EP0548655B1 - Heating device - Google Patents

Heating device Download PDF

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Publication number
EP0548655B1
EP0548655B1 EP92120876A EP92120876A EP0548655B1 EP 0548655 B1 EP0548655 B1 EP 0548655B1 EP 92120876 A EP92120876 A EP 92120876A EP 92120876 A EP92120876 A EP 92120876A EP 0548655 B1 EP0548655 B1 EP 0548655B1
Authority
EP
European Patent Office
Prior art keywords
temperature
burner
flue gas
exceeded
threshold value
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
EP92120876A
Other languages
German (de)
French (fr)
Other versions
EP0548655A1 (en
Inventor
Joachim Berg
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.)
Nv Vaillant Sa
VAILLANT B.V.
Vaillant Austria GmbH
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
Vaillant BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vaillant Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, Vaillant BV filed Critical Vaillant Austria GmbH
Publication of EP0548655A1 publication Critical patent/EP0548655A1/en
Application granted granted Critical
Publication of EP0548655B1 publication Critical patent/EP0548655B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F23N5/022—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium 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
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/08—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/10—Measuring temperature stack temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/21—Measuring temperature outlet temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/06—Ventilators at the air intake
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/14—Fuel valves electromagnetically operated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/12—Fuel valves
    • F23N2235/16—Fuel valves variable flow or proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2237/00—Controlling
    • F23N2237/10—High or low fire

Definitions

  • the invention relates to a heating device according to the preamble of the claim.
  • Exhaust systems or exhaust pipes for heating devices with low exhaust gas temperatures can be made entirely or partially of a flammable or only temperature-resistant material. It is only necessary to provide a safety temperature limiter that prevents the maximum permissible temperature of the exhaust pipe from being exceeded.
  • the safety temperature limiter is formed by a thermal work contact which switches off the burner when a certain exhaust gas limit temperature is reached.
  • the aim of the invention is to avoid these disadvantages and to propose a heating device of the type mentioned at the outset, which prevents the exhaust gas temperature from exceeding the maximum limit value.
  • the threshold value for the power reduction can be adjusted very simply by means of an encoder to the permissible temperatures for the exhaust pipe, whereby the same components can always be used, regardless of the materials used for the exhaust pipe.
  • Linking the actual values of the flow temperature and the exhaust gas temperature and their target value or threshold value by means of a microcomputer results in a very simple construction of an evaluation circuit, it being possible to use the evaluation circuit not only to protect the exhaust gas line against overheating care, but also to control the burner depending on the heat demand according to a heating curve.
  • the heating device has a burner 2 which is arranged in a combustion chamber 1 and is supplied with a fuel gas / air mixture via a blower 3 and a gas line 5 controlled via a solenoid valve 4.
  • a heat exchanger 6 is arranged above the burner 2 and is connected to a radiator device (not shown) via a feed line 7 and a return line 8 in which a pump 9 is arranged.
  • the air required for the blower 3 passes through an annular gap 11 surrounding an exhaust pipe 10 into the interior of the housing 12 and from there to the suction side of the blower 3.
  • a temperature sensor 13 is arranged, which is connected to an evaluation circuit 14 via a connecting line 20. This is also connected to a sensor 16 which detects the temperature of the feed water via a line 17.
  • the evaluation circuit 14 has an exhaust gas target temperature value transmitter 15 for selecting a threshold value for the emission of a signal that prevents the fuel supply.
  • the evaluation circuit controls the blower 3 via the line 18 in order to influence the load on the burner 3 and, via a line 19, the solenoid valve 4, which controls the gas supply to the burner 2.
  • the evaluation circuit 14 has a microprocessor 21 which also serves as a threshold circuit and which, when the temperature value of the exhaust gas approaches the set threshold value, for example up to 10 ° C., has an output of the burner 2 reducing signal.
  • the evaluation circuit 14 has a microprocessor 21 which is connected to the sensor 13 which detects the temperature of the exhaust gas via an analog-digital converter 22. Furthermore, an exhaust gas setpoint value transmitter 15, a sensor 16 that detects the temperature of the flow of a heating system (not shown in more detail) and a flow setpoint transmitter 25 are each connected on the input side to the microprocessor 21 via analog / digital converter 22. On the output side, the microprocessor 21 is connected via digital-analog converter 23 to the blower 3 of the burner 2 and the solenoid valve 4, which controls the gas supply to the burner. A display 26 and a voltage supply 24 are also connected to the microprocessor 21.
  • the functional sequence of the evaluation circuit 14 is shown in FIG. 3.
  • the actual exhaust gas temperature T Aist which is detected by the sensor 13, the set maximum value of the exhaust gas temperature T Amax and the target value for the flow temperature T Vsoll are processed as input variables .
  • the instantaneous exhaust gas temperature T Aist is continuously compared with the set maximum exhaust gas temperature T Amax . If the difference between T Amax - T Aist is zero or negative, the maximum permissible exhaust gas temperature has been reached or exceeded. In this case, the burner 2 is locked.
  • the target specification for the flow temperature T Vsoll is reduced according to a predetermined algorithm until the safety margin to the switch-off value is restored.

