicle according to the present invention
- FIG. 2 is a side elevational view of the water heater of FIG. 1 ;
- FIG. 3 is a rear end elevational view of the water heater of FIGS. 1 and 2 ;
- FIG. 4 is a front end elevational view of the water heater of FIGS. 1 to 3 ;
- FIG. 5 is a bottom plan view of the water heater of FIGS. 1 to 4 ;
- FIG. 6 is a perspective view of the water heater of FIGS. 1 to 5 , wherein an exterior housing is removed for clarity;
- FIG. 7 is another perspective view of the water heater of FIGS. 1 to 6 , wherein a rear end cover is removed for clarity;
- FIG. 8 is a schematic view of the forced air/direct vent combustion system of the water heater of FIGS. 1 to 7 ;
- FIG. 9 is a schematic view of a control system of the water heater of FIGS. 1 to 8 .
- down or downward refers to a downward direction within the plane of the paper in FIG. 2 .
- fore or forward refers to a direction toward the left within the plane of the paper in FIG. 2 and aft or rearward refers to a direction toward the right within the plane of the paper in FIG. 2 .
- FIGS. 1 to 7 show a water heater 10 for a recreational vehicle 12 according to a preferred embodiment of the present invention.
- the illustrated water heater 10 includes an enclosure assembly 14 , a water tank 16 within the enclosure assembly 14 , forced air/direct vent combustion system 18 for heating water within the water tank 16 , and a control system 20 for operating the combustion system 18 .
- the illustrated enclosure assembly 14 includes a base 22 , a forward end wall or bulkhead 24 , a rear end wall or bulkhead 26 , and a main cover 28 .
- the illustrated base 22 is generally rectangular-shaped, having a length greater than its width, and planar and is provided with mounting brackets 30 at forward and rearward ends.
- the mounting brackets 30 are provided with opening for mechanical fasteners for securing the water heater 10 to a support structure of the recreational vehicle such as a floor.
- the illustrated forward end wall 24 is generally square shaped and planar.
- the forward end wall 24 perpendicularly extends in an upward direction from the forward end of the base 22 .
- the illustrated rearward end wall 26 is generally square shaped and planar.
- the rearward end wall 26 perpendicular extends in an upward direction from the rearward end of the base 22 .
- the illustrated rearward end wall 26 forms a sealed interior combustion chamber or cavity 32 therein.
- the illustrated rearward end wall 26 is provided with a removable end cover 34 that partially forms the combustion chamber 32 and selectively provides access to components located within the combustion chamber 32 as described in more detail hereinafter.
- the illustrated water tank 16 is generally cylindrically shaped having a horizontally disposed central axis extending between the end walls 24 , 26 .
- the water tank 16 is preferably provided with flanges to secure the water tank to the base 22 .
- the water tank 16 forms a hollow interior cavity for holding water to be heated.
- the water tank 16 is provided with a cold inlet pipe 36 for connection to a source of water to be heated and a hot outlet pipe 38 for directing hot water to a sink, shower etc.
- the illustrated inlet and outlet pipes 36 , 38 forwardly extend from the water tank 16 through openings in the forward end wall 24 .
- the illustrated water tank 16 is also provided with a drain pipe 40 that forwardly extends from the water tank 16 through an opening in the forward end wall 24 .
- the illustrated water tank 16 is further provided with a pressure/temperature (P/T) relief valve 42 that forwardly extends from the water tank 16 through an opening in the forward end wall 24 .
- P/T pressure/temperature
- the illustrated water tank 16 is moreover provided with motor assist inlet and outlet pipes 44 , 46 of an engine assisted heat exchanger.
- the inlet and outlet pipes 44 , 46 forwardly extend from the water tank 16 through openings in the forward end wall 24 .
- the illustrated combustion system 18 includes a burner assembly 48 , a gas inlet line 50 , a combustion air inlet duct 52 , an electric fan 54 , and a flue gas outlet duct 56 .
- the illustrated burner assembly 48 is located within the combustion chamber 32 and laterally extends across the lower end of the combustion chamber 32 .
- the illustrated burner assembly 48 generally extends between the gas inlet line 50 and an inlet opening of the flue gas outlet duct 56 .
- the burner assembly 48 can be of any suitable type for burning a desired gas to generate heat.
- the illustrated burner assembly 48 includes an electric igniter 58 .
