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US20070224558A1 - Gas flow and combustion control system - Google Patents

Gas flow and combustion control system Download PDF

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Publication number
US20070224558A1
US20070224558A1 US11682502 US68250207A US2007224558A1 US 20070224558 A1 US20070224558 A1 US 20070224558A1 US 11682502 US11682502 US 11682502 US 68250207 A US68250207 A US 68250207A US 2007224558 A1 US2007224558 A1 US 2007224558A1
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US
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Application
Patent type
Prior art keywords
gas
control
pilot
flame
module
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
Application number
US11682502
Inventor
Christopher Flick
Corbit Beasey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
American Flame Inc
Original Assignee
American Flame Inc
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Filing date
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/02Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
    • F23N5/123Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/002Regulating fuel supply using electronic means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/003Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F23N5/006Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2029/00Flame sensors
    • F23N2029/12Flame sensors with flame rectification current detecting means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N2035/00Valves, nozzles or pumps
    • F23N2035/12Fuel valves

Abstract

A system for controlling the flow and combustion of natural gas and/or liquid propane in a ventless fireplace. The system utilizes an ODS pilot in combination with a burner, an electronic control module, a gas control valve, an igniter, and a flame rectification sensor. When the pilot is lit, an ionized flame is provided and the current of the flame rectification sensor is rectified, providing a signal to the electronic control module to maintain the delivery of gas to the pilot and main burner via the gas control valve. When the oxygen level within the fireplace falls below a predetermined level, the flame at the pilot becomes unstable and this prevents the rectification of current at the flame rectification sensor, signaling the electronic control module to cease the flow of gas the burner and pilot via the gas control valve.

