EP0197334B1 - Circuit to control a fuel-heated heat source - Google Patents

Circuit to control a fuel-heated heat source Download PDF

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Publication number
EP0197334B1
EP0197334B1 EP86103155A EP86103155A EP0197334B1 EP 0197334 B1 EP0197334 B1 EP 0197334B1 EP 86103155 A EP86103155 A EP 86103155A EP 86103155 A EP86103155 A EP 86103155A EP 0197334 B1 EP0197334 B1 EP 0197334B1
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EP
European Patent Office
Prior art keywords
switch
circuit
relay
circuit according
resistor
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
EP86103155A
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German (de)
French (fr)
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EP0197334A1 (en
Inventor
W. Dr. Ing. Hangauer
Dieter Bark
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Vaillant BV
Original Assignee
Vaillant Austria GmbH
Nv Vaillant Sa
Joh Vaillant GmbH and Co
Vaillant GmbH
Vaillant SARL
Vaillant Ltd
SCHONEWELLE BV
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Application filed by Vaillant Austria GmbH, Nv Vaillant Sa, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, SCHONEWELLE BV filed Critical Vaillant Austria GmbH
Priority to AT86103155T priority Critical patent/ATE60833T1/en
Publication of EP0197334A1 publication Critical patent/EP0197334A1/en
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Publication of EP0197334B1 publication Critical patent/EP0197334B1/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
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical 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
    • F23N5/187—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel using electrical or electromechanical means
    • 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
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays

Definitions

  • the present invention relates to a circuit for controlling a fuel-heated heat source.
  • blower-assisted fuel-heated heat sources there is a requirement to ensure that the blower has started before the fuel path is released and that the air throughput required for the respective combustion is guaranteed.
  • the present invention is therefore based on the object of specifying a circuit with which the start-up of such a blower can be monitored and the presence of a correct air throughput can be ensured.
  • the task is accordingly reduced to the presence of a proper air throughput, which of course is then only forced by the burner and its thermal lift.
  • the circuit according to FIG. 1 is a gas-heated water heater with an atmospheric burner 1, which lies in the course of a gas line 2, which is controlled by a valve 3 that is opened or closed by an electromagnet 4.
  • This electromagnet 4 is integrated in a line 5.
  • the line 5 leads to a first branch point 7 and to a second branch point 8. From the branch point 7, a line provided with a resistor 9 leads to positive operating voltage + UB and a further line 10 leads to a contact 11 of a changeover switch 12, the root of which is connected to the Junction 8 is connected.
  • the other contact 13 of the switch 12 is part of a line 14 which is also connected to a positive operating voltage UB.
  • a line provided with a relay coil 15 leads to ground 18 via a collector-emitter path 16 of a transistor 17.
  • the transistor 17 is operated as an electronic switch, and can therefore also be represented by a further relay contact.
  • the control electrode 19 of the transistor is via a line 20 connected to a device which emits a signal for starting the water heater.
  • the changeover switch 12 is actuated by the relay coil 15.
  • a relay 26 is actuated by the relay coil 15 via the operative connection 27, which in turn actuates a switching contact 25 via the operative connection 28.
  • a controllable semiconductor switch can also be used.
  • the branch point 7 is connected to ground 18 via a capacitor 21, an anemometer contact 23 being connected in parallel via a line 22.
  • a controllable semiconductor can also be used.
  • the contact 23 is actuated in any case when an air throughput sufficient for the fuel throughput from the burner 1 is determined in the supply line or exhaust line. Any other air flow meter can be used instead of an anemometer.
  • the switch contact 25 is connected in parallel to the anemometer contact 23 via a line.
  • the present invention has for its object to monitor the proper functioning of this contact 23 or its technical equivalents. It can be assumed that this monitoring is carried out during the ongoing operation of the heat source or at standstill cannot take place, but only when the state changes, the state change of the contact 23 being monitored. It is essential for the circuit that both the anemometer contact 23 such as the capacitor 21 and the coil 15 of the relay are parallel to one another, the coil 15 in turn being in series with a switch 17 and the branching point 7 from the relay coil via a switch contact 11 can be decoupled and the coil 4 of the gas solenoid valve is parallel to this contact 11/12.
  • both the now discharging capacitor 21 and the additional current flow through the resistor 9 excite the coil 15 and thus switch the switch 12 to the contact 13.
  • the relay in FIG. 1 completes the switching process that has started once, despite opening contact 11, that is, contact 11 only opens after contact 13 closes.
  • the relay now remains in this switching state for as long as electronic switch 17 is conductive.
  • the timer 26 is actuated via the active connection 27, with the result that the switch 25 is closed for a specific delay time via the active connection 28.
  • the anemometer contact 23 does not close and the solenoid valve is closed again when the contact 25 is opened.
  • the solenoid valve 4 or the relay 15 can only be de-energized with sufficient air throughput by the disappearance of the control deviation signal on the line 20.
  • a change of contact of the contact 23 is urgently necessary and also monitored, since otherwise the charge of the capacitor is not possible when the contact 23 remains closed, but this in turn is a prerequisite for the excitation of the coil 15 . Exciting this coil and thus the switching of the switch 12 are in turn a prerequisite for a current flow through the magnet 4 of the valve 3.
  • the circuit has been modified to the extent that the changeover switch 12 has been replaced by a pure make contact in connection with a diode 30.
  • This diode is in the forward direction from point 7 towards point 8. If the polarity between UB and ground is reversed, the diode must be switched in the reverse direction. The same also applies to the polarity of transistor 17.
  • a resistor 40 is looped into the line 20 and the relay 15 is provided with an additional normally open contact 41 which is looped into the line 5 of the electromagnet 4.
  • the line 5 runs from the branch point 7 via the electromagnet of the solenoid valve and the contact 41 at + UB.
  • This circuit has the advantage that a malfunction of the transistor 17 can also be monitored, since in this embodiment the energy requirement of the latch circuit is taken from the control signal on the line 20.
  • the coil 15 receives its excitation energy after actuation of the associated self-holding contact 13 via the path of transistor 17, contact 13 and line 42.
  • the exemplary embodiment according to FIG. 4 relates to a gas-heated circulating water heater with combustion air supply or removal via a fan.
  • the difference to Figures 1 to 3 is that there is no automatic air supply due to thermals. This means that the anemometer contact remains open without fan control, but that on the other hand a proper air supply and thus closing the anemometer contact is a prerequisite for enabling the fuel path.
  • the anemometer is therefore not operated indirectly by the thermal of the burner, but by a separate blower motor.
  • a state-of-charge meter 53 is connected via a resistor 52 located in a line 51, the other side of which is connected via a line 54 to a logic 55, the output line 56 of which is connected to the base 19 of the transistor 17.
  • Another input 57 of logic 55 is connected to a connection point 58 which is connected to the emitter of transistor 17, a resistor 59 being situated between the latter and ground 18.
  • a controller 61 is connected to the collector of the transistor 17 via a line 60, with which a motor of the fan 62 is put into operation can, who is responsible for the combustion air supply to the burner 1, which runs in a channel 63, in which channel the anemometer 64 is provided.
  • a normally open contact 6 is additionally provided, which can be actuated by a controller 65. It is closed when the burner is to be switched on.
  • the logic 55 has a further input line 66, which is connected to the controller 65 once and is connected to the normally open contact 13 via the line 42.
  • the line 66 to the logic 55 leads to a signal which serves to prepare the start-up of the heat source and which leads the actual burner switch-on signal on the active line 67, in particular in order to ensure, for example, the air throughput and the purging times.
  • This signal can also be used to ventilate the combustion chamber.
  • a switch-on signal occurs on line 20 before capacitor 21 is charged, relay coil 15 cannot be energized, since switching on transistor 17 via line 60 likewise switches on Switch-on signal is applied to the controller 61 of the fan 62, which causes the anemometer contact 23 not to open as a result of the air flow occurring in the air duct 63.
  • the voltage of the capacitor 21 is detected via the state-of-charge meter 53 and actuation of the electronic switch 17 is only permitted when a sufficient state of charge of the capacitor has been reached for the relay to be energized.
  • the circuit is modified in that the resistor 9 is split into two resistors 70 and 71 and the line 51 is connected to the connection point 72 of both resistors.
  • the resistor 52 is omitted, the charging voltage control 53 is connected directly to + UB via a line 73.
  • the advantage of this circuit lies in the fact that, in contrast to the exemplary embodiment according to FIG. 4, in which both resistors 9 and 52 must be designed to be short-circuit proof, only resistor 71 need be designed to be short-circuit proof.
  • the circuit 53 is designed in such a way that it acts as a Schmitt trigger and only switches off when a certain voltage drop across the resistor 71 is exceeded, that is to say gives a switch-off signal on the line 54 and only switches on again as a switch-on voltage value when there is a smaller voltage drop across the resistor 71.
  • Figure 6 shows the embodiment of a logic circuit 55 which has the task on the one hand to prevent at not relay energized and insufficient charge state of the capacitor 21, the switching on of the transistor 17, on the other hand, 17 to block but after completion of tightening the re-switching of the transistor in the discharge of the capacitor 21 . That way ensures that the fan is switched off and remains on when the relay has dropped, for example by briefly interrupting the heat request signal on line 20. After the mechanical run-on time of the fan has elapsed, the anemometer 64 again reports lack of air, that is to say the switch 23 opens. Only then are the prerequisites for a new start-up given, including charging the capacitor, switching on the relay and controlling the fan.
  • the logic circuit with a further input 87, at which a signal can be fed in which leads to the transistor 17 being switched off.
  • This input is connected to the anemometer output (23) with the interposition of an edge-triggered timing element, so that a short switch-off pulse is switched to the base of transistor 17 when contact 23 is opened.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Abstract