- the illustrated gas inlet line 50 extends through a side of the rearward end wall 26 and into the sealed combustion chamber 32 to the burner assembly 48 .
- the illustrated enclosure assembly 13 is provided with a sight glass 60 located above the burner assembly 48 for viewing the burner assembly 48 when the combustion chamber 32 is completely enclosed by the enclosure assembly 14 .
- a baffle 62 within the rearward end wall 26 forms an inlet air chamber 64 .
- the illustrated combustion air inlet duct 52 is connected to a duct opening 66 in the side of the rearward end wall 26 that communicates a second or outlet end of the combustion air inlet duct 52 with the inlet air chamber 64 .
- the illustrated combustion air inlet duct 52 is generally tubular shaped and extends from the inlet air chamber 64 through an exterior wall 68 of the recreational vehicle 12 to ambient air located at the exterior of the recreational vehicle 12 . Configured in this manner the combustion air inlet duct 52 communicates ambient air at the exterior of the recreational vehicle 12 to the inlet air chamber 64 within the water heater 10 located within the interior of the recreational vehicle 12 .
- the illustrated electric fan 54 is located with the baffle 62 to communicate the inlet air chamber 64 with the sealed combustion chamber 32 .
- the electric fan 54 can be of any suitable type and is sized to draw a suitable amount of air from the air inlet chamber 64 to the sealed combustion chamber 32 to provide a desired pressure level within the sealed pressure chamber 32 .
- the illustrated flue gas outlet duct 56 is connected to an opening in the forward side of the rearward end wall 26 that communicates a first or inlet end of the outlet duct 56 with the sealed combustion chamber 32 near the burner assembly 48 .
- the flue gas outlet duct 56 extends adjacent the water tank 16 and then through an opening in the forward side of the rearward end wall 26 and into the air chamber 64 .
- the flue gas outlet duct 56 then extends through air chamber 64 into the combustion air inlet duct 52 where it extends to the exterior of the recreational vehicle 12 .
- the portion of the flue gas outlet duct 56 outside of the water heater enclosure assembly 14 is located within the combustion air inlet duct 52 and is coaxial with the combustion air inlet duct 52 .
- the flue gas outlet duct 56 forms a closed loop heat exchanger for the water tank 16 . It is noted that both ducts 52 , 56 extends through a single opening 72 within the exterior wall 68 of the recreational vehicle 12 . In this configuration, the flue gas may also preheat the incoming combustion air to some degree.
- the illustrated rearward end wall 26 is provided with three knockouts 74 for forming the duct opening 66 in one of three different locations facing different directions.
- the first knockout was located on a side of the rearward end wall 26 adjacent the inlet air chamber 64 and has been removed so that the attached ducts 52 , 56 extend laterally from the enclosure assembly 14 .
- the second knockout 74 is located at a top of the rear end wall 26 adjacent the inlet air chamber 64 so that the ducts 52 , 56 can alternatively extend upwardly from the enclosure assembly 14 .
- the third knockout 74 is located at a rear side of the rearward end wall 26 adjacent the inlet air chamber 64 so that the ducts 52 , 56 can extend longitudinally in a rearward direction from the enclosure assembly 14 .
- the knockouts 74 remain in place in the enclosure assembly 14 until installation when it is determined which direction the ducts 52 , 54 are to extend. The installer then “knocks-out” or removes the knockout 74 that provides the duct opening 66 facing the desired direction. The ducts 52 , 56 are then installed to extend in the desired direction.
- the same water heater 10 can be utilized in a number of different locations and orientations within recreational vehicles 12 .
- the illustrated control system 20 includes an ignition control or controller 76 , an electromechanical valve 78 , a pressure switch 80 , a thermostat 82 , and an emergency cut-off switch 84 .
- the ignition control 76 is provided with suitable electronics to control operation of the burner assembly 48 , the valve 78 , and the fan 54 in the desired manner.
- the ignition control 76 operably connects the ignition components to vehicle power.
- the illustrated ignition control 76 is operably connected to a 12 volt source but any other suitable type of source can alternatively be utilized.
- the illustrated burner igniter 58 is operably connected to a 110 volt source.
- the illustrated water heater 10 includes a 110 volt element 86 mounted to the front side of the forward end wall 24 but any other suitable power can alternatively be utilized.
