EP0698767B1 - Control circuit for a gas burner with monitoring of the combustion air supply - Google Patents

Control circuit for a gas burner with monitoring of the combustion air supply Download PDF

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Publication number
EP0698767B1
EP0698767B1 EP94113184A EP94113184A EP0698767B1 EP 0698767 B1 EP0698767 B1 EP 0698767B1 EP 94113184 A EP94113184 A EP 94113184A EP 94113184 A EP94113184 A EP 94113184A EP 0698767 B1 EP0698767 B1 EP 0698767B1
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EP
European Patent Office
Prior art keywords
relay
control circuit
contact
resistor
series
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Expired - Lifetime
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EP94113184A
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German (de)
French (fr)
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EP0698767A1 (en
Inventor
Derk Vegter
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Honeywell BV
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Honeywell BV
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Priority to DE59400955T priority Critical patent/DE59400955D1/en
Priority to EP94113184A priority patent/EP0698767B1/en
Publication of EP0698767A1 publication Critical patent/EP0698767A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
    • F23N2005/181—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using detectors sensitive to rate of flow of air
    • F23N2005/182—Air flow switch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/22—Timing network
    • F23N2223/26—Timing network with capacitors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/22—Timing network
    • F23N2223/28—Timing network with more than one timing element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/36—Spark ignition, e.g. by means of a high voltage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • 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
    • F23N5/00—Systems for controlling combustion
    • F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel

Definitions

  • the invention relates to a control circuit for gas burners according to the preamble of claim 1.
  • the gas burner has a pilot burner, a combustion air blower and a flow switch for monitoring the combustion air supply in order to ensure that the flow switch works properly
  • the excitation winding of a pilot burner valve is connected in series with a diode and the normally closed contact of the flow switch to an alternating current source and this series circuit is connected in parallel with a further series circuit consisting of a charging capacitor and a resistor.
  • the normally open contact of the flow switch is connected in series with the field winding. After the charging capacitor has been sufficiently charged, it provides the current for energizing a relay, the normally open contact of which switches the blower on.
  • the present invention achieves a substantial improvement over EP-A 0 566 768 in that the charging time of the charging capacitor is shortened and thus the gas supply is switched on more quickly without impairing the automatic function check of the flow switch.
  • the impedance of a fan is usually in the order of 50-100 ⁇ , while the excitation winding of a valve has a resistance of 2 k ⁇ or more.
  • the fact that it is not the excitation winding, as in EP-A 0 566 768, but the low-resistance fan that keeps the negative half-wave of the AC voltage away from the charging capacitor, means that the capacitor charges up more quickly and supplies the threshold voltage required for switching the control electronics more quickly.
  • the circuit can also be used for gas burners with a constantly burning pilot burner.
  • a combustion air blower FA and an electromagnetically actuated ignition gas valve PV and a flow switch PS in the supply air duct are assigned to the gas burner (not shown in detail).
  • An AC voltage for example the AC mains voltage, is supplied to the circuit arrangement via the connection terminals L and N.
  • the flow switch PS is provided with a changeover contact PC, which is present at the normally closed contact PNC when there is no combustion air flow and at the PNO work contact when the combustion air flow is correct.
  • a relay RY02 the changeover contact C2 of which is applied to the normally closed contact NC2 when the relay is de-energized and to the NO2 contact when the relay is energized.
  • the combustion air blower FA is connected via the normally closed contact PNC of the flow switch PS as well as the diode D04 and a resistor R01 to the normally closed contact NC2 and thus to the AC line L.
  • the series circuit of blower FA, flow switch break contact PNC and diode D04 is connected in parallel to a series circuit which comprises a resistor R05 and a charging capacitor C05.
  • a series circuit consisting of the relay RY02 and an electronic switch Q02 is connected in parallel to this charging capacitor.
  • the control electrode of the electronic switch Q02 is connected to the output A of control electronics CE (not shown in detail), which supplies a signal at that output A which is dependent on the state of charge of the charging capacitor C05.
  • connection point of resistor R05 and charging capacitor C05 can, for example, have a structure similar to that in EP-A 0 566 768 connected to the circuit arrangement connected to the components provided with the same reference numerals.
  • the present invention can also be used in an ignition and safety circuit for gas burners, as described in EP-A 0 440 872.
  • the AC voltage terminal L can be connected via the normally open contact NO2 of the relay RY2 on the one hand to the blower FA and on the other hand to the changeover contact PC of the flow switch PS.
  • the connection of the relay RY2 facing the input E of the control electronics CE is also connected to the normally open contact NO2 of the relay via a second resistor R02 and a second diode D01.
  • the impedance of the fan FA is considerably lower than the impedance of the series circuit consisting of the resistors R01 and R05.
  • the resistor R01 is connected from the connection point U1 of the diode D04 with the resistor R05 to the normally closed contact NC2 of the relay RY2.
  • the circuit arrangement shown in the drawing in the idle state works as follows: When the line L is connected to the mains AC voltage, the capacitor C05 is charged by the positive half-wave of the AC voltage via the resistors R01 and R05.
  • the flow switch PS is initially properly in its rest position, i.e. If its PC contact is at the normally closed contact PNC, the capacitor is not discharged during the negative half-wave of the sine voltage, because the voltage at the series connection of the capacitor C05 with the resistor R05 via the diode D04, the normally closed contact PNC and the low-resistance fan FA are practically short-circuited is.
  • the control electronics CE delivers a switch-on signal for the transistor Q2 at the output A.
  • Capacitor C05 can discharge through relay RY2 and transistor Q02 and cause the relay to respond. Its contact C2 now switches to make contact NO2 and thus establishes a holding circuit for relay RY2, which is connected from terminal L via make contact C2 / NO2, diode D01, resistor R02, relay RY2 and transistor Q02 to ground N. leads.
  • the contact C2 is switched over, the fan FA receives current and begins to supply combustion air.
  • the flow switch PS switches over, see above that now his changeover contact PC is connected to the make contact PNO and the gas valve PV is energized. This opens the valve and the escaping gas can ignite at any ignition device.