Circuit to control a gas-heated circulating water heater with a relay, the coil of which is connected to an operating voltage via at least one resistance, there being arranged parallel to the coil (15) of the relay both a capacitor (21) and a switch (23) of an air deficiency safety device, a second switch (11/12,30) lying in series with the relay coil (15) in such a manner that the relay has a self- holding circuit (12/13) and that the latter during self-holding separates the relay coil from the capacitor and from the switch (23) by means of the second switch, a third switch (17) being arranged in series with the relay coil (15) and it being possible to pick up a signal for the freeing of the fuel path (3) directly at the connections (7, 8) of the second switch (11/12 or 30). <IMAGE>

Description

Die vorligende Erfindung bezieht sich auf eine Schaltung zur Steuerung einer brennstoffbeheizten Wärmequelle.The present invention relates to a circuit for controlling a fuel-heated heat source.

Aus der US-PS 4 189 296 sind ein Verfahren und eine Vorrichtung zur Überwachung des Schornsteinzuges für eine brennstoffbeheizte Wärmequelle bekanntgeworden, bei der im Schornstein eine Abgas­klappe vorgesehen ist, die von einem Motor in eine Öffnungs- und Schließstellung gebracht werden kann. Es ist eine Druckdose vorhanden, mit der ein ausreichender Unterdruck im Schornstein zwischen dem Wärmetauscher, der brennstoffbeheizten Wärmequelle aund der Abgasklappe abgeführt werden kann. Es ist sichergestellt, daß die brennstoffbeheizte Wärmequelle nur nach Vorhandensein eines ausreichenden Schornsteinzuges beziehungsweise Schornstein­unterdrucks in Betrieb gehen kann.From US-PS 4 189 296 a method and a device for monitoring the chimney draft for a fuel-heated heat source have become known, in which an exhaust flap is provided in the chimney, which can be brought into an open and closed position by an engine. There is a pressure socket with which a sufficient vacuum in the chimney can be dissipated between the heat exchanger, the fuel-heated heat source and the flue gas flap. It is ensured that the fuel-heated heat source can only go into operation if there is sufficient chimney draft or negative pressure in the chimney.