- the illustrated electromechanical valve 78 connects the burner assembly 48 with the gas inlet line 50 to selectively supply gas to the burner assembly 48 .
- the ignition control 76 is operably connected to the fan 54 , the burner igniter 58 , and to the valve 78 .
- the pressure switch 80 detects pressure within the inlet air chamber 64 and the combustion chamber 32 to determine whether pressure within the combustion chamber 32 is at a predetermined desired pressure.
- the ignition control 76 passes voltage to the valve 78 to open the valve 78 and pass gas to the burner assembly 48 and to a relay 88 which passes voltage to the burner igniter 58 to start combustion of the gas at the burner assembly 48 .
- the ignition control 76 is regulated by the thermostat 82 and the emergency cut-off (ECO) switch 84 to obtain a desired temperature of the water within the water tank 16 .
- ECO emergency cut-off
- the ignition control 76 determines if the water temperature is at a desired temperature via the thermostat 82 . If it is determined that the water in the water tank 16 needs to be heated, the igniter control 76 passes voltage to the draft inducing fan 54 . Operation of the fan 54 pulls ambient air from the environment at the exterior of the recreational vehicle 12 through the combustion air inlet duct 52 and into the inlet air chamber 64 where it passes through the fan 54 and into the combustion chamber 32 .
- the igniter control 76 passes voltage to the valve 78 to open the valve 78 so that gas enters the gas inlet line 50 and passes to the burner assembly 48 .
- the igniter control 76 also passes voltage to the relay 88 which in turn passes voltage to the burner igniter 58 .
- the burner igniter 58 ignites the gas to create a combustion flame which burns the gas and the combustion air within the combustion chamber 32 .
- the draft inducing fan 54 forces the hot combustion gases out of the combustion chamber 32 and into the flue gas outlet duct 56 .
- the hot flue gas travels though the outlet duct 56 adjacent the water tank 16 and heats the water tank 16 which in turn convectively dissipates the heat to the water in the interior of the tank 16 .
- the flue gas continues though the outlet duct 56 until it exits the outlet duct 56 to the ambient environment at the exterior of the recreational vehicle 12 .
- the igniter control 76 stops and starts the burner assembly 48 to generally maintain the water in the water tank 16 at the desired temperature.
- the fan 54 thus creates forced air flow through the closed heat exchanger system so that the flue gas can be directly vented to the environment as desired.
- the system is not limited by the constraints of gravity flow.
- the present invention provides an improved water heater 10 that can be utilized in any position having access to an exterior wall such as a side wall, end wall, or ceiling wall and can be oriented either parallel or perpendicular to the exterior wall or the like. It is noted that the same water heater 10 can be utilized in recreational vehicles requiring different orientations or positions and requires only a single outlet opening.
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Abstract
Description
- Not Applicable
- Not Applicable
- Not Applicable
- The present invention generally relates to water heaters and, more particularly, to gas-fired water heaters for recreational vehicles and the like.
- Compact water heaters of the type for use with recreational vehicles typically have a relatively small water tank in combination with a heating unit. The heating unit is typically of the gas-fired burner type. The burner can be fueled by propane gas which is usually carried on recreational vehicles. The water heater is mounted on the recreational vehicle in a convenient position connected to cold water supply and hot water outlet pipes respectively receiving cold water from a suitable water supply source and for directing heated water for use in cooking, bathing, and the like.
- These gas-fired burners must be vented to the exterior of the vehicle. Typically, the water heater is located near an exterior wall of the recreational vehicle so that a door in the exterior wall can be used for gravity combustion, venting, and service. These doors, however, are considered aesthetic problems in the industry for color matching, their “postage stamp” appearance, and their contribution to cluttered exterior appearances of recreational vehicles.
- As a result some water heaters have been located inward of the exterior walls and are provided with an inlet duct in the floor and an outlet duct in the ceiling for gravity combustion and venting. While these water heaters may improve the outward appearance of the exterior walls, they impose other design constraints such as the water heater must be located where ducts can be provided through the floor and ceiling. In either case, these prior water heaters place considerable constraints on the design of the recreational vehicles. Much of the interior design must often be designed around the locations of appliances such as the water heater. Additionally, different water heaters must be used in different recreational vehicle designs which prevents the cost advantages of a “universal” design. Accordingly, there is a need in the art for an improved water heater for recreational vehicles.
