EP0727613B1 - Procédé et dispositif de commande pour un appareil de chauffage à fluide inflammable - Google Patents

Procédé et dispositif de commande pour un appareil de chauffage à fluide inflammable Download PDF

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Publication number
EP0727613B1
EP0727613B1 EP96301115A EP96301115A EP0727613B1 EP 0727613 B1 EP0727613 B1 EP 0727613B1 EP 96301115 A EP96301115 A EP 96301115A EP 96301115 A EP96301115 A EP 96301115A EP 0727613 B1 EP0727613 B1 EP 0727613B1
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EP
European Patent Office
Prior art keywords
burner
output
control
sensor
fuel
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.)
Expired - Lifetime
Application number
EP96301115A
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German (de)
English (en)
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EP0727613A1 (fr
Inventor
John Stuart Fleming
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.)
Superior Fireplace Co
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Superior Fireplace Co
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Publication date
Application filed by Superior Fireplace Co filed Critical Superior Fireplace Co
Publication of EP0727613A1 publication Critical patent/EP0727613A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/102—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/22—Pilot burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/22—Pilot burners
    • F23N2227/24—Pilot burners the pilot burner not burning continuously
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/04—Fail safe for electrical power failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements

Definitions

  • This invention relates to methods and apparatus for the control of flammable fluid fuelled heaters and, in particular, although not necessary solely, to natural gas fuelled heaters.
  • Heaters of this type are often required to provide some form of sensor to sense the levels of carbon dioxide within the room in which the heater is housed and close the unit down should these levels exceed a permitted level.
  • Such units are often provided in the form of a pilot burner which may or may not be used as part of the ignition system for the main burner in the heater.
  • European Patent Specification No 0 100 758 discloses a safety device for heating gas apparatus which is responsive to a reduction in the oxygen content in the environment in which the apparatus is located, to close a main solenoid valve controlling the gas supply.
  • a temperature sensor responds when the pilot flame changes position.
  • Japanese Patent Publication Nos 55046328 and 7035341 and German Patent Specification No 4313575 operate in a similar manner.
  • thermocouple or thermopile adjacent the pilot burner to hold a main gas valve open which is interconnected with the thermocouple or thermopile. Therefore, as the degree of carbon dioxide in the atmosphere increases, the flame characteristic from the pilot burner changes and will reduce the energy supplied to the thermocouple or thermopile and consequently shut off the main burner by closing the main gas valve.
  • Oxygen depletion pilot burners of this type require a great deal of precision in their fitment and adjustment.
  • the temperature of the flame of the pilot burner may also be dependent upon the temperature of the pilot burner and, consequently, its proximity to the main burner as well as the physical orientation of the pilot burner and/or the manufacturing tolerances of the pilot burner assembly.
  • This pilot burning acting directly on a thermocouple driven valve, variations in such valve types lead to a variation in the output from the thermocouple, which will determine valve closure.
  • the actual oxygen depletion of the room in which the heater is housed may be represented in varying manners in the output from the thermocouple sensor according to placement of the pilot burner and associated sensor.
  • such systems are highly dependent on the actual appliance to which it is fitted and it is often necessary to use specialised manufacturers of such systems to tune the oxygen depletion burners to suit particular appliances.
  • the current oxygen depletion systems also only measure the presence of carbon dioxide as a contaminant to control the main gas circuit. There is no independent assessment of the carbon monoxide level with carbon monoxide being the far more hazardous contaminant. Indeed, the oxygen depletion systems rely on an assumed relationship between the carbon dioxide levels and the carbon monoxide levels to keep the carbon monoxide levels in check. Such a relationship may be valid for particular appliances when new and change as the appliance suffers wear and tear. For example, a gas heater of this type with a break in the casing of the main burner or some other similar failure will greatly increase the carbon monoxide levels out of proportion of the traditional carbon monoxide relationship.
  • a further problem with current pilot burners is the gas consumption by the pilot burners when the heater is not in operation. This had lead to some territories to ban standing pilots or to provide such pilots with an inferior rating for energy consumption compared with equivalent heaters run by electronic ignition. Electronic ignition for such heaters is a relatively expensive solution compared with the cost of pilot burners.
  • apparatus for the control of flammable fluid fuelled heaters comprising: a primary fuel burner; a pilot fuel burner; a temperature sensor adjacent said pilot burner such that the output of said sensor will vary upon changes in the output of said pilot fuel burner, and hence upon changes in the oxygen content of the atmosphere in which the pilot fuel burner is located, and control means to close off the fuel supply to the primary fuel burner upon the output of the temperature sensor falling below a predetermined level; characterised in that the control means includes means which enables said predetermined level to be settable for any location so that the control means may be caused to close off said fuel supply upon said oxygen content falling below a particular level.