Insbesondere bei gebläseunterstützten brennstoffbeheizten Wärme­quellen ergibt sich die Forderung, vor Freigabe des Brennstoffwegs sicherzustellen, daß das Gebläse angelaufen ist und weiterhin daß ein für die jeweilige Verbrennung notwendiger Luftdurch­satz gewährleistet ist.In the case of blower-assisted fuel-heated heat sources in particular, there is a requirement to ensure that the blower has started before the fuel path is released and that the air throughput required for the respective combustion is guaranteed.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Schaltung anzugeben, mit der der Anlauf eines solchen Gebläses Überwacht und das Vorhandensein eines ordnungsgemäßen Luftdurchsatzes sichergestellt werden kann. Bei gebläselosen Geräten reduziert sich demgemäß die Aufgabe auf das Vorhandensein eines ordnungsgemäßen Luftdurchsatzes, der dann natürlich erst durch den Brenner und dessen thermischen Auftrieb erzwungen wird.The present invention is therefore based on the object of specifying a circuit with which the start-up of such a blower can be monitored and the presence of a correct air throughput can be ensured. In the case of fanless devices, the task is accordingly reduced to the presence of a proper air throughput, which of course is then only forced by the burner and its thermal lift.

Die Lösung der Aufgabe gelingt mit den Merkmalen der nebengeodne­ten, unabhängigen Patentansprüche.The problem is solved with the features of the parallel, independent claims.

Weitere Ausgestaltungen und besonders vorteilhafte Wei­terbildungen der Erfindung sind Gegenstand der Unteran­sprüche beziehungsweise gehen aus der nachfolgenden Beschreibung hervor, die 5 Ausführungsbeispiele anhand der Figuren 1 bis 6 näher erläutert.Further refinements and particularly advantageous developments of the invention are the subject of the subclaims or emerge from the following description which explains 5 exemplary embodiments in more detail with reference to FIGS. 1 to 6.

Es zeigen:

  • Figur 1 eine erste Schaltung,
  • Figur 2 eine zweite Schaltung,
  • Figur 3 eine dritte Variante zu den Schaltungen gemäß Figur 1 und 2 und
  • die Figuren 4 und 5 weitere Varianten, die alle bezüglich des Grundprinzips gleichwertig, hinsichtlich spezieller weiterer Anforderungen allerdings unterschiedliche Be­deutung aufweisen,
  • Figur 6 zeigt ein Ausführungsbeispiel einer Logikschal­tung gemäß Figur 4 und Figur 5.
Show it:
  • FIG. 1 shows a first circuit,
  • FIG. 2 shows a second circuit,
  • Figure 3 shows a third variant of the circuits of Figures 1 and 2 and
  • Figures 4 and 5 further variants, all equivalent in terms of the basic principle, with regard to more specific other requirements have different meanings,
  • FIG. 6 shows an exemplary embodiment of a logic circuit according to FIG. 4 and FIG. 5.

Bei der Schaltung gemäß Figur 1 handelt es sich um einen gasbeheizten Wasserheizer mit atmosphärischem Brenner 1, der im Zuge einer Gasleitung 2 liegt, die von einem Ven­til 3 beherrscht ist, das von einem Elektromagneten 4 ge­öffnet oder geschlossen wird. Dieser Elektromagnet 4 ist in eine Leitung 5 eingebunden. Die Leitung 5 führt zu ei­nem ersten Verzweigungspunkt 7 und zu einem zweiten Ver­zweigungspunkt 8. Von dem Verzweigungspunkt 7 führt eine mit einem Widerstand 9 versehene Leitung zu positiver Be­triebsspannung +UB und eine weitere Leitung 10 zu einem Kontakt 11 eines Umschalters 12, dessen Wurzel mit dem Verzweigungspunkt 8 verbunden ist. Der andere Kontakt 13 des Umschalters 12 ist Teil einer Leitung 14, die auch an positive Betriebsspannung UB angeschlossen ist. Vom Ver­zweigungspunkt 8 führt eine mit einer Relaisspule 15 ver­sehene Leitung über eine Kollektor-Emitter-Strecke 16 ei­nes Transistors 17 an Masse 18. Der Transistor 17 wird als elektronischer Schalter betrieben, er kann daher eben­so durch einen weiteren Relaiskontakt dargestellt werden. Die Steuerelektrode 19 des Transistors ist über eine Leitung 20 an eine Einrichtung angeschlossen die ein Signal zum Inbetriebgehen des Wasserheizers abgibt. Der Umschal­ter 12 ist von der Relaisspule 15 betätigt. Weiterhin wird von der Relaisspule 15 über die Wirkverbindung 27 ein Zeitglied 26 betätigt, das seinerseits über die Wirk­verbindung 28 einen Schaltkontakt 25 betätigt. Statt ei­nes Kontaktes 25 kann auch ein steuerbarer Halbleiter­schalter Verwendung finden.The circuit according to FIG. 1 is a gas-heated water heater with an atmospheric burner 1, which lies in the course of a gas line 2, which is controlled by a valve 3 that is opened or closed by an electromagnet 4. This electromagnet 4 is integrated in a line 5. The line 5 leads to a first branch point 7 and to a second branch point 8. From the branch point 7, a line provided with a resistor 9 leads to positive operating voltage + UB and a further line 10 leads to a contact 11 of a changeover switch 12, the root of which is connected to the Junction 8 is connected. The other contact 13 of the switch 12 is part of a line 14 which is also connected to a positive operating voltage UB. From the branch point 8, a line provided with a relay coil 15 leads to ground 18 via a collector-emitter path 16 of a transistor 17. The transistor 17 is operated as an electronic switch, and can therefore also be represented by a further relay contact. The control electrode 19 of the transistor is via a line 20 connected to a device which emits a signal for starting the water heater. The changeover switch 12 is actuated by the relay coil 15. Furthermore, a relay 26 is actuated by the relay coil 15 via the operative connection 27, which in turn actuates a switching contact 25 via the operative connection 28. Instead of a contact 25, a controllable semiconductor switch can also be used.