Description

    BACKGROUND OF THE INVENTION
  • [0001]
    1. Field of the Invention.
  • [0002]
    The present invention relates to a system for controlling the flow and combustion of natural gas and/or liquid propane in a fireplace or heater burner apparatus.
  • [0003]
    2. Description of the Related Art.
  • [0004]
    Fireplaces have been utilized by homeowners for decades to heat the interior of their home and/or to enhance the aesthetic beauty of their home. Numerous types of fireplaces exist. Natural wood burning fireplaces are common and require a chimney to vent the combustion byproducts, including carbon monoxide gas and particulate matter, outside of the living quarters of the home. Additionally, natural wood fireplaces require the homeowner to procure wood and physically place the wood within the fireplace for combustion. In contrast, natural gas and liquid propane fireplaces eliminate the need to procure wood. Additionally, these fireplaces recreate the appearance of a natural wood fire by combusting the gas at the surface of a burner. Moreover, due to the clean burning properties of natural gas and liquid propane, these fireplaces can be designed so that they are vented directly into the room, known as ventless fireplaces, increasing their efficiency and avoiding the need for a flue.
  • [0005]
    All fireplaces, regardless of the design utilized therein, consume oxygen during combustion. With natural gas and liquid propane ventless fireplaces, the combustion of the gas consumes oxygen which may cause the supply of oxygen within the home to be reduced and the levels of carbon monoxide and carbon dioxide gas to correspondingly increase. To prevent the levels of carbon monoxide and carbon dioxide gases within the home from reaching elevated levels, oxygen depletion sensors can be incorporated into the fireplace design.
  • [0006]
    During normal operation of a ventless gas fireplace, the gas is piped to a pilot, i.e. a small exit for gas within the fireplace, where it is ignited. The resulting pilot flame is then allowed to burn uninterrupted. To provide gas to the burner, a thermocouple is placed near the pilot flame and, once sufficiently heated, it produces an electrical current which keeps the pilot valve open and signals an electronic control module and/or a gas control valve to start the flow of gas to the burner. The pilot flame then ignites the gas as it exits the burner. As the fire burns within the fireplace, the oxygen depletion sensor monitors the level of oxygen therein. If the level of oxygen in the air falls below a preset threshold, the pilot will become unstable and flicker. The absence of a pilot flame in contact with the thermocouple causes the thermocouple to cool and, resultantly, the flow of electricity from the thermocouple to fall or cease. The decrease or cessation in electrical output is detected by the electronic control module or gas control valve which halts the flow of gas to both the main burner and the pilot light.
  • SUMMARY OF THE INVENTION
  • [0007]
    The present invention provides a system for controlling the flow and combustion of natural gas and/or liquid propane in a fireplace or heater burner apparatus. In one embodiment, the system utilizes an oxygen depletion sensor pilot in combination with a burner, an electronic control module, a gas control valve, an igniter, and a flame rectification sensor. The flame rectification sensor utilizes an ionized flame to rectify the electrical current sent through the sensor. When the pilot is lit, an ionized flame is provided and the current of the flame rectification sensor is rectified. The flame rectification sensor then provides the rectified current to the electronic control module to initiate the delivery of gas to the main burner via the gas control valve where it is ignited by the pilot flame. When the oxygen level within the fireplace falls below a predetermined level, the flame at the pilot becomes unstable. This prevents the rectification of current at the flame rectification sensor, signaling the electronic control module to cease the flow of gas to the burner and pilot via the gas control valve.
  • BRIEF DESCRIPTION OF THE DRAWING
  • [0008]
    The above-mentioned and other features and advantages of this invention, and the manner of attaining them, will become more apparent and the invention itself will be better understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawing, wherein:
  • [0009]
    FIG. 1 is schematic of the gas flow and combustion system of the present invention.
  • [0010]
    The exemplification set out herein illustrates one preferred embodiment of the invention, in one form, and such exemplification is not to be construed as limiting the scope of the invention any manner.
  • DETAILED DESCRIPTION OF THE INVENTION
  • [0011]
    FIG. 1 depicts gas flow and combustion control system 10. While system 10 is described herein with specific reference to a ventless gas fireplace, system 10 can be reconfigured and utilized in other applications. With reference to FIG. 1, system 10 includes electronic control module 12, gas control valve 14, burner 16, oxygen depletion sensor (“ODS”) pilot 18 having a ruby orifice (not shown), igniter 20, and flame rectification sensor 22.
  • [0012]
    To control the operation of system 10, electronic control module 12 sends and receives signals from the various components of system 10, as described below. An example of the electronic control module which may be utilized in the present system is the electronic control module available from American Flame, Fort Wayne, Ind., series number AF-4000 MOD. Electronic control module 12 can be powered by a battery, such as a six-volt battery (not shown), connected thereto or can be configured for connection to a source of A/C power. Electronic control module 12 sends an electrical signal to gas control valve 14 through wires 24, 26. Wire 24 is connected to gas control valve 14 and signals gas control valve 14 to start or stop the flow of gas to burner 16. Wire 26 is connected to gas control valve 14 and signals gas control valve 14 to start or stop the flow of gas to ODS pilot 18.