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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)

Description

Die Erfindung betrifft eine Steuerschaltung für Gasbrenner gemäß Gattungsbegriff des Anspruchs 1. Bei einer aus EP-A 0 566 768 bekannten Steuerschaltung dieser Art weist der Gasbrenner einen Zündbrenner, ein Verbrennungsluftgebläse sowie einen Strömungsschalter zur Überwachung der Verbrennungsluftzufuhr auf Um sicherzustellen, daß der Strömungsschalter ordnungsgemäß arbeitet, ist die Erregerwicklung eines Zündbrennerventils in Reihe mit einer Diode und dem Ruhekontakt des Strömungsschalters an eine Wechselstromquelle angeschlossen und dieser Reihenschaltung eine aus einem Ladekondensator und einem Widerstand bestehende weitere Reihenschaltung parallelgeschaltet. Der Arbeitskontakt des Strömungsschalters ist mit der Erregerwicklung in Reihe geschaltet. Nach hinreichender Aufladung des Ladekondensators stellt dieser den Strom für die Erregung eines Relais zur Verfügung, dessen Arbeitskontakt das Gebläse einschaltet.The invention relates to a control circuit for gas burners according to the preamble of claim 1. In a control circuit of this type known from EP-A 0 566 768, the gas burner has a pilot burner, a combustion air blower and a flow switch for monitoring the combustion air supply in order to ensure that the flow switch works properly , the excitation winding of a pilot burner valve is connected in series with a diode and the normally closed contact of the flow switch to an alternating current source and this series circuit is connected in parallel with a further series circuit consisting of a charging capacitor and a resistor. The normally open contact of the flow switch is connected in series with the field winding. After the charging capacitor has been sufficiently charged, it provides the current for energizing a relay, the normally open contact of which switches the blower on.