Der Verzweigungspunkt 7 ist über einen Kondensator 21 mit Masse 18 verbunden, wobei über eine Leitung 22 ein Anemometerkontakt 23 parallelgeschaltet ist. Statt eines Kontaktes 23 kann auch ein steuerbarer Halbleiter einge­setzt werden. Der Kontakt 23 wird jedenfalls dann be­tätigt, wenn ein für den Brennstoffdurchsatz vom Brenner 1 ausreichender Luftdurchsatz in der Zufuhrleitung oder Abgasleitung festgestellt wird. Statt eines Anemometers kann auch ein anderer beliebiger Luftdurchsatzmesser ver­wendet werden. Der Schaltkontakt 25 ist über eine Leitung zu dem Anemometerkontakt 23 parallelgeschaltet.The branch point 7 is connected to ground 18 via a capacitor 21, an anemometer contact 23 being connected in parallel via a line 22. Instead of a contact 23, a controllable semiconductor can also be used. The contact 23 is actuated in any case when an air throughput sufficient for the fuel throughput from the burner 1 is determined in the supply line or exhaust line. Any other air flow meter can be used instead of an anemometer. The switch contact 25 is connected in parallel to the anemometer contact 23 via a line.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, das ordnungsgemäße Arbeiten dieses Kontaktes 23 oder sei­ner technischen Äquivalente zu überwachen. Es kann hier­bei davon ausgegangen werden, daß während des laufenden Betriebs der Wärmequelle oder bei Stillstand diese Überwachung nicht stattfinden kann, sondern nur bei einem Wechsel des Zustandes, wobei hierbei der Zustandswechsel des Kontaktes 23 überwacht wird. Wesentlich für die Schaltung ist, daß sowohl der Anemometerkontakt 23 wie der Kondensator 21 als auch die Spule 15 des Relais parallel zueinander liegen, wobei die Spule 15 ihrerseits mit einem Schalter 17 in Reihe liegt und wobei der Ver­zweigungspunkt 7 von der Relaisspule über einen Schalt­kontakt 11 entkoppelbar ist und die Spule 4 des Gasma­gnetventils parallel zu diesem Kontakt 11/12 liegt.The present invention has for its object to monitor the proper functioning of this contact 23 or its technical equivalents. It can be assumed that this monitoring is carried out during the ongoing operation of the heat source or at standstill cannot take place, but only when the state changes, the state change of the contact 23 being monitored. It is essential for the circuit that both the anemometer contact 23 such as the capacitor 21 and the coil 15 of the relay are parallel to one another, the coil 15 in turn being in series with a switch 17 and the branching point 7 from the relay coil via a switch contact 11 can be decoupled and the coil 4 of the gas solenoid valve is parallel to this contact 11/12.

Zur Funktion der Schaltung gemäß Figur 1 ist folgendes auszuführen, ausgehend vom Ruhezustand (Kontakte 23 und 25 geöffnet, Umschalter 12 am Kontakt 11, Spule 15 strom­los, Schalter 17 geöffnet, Magnetventil 4 stromlos):For the function of the circuit according to FIG. 1, the following must be carried out, starting from the idle state (contacts 23 and 25 open, changeover switch 12 on contact 11, coil 15 de-energized, switch 17 open, solenoid valve 4 de-energized):

Das Anliegen von positiver Betriebsspannung +UB führt über den Widerstand 9 zum Aufladen des Kondensators 21, sofern die Schalter 23 und 25 offen sind, was aber bei nichtströmender Verbrennungsluft aufgrund des erloschenen Brenners und des nicht angesteuerten Zeitgliedes 26 der Fall ist. Der elektronische Schalter 17 ist gesperrt, da­mit kann die Spule 15 nicht stromdurchsetzt werden und das Magnetventil 4 nicht geöffnet werden. Die Höhe des Widerstandswertes des Widerstandes 9 ist so bemessen, daß weder das Magnetventil 4 noch das Relais 15/12 über den Widerstand zum Um- beziehungsweise Einschalten gebracht werden kann. Andererseits muß der Widerstand 9 möglichst klein bemessen werden, um ein schnelles Aufladen des Kondensators 21 zu ermöglichen. Ist der Kondensator 21 aufgeladen und wird der elektronische Schalter 17 durch ein entsprechendes Signal auf der Leitung 20 leitend ge­schaltet, so bewirkt sowohl der sich nun entladende Kon­densator 21 wie der zusätzliche Stromfluß über den Widerstand 9 ein Erregen der Spule 15 und damit ein Umschalten des Umschalters 12 auf den Kontakt 13. Damit wird zunächst der Anzugspfad für die Spule 15 abgeschal­tet, andererseits ein Selbsthaltekreis für diese Spule geschaltet, indem nunmehr die Selbsthaltung über die Lei­tung 14 und den Kontakt 12/13 erfolgt. Dabei wird voraus­gesetzt, daß das Relais in Figur eins den einmal begonnenen Umschaltvorgang trotz Öffnen des Kontaktes 11 zu Ende führt, das heißt, der Kontakt 11 öffnet erst nach dem Schließen des Kontaktes 13. Das Relais bleibt nun so lange in diesem Schaltzustand, wie der elektronische Schalter 17 leitend ist. Gleichzeitig mit dem Umschalten des Schalters 12 wird über die Wirkverbindung 27 das Zeitglied 26 angesteuert mit der Folge, daß über die Wirkverbindung 28 der Schalter 25 für eine bestimmte Ver­zögerungszeit geschlossen wird.The presence of positive operating voltage + UB leads via resistor 9 to charging capacitor 21, provided switches 23 and 25 are open, but this is the case when the combustion air is not flowing due to the extinguished burner and the uncontrolled timer 26. The electronic switch 17 is blocked so that the coil 15 cannot be energized and the solenoid valve 4 cannot be opened. The level of the resistance value of the resistor 9 is such that neither the solenoid valve 4 nor the relay 15/12 over the Resistance can be switched on or off. On the other hand, the resistor 9 must be dimensioned as small as possible in order to enable the capacitor 21 to be charged quickly. If the capacitor 21 is charged and the electronic switch 17 is turned on by a corresponding signal on the line 20, both the now discharging capacitor 21 and the additional current flow through the resistor 9 excite the coil 15 and thus switch the switch 12 to the contact 13. This first switches off the pull-in path for the coil 15, and on the other hand switches a latching circuit for this coil, in that the latching now takes place via the line 14 and the contact 12/13. It is assumed that the relay in FIG. 1 completes the switching process that has started once, despite opening contact 11, that is, contact 11 only opens after contact 13 closes. The relay now remains in this switching state for as long as electronic switch 17 is conductive. Simultaneously with the switch 12 being switched over, the timer 26 is actuated via the active connection 27, with the result that the switch 25 is closed for a specific delay time via the active connection 28.