  • [0013]
    Additionally, electronic control module 12 also sends an electrical current to igniter 20 via wire 28. This current causes tip 30 of igniter 20 to emit a spark. The spark from igniter 20 will ignite ODS pilot 18 when gas is flowing therethrough. Furthermore, electronic control module 12 receives a signal from flame rectification sensor 22, as discussed below. Finally, electronic control module 12 receives electronic input from receiver 32 via wire 34. The input sent from receiver 32 instructs electronic control module 12 to perform a specified action, i.e. start or stop gas flow and/or ignite ODS pilot 18. Receiver 32 can be designed to receive input from an external infrared or radio signal remote control unit, as well as from other known controllers.
  • [0014]
    Gas control valve 14 is connected at inlet 36 to gas supply line 38, such as a natural gas grid or a liquid propane tank (not shown). An example of the gas control valve which may be utilized in the present system is a spark to pilot electronic valve available from American Flame, Fort Wayne, Ind., series number AF-4000. As described in detail below, when gas control valve 14 is in a position corresponding to an ON condition, gas flows to both burner 16 and ODS pilot 18 via outlets 40, 42 and pipes 44, 46 respectively. Similarly, when gas control valve 14 is in a position corresponding to an OFF condition, the flow of gas from supply line 38 to pipes 44, 46, and correspondingly burner 16 and ODS pilot 18, is prevented. Finally, when gas control valve 14 is in a position corresponding to a PILOT ON condition, the flow of gas from supply line 38 through pipe 46 and ODS pilot 18 is allowed, while the flow of gas through pipe 44 and, correspondingly, burner 16 is prevented.
  • [0015]
    To ignite burner 16, i.e. turn on the fireplace, a signal is sent to receiver 32 which transmits an electrical input to electronic control module 12 instructing electronic control module 12 to ignite burner 16. Electronic control module 12 then sends a signal to gas control valve 14 via wire 26. In response, gas control valve 14 is oriented in a PILOT ON position and gas flows from gas supply line 38 through gas control valve 14 and pipe 46 to ODS pilot 18, mounted on L-shaped bracket 48. Substantially immediately thereafter, electronic control module 12 provides electric current to igniter 20, which is mounted on L-shaped bracket 48 at a right angle to ODS pilot 18, via wire 28. The current creates a spark at tip 30 of igniter 20, as described above, sufficient to ignite the gas escaping from end 50 of ODS pilot 18.
  • [0016]
    ODS pilot 18 will stay lit due to the continual flow of gas from gas supply line 38, as described above. Flame rectification sensor 22, which is commercially available from Johnson Controls or White-Rodgers, for example, is positioned near ODS pilot 18 on L-shaped bracket 48 so that the electrode 54 of flame rectification sensor 22 is at least partially within the flame of ODS pilot 18 when ODS pilot 18 is ignited. A current is sent to electrode 54 and, when the electrode is within an ionized flame, the current is rectified. In response to the rectified signal from flame rectification sensor 22, electronic control module 12 sends a signal to gas control valve 14 via wire 24. This signal positions gas control valve 14 in an ON condition and allows for the flow of gas from gas supply line 38 via gas control valve 14 and pipes 44, 46 to both burner 16 and ODS pilot 18, respectively. As gas escapes apertures 56 of burner 16, it is ignited by the flame at previously ignited ODS pilot 18.
  • [0017]
    To stop the flow of gas to burner 16 and ODS pilot 18, i.e., turn off the fireplace, a signal is sent to receiver 32 which transmits an electrical input to electronic control module 12 via wire 34 instructing electronic control module 12 to extinguish burner 16 and ODS pilot 18. In response, electronic control module 12 sends a signal to gas control valve 14 via wires 24, 26. The gas control valve 14 is now positioned in an OFF condition and the flow of gas from gas supply line 38 to both pipes 44, 46, and correspondingly burner 16 and ODS pilot 18, respectively, is prevented. With no additional supply of gas, the flames at ODS pilot 18 and burner 16 are extinguished.
  • [0018]
    Additionally, system 10 will automatically stop the flow of gas to ODS pilot 18 and burner 16 if the level of oxygen in the air drops below a predetermined level. As the oxygen in the air around ODS pilot 18 falls, the flame generated at ODS pilot 18 will become unstable and flicker and, if the oxygen is sufficiently depleted, this will be sensed by the flame rectification sensor and the current is no longer rectified. The absence of a rectified signal is detected by electronic control module 12 and electronic control module 12 sends a signal to gas control valve 14 via wires 24, 26. This signal causes gas control valve 14 to be placed in an OFF condition, preventing the flow of gas to burner 16 and ODS pilot 18. Once the level of oxygen has increased above the cutoff level of ODS pilot 18, system 10 can be reactivated and burner 16 can be ignited as described above.
  • [0019]
    While this invention has been described as having a preferred design, the present invention can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims.