- The present invention provides a water heater for a recreational vehicle which overcomes at least some of the above-noted problems of the related art. According to the present invention, a water heater for a recreational vehicle comprises, in combination, an enclosure assembly, a water tank for holding water to be heated located within the enclosure assembly, a combustion system for heating water within the water tank, and a control system for operating the combustion system. The combustion assembly includes a gas-fired burner assembly located within a sealed combustion chamber, a combustion air inlet duct communicating an external environment with the combustion chamber, a flue gas outlet duct communicating the combustion chamber with the external environment and extending near the water tank to transfer heat to water within the water tank, and an electric fan positioned to draw combustion air through the inlet duct and into the combustion chamber and force flue gas into the outlet duct and out of the combustion chamber. The control system includes a thermostat and is operably connected to the burner assembly, the fan, and the thermostat to generally maintain water in the water tank at a desired temperature.
- According to another aspect of the present invention, a water heater for a recreational vehicle comprises, in combination, an enclosure assembly, a water tank for holding water to be heated located within the enclosure assembly, a combustion system for heating water within the water tank, and a control system for operating the combustion system. The combustion system includes a gas-fired burner assembly located within a sealed combustion chamber, a combustion air inlet duct communicating an external environment with the combustion chamber, and a flue gas outlet duct communicating the combustion chamber with the external environment and extending near the water tank to transfer heat to water within the water tank. The control system includes a thermostat and is operably connected to the burner assembly and the thermostat to generally maintain water in the water tank at a desired temperature. A portion of the flue gas outlet duct extends within the combustion air inlet duct.
- According to yet another aspect of the present invention, a water heater for a recreational vehicle comprises, in combination, an enclosure assembly, a water tank for holding water to be heated located within the enclosure assembly, a combustion system for heating water within the water tank, and a control system for operating the combustion system. The combustion assembly includes a gas-fired burner assembly located within a sealed combustion chamber, a combustion air inlet duct communicating an external environment with the combustion chamber, and a flue gas outlet duct communicating the combustion chamber with the external environment and extending near the water tank to transfer heat to water within the water tank. The control system for operating the combustion system includes a thermostat and is operably connected to the burner assembly and the thermostat to generally maintain water in the water tank at a desired temperature. The enclosure assembly is provided with a plurality of knockouts facing in different directions for forming an opening for the inlet and outlet ducts.
- From the foregoing disclosure and the following more detailed description of various preferred embodiments it will be apparent to those skilled in the art that the present invention provides a significant advance in the technology and art of water heaters for recreational vehicles. Particularly significant in this regard is the potential the invention affords for providing a high quality, reliable, efficient, and low cost assembly that can be used in a wide variety of locations and in more than one location. Additional features and advantages of various preferred embodiments will be better understood in view of the detailed description provided below.
- These and further features of the present invention will be apparent with reference to the following description and drawings, wherein:
-
FIG. 1 is a top plan view of a water heater for a recreational vehicle according to the present invention; -
FIG. 2 is a side elevational view of the water heater ofFIG. 1 ; -
FIG. 3 is a rear end elevational view of the water heater ofFIGS. 1 and 2 ; -
FIG. 4 is a front end elevational view of the water heater of FIGS. 1 to 3; -
FIG. 5 is a bottom plan view of the water heater of FIGS. 1 to 4; -
FIG. 6 is a perspective view of the water heater of FIGS. 1 to 5, wherein an exterior housing is removed for clarity; -
FIG. 7 is another perspective view of the water heater of FIGS. 1 to 6, wherein a rear end cover is removed for clarity; -
FIG. 8 is a schematic view of the forced air/direct vent combustion system of the water heater of FIGS. 1 to 7; and -
FIG. 9 is a schematic view of a control system of the water heater of FIGS. 1 to 8. - It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various preferred features illustrative of the basic principles of the invention. The specific design features of a water heater for a recreational vehicle as disclosed herein, including, for example, specific dimensions, orientations, locations, and shapes will be determined in part by the particular intended application and use environment. Certain features of the illustrated embodiments have been enlarged or distorted relative to others to facilitate visualization and clear understanding. In particular, thin features may be thickened, for example, for clarity or illustration. All references to direction and position, unless otherwise indicated, refer to the orientation of the powered adjustable seat assembly illustrated in the drawings. In general, up or upward refers to an upward direction within the plane of the paper in
FIG. 2 and down or downward refers to a downward direction within the plane of the paper inFIG. 2 . Also in general, fore or forward refers to a direction toward the left within the plane of the paper inFIG. 2 and aft or rearward refers to a direction toward the right within the plane of the paper inFIG. 2 . - It will be apparent to those skilled in the art, that is, to those who have knowledge or experience in this area of technology, that many uses and design variations are possible for the improved water heaters disclosed herein. The following detailed discussion of various alternative and preferred embodiments will illustrate the general principles of the invention with reference to a preferred embodiment of a water heater for a recreational vehicle. The term “recreational vehicle” as use in the specification and claims is intended to include all vehicles which are generally permanently installed at a site but are transported along a roadway a subsequent site such as mobile homes as well as vehicles that are readily moved along roadways among sites such as recreational vehicles (RVs), travel trailers, campers, and the like. Other embodiments suitable for other applications will be apparent to those skilled in the art given the benefit of this disclosure.