Die vorliegende Erfindung erzielt gegenüber EP-A 0 566 768 dadurch eine wesentliche Verbesserung, daß die Aufladezeit des Ladekondensators verkürzt und damit das Einschalten der Gaszuführ beschleunigt wird, ohne dabei die automatische Funktionsüberprüfung des Strömungsschalters zu beeinträchtigen. Die Impedanz eines Gebläses liegt üblicherweise in der Größenordnung vom 50 - 100 Ω, während die Erregerwicklung eines Ventils einen Widerstand von 2 kΩ oder mehr hat. Dadurch, daß nicht wie in EP-A 0 566 768 die Erregerwicklung, sondern das niederohmige Gebläse die negative Halbwelle der Wechselspannung vom Ladekondensator fernhält, lädt sich der Kondensator schneller auf und liefert schneller die zum Schalten der Steuerelektronik erforderliche Schwellwertspannung. Die Schaltung kann auch für Gasbrenner mit einem ständig brennenden Zündbrenner eingesetzt werden. Diese und weitere Vorteile ergeben sich aus der im Anspruch 1 gekennzeichneten Erfindung. Vorteilhafte Ausgestaltungen und Weiterbildungen sind in den Unteransprüchen beschrieben.The present invention achieves a substantial improvement over EP-A 0 566 768 in that the charging time of the charging capacitor is shortened and thus the gas supply is switched on more quickly without impairing the automatic function check of the flow switch. The impedance of a fan is usually in the order of 50-100 Ω, while the excitation winding of a valve has a resistance of 2 kΩ or more. The fact that it is not the excitation winding, as in EP-A 0 566 768, but the low-resistance fan that keeps the negative half-wave of the AC voltage away from the charging capacitor, means that the capacitor charges up more quickly and supplies the threshold voltage required for switching the control electronics more quickly. The circuit can also be used for gas burners with a constantly burning pilot burner. These and other advantages result from the invention characterized in claim 1. Advantageous refinements and developments are described in the subclaims.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung wiedergegebenen Ausführungsbeispiels beschrieben, wobei für Bauelemente, welche bereits in EP-A 0 566 768 dargestellt sind, die gleichen Bezugszeichen verwendet wurden. Die Schaltungsanordnung ist gleichermaßen eigensicher, wie diejenige nach der genannten EP-A 0 566 768.The invention is described below with reference to an embodiment shown in the drawing, with components already described in EP-A 0 566 768 are shown, the same reference numerals have been used. The circuit arrangement is equally intrinsically safe, like that according to EP-A 0 566 768.

Dem im einzelnen nicht dargestellten Gasbrenner sind ein Verbrennungsluftgebläse FA sowie ein elektromagnetisch betätigtes Zündgasventil PV und ein Strömungsschalter PS im Zuluftkanal zugeordnet. Der Schaltungsanordnung wird über die Anschlußklemmen L und N eine Wechselspannung, beispielsweise die Netzwechselspannung zugeführt. Der Strömungsschalter PS ist mit einem Umschaltkontakt PC versehen, der bei fehlendem Verbrennungsluftstrom am Ruhekontakt PNC und bei ordnungsgemäßem Verbrennungsluftstrom am Arbeitskontakt PNO anliegt. Ferner ist ein Relais RY02 vorhanden, dessen Umschaltkontakt C2 bei stromlosem Relais am Ruhekontakt NC2 und bei angezogenem Relais am Arbeitskontakt NO2 anliegt. Das Verbrennungsluftgebläse FA ist über den Ruhekontakt PNC des Strömungsschalters PS sowie die Diode D04 und einen Widerstand R01 an den Ruhekontakt NC2 und damit an die wechselstromführende Leitung L angeschlossen. Der Reihenschaltung von Gebläse FA, Strömungsschalter-Ruhekontakt PNC und Diode D04 ist einer Reihenschaltung parallelgeschaltet, welche einen Widerstand R05 sowie einen Ladekondensator C05 umfaßt. Diesem Ladekondensator ist eine Reihenschaltung bestehend aus dem Relais RY02 und einem elektronischen Schalter Q02 parallelgeschaltet. Die Steuerelektrode des elektronischen Schalters Q02 liegt am Ausgang A einer im einzelnen nicht dargestellten Steuerelektronik CE, welche an jenem Ausgang A ein vom Ladezustand des Ladekondensators C05 abhängiges Signal liefert. Sie ist hierzu mit ihrem Eingang E an den Verbindungspunkt von Widerstand R05 und Ladekondensator C05 angeschlossen und kann beispielsweise einen ähnlichen Aufbau haben, wie die in EP-A 0 566 768 an die mit gleichem Bezugszeichen versehenen Bauelemente angeschlossene Schaltungsanordnung. Statt dessen kann die vorliegende Erfindung auch bei einer Zünd- und Sicherheitsschaltung für Gasbrenner Anwendung finden, wie sie in EP-A 0 440 872 beschrieben ist.A combustion air blower FA and an electromagnetically actuated ignition gas valve PV and a flow switch PS in the supply air duct are assigned to the gas burner (not shown in detail). An AC voltage, for example the AC mains voltage, is supplied to the circuit arrangement via the connection terminals L and N. The flow switch PS is provided with a changeover contact PC, which is present at the normally closed contact PNC when there is no combustion air flow and at the PNO work contact when the combustion air flow is correct. There is also a relay RY02, the changeover contact C2 of which is applied to the normally closed contact NC2 when the relay is de-energized and to the NO2 contact when the relay is energized. The combustion air blower FA is connected via the normally closed contact PNC of the flow switch PS as well as the diode D04 and a resistor R01 to the normally closed contact NC2 and thus to the AC line L. The series circuit of blower FA, flow switch break contact PNC and diode D04 is connected in parallel to a series circuit which comprises a resistor R05 and a charging capacitor C05. A series circuit consisting of the relay RY02 and an electronic switch Q02 is connected in parallel to this charging capacitor. The control electrode of the electronic switch Q02 is connected to the output A of control electronics CE (not shown in detail), which supplies a signal at that output A which is dependent on the state of charge of the charging capacitor C05. For this purpose, it is connected with its input E to the connection point of resistor R05 and charging capacitor C05 and can, for example, have a structure similar to that in EP-A 0 566 768 connected to the circuit arrangement connected to the components provided with the same reference numerals. Instead, the present invention can also be used in an ignition and safety circuit for gas burners, as described in EP-A 0 440 872.

