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EP0327785B1 - Control method for a heat source - Google Patents

Control method for a heat source Download PDF

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Publication number
EP0327785B1
EP0327785B1 EP88730028A EP88730028A EP0327785B1 EP 0327785 B1 EP0327785 B1 EP 0327785B1 EP 88730028 A EP88730028 A EP 88730028A EP 88730028 A EP88730028 A EP 88730028A EP 0327785 B1 EP0327785 B1 EP 0327785B1
Authority
EP
European Patent Office
Prior art keywords
control
gas valve
gas
fan
heat source
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
EP88730028A
Other languages
German (de)
French (fr)
Other versions
EP0327785A1 (en
Inventor
Winfried Dr. Hangauer
Reiner Kind
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
Vaillant NV
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, Vaillant NV, Joh Vaillant GmbH and Co, Vaillant GmbH, Vaillant SARL, Vaillant Ltd, Vaillant BV filed Critical Vaillant Austria GmbH
Priority to EP88730028A priority Critical patent/EP0327785B1/en
Priority to AT88730028T priority patent/ATE99403T1/en
Priority to DE88730028T priority patent/DE3886727D1/en
Publication of EP0327785A1 publication Critical patent/EP0327785A1/en
Application granted granted Critical
Publication of EP0327785B1 publication Critical patent/EP0327785B1/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
    • F23N5/24—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
    • F23N1/00—Regulating fuel supply
    • F23N1/06—Regulating fuel supply conjointly with draught
    • F23N1/062—Regulating fuel supply conjointly with draught using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/04—Measuring pressure
    • F23N2225/06—Measuring pressure for determining flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2225/00—Measuring
    • F23N2225/08—Measuring temperature
    • F23N2225/18—Measuring temperature feedwater temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/10—Fail safe for component failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2233/00—Ventilators
    • F23N2233/02—Ventilators in stacks
    • F23N2233/04—Ventilators in stacks with variable speed
    • 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
    • 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
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods

Definitions

  • the present invention relates to a method for controlling a circulating water heater according to the preamble of the claim.
  • a method for controlling a circulating water heater in the gas line of which two gas valves are arranged.
  • the first is operated by a control and regulating device in proportional operation, the second is kept open hydraulically even when a pump of the central heating generates a differential pressure, which indicates a water throughput in the circulating water heater.
  • a flame ionization sensor an exhaust gas fan, a differential pressure sensor in the supply air line, an automatic burner control, which is part of the control and regulating device, and an ignition device for the burner.
  • the circulating water heater is operated so that when a switch-on control command is present, the motor of the circulating pump is first supplied with voltage.
  • the circulation pump starts up, and due to the water throughput there is a differential pressure and thus a signal, which leads to the opening of one gas valve leads.
  • the control and regulating device applies voltage to the motor of the exhaust gas fan, so that it starts up.
  • the sealed combustion chamber of the circulating water heater is flushed with fresh air, the throughput of fresh air is measured at the differential pressure sensor in the supply air path and reported back to the control and regulating device.
  • the ignition is released, which means that the other gas valve also receives an opening command so that the gas line to the burner is open; at the same time the main burner is ignited. After a flame has been formed, the existence of this flame is reported back to the control and regulating device by the ionization sensor. This means that the circulation water heater is operating correctly. If the flow temperature reaches the target value, a control shutdown takes place, which means that one of the two gas valves is de-energized and closes. A run-on time can result for the exhaust gas fan, likewise for the circulation pump, so that the other gas valve does not necessarily have to close.
  • the present invention is therefore based on the object of preventing this unsanitary operation.
  • a circulating water heater 1 has a sealed combustion chamber 2, in which a heat exchanger 3 and a gas burner 4 are arranged.
  • the combustion chamber 2 communicates with the atmosphere via a concentric double tube 5, an annular gap 6 between an inner tube 7 and an outer tube 8 defining a fresh air path, while the exhaust gas path 9 is formed by the cross section of the inner tube, in which an exhaust gas fan 10 is arranged, which is driven by a motor 11.
  • a differential pressure sensing point 13 is arranged in the annular supply air path 12 and is connected to a control or regulating device 15 via a measuring line 14.
  • the heat exchanger 3 is connected to a flow line 16 which is provided with a flow temperature sensor 17 which is connected to the control or regulating device 15 via a measuring line 18.
  • a consumer 19 in the form of a plurality of radiators or a domestic hot water tank connected in series or in parallel is connected to the feed line 16.
  • a return line 20 is provided between the consumer 19 and the heat exchanger 3, into which a circulation pump 21 is switched on, into which a drive motor is integrated, which is connected to the control or regulating device 15 with an electrical supply line 22.
  • From the pump supply and return connection leads - after Type of water shortage protection - each a pressure measuring line 23 or 24 to a differential pressure measuring device 25, which transmits the pressure difference to an actuating rod 26 which is connected directly to a valve body of a second gas valve 27.
  • This gas valve 27 lies in the course of a gas line 28, in series with a first gas valve 29, which is connected to the control or regulating device 15 via a control line 30.
  • the electromagnetic servomotor for the first gas valve 29 is integrated in this gas valve 29.
  • An ionization flame detector 31 is assigned to the burner 4 and is connected to the control or regulating device 15 via a measuring line 32.
  • the drive motor 11 of the fan 10 is connected to the control or regulating device 15 via a control line 33, just like a target value transmitter 34 via a line 35.
  • the method for controlling this circulating water heater 1 normally works exactly as in the prior art provided for this invention.
  • a shutdown command results. That is, the electromagnet of the first gas valve 29 is de-energized. Since the sticking of the valve body is assumed, the burner 4 remains supplied with gas from the gas line 28, that is to say the flame continues to burn. The ionization detector 31 reports this burning flame to the control or regulating device 15. It is assumed that the control and regulating device 15 does not automatically switch off the circulation pump 21 when the control shutdown command is given.
  • the circulation pump 21 can instead be switched off via a room temperature sensor or can be effected in some other way.
  • the safety temperature limiter which is required anyway, is present with its shutdown mechanism; but is not mentioned here because it does not contribute to the invention. However, he could control both gas valves 27 and 29. This safety shutdown is also locking.