  • a method for the control of flammable fluid fuelled heaters comprising: supplying fuel to a primary burner for heating; providing a pilot burner; sensing the output of the pilot burner, which output is dependent upon the oxygen content of the atmosphere in which the pilot fuel burner is located, and controlling the fuel supply to the primary burner so as to close off supply of fuel to said primary burner if the output from said sensor falls below a predetermined level; characterised in that said predetermined level is settable for any location, so that the supply of fuel to said primary burner may be closed off upon said oxygen content falling below a particular level.
  • the invention relates to a method and apparatus for the control of flammable fluid fuelled heaters such as natural gas heaters.
  • the invention may be provided in flueless heaters or heaters in which at least a portion of the exhaust is directed into the room in which the heater is housed.
  • thermocouple sensor 2 or other suitable form of temperature sensor which is placed adjacent a pilot burner (not shown).
  • This thermocouple sensor receives energy from the pilot burner and the output from the sensor will be sensitive to the output from the pilot burner which itself is sensitive to the levels of carbon monoxide in the atmosphere. Therefore, the use of a thermocouple sensor 2 such as that shown in a control circuit can allow the thermocouple voltage from the sensor to be compared with a factory set value for that type of unit which should accurately reflect the oxygen depletion of the atmosphere. This control circuit can then close the main gas valve to the burner assembly when the oxygen level and resultant thermocouple voltage falls below this settable value.
  • control circuit will be supplied with a power supply which, in this preferred embodiment, may comprise a 9-14 volt AC supply or an alternative 6 volt DC supply.
  • a power supply which, in this preferred embodiment, may comprise a 9-14 volt AC supply or an alternative 6 volt DC supply.
  • the alternative supplies allow the unit to run off mains power through a suitable transformer or, alternatively, battery powered when necessary.
  • the power supply 3 shown in Figure 1 receives the input current through inputs 4 or 5 and supplies a primary supply 6 to a supply sensor 7.
  • This optional supply sensor 7 allows the control circuit to determine when the power supply voltage has dropped to a level at which the control circuitry is no longer reliable.
  • the supply sensor may be connected to an interrupter 8 to shut the unit off and close the main valve (not shown) to ensure no further emission of gas.
  • thermocouple sensor 2 may itself have a built in delay controlled by some form of timing circuit to ensure that the thermocouple does not control the gas flow through the unit until the thermocouple has had sufficient time to reach an operating temperature. Although the particular value for this delay may be any suitable time limit, a delay in the region of 60 seconds may be sufficient. This start up procedure not only allows the thermocouple sensor and its associated voltage to account for the warming of the sensor itself but also for the voltage drop associated with the sensor and associated circuitry switching from an unloaded to a loaded condition leading to a temporary voltage drop.
  • thermocouple sensor to reach a threshold voltage beyond which any falling off in that voltage below the threshold will close off the main supply to the primary burner. If the thermocouple sensor fails to reach the threshold value for voltage despite the delay, again the main gas valve will be turned off.
  • the heating apparatus may also include circuitry for the monitoring of carbon monoxide.
  • This may comprise a carbon monoxide sensor 9 included in the circuitry and controlled by a timing circuit 10.
  • An important aspect of this carbon monoxide sensor is that it is only in operation when the appliance itself is switched on. This may be through the use of a controlled supply 11 controlled by actual operation of the appliance and ensures that the carbon monoxide sensor does not draw power other than when needed. This reduces the normally high power requirements of such carbon monoxide sensors.
  • dual carbon monoxide sensors are used. These allow each of the sensors to independently measure the carbon monoxide level and check it against a suitable safety level such as 50ppm.
  • the unit may be shut down through triggering the interrupter 8.
  • the use of dual carbon monoxide sensors may allow the unit to be shut down should there be a difference between the carbon monoxide sensors of greater than, for example, 20ppm. This acts as a check on the carbon monoxide sensors accuracy.
  • a single sensor may be used.
  • Typical carbon monoxide sensors rely on heaters 12 which are preferably controlled by a heater control 13.
  • the heaters operate intermittently for a set period and heat the sensor immediately after which the resistances of the sensors are sampled and the carbon monoxide value can be determined.
  • the timing circuit 10 sets, in this preferred example, a period of 4 minutes between the heaters going into operation.
  • the timing circuit controls the heaters and switches these on for a period of 1 minute after which the sampling and carbon monoxide values are determined.
  • Typical carbon monoxide sensors may be heated by heaters drawing, for example, 30ma for the 1 minute period.
  • this preferred embodiment also provides battery voltage to the carbon monoxide sensor heaters 12 for a period of 1 minute at repeat intervals of 64 minutes. This acts as a cleaning step to clean the sensors once every 64 minutes.
  • the times mentioned in this preferred embodiment could be changed to any other suitable time period.