Nunmehr wird die Spule 4 von +UB über die Leitung 14, über den Kontakt 12/13, den Punkt 8, die Leitung 5, den Punkt 7, die Leitung 24 und den mittlerweile geschlos­senen Kontakt 25 erregt. Nach Ablauf der im Zeitglied initiierten Verzögerungszeit öffnet der Kontakt 25 wieder. Ist aufgrund des am Brenner 1 austretenden Brennstoffs, der gezündet wird, und der damit entstehenden Thermik ein ausreichender Luftdurchsatz eingetreten, so ist der Kontakt 23 des Anemometers inzwischen betätigt und übernimmt die Leitungsverbindung für den öffnenden parallelgeschalteten Kontakt 25.Now the coil 4 from + UB via line 14, excited via contact 12/13, point 8, line 5, point 7, line 24 and the now closed contact 25. After the delay time initiated in the timer expires, the contact 25 opens again. If a sufficient air throughput has occurred due to the fuel escaping from the burner 1, which is ignited, and the resulting thermals, the contact 23 of the anemometer has meanwhile been actuated and takes over the line connection for the opening, parallel-connected contact 25.

Ist kein ausreichender Luftdurchsatz zustandegekommen, so schließt der Anemometerkontakt 23 nicht und das Magnet­ventil wird mit dem Öffnen des Kontaktes 25 wieder geschlossen.If there is not sufficient air throughput, the anemometer contact 23 does not close and the solenoid valve is closed again when the contact 25 is opened.

Das Magnetventil 4 beziehungsweise das Relais 15 können bei ausreichendem Luftdurchsatz nur noch durch Verschwin­den des Regelabweichungssignals auf der Leitung 20 ent­regt werden. Bei jedem neuen Anlauf der Schaltung be­ziehungsweise jedem Starten des Brenners wird demgemäß ein Kontaktwechsel des Kontakts 23 dringend notwendig und auch überwacht, da anderenfalls bei geschlossen bleibendem Kontakt 23 die Ladung des Kondensators nicht möglich ist, die aber ihrerseits Voraussetzung für die Erregung der Spule 15 ist. Das Erregen dieser Spule und damit das Umschalten des Umschalters 12 sind aber ihrer­seits Voraussetzung für einen Stromfluß durch den Ma­gneten 4 des Ventils 3.The solenoid valve 4 or the relay 15 can only be de-energized with sufficient air throughput by the disappearance of the control deviation signal on the line 20. With each new start of the circuit or each start of the burner, a change of contact of the contact 23 is urgently necessary and also monitored, since otherwise the charge of the capacitor is not possible when the contact 23 remains closed, but this in turn is a prerequisite for the excitation of the coil 15 . Exciting this coil and thus the switching of the switch 12 are in turn a prerequisite for a current flow through the magnet 4 of the valve 3.

Beim Ausführungsbeispiel gemäß Figur 2 ist die Schaltung insoweit abgewandelt worden, als daß der Umschalter 12 durch einen reinen Arbeitskontakt in Verbindung mit einer Diode 30 ersetzt wurde. Diese Diode liegt in Durchlaß­richtung vom Punkt 7 in Richtung auf den Punkt 8. Ist die Polarität zwischen UB und Masse vertauscht, muß die Diode in Sperrichtung geschaltet sein. Das gleiche gilt auch für die Polarität des Transistors 17.In the exemplary embodiment according to FIG. 2, the circuit has been modified to the extent that the changeover switch 12 has been replaced by a pure make contact in connection with a diode 30. This diode is in the forward direction from point 7 towards point 8. If the polarity between UB and ground is reversed, the diode must be switched in the reverse direction. The same also applies to the polarity of transistor 17.

Beim Ausführungsbeispiel gemäß Figur 3 ist in die Lei­tung 20 ein Widerstand 40 eingeschleift und das Relais 15 mit einem zusätzlichen Arbeitskontakt 41 versehen, der in die Leitung 5 des Elektromagneten 4 eingeschleift ist. Die Leitung 5 verläuft vom Verzweigungspunkt 7 über den Elektromagneten des Magnetventils und den Kontakt 41 an +UB.In the exemplary embodiment according to FIG. 3, a resistor 40 is looped into the line 20 and the relay 15 is provided with an additional normally open contact 41 which is looped into the line 5 of the electromagnet 4. The line 5 runs from the branch point 7 via the electromagnet of the solenoid valve and the contact 41 at + UB.

Diese Schaltung hat den Vorteil, daß auch eine Fehlfunk­tion des Transistors 17 überwacht werden kann, da bei diesem Ausführungsbeispiel der Energiebedarf des Selbst­haltekreises aus dem Ansteuersignal auf der Leitung 20 entnommen wird. Die Spule 15 erhält nach Betätigung des zugehörigen Selbsthaltekontaktes 13 ihre Erregungsenergie über den Pfad des Transistors 17, den Kontakt 13 und die Leitung 42.This circuit has the advantage that a malfunction of the transistor 17 can also be monitored, since in this embodiment the energy requirement of the latch circuit is taken from the control signal on the line 20. The coil 15 receives its excitation energy after actuation of the associated self-holding contact 13 via the path of transistor 17, contact 13 and line 42.