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

Abstract

Control method for a circulating water heater (1) with a sealed combustion chamber (2) and removal by suction of the waste gases supported by a fan (10), the circulating water heater being fed from a gas pipe (28) provided with a valve (27, 29) and monitored by a flame sensor (31), and there being provided a control and regulating device (15) which governs the fan and the gas valve. According to the invention, in the event of non-closure of the gas valve (29) in spite of a corresponding command of the control or regulating device (15), the fan (10) is operated further, when the flame sensor (31) signals a flame. <IMAGE>

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zum Steuern eines Umlaufwasserheizers gemäß dem Oberbegriff des Patentanspruchs.The present invention relates to a method for controlling a circulating water heater according to the preamble of the claim.

Es ist ein Verfahren zum Steuern eines Umlaufwasserheizers bekannt, in dessen Gasleitung zwei Gasventile angeordnet sind. Das erste wird von einer Steuer- und Regeleinrichtung im Proportionalbetrieb betrieben, das zweite wird hydraulisch auch dann offengehalten, wenn eine Pumpe der Zentralheizung einen Differenzdruck erzeugt, der auf einen Wasserdurchsatz im Umlaufwasserheizer schließen läßt. Weiterhin sind ein Flammenionisationsfühler, ein Abgasventilator, eine Differenzdruck-Fühlstelle in der Zuluftleitung, ein Feuerungsautomat, der Teil der Steuer- und Regeleinrichtung ist, und eine Zündeinrichtung für den Brenner vorhanden.A method for controlling a circulating water heater is known, in the gas line of which two gas valves are arranged. The first is operated by a control and regulating device in proportional operation, the second is kept open hydraulically even when a pump of the central heating generates a differential pressure, which indicates a water throughput in the circulating water heater. There is also a flame ionization sensor, an exhaust gas fan, a differential pressure sensor in the supply air line, an automatic burner control, which is part of the control and regulating device, and an ignition device for the burner.