  • a cleaning cycle in which the battery voltage is supplied to the carbon monoxide sensor heaters is triggered immediately upon start up of the appliance. This start up of the appliance may be triggered by an suitable means including use of the thermocouple sensor. This heat cleaning cycle may occur during the first four minute cycle after starting the appliance.
  • this preferred form of the invention tests for the heater cleaning voltage prior to initiating the normal heating cycle which forms part of the sensing step.
  • a manual operation of the sensors may be included if desired.
  • an appliance temperature sensor 14 is included other than the thermocouple sensor 2.
  • This appliance temperature sensor may be included and the output sampled at regular intervals of, for example, every 64 minutes. If the temperature sensor indicates a temperature of, for example, less than a threshold of 40°C, this would indicate that the appliance is not in use and the appliance may be turned off.
  • This preferably includes the switching off of the pilot burner (not shown) which operates adjacent the thermocouple sensor. This overcomes problems of standing pilot burners and their energy consumption by switching the pilot burner off once the appliance senses that it is no longer in operation.
  • this sensor may be field selectable so that it may be changed for different operating conditions.
  • this sensing of the appliance temperature is preferably only performed at relatively large intervals such as the 64 minutes previously mentioned. This allows the unit if thermostatically controlled to shut down when dictated by the thermostat and leave the pilot burner in operation for re-ignition of the gas flow once the thermostat suggests the heater is again required.
  • the relatively large periods between sampling of this appliance temperature sensor 14 and the relatively low threshold value of 40°C should ensure that the pilot burner is extinguished only when the unit is genuinely not in operation rather than between heating periods dictated by the thermostat.
  • the circuit may control an alarm circuit 15.
  • This alarm circuit may control the operation of an audible alarm such as a buzzer or a visual alarm such as warning lights or both to ensure that a suitable alarm is signalled upon any of the failures mentioned previously. This may be particularly important in the case of the carbon monoxide sensor due to the toxicity of carbon monoxide and the associated health risks.
  • thermocouple sensor may be placed in a controlled environment and the carbon dioxide or oxygen depletion levels monitored during operation of the appliance.
  • the output from the thermocouple sensor can be mapped against these separately measured values and a suitable threshold voltage selected to correspond with a particular carbon dioxide or oxygen depletion level.
  • thermocouple sensor To avoid jittering and other very minor variations in the voltage output from the thermocouple sensor, a lmv hyterisis may be included to account for these.
  • the invention provides a control circuit which allows for monitoring of the carbon monoxide or oxygen depletion levels and allows for an easy method of determining the threshold voltages at which the unit should be shut down through a simple experiment in the factory. Once suitable levels have been determined, the correct relative position of the thermocouple sensor with the pilot burner should always provide equivalent results. This allows the manufacturer of the heater to control the thermocouple output at which the gas valve is shut off independent of the position or type of the gas valve. No longer is the position of the pilot burner or threshold value for the thermocouple determined by the valve characteristics.
  • thermocouple sensor or other features of the appliance may be used to control the operation of a carbon monoxide sensor provided as a separate unit.
  • This carbon monoxide sensor allows for separate sensing and control of the unit as a result of carbon monoxide levels and saves the carbon monoxide sensor drawing power through the use of the heaters associated with such sensing when the appliance is not in operation.
  • a further appliance temperature sensor may be used to control all the above circuitry and ensure that the appliance is not drawing power and the pilot burner is not in operation when the appliance itself is switched off.
  • Additional features such as remote operation of the heater, automatic shut off after a selectable period of time and similar functions may be included in the control system.
  • the use of mains voltage components may require the enclosure of the control system to decrease exposure of any gas to sparks.
  • Such an outer housing would require construction to withstand heater temperatures. Plus fittings may be provided to external sensors and components.
  • thermocouple unit which has predetermined characteristics for the threshold voltage from the thermocouple which will force closure of the valve.
  • the output voltage from the thermocouple which provides for valve closure may be, for example, 3mV.
  • thermocouple in that particular position related to the pilot burner and their comparative positions on the appliance which corresponds to the correct oxygen depletion level, whatever value that output is for the thermocouple may be set into the control circuitry to be the threshold value for that particular type of appliance. Subsequent substantially identical appliances with identical pilot burners, thermocouples and comparative positions of each should allow the accuracy to be maintained. Therefore, if the pilot burner and thermocouple are positioned well away from the main burner and near the front edge of the appliance and it is determined that a 9mV voltage from the thermocouple occurs at the lowest desirable oxygen levels, this may be set into the control means as the threshold value for all subsequent appliances manufactured to the same standards.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Resistance Heating (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Control Of Combustion (AREA)