Claims (6)

  1. 1. A gas and combustion control system for a ventless gas fireplace, comprising:
    an electronic spark to pilot control module;
    a gas control valve connected to and controlled by said control module;
    a main gas burner and an oxygen depletion sensor (ODS) pilot fluidly connected to said control valve;
    an electronic igniter disposed in proximity to said pilot and connected to said control module; and
    a flame rectification sensor disposed in proximity to said pilot to sense a flame produced by said pilot, said flame rectification sensor connected to said control module.
  2. 2. The system of claim 1 including a bracket connected to said pilot and supporting said igniter and said flame rectification sensor.
  3. 3. The system of claim 1 wherein said igniter and said flame rectification sensor are adjacent each other and at an outlet end of said pilot.
  4. 4. The system of claim 3 including a bracket connected to said pilot and supporting said igniter and said flame rectification sensor.
  5. 5. The system of claim 1 wherein said control module includes a wireless receiver such that said control module can be wirelessly controlled.
  6. 6. A ventless fireplace, comprising:
    an electronic spark to pilot control module;
    a gas control valve connected to and controlled by said control module;
    a main gas burner and an oxygen depletion sensor (ODS) pilot fluidly connected to said control valve;
    an electronic igniter disposed in proximity to said pilot and connected to said control module; and
    a flame rectification sensor disposed in proximity to said pilot to sense a flame produced by said pilot, said flame rectification sensor connected to said control module.
US11682502 2006-03-08 2007-03-06 Gas flow and combustion control system Abandoned US20070224558A1 (en)

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US78042006 true 2006-03-08 2006-03-08
US11682502 US20070224558A1 (en) 2006-03-08 2007-03-06 Gas flow and combustion control system

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US11682502 US20070224558A1 (en) 2006-03-08 2007-03-06 Gas flow and combustion control system

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060068349A1 (en) * 2003-02-13 2006-03-30 Barbara Happe Method and arrangement for igniting a gas flow
US20090280448A1 (en) * 2008-05-12 2009-11-12 Coprecitec, S.L. Multiple gas pilot burner
US20100026128A1 (en) * 2008-07-30 2010-02-04 A. O. Smith Corporation Interior permanent magnet motor including rotor with unequal poles
US7766006B1 (en) 2007-03-09 2010-08-03 Coprecitec, S.L. Dual fuel vent free gas heater
US8057219B1 (en) 2007-03-09 2011-11-15 Coprecitec, S.L. Dual fuel vent free gas heater
US8118590B1 (en) 2007-03-09 2012-02-21 Coprecitec, S.L. Dual fuel vent free gas heater
US8403661B2 (en) 2007-03-09 2013-03-26 Coprecitec, S.L. Dual fuel heater
US20130149652A1 (en) * 2006-12-22 2013-06-13 Continental Appliances, Inc. D.B.A. Procom Pilot assemblies for heating devices
US20140158111A1 (en) * 2011-07-29 2014-06-12 Ningbo Richen Electrical Appliance Co., Ltd Fireplace of Combusting Gasified Liquid Fuel
US8899971B2 (en) 2010-08-20 2014-12-02 Coprecitec, S.L. Dual fuel gas heater
US9546788B2 (en) * 2012-06-07 2017-01-17 Chentronics, Llc Combined high energy igniter and flame detector
US9829195B2 (en) 2009-12-14 2017-11-28 David Deng Dual fuel heating source with nozzle