Die Wechselspannungsklemme L ist über den Arbeitskontakt NO2 des Relais RY2 einerseits an das Gebläse FA und andererseits an den Umschaltkontakt PC des Strömungsschalters PS anschließbar. Der dem Eingang E der Steuerelektronik CE zugewandte Anschluß des Relais RY2 steht ferner über einen zweiten Widerstand R02 und eine zweite Diode D01 mit dem Arbeitskontakt NO2 des Relais in Verbindung. Dabei ist die Impedanz des Gebläses FA erheblich niedriger als die Impedanz der Reihenschaltung bestehend aus den Widerständen R01 und R05. Der Widerstand R01 ist vom Verbindungspunkt U1 der Diode D04 mit dem Widerstand R05 zum Ruhekontakt NC2 des Relais RY2 geschaltet.The AC voltage terminal L can be connected via the normally open contact NO2 of the relay RY2 on the one hand to the blower FA and on the other hand to the changeover contact PC of the flow switch PS. The connection of the relay RY2 facing the input E of the control electronics CE is also connected to the normally open contact NO2 of the relay via a second resistor R02 and a second diode D01. The impedance of the fan FA is considerably lower than the impedance of the series circuit consisting of the resistors R01 and R05. The resistor R01 is connected from the connection point U1 of the diode D04 with the resistor R05 to the normally closed contact NC2 of the relay RY2.