Nach dem bekannten Verfahren wird der Umlaufwasserheizer so betrieben, daß beim Vorliegen eines Einschaltregelbefehls zunächst der Motor der Umwälzpumpe mit Spannung versorgt wird. Die Umwälzpumpe läuft an, und es entsteht aufgrund des Wasserdurchsatzes ein Differenzdruck und damit ein Signal, was zum Öffnen des einen Gasventils führt. Parallel hierzu wird von der Steuer- und Regeleinrichtung der Motor des Abgasventilators mit Spannung beaufschlagt, so daß dieser anläuft. Die dichte Brennkammer des Umlaufwasserheizers wird mit Frischluft gespült, der Durchsatz an Frischluft wird an der Differenzdruck-Fühlstelle im Zuluftweg gemessen und auf die Steuer- und Regeleinrichtung rückgemeldet. Wird ordnungsgemäßer Luftdurchsatz gemeldet, wird die Zündung freigegeben, das heißt, das andere Gasventil erhält auch einen Öffnungsbefehl, so daß die Gasleitung zum Brenner geöffnet ist; zugleich wird der Hauptbrenner gezündet. Nach Ausbildung einer Flamme wird vom Ionisationsfühler das Bestehen dieser Flamme zur Steuer- und Regeleinrichtung zurückgemeldet. Damit liegt ordnungsgemäßer Betrieb des Umlaufwasserheizers vor. Erreicht die Vorlauftemperatur den Soll-Wert, so erfolgt eine Regelabschaltung, das bedeutet, daß eines der beiden Gasventile spannungsfrei wird und schließt. Für den Abgasventilator kann sich eine Nachlaufzeit ergeben, gleichermaßen für die Umwälzpumpe, so daß das andere Gasventil nicht zwangsläufig auch schließen muß.According to the known method, the circulating water heater is operated so that when a switch-on control command is present, the motor of the circulating pump is first supplied with voltage. The circulation pump starts up, and due to the water throughput there is a differential pressure and thus a signal, which leads to the opening of one gas valve leads. In parallel, the control and regulating device applies voltage to the motor of the exhaust gas fan, so that it starts up. The sealed combustion chamber of the circulating water heater is flushed with fresh air, the throughput of fresh air is measured at the differential pressure sensor in the supply air path and reported back to the control and regulating device. If proper air flow is reported, the ignition is released, which means that the other gas valve also receives an opening command so that the gas line to the burner is open; at the same time the main burner is ignited. After a flame has been formed, the existence of this flame is reported back to the control and regulating device by the ionization sensor. This means that the circulation water heater is operating correctly. If the flow temperature reaches the target value, a control shutdown takes place, which means that one of the two gas valves is de-energized and closes. A run-on time can result for the exhaust gas fan, likewise for the circulation pump, so that the other gas valve does not necessarily have to close.

Jetzt kann aber der Fall auftreten, daß das durch die Steuer- oder Regeleinrichtung beaufschlagte Gasventil zwar einen Abschaltbefehl bekommt, aber nicht schließt, wodurch sich ein kritischer Betriebszustand ergeben kann, wenn der Abgasventilator nach Ablauf der eventuell vorhandenen Nachlaufzeit nicht mehr läuft, wohl aber die Umwälzpumpe. Hier ergibt sich zumindest ein sehr unhygienischer Betrieb.Now, however, the case can occur that the gas valve acted upon by the control or regulating device receives a shutdown command but does not close, which can result in a critical operating state if the exhaust gas fan no longer runs after the possibly existing run-on time has elapsed, but it does Circulation pump. At least this results in very unsanitary operation.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, diesen unhygienischen Betrieb zu verhindern.The present invention is therefore based on the object of preventing this unsanitary operation.

Die Lösung der Aufgabe liegt in den kennzeichnenden Merkmalen des Patentanspruchs.The solution to the problem lies in the characterizing features of the claim.

Weitere Ausgestaltungen und besonders vorteilhafte Weiterbildungen der Erfindung ergeben sich aus der nachfolgenden Beschreibung, die ein Ausführungsbeispiel der Erfindung anhand der Figur der Zeichnung näher erläutert.Further refinements and particularly advantageous developments of the invention result from the following description, which explains an embodiment of the invention in more detail with reference to the figure of the drawing.