- Referring now to the drawings, FIGS. 1 to 7 show a
water heater 10 for arecreational vehicle 12 according to a preferred embodiment of the present invention. The illustratedwater heater 10 includes anenclosure assembly 14, awater tank 16 within theenclosure assembly 14, forced air/directvent combustion system 18 for heating water within thewater tank 16, and acontrol system 20 for operating thecombustion system 18. - The illustrated
enclosure assembly 14 includes a base 22, a forward end wall orbulkhead 24, a rear end wall orbulkhead 26, and amain cover 28. The illustrated base 22 is generally rectangular-shaped, having a length greater than its width, and planar and is provided withmounting brackets 30 at forward and rearward ends. The mountingbrackets 30 are provided with opening for mechanical fasteners for securing thewater heater 10 to a support structure of the recreational vehicle such as a floor. The illustratedforward end wall 24 is generally square shaped and planar. Theforward end wall 24 perpendicularly extends in an upward direction from the forward end of the base 22. The illustratedrearward end wall 26 is generally square shaped and planar. Therearward end wall 26 perpendicular extends in an upward direction from the rearward end of the base 22. The illustratedrearward end wall 26 forms a sealed interior combustion chamber orcavity 32 therein. The illustratedrearward end wall 26 is provided with aremovable end cover 34 that partially forms thecombustion chamber 32 and selectively provides access to components located within thecombustion chamber 32 as described in more detail hereinafter. - The illustrated
water tank 16 is generally cylindrically shaped having a horizontally disposed central axis extending between theend walls water tank 16 is preferably provided with flanges to secure the water tank to the base 22. Thewater tank 16 forms a hollow interior cavity for holding water to be heated. Thewater tank 16 is provided with acold inlet pipe 36 for connection to a source of water to be heated and ahot outlet pipe 38 for directing hot water to a sink, shower etc. The illustrated inlet andoutlet pipes water tank 16 through openings in theforward end wall 24. The illustratedwater tank 16 is also provided with adrain pipe 40 that forwardly extends from thewater tank 16 through an opening in theforward end wall 24. The illustratedwater tank 16 is further provided with a pressure/temperature (P/T)relief valve 42 that forwardly extends from thewater tank 16 through an opening in theforward end wall 24. The illustratedwater tank 16 is moreover provided with motor assist inlet andoutlet pipes 44, 46 of an engine assisted heat exchanger. The inlet andoutlet pipes 44, 46 forwardly extend from thewater tank 16 through openings in theforward end wall 24. - The illustrated
combustion system 18 includes aburner assembly 48, agas inlet line 50, a combustionair inlet duct 52, anelectric fan 54, and a flue gas outlet duct 56. The illustratedburner assembly 48 is located within thecombustion chamber 32 and laterally extends across the lower end of thecombustion chamber 32. The illustratedburner assembly 48 generally extends between thegas inlet line 50 and an inlet opening of the flue gas outlet duct 56. Theburner assembly 48 can be of any suitable type for burning a desired gas to generate heat. The illustratedburner assembly 48 includes anelectric igniter 58. The illustratedgas inlet line 50 extends through a side of therearward end wall 26 and into the sealedcombustion chamber 32 to theburner assembly 48. The illustrated enclosure assembly 13 is provided with asight glass 60 located above theburner assembly 48 for viewing theburner assembly 48 when thecombustion chamber 32 is completely enclosed by theenclosure assembly 14. - A
baffle 62 within therearward end wall 26 forms aninlet air chamber 64. The illustrated combustionair inlet duct 52 is connected to a duct opening 66 in the side of therearward end wall 26 that communicates a second or outlet end of the combustionair inlet duct 52 with theinlet air chamber 64. The illustrated combustionair inlet duct 52 is generally tubular shaped and extends from theinlet air chamber 64 through an exterior wall 68 of therecreational vehicle 12 to ambient air located at the exterior of therecreational vehicle 12. Configured in this manner the combustionair inlet duct 52 communicates ambient air at the exterior of therecreational vehicle 12 to theinlet air chamber 64 within thewater heater 10 located within the interior of therecreational vehicle 12. - The illustrated