Abstract

Heating device with a burner acting upon a heat exchanger and a waste gas pipe made of a combustible or only limitedly temperature-resistant material, in the connection region of which to a combustion chamber receiving the burner a safety temperature limiter is arranged, which, when a given temperature is exceeded, emits a signal which influences the fuel supply of the burner. In order, in the case of such a burner, to avoid a predetermined temperature of the waste gas being exceeded, it is envisaged that the safety temperature limiter is formed by a temperature sensor (13), which is arranged in the waste gas line (10), and an evaluating circuit (14) which processes the signals of the sensor and which comprises a threshold switch, which causes the burner (2) to be switched off when the threshold is exceeded, and a control circuit which, when a predetermined threshold is approached, emits a signal which influences the output adjustment of the burner (2) with the effect of a reduction thereof. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Heizeinrichtung gemäß dem Oberbegriff des Patentanspruchs.The invention relates to a heating device according to the preamble of the claim.

Abgasanlagen beziehungsweise Abgasleitungen für Heizgeräte mit niedrigen Abgastemperaturen können ganz oder teilweise aus einem brennbaren oder nur begrenzt temperaturbeständigen Material hergestellt sein. Dabei ist es lediglich erforderlich, einen Sicherheitstemperaturbegrenzer vorzusehen, der ein Überschreiten der maximal zulässigen Temperatur der Abgasleitung verhindert.Exhaust systems or exhaust pipes for heating devices with low exhaust gas temperatures can be made entirely or partially of a flammable or only temperature-resistant material. It is only necessary to provide a safety temperature limiter that prevents the maximum permissible temperature of the exhaust pipe from being exceeded.

Aus der US-PS 4 296 727 ist ein Kontrollsystem zur Alarmgebung bei gefährlichen oder ungewünschten Betriebszuständen eines Heizgerätes bekanntgeworden.From US Pat. No. 4,296,727 a control system for alarming in dangerous or undesired operating states of a heater has become known.

Bei einer aus der EP-PS 0 240 390 bekannten Heizeinrichtung ist der Sicherheitstemperaturbegrenzer durch einen Thermoarbeitskontakt gebildet, der bei Erreichen einer bestimmten Abgasgrenztemperatur den Brenner abschaltet. Dadurch ergibt sich jedoch der Nachteil, daß keine Möglichkeit besteht, einer Überschreitung der Ansprechtemperatur des Sicherheitstemperaturbegrenzers vorzubeugen.In a heating device known from EP-PS 0 240 390, the safety temperature limiter is formed by a thermal work contact which switches off the burner when a certain exhaust gas limit temperature is reached. However, this results in the disadvantage that there is no possibility of preventing the response temperature of the safety temperature limiter from being exceeded.

Ziel der Erfindung ist es, diese Nachteile zu vermeiden und eine Heizeinrichtung der eingangs erwähnten Art vorzuschlagen, bei der einem Überschreiten des maximalen Grenzwertes der Abgastemperatur vorgebeugt wird.The aim of the invention is to avoid these disadvantages and to propose a heating device of the type mentioned at the outset, which prevents the exhaust gas temperature from exceeding the maximum limit value.

Erfindungsgemäß wird dies durch die kennzeichnenden Merkmale des Patentanspruchs erreicht.According to the invention, this is achieved by the characterizing features of the patent claim.