Ein Umlaufwasserheizer 1 weist eine dichte Brennkammer 2 auf, in der ein Wärmetauscher 3 und ein Gasbrenner 4 angeordnet sind. Die Brennkammer 2 steht über ein konzentrisches Doppelrohr 5 mit der Atmosphäre in Verbindung, wobei ein Ringspalt 6 zwischen einem inneren Rohr 7 und einem äußeren Rohr 8 einen Frischluftweg definiert, während der Abgasweg 9 durch den Querschnitt des Innenrohres gebildet wird, in dem ein Abgasventilator 10 angeordnet ist, der von einem Motor 11 angetrieben wird. Im ringförmigen Zuluftweg 12 ist eine Differenzdruck-Fühlstelle 13 angeordnet, die über eine Meßleitung 14 mit einer Steuer- oder Regeleinrichtung 15 verbunden ist. Der Wärmetauscher 3 steht mit einer Vorlaufleitung 16 in Verbindung, die mit einem Vorlauftemperaturfühler 17 versehen ist, der über eine Meßleitung 18 mit der Steuer- oder Regeleinrichtung 15 verbunden ist. An die Vorlaufleitung 16 ist ein Verbraucher 19 in Gestalt einer Vielzahl in Serie oder parallel geschalteter Heizkörper oder eines Brauchwasserspeichers angeschlossen. Es ist eine Rücklaufleitung 20 zwischen Verbraucher 19 und Wärmetauscher 3 vorgesehen, in die eine Umwälzpumpe 21 eingeschaltet ist, in die ein Antriebsmotor integriert ist, der mit einer elektrischen Versorgungsleitung 22 an die Steuer- oder Regeleinrichtung 15 angeschlossen ist. Vom Pumpenvor- und -rücklaufstutzen führt - nach Art einer Wassermangelsicherung - je eine Druckmeßleitung 23 beziehungsweise 24 zu einem Differenzdruck-Meßgerät 25, was die Druckdifferenz auf eine Stellstange 26 überträgt, die unmittelbar mit einem Ventilkörper eines zweiten Gasventils 27 verbunden ist. Dieses Gasventil 27 liegt im Zuge einer Gasleitung 28, und zwar in Serie mit einem ersten Gasventil 29, das über eine Stelleitung 30 mit der Steuer- oder Regeleinrichtung 15 verbunden ist. Der elektromagnetische Stellmotor für das erste Gasventil 29 ist in dieses Gasventil 29 integriert. Dem Brenner 4 ist ein Ionisationsflammenmelder 31 zugeordnet, der über eine Meßleitung 32 mit der Steuer- oder Regeleinrichtung 15 verbunden ist. Gleichermaßen ist der Antriebsmotor 11 des Ventilators 10 über eine Stelleitung 33 mit der Steuer- oder Regeleinrichtung 15 verbunden, genauso wie ein Soll-Wertgeber 34 über eine Leitung 35. Das Verfahren zum Steuern dieses Umlaufwasserheizers 1 arbeitet im Normalfall exakt so wie beim Stand der Technik zu dieser Erfindung vorausgesetzt.A circulating water heater 1 has a sealed combustion chamber 2, in which a heat exchanger 3 and a gas burner 4 are arranged. The combustion chamber 2 communicates with the atmosphere via a concentric double tube 5, an annular gap 6 between an inner tube 7 and an outer tube 8 defining a fresh air path, while the exhaust gas path 9 is formed by the cross section of the inner tube, in which an exhaust gas fan 10 is arranged, which is driven by a motor 11. A differential pressure sensing point 13 is arranged in the annular supply air path 12 and is connected to a control or regulating device 15 via a measuring line 14. The heat exchanger 3 is connected to a flow line 16 which is provided with a flow temperature sensor 17 which is connected to the control or regulating device 15 via a measuring line 18. A consumer 19 in the form of a plurality of radiators or a domestic hot water tank connected in series or in parallel is connected to the feed line 16. A return line 20 is provided between the consumer 19 and the heat exchanger 3, into which a circulation pump 21 is switched on, into which a drive motor is integrated, which is connected to the control or regulating device 15 with an electrical supply line 22. From the pump supply and return connection leads - after Type of water shortage protection - each a pressure measuring line 23 or 24 to a differential pressure measuring device 25, which transmits the pressure difference to an actuating rod 26 which is connected directly to a valve body of a second gas valve 27. This gas valve 27 lies in the course of a gas line 28, in series with a first gas valve 29, which is connected to the control or regulating device 15 via a control line 30. The electromagnetic servomotor for the first gas valve 29 is integrated in this gas valve 29. An ionization flame detector 31 is assigned to the burner 4 and is connected to the control or regulating device 15 via a measuring line 32. Likewise, the drive motor 11 of the fan 10 is connected to the control or regulating device 15 via a control line 33, just like a target value transmitter 34 via a line 35. The method for controlling this circulating water heater 1 normally works exactly as in the prior art provided for this invention.