electric fan 54 is located with thebaffle 62 to communicate theinlet air chamber 64 with the sealedcombustion chamber 32. Theelectric fan 54 can be of any suitable type and is sized to draw a suitable amount of air from theair inlet chamber 64 to the sealedcombustion chamber 32 to provide a desired pressure level within the sealedpressure chamber 32. - The illustrated flue gas outlet duct 56 is connected to an opening in the forward side of the
rearward end wall 26 that communicates a first or inlet end of the outlet duct 56 with the sealedcombustion chamber 32 near theburner assembly 48. The flue gas outlet duct 56 extends adjacent thewater tank 16 and then through an opening in the forward side of therearward end wall 26 and into theair chamber 64. The flue gas outlet duct 56 then extends throughair chamber 64 into the combustionair inlet duct 52 where it extends to the exterior of therecreational vehicle 12. Thus, the portion of the flue gas outlet duct 56 outside of the waterheater enclosure assembly 14 is located within the combustionair inlet duct 52 and is coaxial with the combustionair inlet duct 52. The flue gas outlet duct 56 forms a closed loop heat exchanger for thewater tank 16. It is noted that bothducts 52, 56 extends through asingle opening 72 within the exterior wall 68 of therecreational vehicle 12. In this configuration, the flue gas may also preheat the incoming combustion air to some degree. - The illustrated
rearward end wall 26 is provided with threeknockouts 74 for forming the duct opening 66 in one of three different locations facing different directions. The first knockout was located on a side of therearward end wall 26 adjacent theinlet air chamber 64 and has been removed so that the attachedducts 52, 56 extend laterally from theenclosure assembly 14. Thesecond knockout 74 is located at a top of therear end wall 26 adjacent theinlet air chamber 64 so that theducts 52, 56 can alternatively extend upwardly from theenclosure assembly 14. Thethird knockout 74 is located at a rear side of therearward end wall 26 adjacent theinlet air chamber 64 so that theducts 52, 56 can extend longitudinally in a rearward direction from theenclosure assembly 14. Theknockouts 74 remain in place in theenclosure assembly 14 until installation when it is determined which direction theducts knockout 74 that provides the duct opening 66 facing the desired direction. Theducts 52, 56 are then installed to extend in the desired direction. Thus thesame water heater 10 can be utilized in a number of different locations and orientations withinrecreational vehicles 12. - The illustrated
control system 20 includes an ignition control orcontroller 76, anelectromechanical valve 78, apressure switch 80, athermostat 82, and an emergency cut-off switch 84. Theignition control 76 is provided with suitable electronics to control operation of theburner assembly 48, thevalve 78, and thefan 54 in the desired manner. Theignition control 76 operably connects the ignition components to vehicle power. The illustratedignition control 76 is operably connected to a 12 volt source but any other suitable type of source can alternatively be utilized. The illustratedburner igniter 58 is operably connected to a 110 volt source. The illustratedwater heater 10 includes a 110volt element 86 mounted to the front side of theforward end wall 24 but any other suitable power can alternatively be utilized. The illustratedelectromechanical valve 78 connects theburner assembly 48 with thegas inlet line 50 to selectively supply gas to theburner assembly 48. Theignition control 76 is operably connected to thefan 54, theburner igniter 58, and to thevalve 78. Thepressure switch 80 detects pressure within theinlet air chamber 64 and thecombustion chamber 32 to determine whether pressure within thecombustion chamber 32 is at a predetermined desired pressure. When thedraft inducing fan 54 creates the desired pressure within thecombustion chamber 32, theignition control 76 passes voltage to thevalve 78 to open thevalve 78 and pass gas to theburner assembly 48 and to arelay 88 which passes voltage to theburner igniter 58 to start combustion of the gas at theburner assembly 48. Theignition control 76 is regulated by thethermostat 82 and the emergency cut-off (ECO) switch 84 to obtain a desired temperature of the water within thewater tank 16. - To heat water, water is supplied to the