Dadurch ergibt sich der Vorteil, daß bereits bei einer Annäherung der Abgastemperatur an den vorgegebenen Grenzwert in den Betrieb des Brenners derart eingegriffen wird, daß ein weiteres Ansteigen der Abgastemperatur unterbleibt, wodurch einer Stillsetzung des Brenners vorgebeugt wird. Dabei kann der Schwellwert für die Leistungsreduzierung sehr einfach mittels eines Gebers auf die für die Abgasleitung verwendeten Materialien zulässigen Temperaturen abgestimmt werden, wobei stets die gleichen Bauteile eingesetzt werden können, unabhängig von für die Abgasleitung verwendeten Materialien. Durch die Verknüpfung der Ist-Werte der Vorlauftemperatur und der Abgastemperatur und deren Soll-Wert beziehungsweise Schwellwert mittels eines Mikrocomputers ergibt sich ein sehr einfacher Aufbau einer Auswerteschaltung, wobei es möglich ist, mit der Auswerteschaltung nicht nur für den Schutz der Abgasleitung gegen eine Überhitzung zu sorgen, sondern auch den Brenner in Abhängigkeit vom Wärmebedarf entsprechend einer Heizkurve zu steuern.This results in the advantage that, when the exhaust gas temperature approaches the predetermined limit value, the operation of the burner is intervened in such a way that the exhaust gas temperature does not rise further, thereby preventing the burner from being shut down. The threshold value for the power reduction can be adjusted very simply by means of an encoder to the permissible temperatures for the exhaust pipe, whereby the same components can always be used, regardless of the materials used for the exhaust pipe. Linking the actual values of the flow temperature and the exhaust gas temperature and their target value or threshold value by means of a microcomputer results in a very simple construction of an evaluation circuit, it being possible to use the evaluation circuit not only to protect the exhaust gas line against overheating care, but also to control the burner depending on the heat demand according to a heating curve.

Die Erfindung wird nun anhand der Zeichnung näher erläutert.The invention will now be explained in more detail with reference to the drawing.

Dabei zeigt:

  • Figur 1 schematisch eine erfindungsgemäße Heizeinrichtung,
  • Figur 2 schematisch eine Auswerteschaltung und
  • Figur 3 ein Funktionsschema der Auswerteschaltung.
It shows:
  • FIG. 1 schematically shows a heating device according to the invention,
  • Figure 2 shows schematically an evaluation circuit and
  • Figure 3 is a functional diagram of the evaluation circuit.

In allen Figuren bedeuten gleiche Bezugszeichen jeweils gleiche Einzelheiten.In all figures, the same reference numerals denote the same details.

Die Heizeinrichtung weist einen in einer Brennkammer 1 angeordneten Brenner 2 auf, der über ein Gebläse 3 und eine über ein Magnetventil 4 gesteuerte Gasleitung 5 mit einem Brenngas-Luftgemisch beaufschlagt wird. Über dem Brenner 2 ist ein Wärmetauscher 6 angeordnet, der über eine Vorlaufleitung 7 und eine Rücklaufleitung 8, in der eine Pumpe 9 angeordnet ist, mit einer nicht dargestellten Heizkörpereinrichtung verbunden ist.The heating device has a burner 2 which is arranged in a combustion chamber 1 and is supplied with a fuel gas / air mixture via a blower 3 and a gas line 5 controlled via a solenoid valve 4. A heat exchanger 6 is arranged above the burner 2 and is connected to a radiator device (not shown) via a feed line 7 and a return line 8 in which a pump 9 is arranged.

Die für das Gebläse 3 notwendige Luft gelangt über einen eine Abgasleitung 10 umgebenden Ringspalt 11 in das Innere des Gehäuses 12 und von dort zur Saugseite des Gebläses 3.The air required for the blower 3 passes through an annular gap 11 surrounding an exhaust pipe 10 into the interior of the housing 12 and from there to the suction side of the blower 3.

Im der Brennkammer 1 nahen Bereich der Abgasleitung 10, die aus brennbarem oder nur begrenzt temperaturbeständigem Material hergestellt ist, ist ein Temperaturfühler 13 angeordnet, der mit einer Auswerteschaltung 14 über eine Anschlußleitung 20 verbunden ist. Diese ist auch mit einem die Temperatur des Vorlaufwassers erfassenden Fühler 16 über eine Leitung 17 verbunden.In the area of the exhaust gas line 10 near the combustion chamber 1, which is made of flammable or only temperature-resistant material to a limited extent, a temperature sensor 13 is arranged, which is connected to an evaluation circuit 14 via a connecting line 20. This is also connected to a sensor 16 which detects the temperature of the feed water via a line 17.

Die Auswerteschaltung 14 weist einen Abgas-Solltemperatur-Wertgeber 15 zur Auswahl eines Schwellwertes für die Abgabe eines die Brennstoffzufuhr unterbindenden Signales auf.The evaluation circuit 14 has an exhaust gas target temperature value transmitter 15 for selecting a threshold value for the emission of a signal that prevents the fuel supply.