Die in der Zeichnung im Ruhezustand wiedergegebene Schaltungsanordnung arbeitet folgendermaßen: Beim Anschluß der Leitung L an die Netzwechselspannung wird der Kondensator C05 durch die positive Halbwelle der Wechselspannung über die Widerstände R01 und R05 aufgeladen. Befindet sich der Strömungsschalter PS anfänglich ordnungsgemäß in seiner Ruhestellung, d.h. liegt sein Kontakt PC am Ruhekontakt PNC an, so wird der Kondensator während der negativen Halbwelle der Sinusspannung nicht entladen, weil die Spannung an der Reihenschaltung des Kondensators C05 mit dem Widerstand R05 über die Diode D04, den Ruhekontakt PNC und das niederohmige Gebläse FA praktisch kurzgeschlossen ist. Der absolute Wert der Spannung am Verbindungspunkt U1 während der negativen Halbwelle ist wegen der niedrigen Impedanz des Gebläses FA in dem durch dieses und den Widerstand R01 gebildeten Spannungsteiler sehr gering. Dies gilt jedoch nur solange der Strömungsschalter PS die in der Zeichnung dargestellte Ruhelage einnimmt.The circuit arrangement shown in the drawing in the idle state works as follows: When the line L is connected to the mains AC voltage, the capacitor C05 is charged by the positive half-wave of the AC voltage via the resistors R01 and R05. The flow switch PS is initially properly in its rest position, i.e. If its PC contact is at the normally closed contact PNC, the capacitor is not discharged during the negative half-wave of the sine voltage, because the voltage at the series connection of the capacitor C05 with the resistor R05 via the diode D04, the normally closed contact PNC and the low-resistance fan FA are practically short-circuited is. The absolute value of the voltage at the connection point U1 during the negative half-wave is very low because of the low impedance of the fan FA in the voltage divider formed by this and the resistor R01. However, this only applies as long as the flow switch PS assumes the rest position shown in the drawing.

Sollte der Strömungsschalter wegen irgendeines Fehlers anfänglich bereits seine Arbeitsstellung annehmen und sein Kontakt PC am Arbeitskontakt PNO anliegen und somit der erwähnte Kurzschlußkreis unterbrochen sein, so würden die positive und die negative Halbwelle des Stroms zum Kondensator C05 praktisch gleich sein und dieser nicht positiv aufgeladen werden. Eine positive Spannung am Kondensator C05 entsteht also nur, wenn sich der Strömungsschalter anfänglich ordnungsgemäß in der Ruhestellung befindet und sein Ruhekontakt PNC geschlossen ist.If the flow switch initially assumes its working position due to some fault and its PC contact is at the PNO working contact and the short circuit mentioned is thus interrupted, the positive and negative half-waves of the current to the capacitor C05 would be practically the same and the latter would not be charged positively. A positive voltage at capacitor C05 therefore only arises if the flow switch is initially properly in the rest position and its normally closed contact PNC is closed.

Übersteigt die sich langsam aufbauende Spannung am Kondensator C05 einen in der Steuerelektronik CE vorgelegten Schwellenwert, so liefert die Steuerelektronik CE am Ausgang A ein Durchschaltsignal für den Transistor Q2. Der Kondensator C05 kann sich über das Relais RY2 und den Transistor Q02 entladen und das Relais zum Ansprechen bringen. Sein Kontakt C2 legt nunmehr aufden Arbeitskontakt NO2 um und stellt damit einen Haltestromkreis für das Relais RY2 her, welcher von der Klemme L über den Arbeitskontakt C2/NO2, die Diode D01, den Widerstand R02, das Relais RY2 und den Transistor Q02 nach Masse N führt. Mit dem Umschalten des Kontakts C2 erhält das Gebläse FA Strom und beginnt mit der Zufuhr von Verbrennungsluft. Sobald das Gebläse FA hochgelaufen und ein ausreichender Verbrennungsluftstrom erreicht ist, schaltet der Strömungsschalter PS um, so daß nunmehr sein Umschaltkontakt PC mit dem Arbeitskontakt PNO verbunden ist und das Gasventil PV an Spannung legt. Damit öffnet das Ventil, und das ausströmende Gas kann sich an einer beliebigen Zündeinrichtung entzünden.If the slowly building up voltage at the capacitor C05 exceeds a threshold value presented in the control electronics CE, the control electronics CE delivers a switch-on signal for the transistor Q2 at the output A. Capacitor C05 can discharge through relay RY2 and transistor Q02 and cause the relay to respond. Its contact C2 now switches to make contact NO2 and thus establishes a holding circuit for relay RY2, which is connected from terminal L via make contact C2 / NO2, diode D01, resistor R02, relay RY2 and transistor Q02 to ground N. leads. When the contact C2 is switched over, the fan FA receives current and begins to supply combustion air. As soon as the fan FA has run up and a sufficient combustion air flow has been reached, the flow switch PS switches over, see above that now his changeover contact PC is connected to the make contact PNO and the gas valve PV is energized. This opens the valve and the escaping gas can ignite at any ignition device.