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US2379873A (en) * 1943-01-09 1945-07-10 Honeywell Regulator Co Electronic control device
US2379872A (en) * 1943-01-09 1945-07-10 Honeywell Regulator Co Electronic control apparatus
US2626657A (en) * 1949-06-27 1953-01-27 Honeywell Regulator Co Burner control apparatus with component checking means
US2640920A (en) * 1949-07-09 1953-06-02 Gen Controls Co Safety fuel burner control system utilizing flame conduction
US2648375A (en) * 1949-12-27 1953-08-11 Honeywell Regulator Co Electronic burner control apparatus
US2684115A (en) * 1949-07-09 1954-07-20 Gen Controls Co Fuel burner safety control using flame conduction
US3173472A (en) * 1962-12-07 1965-03-16 Honeywell Inc Pilot burner-thermocouple combination
US3405998A (en) * 1967-06-26 1968-10-15 Fenwal Inc Ignition and flame monitoring control apparatus for fuel burners
US3615872A (en) * 1969-05-09 1971-10-26 Robertshaw Controls Co Supporting and retaining means for temperature sensing means
US3986813A (en) * 1975-03-31 1976-10-19 Cam-Stat Incorporated Intermittent pilot igniter and valve controller for gas burner
US4082493A (en) * 1977-01-19 1978-04-04 Cam-Stat Incorporated Gas burner control system
US4177034A (en) * 1977-12-29 1979-12-04 Robertshaw Controls Company Retrofit igniter
US4194875A (en) * 1978-01-17 1980-03-25 Cam-Stat Incorporated Intermittent pilot ignition system
US4207053A (en) * 1978-08-18 1980-06-10 Essex Group, Inc. Igniter and flame sensor assembly for gas burning appliance
US4516930A (en) * 1982-09-30 1985-05-14 Johnson Service Company Apparatus and method for controlling a main fuel valve in a standing pilot burner system
US4793799A (en) * 1983-07-25 1988-12-27 Quantum Group, Inc. Photovoltaic control system
US4962750A (en) * 1989-11-06 1990-10-16 R. H. Peterson Company Remote control of gas fireplace burner
US5397233A (en) * 1993-08-10 1995-03-14 Appalachian Stove & Fabricators, Inc. Assembly for controlling the flow of gas for gas fired artificial logs
US5450841A (en) * 1993-05-18 1995-09-19 Gmi Holding, Inc. Multi-function remote control system for gas fireplace
US5538416A (en) * 1995-02-27 1996-07-23 Honeywell Inc. Gas burner controller with main valve delay after pilot flame lightoff
US5906197A (en) * 1996-11-18 1999-05-25 Superior Fireplace Company Gas fireplace
US6413079B1 (en) * 2000-04-10 2002-07-02 Heat-N-Glo Fireplace Products, Inc. Voice activated fireplace control system
US20020160326A1 (en) * 2001-04-26 2002-10-31 David Deng Gas pilot system and method having improved oxygen level detection capability and gas fueled device including the same
US20020160325A1 (en) * 2001-04-26 2002-10-31 David Deng Gas pilot system and method having improved oxygen level detection capability and gas fueled device including the same
US20040226600A1 (en) * 2001-04-18 2004-11-18 Edward Starer Gas control assembly for controlling the supply of gas to unvented gas appliances

Patent Citations (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2379873A (en) * 1943-01-09 1945-07-10 Honeywell Regulator Co Electronic control device
US2379872A (en) * 1943-01-09 1945-07-10 Honeywell Regulator Co Electronic control apparatus
US2626657A (en) * 1949-06-27 1953-01-27 Honeywell Regulator Co Burner control apparatus with component checking means
US2640920A (en) * 1949-07-09 1953-06-02 Gen Controls Co Safety fuel burner control system utilizing flame conduction
US2684115A (en) * 1949-07-09 1954-07-20 Gen Controls Co Fuel burner safety control using flame conduction
US2648375A (en) * 1949-12-27 1953-08-11 Honeywell Regulator Co Electronic burner control apparatus
US3173472A (en) * 1962-12-07 1965-03-16 Honeywell Inc Pilot burner-thermocouple combination
US3405998A (en) * 1967-06-26 1968-10-15 Fenwal Inc Ignition and flame monitoring control apparatus for fuel burners
US3615872A (en) * 1969-05-09 1971-10-26 Robertshaw Controls Co Supporting and retaining means for temperature sensing means
US3986813A (en) * 1975-03-31 1976-10-19 Cam-Stat Incorporated Intermittent pilot igniter and valve controller for gas burner
US4082493A (en) * 1977-01-19 1978-04-04 Cam-Stat Incorporated Gas burner control system
US4177034A (en) * 1977-12-29 1979-12-04 Robertshaw Controls Company Retrofit igniter
US4194875A (en) * 1978-01-17 1980-03-25 Cam-Stat Incorporated Intermittent pilot ignition system
US4207053A (en) * 1978-08-18 1980-06-10 Essex Group, Inc. Igniter and flame sensor assembly for gas burning appliance
US4516930A (en) * 1982-09-30 1985-05-14 Johnson Service Company Apparatus and method for controlling a main fuel valve in a standing pilot burner system
US4793799A (en) * 1983-07-25 1988-12-27 Quantum Group, Inc. Photovoltaic control system
US4962750A (en) * 1989-11-06 1990-10-16 R. H. Peterson Company Remote control of gas fireplace burner
US5450841A (en) * 1993-05-18 1995-09-19 Gmi Holding, Inc. Multi-function remote control system for gas fireplace
US5397233A (en) * 1993-08-10 1995-03-14 Appalachian Stove & Fabricators, Inc. Assembly for controlling the flow of gas for gas fired artificial logs
US5538416A (en) * 1995-02-27 1996-07-23 Honeywell Inc. Gas burner controller with main valve delay after pilot flame lightoff
US5906197A (en) * 1996-11-18 1999-05-25 Superior Fireplace Company Gas fireplace
US6413079B1 (en) * 2000-04-10 2002-07-02 Heat-N-Glo Fireplace Products, Inc. Voice activated fireplace control system
US20040226600A1 (en) * 2001-04-18 2004-11-18 Edward Starer Gas control assembly for controlling the supply of gas to unvented gas appliances
US20020160326A1 (en) * 2001-04-26 2002-10-31 David Deng Gas pilot system and method having improved oxygen level detection capability and gas fueled device including the same
US20020160325A1 (en) * 2001-04-26 2002-10-31 David Deng Gas pilot system and method having improved oxygen level detection capability and gas fueled device including the same