Das Ausführungbeispiel gemäß Figur 4 bezieht sich auf einen gasbeheizten Umlaufwasserheizer mit Verbrennungs­luftzufuhr beziehungsweise -abfuhr über ein Gebläse. Der Unterschied zu den Figuren 1 bis 3 liegt darin, daß hier keine selbsttätige Luftzufuhr infolge Thermik stattfindet. Das heißt, daß der Anemometerkontakt ohne Gebläseansteue­rung offen bleibt, daß aber andererseits eine ordnungs­gemäße Luftzufuhr und damit ein Schließen des Anemometer­kontaktes Voraussetzung für eine Freigabe des Brennstoff­weges ist. Das Anemometer wird demgemäß nicht durch die Thermik des Brenners, sondern durch einen gesonderten Ge­bläsemotor indirekt betätigt. An den Punkt 7 ist über ei­nen in einer Leitung 51 liegenden Widerstand 52 ein Lade­zustandsmesser 53 angeschlossen, der auf seiner anderen Seite über eine Leitung 54 mit einer Logik 55 verbunden ist, deren Ausgangsleitung 56 auf die Basis 19 des Tran­sistors 17 geschaltet ist. Ein anderer Eingang 57 der Logik 55 ist an einen Verbindungspunkt 58 angeschlossen, der an den Emitter des Transistors 17 angeschlossen ist, wobei zwischen dem Letzterwähnten und Masse 18 ein Wider­stand 59 liegt. An den Kollektor des Transistors 17 ist über eine Leitung 60 eine Steuerung 61 angeschlossen, mit der ein Motor des Gebläses 62 in Betrieb gesetzt werden kann, der für die Verbrennungsluftzufuhr zum Brenner 1 verantwortlich ist, die in einem Kanal 63 verläuft, wobei in diesem Kanal das Anemometer 64 vorgesehen ist. Im Zuge der Leitung 5 ist zusätzlich ein Arbeitskontakt 6 vorge­sehen, der von einem Regler 65 betätigbar ist. Er wird geschlossen, wenn eine Brennereinschaltung erfolgen soll. Die Logik 55 weist eine weitere Eingangsleitung 66 auf, die einmal an den Regler 65 angebunden ist und zum zwei­ten über die Leitung 42 an den Arbeitskontakt 13 ange­schlossen ist.The exemplary embodiment according to FIG. 4 relates to a gas-heated circulating water heater with combustion air supply or removal via a fan. The difference to Figures 1 to 3 is that there is no automatic air supply due to thermals. This means that the anemometer contact remains open without fan control, but that on the other hand a proper air supply and thus closing the anemometer contact is a prerequisite for enabling the fuel path. The anemometer is therefore not operated indirectly by the thermal of the burner, but by a separate blower motor. At point 7, a state-of-charge meter 53 is connected via a resistor 52 located in a line 51, the other side of which is connected via a line 54 to a logic 55, the output line 56 of which is connected to the base 19 of the transistor 17. Another input 57 of logic 55 is connected to a connection point 58 which is connected to the emitter of transistor 17, a resistor 59 being situated between the latter and ground 18. A controller 61 is connected to the collector of the transistor 17 via a line 60, with which a motor of the fan 62 is put into operation can, who is responsible for the combustion air supply to the burner 1, which runs in a channel 63, in which channel the anemometer 64 is provided. In the course of line 5, a normally open contact 6 is additionally provided, which can be actuated by a controller 65. It is closed when the burner is to be switched on. The logic 55 has a further input line 66, which is connected to the controller 65 once and is connected to the normally open contact 13 via the line 42.

Bezüglich der Funktion der Schaltung nach Figur 4 ist zu bemerken, daß die Leitung 66 zur Logik 55 ein zur Vorbe­reitung des Inbetriebgehens der Wärmequelle dienendes Signal führt, das dem eigentlichen Brennereinschaltsignal auf der Wirkungsleitung 67 voreilt, insbesondere um bei­spielsweise den Luftdurchsatz und die Vorspülzeiten sicherzustellen. Dieses Signal kann auch der Nachentlüf­tung des Feuerraums dienen.With regard to the function of the circuit according to FIG. 4, it should be noted that the line 66 to the logic 55 leads to a signal which serves to prepare the start-up of the heat source and which leads the actual burner switch-on signal on the active line 67, in particular in order to ensure, for example, the air throughput and the purging times. This signal can also be used to ventilate the combustion chamber.

Die Funktion der Schaltung nach Figur 4 ist folgende:The function of the circuit according to Figure 4 is as follows:

Unter der Voraussetzung, daß, zurückgreifend auf Figur 3, ein Einschaltsignal auf der Leitung 20 erfolgt, bevor der Kondensator 21 geladen ist, so kann die Relaisspule 15 nicht erregt werden, da durch das Einschalten des Tan­sistors 17 über die Leitung 60 gleichermaßen ein Einschaltsignal an die Steuerung 61 des Gebläses 62 gelegt wird, was infolge der sich im Luftkanal 63 einstellenden Luftströmung das Nichtöffnen des Anemometerkontaktes 23 bewirkt. Um das auszuschließen, wird über den Ladezu­standsmesser 53 die Spannung des Kondensators 21 erfaßt und ein Betätigen des elektronischen Schalters 17 erst dann zugelassen, wenn ein für das Anziehen des Relais ausreichender Ladezustand des Kondensators erreicht ist. Das Einschalten der Relaisspule 15 führt aber zu einem Stromfluß im Widerstand 59 und damit zu einem Spannungs­potential am Punkt 58, womit über die Leitung 57 der Logik 55 ein Signal zugeführt wird, durch das die von der Ladekontrolle 53 des Kondensators abgegebenen Signale hinsichtlich ihrer Auswirkung auf den elektronischen Schalter 17 unwirksam gemacht werden. Es wird nämlich, da über die Leitung 60 der Lüfter mittlerweile angelaufen ist, durch Einschalten des Kontaktes 23 des Anemometers der Kondensator entladen, wobei die Ladezustandskontrolle 53 über die Leitung 54 wieder ein Sperrsignal abgibt, das nach erfolgtem Relaisanzug jedoch unwirksam bleiben muß. Durch entsprechende Beschaltung der Steuerung 61 wird sichergestellt, daß der Lüfter 62 nur dann anlaufen kann, wenn der Transistor 17 leitend geworden ist. Nunmehr kann durch Betätigen des Schalters 6 die Wärmequelle durch Öffnen des Gasventils in Betrieb gehen.Provided that, based on FIG. 3, a switch-on signal occurs on line 20 before capacitor 21 is charged, relay coil 15 cannot be energized, since switching on transistor 17 via line 60 likewise switches on Switch-on signal is applied to the controller 61 of the fan 62, which causes the anemometer contact 23 not to open as a result of the air flow occurring in the air duct 63. To rule this out, the voltage of the capacitor 21 is detected via the state-of-charge meter 53 and actuation of the electronic switch 17 is only permitted when a sufficient state of charge of the capacitor has been reached for the relay to be energized. Switching on the relay coil 15, however, leads to a current flow in the resistor 59 and thus to a voltage potential at the point 58, with the result that a signal is supplied to the logic 55 via the line 57, through which the signals emitted by the charge control 53 of the capacitor relate to their effect the electronic switch 17 are made ineffective. It is namely, since the fan has meanwhile started up via line 60, the capacitor is discharged by switching on the contact 23 of the anemometer, the state of charge control 53 again issuing a blocking signal via line 54 which, however, must remain ineffective after relay activation has taken place. Appropriate wiring of the controller 61 ensures that the fan 62 can only start when the transistor 17 has become conductive. Now the heat source can be operated by opening the gas valve by operating the switch 6.