Claims (5)

  1. Control circuit for gas burners comprising a gas valve, a combustion air blower and a flow switch for monitoring the air supply characterized in that
    a) the combustion air blower (FA) connected in series with a first diode (D04) and the normally closed contact (PNC) of the flow switch (PS) constitute a first series circuit;
    b) a second series circuit consisting of a charging capacitor (C05) and a first resistor (R05) is connected in parallel to said first series circuit;
    c) these two series circuits (FA, D04, PNC; C05, R05) are connected to an A.C. source (L, N) via the normally closed contact (NC2) of a relay (RY2); and
    d) the energizing coil of said relay (RY2) is controlled by a voltage which depends on the charging condition of said charging capacitor (C05).
  2. Control circuit according to claim 1, characterized in that
    a) the energizing coil of the relay (RY02) is connected in series with an electronic switch (Q2), and this series circuit is connected in parallel to the charging capacitor (C05); and
    b) the control electrode of the electronic switch (Q02) receives a signal which depends on the charging condition of the charging capacitor (C05).
  3. Control circuit according to claim 2, characterized in that
    a) the one A.C. terminal (L) via the normally open contact (NO2) of the relay (RY02) is at the one side connected to the blower (FA) and at the other side is connected to the double throw contact (PC) of the flow switch (PS); and
    b) the normally open contact (PNO) of the flow switch (PS) is connected to the energizing coil of the gas valve (PV).
  4. Control circuit according to claim 2 or 3, characterized in that the junction (U1) between the first diode (D04) and the first resistor (R05) is connected to the normally closed contact (NC2) ofthe relay (RY02) via a second resistor (R01).
  5. Control circuit according to claim 2, 3 or 4, characterized in that the energizing coil of the relay (RY02) is connected to the normally open contact (NO2) of the relay via a third resistor (R02) and a second diode (D01).
EP94113184A 1994-08-24 1994-08-24 Control circuit for a gas burner with monitoring of the combustion air supply Expired - Lifetime EP0698767B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE59400955T DE59400955D1 (en) 1994-08-24 1994-08-24 Gas burner control circuit with monitoring of the combustion air supply
EP94113184A EP0698767B1 (en) 1994-08-24 1994-08-24 Control circuit for a gas burner with monitoring of the combustion air supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94113184A EP0698767B1 (en) 1994-08-24 1994-08-24 Control circuit for a gas burner with monitoring of the combustion air supply

Publications (2)

Publication Number Publication Date
EP0698767A1 EP0698767A1 (en) 1996-02-28
EP0698767B1 true EP0698767B1 (en) 1996-10-30

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EP94113184A Expired - Lifetime EP0698767B1 (en) 1994-08-24 1994-08-24 Control circuit for a gas burner with monitoring of the combustion air supply

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EP (1) EP0698767B1 (en)
DE (1) DE59400955D1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0855557A1 (en) 1997-01-22 1998-07-29 Honeywell B.V. Control circuit for a gas valve with monitoring of the combustion air supply
EP1126219A1 (en) 2000-02-11 2001-08-22 Honeywell B.V. Control circuit
EP1182402A1 (en) 2000-08-25 2002-02-27 Honeywell B.V. Control circuit
EP1195558A1 (en) 2000-10-06 2002-04-10 Honeywell B.V. Control circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480312B1 (en) * 1990-10-10 1994-07-27 Honeywell B.V. Air flow monitor device for burners
DE59203393D1 (en) * 1992-04-24 1995-09-28 Honeywell Bv Control circuit for gas burners with a flow switch for monitoring the air supply.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0855557A1 (en) 1997-01-22 1998-07-29 Honeywell B.V. Control circuit for a gas valve with monitoring of the combustion air supply
EP1126219A1 (en) 2000-02-11 2001-08-22 Honeywell B.V. Control circuit
EP1182402A1 (en) 2000-08-25 2002-02-27 Honeywell B.V. Control circuit
EP1195558A1 (en) 2000-10-06 2002-04-10 Honeywell B.V. Control circuit

Also Published As

Publication number Publication date
DE59400955D1 (en) 1996-12-05
EP0698767A1 (en) 1996-02-28

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