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060068349A1 (en) * 2003-02-13 2006-03-30 Barbara Happe Method and arrangement for igniting a gas flow
US8668490B2 (en) * 2003-02-13 2014-03-11 Mertik Maxitrol Gmbh & Co. Kg Method and arrangement for igniting a gas flow
US8764436B2 (en) * 2006-12-22 2014-07-01 Procom Heating, Inc. Valve assemblies for heating devices
US20130149652A1 (en) * 2006-12-22 2013-06-13 Continental Appliances, Inc. D.B.A. Procom Pilot assemblies for heating devices
USRE46308E1 (en) 2007-03-09 2017-02-14 Coprecitec, S.L. Dual fuel heater
US8061347B2 (en) 2007-03-09 2011-11-22 Coprecitec, S.L. Dual fuel vent free gas heater
US8118590B1 (en) 2007-03-09 2012-02-21 Coprecitec, S.L. Dual fuel vent free gas heater
US8777609B2 (en) 2007-03-09 2014-07-15 Coprecitec, S.L. Dual fuel heater
US8403661B2 (en) 2007-03-09 2013-03-26 Coprecitec, S.L. Dual fuel heater
US7766006B1 (en) 2007-03-09 2010-08-03 Coprecitec, S.L. Dual fuel vent free gas heater
US8057219B1 (en) 2007-03-09 2011-11-15 Coprecitec, S.L. Dual fuel vent free gas heater
US20090280448A1 (en) * 2008-05-12 2009-11-12 Coprecitec, S.L. Multiple gas pilot burner
US8137098B2 (en) 2008-05-12 2012-03-20 Coprecitec, S.L. Multiple gas pilot burner
US20100026128A1 (en) * 2008-07-30 2010-02-04 A. O. Smith Corporation Interior permanent magnet motor including rotor with unequal poles
US9829195B2 (en) 2009-12-14 2017-11-28 David Deng Dual fuel heating source with nozzle
US8899971B2 (en) 2010-08-20 2014-12-02 Coprecitec, S.L. Dual fuel gas heater
US9388989B2 (en) * 2011-07-29 2016-07-12 Ningbo Richen Electrical Appliance Co., Ltd Fireplace of combusting gasified liquid fuel
US20140158111A1 (en) * 2011-07-29 2014-06-12 Ningbo Richen Electrical Appliance Co., Ltd Fireplace of Combusting Gasified Liquid Fuel
US9546788B2 (en) * 2012-06-07 2017-01-17 Chentronics, Llc Combined high energy igniter and flame detector

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AS Assignment

Owner name: AMERICAN FLAME, INC., INDIANA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FLICK, CHRISTOPHER L.;BEASEY, CORBIT;REEL/FRAME:019314/0492;SIGNING DATES FROM 20070413 TO 20070417