Beim Ausführungsbeispiel gemäß Figur 5 ist die Schaltung insoweit abgewandelt, als daß der Widerstand 9 in zwei Widerstände 70 und 71 aufgespalten ist und die Leitung 51 an den Verbindungspunkt 72 beider Widerstände angeschlos­sen ist. Der Widerstand 52 ist entfallen, die Ladespan­nungskontrolle 53 ist über eine Leitung 73 unmittelbar mit +UB verbunden. Der Vorteil dieser Schaltung liegt darin, daß im Gegensatz zum Ausführungsbeispiel nach Figur 4, bei dem beide Widerstände 9 und 52 kurzschluß­fest ausgebildet sein müssen, hier nur der Widerstand 71 kurzschlußfest gestaltet sein muß.In the exemplary embodiment according to FIG. 5, the circuit is modified in that the resistor 9 is split into two resistors 70 and 71 and the line 51 is connected to the connection point 72 of both resistors. The resistor 52 is omitted, the charging voltage control 53 is connected directly to + UB via a line 73. The advantage of this circuit lies in the fact that, in contrast to the exemplary embodiment according to FIG. 4, in which both resistors 9 and 52 must be designed to be short-circuit proof, only resistor 71 need be designed to be short-circuit proof.

Die Schaltung 53 ist so ausgebildet, daß die als Schmitt-­Trigger wirkt und nur bei Überschreiten eines bestimmten Spannungsabfalls am Widerstand 71 ausschaltet, das heißt ein Ausschaltsignal auf die Leitung 54 gibt und erst bei einem kleineren Spannungsabfall am Widerstand 71 als ei­nen Einschaltspannungswert wieder einschaltet.The circuit 53 is designed in such a way that it acts as a Schmitt trigger and only switches off when a certain voltage drop across the resistor 71 is exceeded, that is to say gives a switch-off signal on the line 54 and only switches on again as a switch-on voltage value when there is a smaller voltage drop across the resistor 71.

Figur 6 zeigt das Ausführungsbeispiel einer Logikschal­tung 55, die zur Aufgabe hat, einerseits bei nicht ange­zogenem Relais und ungenügendem Ladezustand des Kondensators 21 das Einschalten des Transistors 17 zu verhindern, andererseits aber nach erfolgtem Anzug das Wiederausschalten des Transistors 17 bei Entladung des Kondensators 21 zu blockieren. Auf diese Weise wird sichergestellt, daß das Gebläse bei abgefallenem Relais, etwa durch kurzzeitiges Unterbrechen des Wärmeanforde­rungssignals auf Leitung 20, ausgeschaltet wird und bleibt. Nach Ablauf der mechanischen Nachlaufzeit des Ge­bläses meldet das Anemometer 64 wieder Luftmangel, das heißt der Schalter 23 öffnet. Damit erst sind die Vor­aussetzungen für einen erneuten Anlaufvorgang wieder ge­geben, beinhaltend das Aufladen des Kondensators, Einschalten des Relais und Ansteuerung des Lüfters.Figure 6 shows the embodiment of a logic circuit 55 which has the task on the one hand to prevent at not relay energized and insufficient charge state of the capacitor 21, the switching on of the transistor 17, on the other hand, 17 to block but after completion of tightening the re-switching of the transistor in the discharge of the capacitor 21 . That way ensures that the fan is switched off and remains on when the relay has dropped, for example by briefly interrupting the heat request signal on line 20. After the mechanical run-on time of the fan has elapsed, the anemometer 64 again reports lack of air, that is to say the switch 23 opens. Only then are the prerequisites for a new start-up given, including charging the capacitor, switching on the relay and controlling the fan.

Weiter ist es vorstellbar, die Logikschaltung mit einem weiteren Eingang 87 zu versehen, an dem ein Signal einge­speist werden kann, das zum Abschalten des Transistors 17 führt. Dieser Eingang wird unter Zwischenschaltung eines flankengetriggerten Zeitgliedes mit dem Anemometerausgang (23) verbunden, so daß beim Öffnen des Kontaktes 23 ein kurzer Ausschaltimpuls an die Basis des Transistors 17 geschaltet wird. Mit dieser Maßnahme wird nach einer Luftmangelmeldung (23 öffnet) während des Brennerbetriebs ein erneuter Anlauf erzwungen, wie bereits oben erläutert.It is also conceivable to provide the logic circuit with a further input 87, at which a signal can be fed in which leads to the transistor 17 being switched off. This input is connected to the anemometer output (23) with the interposition of an edge-triggered timing element, so that a short switch-off pulse is switched to the base of transistor 17 when contact 23 is opened. With this measure, after an air deficiency message (23 opens), a renewed start-up is forced during burner operation, as already explained above.