Weiter steuert die Auswerteschaltung über die Leitung 18 das Gebläse 3, um die Belastung des Brenners 3 zu beeinflussen, und mit einer Leitung 19 das Magnetventil 4, das die Gaszufuhr zum Brenner 2 steuert.Furthermore, the evaluation circuit controls the blower 3 via the line 18 in order to influence the load on the burner 3 and, via a line 19, the solenoid valve 4, which controls the gas supply to the burner 2.

Dabei weist die Auswerteschaltung 14, wie aus der Figur 2 zu ersehen ist, einen Mikroprozessor 21 auf, der auch als Schwellwertschaltung dient und der bei einer Annäherung des Temperaturwertes des Abgases an den eingestellten Schwellwert, zum Beispiel bis auf 10 °C, ein die Leistung des Brenners 2 verminderndes Signal abgibt.The evaluation circuit 14, as can be seen from FIG. 2, has a microprocessor 21 which also serves as a threshold circuit and which, when the temperature value of the exhaust gas approaches the set threshold value, for example up to 10 ° C., has an output of the burner 2 reducing signal.

Wie aus der Figur 2 zu ersehen ist, weist die Auswerteschaltung 14 einen Mikroprozessor 21 auf, der mit dem die Temperatur des Abgases erfassenden Fühler 13 über einen Analog-Digitalwandler 22 verbunden ist. Weiterhin ist ein Abgas-Solltemperatur-Wertgeber 15, ein die Temperatur des Vorlaufes einer nicht weiter dargestellten Heizungsanlage erfassender Fühler 16 und ein Vorlauf-Soll-Wertgeber 25 jeweils über Analog-Digitalwandler 22 eingangsseitig mit dem Mikroprozessor 21 verbunden. Ausgangsseitig ist der Mikroprozessor 21 über Digital-Analogwandler 23 mit dem Gebläse 3 des Brenners 2 und dem Magnetventil 4 verbunden, das die Gaszufuhr zum Brenner steuert. Weiter ist an den Mikroprozessor 21 noch eine Anzeige 26 und eine Spannungsversorgung 24 verbunden.As can be seen from FIG. 2, the evaluation circuit 14 has a microprocessor 21 which is connected to the sensor 13 which detects the temperature of the exhaust gas via an analog-digital converter 22. Furthermore, an exhaust gas setpoint value transmitter 15, a sensor 16 that detects the temperature of the flow of a heating system (not shown in more detail) and a flow setpoint transmitter 25 are each connected on the input side to the microprocessor 21 via analog / digital converter 22. On the output side, the microprocessor 21 is connected via digital-analog converter 23 to the blower 3 of the burner 2 and the solenoid valve 4, which controls the gas supply to the burner. A display 26 and a voltage supply 24 are also connected to the microprocessor 21.

Der Funktionsablauf der Auswerteschaltung 14 ist in der Figur 3 dargestellt. Als Eingangsgrößen werden die tatsächliche Abgastemperatur TAist, die vom Fühler 13 erfaßt wird, der eingestellte Maximalwert der Abgastemperatur TAmax und der Soll-Wert für die Vorlauftemperatur TVsoll verarbeitet. Es wird die momentane Abgastemperatur TAist mit der eingestellten maximalen Abgastemperatur TAmax fortlaufend verglichen. Wird die Differenz aus TAmax - TAist Null oder negativ, so ist die maximal zulässige Abgastemperatur erreicht oder überschritten. In diesem Fall wird der Brenner 2 verriegelnd abgeschaltet.The functional sequence of the evaluation circuit 14 is shown in FIG. 3. The actual exhaust gas temperature T Aist , which is detected by the sensor 13, the set maximum value of the exhaust gas temperature T Amax and the target value for the flow temperature T Vsoll are processed as input variables . The instantaneous exhaust gas temperature T Aist is continuously compared with the set maximum exhaust gas temperature T Amax . If the difference between T Amax - T Aist is zero or negative, the maximum permissible exhaust gas temperature has been reached or exceeded. In this case, the burner 2 is locked.

Liegt die tatsächliche Abgastemperatur TAist innerhalb eines Toleranzbandes von zum Beispiel 10° Kelvin unterhalb des Abschaltwertes TAmax, wird die Soll-Vorgabe für die Vorlauftemperatur TVsoll nach einem vorgegebenen Algorithmus reduziert, bis der Sicherheitsabstand zum Abschaltwert wieder hergestellt ist.If the actual exhaust gas temperature T Aist is within a tolerance band of, for example, 10 ° Kelvin below the switch-off value T Amax , the target specification for the flow temperature T Vsoll is reduced according to a predetermined algorithm until the safety margin to the switch-off value is restored.