Für den Sonderfall des Versagens des ersten Gasventils 29 gilt jedoch folgendes, wobei hier unter Versagen das Hängenbleiben des Ventilkörpers in geöffneter Stellung zu verstehen ist, wenn die Steuer- oder Regeleinrichtung 15 einen Schließbefehl gibt. Dieser Zustand kann nur bei einem Betrieb des Umlaufwasserheizers 1 auftreten. Für den Betrieb gilt aber

  • 1. laufender Ventilator 10,
  • 2. brennender Brenner 4,
  • 3. laufende Umwälzpumpe 21,
  • 4. gefühlte Flamme am Ionisationsmelder 31 und
  • 5. geöffnetes Wassermangelventil, ferner
  • 6. gemessener Luftdurchsatz an der Differenzdruck-Fühlstelle 13.
For the special case of failure of the first gas valve 29, however, the following applies, whereby failure here means the valve body getting stuck in the open position when the control or regulating device 15 issues a closing command. This state can only occur when the circulation water heater 1 is in operation. However, the following applies to the operation
  • 1. running fan 10,
  • 2. burning burner 4,
  • 3. running circulation pump 21,
  • 4. felt flame at the ionization detector 31 and
  • 5. Open water shortage valve, further
  • 6. Measured air flow at the differential pressure sensing point 13.

Erreicht die vom Vorlauftemperaturfühler 17 gemessene Vorlauftemperatur den am Soll-Wertgeber 34 eingestellten Soll-Wert, so resultiert ein Abschaltbefehl. Das heißt, der Elektromagnet des ersten Gasventils 29 wird spannungslos. Da das Hängenbleiben des Ventilkörpers unterstellt wird, bleibt der Brenner 4 weiter aus der Gasleitung 28 mit Gas versorgt, das heißt, die Flamme brennt weiter. Der Ionisationsmelder 31 meldet diese brennende Flamme zur Steuer- oder Regeleinrichtung 15. Es wird unterstellt, daß die Steuer- und Regeleinrichtung 15 beim Regelabschaltbefehl die Umwälzpumpe 21 nicht automatisch abschaltet. Das Abschalten der Umwälzpumpe 21 kann stattdessen über einen Raumtemperaturfühler erfolgen oder anderweitig bewirkt werden. Es ist nämlich häufig sinnvoll, insbesondere bei zentralbeheizten Wohnungen, die Umwälzpumpe 21 weiterlaufen zu lassen und nicht abzuschalten, weil hierdurch eine besonders gute Regelfunktion erreicht wird. Das bedeutet aber, daß das zweite Gasventil 27, welches Bestandteil der Wassermangelsicherung ist, geöffnet bleibt. Nach Ablauf einer gewissen Nachlaufzeit würde nun der Motor 11 des Ventilators 10 stillgesetzt werden, worauf der unhygienische Betrieb einsetzen würde. Die Steuer- oder Regeleinrichtung 15 kann jedoch aus dem Nichtvorliegen eines Weiterbetriebssignals auf der Leitung 30 und dem Vorhandensein eines Flammensignals auf der Leitung 32 darauf schließen, daß eine Betriebsstörung vorliegt, und bewirkt nunmehr ein Abschalten der Umwälzpumpe 21. Das Abschalten der Umwälzpumpe 21 bewirkt ein Wassermangelsignal, was zum Schließen des zweiten Gasventils 27 führt. Damit wäre das Gerät abgeschaltet.If the flow temperature measured by the flow temperature sensor 17 reaches the set value set on the set value transmitter 34, a shutdown command results. That is, the electromagnet of the first gas valve 29 is de-energized. Since the sticking of the valve body is assumed, the burner 4 remains supplied with gas from the gas line 28, that is to say the flame continues to burn. The ionization detector 31 reports this burning flame to the control or regulating device 15. It is assumed that the control and regulating device 15 does not automatically switch off the circulation pump 21 when the control shutdown command is given. The circulation pump 21 can instead be switched off via a room temperature sensor or can be effected in some other way. It is often sensible, in particular in the case of centrally heated apartments, to keep the circulation pump 21 running and not to switch it off because a particularly good control function is thereby achieved. However, this means that the second gas valve 27, which is part of the low water safety device, remains open. After a certain overrun time, the motor 11 of the fan 10 would now be stopped, whereupon the unsanitary operation would start. However, the control or regulating device 15 can conclude from the absence of a continued operation signal on the line 30 and the presence of a flame signal on the line 32 that there is a malfunction, and now causes the circulation pump 21 to be switched off Low water signal, which leads to the closing of the second gas valve 27. The device would then be switched off.