water tank 16 through theinlet 36. If anoperating switch 90 of theignition control 76 is closed, theignition control 76 determines if the water temperature is at a desired temperature via thethermostat 82. If it is determined that the water in thewater tank 16 needs to be heated, theigniter control 76 passes voltage to thedraft inducing fan 54. Operation of thefan 54 pulls ambient air from the environment at the exterior of therecreational vehicle 12 through the combustionair inlet duct 52 and into theinlet air chamber 64 where it passes through thefan 54 and into thecombustion chamber 32. When thepressure switch 80 senses that the pressure within thecombustion chamber 32 is at a desired level compared to ambient pressure, theigniter control 76 passes voltage to thevalve 78 to open thevalve 78 so that gas enters thegas inlet line 50 and passes to theburner assembly 48. Theigniter control 76 also passes voltage to therelay 88 which in turn passes voltage to theburner igniter 58. Theburner igniter 58 ignites the gas to create a combustion flame which burns the gas and the combustion air within thecombustion chamber 32. Thedraft inducing fan 54 forces the hot combustion gases out of thecombustion chamber 32 and into the flue gas outlet duct 56. The hot flue gas travels though the outlet duct 56 adjacent thewater tank 16 and heats thewater tank 16 which in turn convectively dissipates the heat to the water in the interior of thetank 16. The flue gas continues though the outlet duct 56 until it exits the outlet duct 56 to the ambient environment at the exterior of therecreational vehicle 12. Theigniter control 76 stops and starts theburner assembly 48 to generally maintain the water in thewater tank 16 at the desired temperature. Thefan 54 thus creates forced air flow through the closed heat exchanger system so that the flue gas can be directly vented to the environment as desired. Thus the system is not limited by the constraints of gravity flow. - It is apparent from the forgoing that the present invention provides an
improved water heater 10 that can be utilized in any position having access to an exterior wall such as a side wall, end wall, or ceiling wall and can be oriented either parallel or perpendicular to the exterior wall or the like. It is noted that thesame water heater 10 can be utilized in recreational vehicles requiring different orientations or positions and requires only a single outlet opening. - From the foregoing disclosure and detailed description of certain preferred embodiments, it is also apparent that various modifications, additions and other alternative embodiments are possible without departing from the true scope and spirit of the present invention. The embodiments discussed were chosen and described to provide the best illustration of the principles of the present invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated. All such modifications and variations are within the scope of the present invention as determined by the appended claims when interpreted in accordance with the benefit to which they are fairly, legally, and equitably entitled.
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/398,282 US20070237501A1 (en) | 2006-04-04 | 2006-04-04 | Water heater for recreational vehicles having forced air/direct vent combustion |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/398,282 US20070237501A1 (en) | 2006-04-04 | 2006-04-04 | Water heater for recreational vehicles having forced air/direct vent combustion |
Publications (1)
Publication Number | Publication Date |
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US20070237501A1 true US20070237501A1 (en) | 2007-10-11 |
Family
ID=38575396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/398,282 Abandoned US20070237501A1 (en) | 2006-04-04 | 2006-04-04 | Water heater for recreational vehicles having forced air/direct vent combustion |
Country Status (1)
Country | Link |
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US (1) | US20070237501A1 (en) |
Cited By (4)
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---|---|---|---|---|
US20090084330A1 (en) * | 2007-10-02 | 2009-04-02 | John Mark Kloster | Enclosure for marine water heaters |
US20090179079A1 (en) * | 2007-11-13 | 2009-07-16 | International Thermal Investments Ltd. | Coolant and potable water heater |
CN108019782A (en) * | 2018-01-08 | 2018-05-11 | 衡水富朗顺自动化设备有限公司 | A kind of biomass fuel warming stove |
WO2021185903A1 (en) * | 2020-03-17 | 2021-09-23 | Dometic Sweden Ab | Heating apparatus, recreational vehicle with heating apparatus and method for heating fluids in a recreational vehicle |
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