Claims (10)

  1. Appareil pour la commande d'appareils de chauffage alimentés en fluide inflammable comprenant :
    un brûleur de carburant principal ;
    un brûleur de carburant pilote ;
    un capteur de température (2) disposé au voisinage dudit brûleur pilote de sorte que les données de sortie dudit capteur (2) varient en fonction des changements de la sortie dudit brûleur de carburant pilote, et donc en fonction des changements de la teneur en oxygène de l'atmosphère dans laquelle le brûleur de carburant pilote est situé, et un moyen de commande (8) pour fermer l'alimentation en carburant du brûleur de carburant principal si les données fournies par le capteur de température (2) tombent en-dessous d'un niveau prédéterminé ;
       caractérisé en ce que le moyen de commande (8) comprend un moyen permettant audit niveau prédéterminé d'être établi pour tout emplacement de sorte que le moyen de commande (8) puisse être amené à fermer ladite alimentation en carburant si ladite teneur en oxygène est inférieure à un certain niveau.
  2. Appareil pour la commande d'appareils de chauffage alimentés en fluide inflammable selon la revendication 1, dans lequel ledit moyen de commande (8) comprend un moyen de mémorisation pour mémoriser une valeur représentative dudit niveau prédéterminé ; un moyen de traitement pour comparer les données fournies par ledit capteur de température (2) avec ladite valeur mémorisée, et un moyen de sortie pour délivrer en sortie un signal et fermer l'alimentation en carburant du brûleur de carburant principal si les données de sortie dudit capteur de température tombent en-dessous dudit niveau prédéterminé.
  3. Appareil pour la commande d'appareils de chauffage alimentés en fluide inflammable selon la revendication 1 ou la revendication 2, dans lequel ledit moyen de commande (8) comprend un circuit de cadencement (10) pour placer un retard entre l'allumage de l'appareil de chauffage (12) et le début de la commande de l'alimentation en carburant du brûleur de carburant principal, en fonction des données fournies par le capteur de température (2).
  4. Appareil pour la commande d'appareils de chauffage alimentés en fluide inflammable selon l'une quelconque des revendications précédentes, dans lequel un deuxième capteur de température (14) est prévu pour comparer la température de l'appareil à une température prédéterminée, et un moyen de commande pour éteindre ledit brûleur pilote lorsque la température de l'appareil est inférieure à ladite valeur prédéterminée indiquant que l'appareil de chauffage n'est pas en fonctionnement.
  5. Appareil selon l'une quelconque des revendications 1 à 4, comprenant :
    un brûleur de carburant principal destiné à brûler le fluide inflammable ;
    un capteur de monoxyde de carbone (9) prévu pour éteindre ledit appareil de chauffage si le niveau de monoxyde de carbone dépasse un niveau prédéterminé ; et
    un moyen de commande pour faire fonctionner ledit capteur de monoxyde de carbone (9) seulement lorsque ledit appareil de chauffage est en fonctionnement.
  6. Appareil selon la revendication 5, dans lequel ledit moyen de commande comprend une alimentation commandée pour ledit capteur, d'où il résulte que la puissance n'est délivrée audit capteur que lorsque ledit dispositif de chauffage est en fonctionnement.
  7. Procédé pour la commande d'appareils de chauffage alimentés en fluide inflammable, comprenant les étapes consistant à :
    délivrer le carburant à un brûleur principal pour le chauffage ;
    prévoir un brûleur pilote ;
    détecter la sortie du brûleur pilote, laquelle sortie dépend de la teneur en oxygène de l'atmosphère dans laquelle le brûleur de carburant pilote est situé, et commander l'alimentation en carburant du brûleur principal de façon à fermer l'alimentation du carburant vers ledit brûleur principal si les données fournies par ledit capteur (2) tombent en-dessous d'un niveau prédéterminé ;
       caractérisé en ce que ledit niveau prédéterminé peut être établi pour tout emplacement, de sorte que l'alimentation du carburant vers le brûleur principal peut être fermée lorsque ladite teneur en oxygène est inférieure à un certain niveau.
  8. Procédé pour la commande d'appareils de chauffage alimentés en fluide inflammable selon la revendication 7, dans lequel ladite étape consistant à commander l'alimentation en carburant vers le brûleur principal comprend l'étape consistant à comparer les données de sortie du brûleur pilote avec un capteur de température (2), et l'étape consistant à comparer la sortie dudit capteur de température (2) avec une valeur mémorisée et, si la sortie du brûleur pilote chute en-dessous de la valeur mémorisée pour le capteur de température (2), délivrer en sortie un signal pour commander une soupape dans l'alimentation en carburant du brûleur principal.
  9. Procédé pour la commande d'appareils de chauffage alimentés en fluide inflammable selon la revendication 8, dans lequel ledit procédé comprend de plus une étape consistant à retarder la comparaison entre la sortie du capteur de température (2) et le niveau prédéterminé pendant un délai prédéterminé après l'allumage de l'appareil.
  10. Procédé pour la commande d'appareils de chauffage alimentés en fluide inflammable, utilisant l'appareil selon l'une quelconque des revendications 1 à 6.
EP96301115A 1995-02-20 1996-02-20 Procédé et dispositif de commande pour un appareil de chauffage à fluide inflammable Expired - Lifetime EP0727613B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ270528A NZ270528A (en) 1995-02-20 1995-02-20 Control of liquid fuelled heater: temperature sensor senses output of pilot burner and controls fuel supply to primary burner
NZ27052895 1995-02-20