Wird aber der Brenner 4 durch Schließen des zweiten Gasventils 27 zum Erlöschen gebracht, so muß durch interne Mittel dafür gesorgt werden, daß die Umwälzpumpe 21 nicht selbsttätig wieder anlaufen kann. Diese Störabschaltung kann nur von einem Fachmann wieder aufgehoben werden, durch Eingriff in das Gerät selbst.However, if the burner 4 is extinguished by closing the second gas valve 27, internal means must take care of this be that the circulation pump 21 can not restart automatically. This lockout can only be canceled by a specialist by intervening in the device itself.

Es versteht sich von selbst, daß der ohnehin erforderliche Sicherheitstemperatur-Begrenzer mit seinem Abschaltmechanismus vorhanden ist; hier aber nicht erwähnt ist, weil er nichts zur Erfindung beiträgt. Er könnte allerdings beide Gasventile 27 und 29 beherrschen. Diese Sicherheitsabschaltung erfolgt ebenfalls verriegelnd.It goes without saying that the safety temperature limiter, which is required anyway, is present with its shutdown mechanism; but is not mentioned here because it does not contribute to the invention. However, he could control both gas valves 27 and 29. This safety shutdown is also locking.

Claims (1)

  1. A method of controlling heat source comprising a sealed combustion chamber and effecting a fan-assisted combustion, wherein a circulating water heater and a circulating pump are associated with the heat source and the heat source is fed from a gas line, which is controlled by two series-connected gas valves, the heat source is monitored by a flame detector and comprises control or automatic control means, which control the fan, the circulating pump and the first gas valve, whereas the second gas valve is actuated in dependence on the state of operation of the circulating pump, characterized in that the circulating pump is turned off and the second gas valve (27) is thus caused to close when the control or automatic control means (15) deliver a signal representing a command to close the first gas valve whereas the flame detector (31) indicates the continued existence of the flame, and that the second gas valve is held closed.
EP88730028A 1988-02-06 1988-02-06 Control method for a heat source Expired - Lifetime EP0327785B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP88730028A EP0327785B1 (en) 1988-02-06 1988-02-06 Control method for a heat source
AT88730028T ATE99403T1 (en) 1988-02-06 1988-02-06 METHOD OF CONTROLLING A HEAT SOURCE.
DE88730028T DE3886727D1 (en) 1988-02-06 1988-02-06 Method of controlling a heat source.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88730028A EP0327785B1 (en) 1988-02-06 1988-02-06 Control method for a heat source

Publications (2)

Publication Number Publication Date
EP0327785A1 EP0327785A1 (en) 1989-08-16
EP0327785B1 true EP0327785B1 (en) 1993-12-29

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EP88730028A Expired - Lifetime EP0327785B1 (en) 1988-02-06 1988-02-06 Control method for a heat source

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EP2447609B1 (en) * 2010-11-02 2013-09-25 Honeywell Technologies Sarl Method for operating a fan assisted, atmospheric gas burner
DE102019131310A1 (en) * 2019-11-20 2021-05-20 Vaillant Gmbh Heater with emergency control

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US4204833A (en) * 1978-02-06 1980-05-27 Scotty Vent Dampers Safety control for furnace burner
US4211526A (en) * 1978-11-06 1980-07-08 Honeywell Inc. Control system for redundant valves
US4226581A (en) * 1978-12-22 1980-10-07 Honeywell Inc. Safe start check circuit
NL7907138A (en) * 1979-09-26 1981-03-30 Neom Bv Central heating control system - uses electronic logic to control operation of fuel valve, fan and alarm
NL8403840A (en) * 1984-12-18 1986-07-16 Tno Control for gas-fired boiler - uses ionisation detector and programmed logic for highest fuel economy

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ATE99403T1 (en) 1994-01-15
EP0327785A1 (en) 1989-08-16
DE3886727D1 (en) 1994-02-10

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