Claims (20)

1. A circuit for controlling a fuel-­firing heat source comprising a relay having a coil (15), which is connected by at least one resistor (9) to a supply voltage source, a capacitor (21) and a first switch (23) of an air-deficiency protective device connected in parallel to the coil (15) of the relay, which comprises a self-holding circuit (12/13); a second switch (11-13; 30), which is connected in series with the relay coil (15) and which in a self-­holding mode disconnects the relay coil from the capa­citor and from the first switch, further comprising a third switch (17), which is connected in series with the relay coil, and a solenoid valve which is provided in the fuel flow path (3) and has an electromagnet (4) connected in parallel to the second switch (11-13; 30), wherein the resistor (9) is such that the relay cannot be operated via the resistor and a starting of the heat source will result in a closing of the third switch (17) to effect a discharge of the capacitor through the relay coil (15) so that the second switch (11-13) closes the self-holding circuit and the first switch (23), which is operated in case of a sufficient supply of air to the heat source, is caused to operate the electromagnet, which is connected in parallel to the second switch (11, 12; 30) Figures 1) and 2).
2. A circuit for controlling a fuel-­firing heat source comprising a relay having a coil (15), which is connected by at least one resistor (9) to a supply voltage source, a capacitor (21) and a first switch (23) of an air-deficiency protective device connected in parallel to the coil (15) of the relay, which comprises a self-holding circuit (12/13); a second switch (12; 30), which in a self-holding mode disconnects the relay coil from the capacitor and from the first switch; wherein the relay further comprises a second make contact (41); further comprising a third switch (17), which is connected in series with the relay coil, and a solenoid valve which is provided in the fuel flow path (3) and has an electromagnet (4) connected in series with the second make contact (41) and connected to the first switch (23), in paral­lel to the second switch (11-13; 30), wherein the resistor (9) is such that the relay cannot be operated via the resistor and a starting of the heat source will result in a closing of the third switch (17) to effect a discharge of the capacitor through the relay coil (15) so that the second switch (12/13) closes the self-holding circuit and the first switch (23), which is operated in case of a sufficient supply of air to the heat source and the also closed second make contact (41) causes the electromagnet (4) to be operated (Figure 3).
3. A circuit according to claim 1 or 2, characterized in that the circuit comprises a control input (20) and the third switch (17) is a controllable switch, which is operable by the signal delivered to the control input (20).
4. A circuit according to claim 3, charac­terized in that the self-holding circuit of the relay is fed from the control input (20).
5. A circuit according to any of claims 2 to 4, characterized in that the second switch (30) is a controllable semiconductor switch.
6. A circuit according to any of claims 1 to 5, characterized in that a timer (26) is provided, which is operated by the relay coil (15), and a further switch (25) is connected in parallel to the switch (23) of the air-deficiency protective device and is operated by the timer.
7. A circuit according to any of claims 1 to 5, characterized in that the circuit (55) for controlling the third switch (17) includes a logic circuit (55), which has a signal input (66) for the signal delivered to the control input (20) of the circuit and further inputs (54, 57) for signals inid­cating the state of the circuit.
8. A circuit according to claim 7, characterized in that a state-of-charge signal gene­rator (53) is provided for monitoring the state of charge of the capacitor (21) and the output (54) of the state-of-charge signal generator is connected to one input of the logic circuit (55).
9. A circuit according to claim 8, characterized in that the state-of-charge signal gene­rator (53) monitors the voltage across the capacitor (21).
10. A circuit according to claim 8, characterized in that the state-of-charge signal generator (53) monitors the current for charging the capacitor or the voltage drop across the resistor (9).
11. A circuit according to claim 10, characterized in that the resistor (9) consists of a voltage divider (70, 71), the output signal of which constitutes an input signal for the state-­of-charge signal generator (53).
12. A circuit according to any of claims 8 to 11, characterized in that the state-of-charge signal generator (53) exhibits a Schmitt trigger behavior.
13. A circuit according to any of claims 7 to 12, characterized in that circuit means (59) are provided for delivering a signal as the relay is operated and the output of said circuit means is connected to an input (57) of the logic circuit (55).
14. A circuit according to claim 13, characterized in that the circuit means (59) consist of a shunt resistor, which is flown through by the coil current of the relay.
15. A circuit according to any of claims 7 to 14, characterized in that a signal for activat­ing a fresh air or exhaust gas fan (62) is taken from the output (60) of the third switch (17).
16. A circuit according to any of claims 7 to 15, characterized in that the circuit for control­ling the third switch (17) is derived from a voltage divider (82, 84) having a ratio of division which is variable by a controllable resistor (80).
17. A circuit according to claim 16, characterized in that the signal for controlling the controllable resistor (80) is derived from a voltage divider (85, 86), which has a ratio of divi­sion that is variable by a controllable resistor (81) having a control electrode which is connected to one input (57) of the logic circuit.
18. A circuit according to any of claims 7 to 17, characterized in that the logic circuit (55) has a further input (87), which is operable to pre­vent the closing of the third switch (17).
19. A circuit according to claim 18, characterized in that an edge-triggered further timer is provided and is connected to the switch (23) of the air-deficiency protective device and is triggered in response to the opening of said switch (23) and delivers an output signal to the input (87) of the logic circuit (55).
20. A circuit according to any of claims 1 to 19, characterized in that a further resistor is connected in series with the capacitor (21).
EP86103155A 1985-03-13 1986-03-08 Circuit to control a fuel-heated heat source Expired - Lifetime EP0197334B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86103155T ATE60833T1 (en) 1985-03-13 1986-03-08 CIRCUIT FOR CONTROLLING A FUEL HEATED HEAT SOURCE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8507718U 1985-03-13
DE8507718 1985-03-13

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EP0197334A1 EP0197334A1 (en) 1986-10-15
EP0197334B1 true EP0197334B1 (en) 1991-02-06

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DE (1) DE3677398D1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0399062A1 (en) * 1989-05-22 1990-11-28 Wilhelm Eugene Ekermans Monitoring of gas flow
US5271375A (en) * 1990-06-13 1993-12-21 Ekermans Wilhelm E Monitoring of gas flow
DE59102338D1 (en) * 1990-10-10 1994-09-01 Honeywell Bv Air flow monitoring device for burner systems.
AT407914B (en) * 1999-08-09 2001-07-25 Vaillant Gmbh CONTROL CIRCUIT FOR A GAS VALVE

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3340527A (en) * 1965-01-13 1967-09-05 Technical Marketing Associates Condition monitoring system
US4189296A (en) * 1978-03-13 1980-02-19 Johnson Controls, Inc. Method and apparatus for controlling furnace
US4336791A (en) * 1980-05-12 1982-06-29 Kitchhen John A Pulse combustion apparatus
US4403942A (en) * 1980-11-18 1983-09-13 Carrier Corporation Self-checking safety switch control circuit

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EP0197334A1 (en) 1986-10-15
DE3677398D1 (en) 1991-03-14

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