Publications (2)

Publication Number Publication Date
EP0727613A1 EP0727613A1 (fr) 1996-08-21
EP0727613B1 true EP0727613B1 (fr) 2001-06-20

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EP96301115A Expired - Lifetime EP0727613B1 (fr) 1995-02-20 1996-02-20 Procédé et dispositif de commande pour un appareil de chauffage à fluide inflammable

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Country Link
EP (1) EP0727613B1 (fr)
AT (1) ATE202411T1 (fr)
AU (1) AU711388B2 (fr)
DE (1) DE69613413T2 (fr)
NZ (1) NZ270528A (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6139311A (en) 1998-01-20 2000-10-31 Gas Research Institute Pilot burner apparatus and method for operating
US6074200A (en) * 1998-01-20 2000-06-13 Gas Research Institute Burner apparatus having an air dam and mixer tube
GB2371356A (en) * 2000-12-14 2002-07-24 Ouzledale Foundry Comp Ltd Fuel burner safety system

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5546328A (en) * 1978-09-25 1980-04-01 Matsushita Electric Ind Co Ltd Cmbustion safety system
ES8405127A1 (es) * 1982-08-03 1984-06-01 Stefani & C G Pernumia Perfeccionamientos en los dispositivos de seguridad para aparatos de calentamiento por gas
JPS60194228A (ja) * 1984-03-15 1985-10-02 Rinnai Corp 熱電対式ガス安全器
JPS60235914A (ja) * 1984-05-08 1985-11-22 Tokyo Gas Co Ltd 燃焼器の安全装置
JPH01318809A (ja) * 1988-06-17 1989-12-25 Matsushita Electric Ind Co Ltd 火力切換装置
GB2249382B (en) * 1990-10-30 1995-07-12 Turnright Controls Flame responsive gas burner ignition
US5179933A (en) * 1991-11-07 1993-01-19 The United States Of America As Represented By The Administrator Of The Environmental Protection Agency Single chamber wood stove including gaseous hydrocarbon supply
GB9211825D0 (en) * 1992-05-30 1992-07-15 Potterton Myson Limited Heating appliances
DE4313575C2 (de) * 1993-04-26 1997-09-11 Wunner Gmbh & Co Kg W Überwachungseinrichtung für die Dauerzündflamme in Gasverbrauchseinrichtungen
JP3177554B2 (ja) * 1993-07-22 2001-06-18 パロマ工業株式会社 燃焼制御装置

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Publication number Publication date
AU711388B2 (en) 1999-10-14
ATE202411T1 (de) 2001-07-15
DE69613413T2 (de) 2001-10-18
NZ270528A (en) 1998-10-28
EP0727613A1 (fr) 1996-08-21
DE69613413D1 (de) 2001-07-26
AU4564596A (en) 1996-08-29

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