Claims (1)

  1. Heating device with a heat exchanger (6) heated by a burner (2), and a flue gas conduit (10) made of a flammable material or a material of only limited temperature resistance, comprising a safety temperature limiter provided in the connection area between the said conduit and a combustion chamber (1) accommodating the burner (2), such temperature limiter producing a signal influencing the fuel supply to the burner (2) when a certain temperature is exceeded and being composed of a temperature sensor (13) provided in the flue gas conduit (10) and an evaluation unit (14) processing the signals supplied by the temperature sensor, such evaluation unit (14) comprising a threshold circuit which, when a first threshold value (TAmax) for the flue gas temperature is exceeded, acts to shut off the burner (2), characterized in that the evaluation unit (14) comprises a microprocessor (21) which on its input side is connected to the temperature sensor (13) in the flue gas conduit (10), to a flue gas setpoint selector (15) for setting the first threshold value (TAmax) and a second, lower threshold value for the flue gas temperature, to a temperature sensor (16) for sensing the upstream temperature and to an upstream temperature setpoint selector (25), and which on its output side is connected to a solenoid valve (4) controlling the fuel supply to the burner and, if necessary, to a blower (3) associated with the burner (2), and that, in addition, the evaluation unit (14), when the second, lower threshold value is exceeded, acts to reduce the setpoint setting for the upstream temperature (TVsetp) in accordance with a preset algorithm in such a way that the calorific output of the bumer (2) is influenced towards a reduction of the same.
EP92120876A 1991-12-12 1992-12-08 Heating device Expired - Lifetime EP0548655B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2469/91 1991-12-12
AT0246991A AT401569B (en) 1991-12-12 1991-12-12 HEATING DEVICE

Publications (2)

Publication Number Publication Date
EP0548655A1 EP0548655A1 (en) 1993-06-30
EP0548655B1 true EP0548655B1 (en) 1997-05-14

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Application Number Title Priority Date Filing Date
EP92120876A Expired - Lifetime EP0548655B1 (en) 1991-12-12 1992-12-08 Heating device

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EP (1) EP0548655B1 (en)
AT (2) AT401569B (en)
DE (2) DE4242382A1 (en)
DK (1) DK0548655T3 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4325414C2 (en) * 1993-07-29 2000-02-17 Daimler Chrysler Ag Deformation sensor for a safety device to protect vehicle occupants in the event of a side impact
US5379794A (en) * 1994-01-25 1995-01-10 Emerson Electric Co. Gas control valve having polymeric material body combined with thermally responsive gas shutoff valve having metallic body
EP0892215B1 (en) * 1997-07-18 2002-11-20 WEBASTO THERMOSYSTEME GmbH Method for controlling the overheat protection for a heater
GB0002263D0 (en) * 2000-02-02 2000-03-22 Smiths Industries Plc Gas appliances and control systems
PL200089B1 (en) * 2000-02-02 2008-12-31 Vaillant Joh Gmbh & Co Heat radiator with a protective temperature limiter
DE102021006085A1 (en) 2021-12-09 2023-06-15 Truma Gerätetechnik GmbH & Co. KG Device for heating air

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1027863B (en) * 1955-12-07 1958-04-10 Vaillant Joh Kg Automatic control device for gas water heater with heat exchanger
US3971344A (en) * 1974-01-10 1976-07-27 Saunier Duval Safety device for instant water heater
US4296727A (en) * 1980-04-02 1981-10-27 Micro-Burner Systems Corporation Furnace monitoring system
FR2549204B1 (en) * 1983-07-13 1988-04-29 Maillet Marcel CONSTANT TEMPERATURE SUPPLY AIR GENERATOR
FR2596501B1 (en) * 1986-03-28 1990-04-27 Sdecc SAFETY DEVICE FOR A GAS BOILER OF THE TYPE WITH CONTROLLED MECHANICAL VENTILATION
JPS63254315A (en) * 1987-04-09 1988-10-21 Matsushita Electric Ind Co Ltd Safety device for hot air space heater

Also Published As

Publication number Publication date
DE59208493D1 (en) 1997-06-19
AT401569B (en) 1996-10-25
EP0548655A1 (en) 1993-06-30
ATA246991A (en) 1996-02-15
ATE153122T1 (en) 1997-05-15
DK0548655T3 (en) 1997-12-01
DE4242382A1 (en) 1993-06-17

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