Gas/air ratio controls for gas burners and gas burning appliances - Part 2: Electronic types

This European Standard specifies the safety, construction and performance requirements for electronic gas/air ratio control systems (GARCs) intended for use with gas burners and gas burning appliances. It also describes the test procedures for evaluating these requirements and specifies information necessary for installation and use.
This standard is only applicable to closed loop gas/air ratio controls (see 3.1) and does not differentiate into classification by heat input.
This standard applies to electronic GARCs that can be tested independently, as well as part of an appliance or a gas burner.

Gas-Luft-Verbundregeleinrichtungen für Gasbrenner und Gasgeräte - Teil 2: Elektronische Ausführung

Diese Europäische Norm legt die Anforderungen an die Sicherheitstechnik, die Konstruktion und die Ausführung für elektronische Gas-Luft-Verbundregeleinrichtungen (GARC) fest, die für den Gebrauch mit Gasbrennern und Gasgeräten bzw. -anlagen bestimmt sind. Außerdem werden die Prüfverfahren zur Bewertung dieser Anforderungen sowie die für Installation und Gebrauch notwendigen Informationen festgelegt.
Diese Norm gilt nur für geschlossene Gas-Luft-Verbundregelkreise (siehe 3.1) und unterscheidet nicht hinsichtlich Wärmeleistungsklassen.
Die vorliegende Norm gilt für elektronische GARC, die für sich alleine, aber auch als Teil eines Gerätes bzw. einer Anlage oder eines Gasbrenners geprüft werden können.

Dispositifs de régulation du rapport air/gaz pour brûleurs à gaz et appareils à gaz - Partie 2: Dispositifs électroniques

La présente norme précise les spécifications minimales de sécurité, de construction et de fonctionnement des dispositifs électroniques de régulation du rapport air/gaz destinés à équiper des brûleurs à gaz et des appareils à gaz. Elle décrit aussi les modes opératoires d'essai permettant de vérifier la conformité à ces exigences ainsi que les informations nécessaires à l'installation et à l'utilisation.
La présente norme s'applique uniquement aux dispositifs de régulation du rapport air/gaz à boucle fermée (voir 3.1) et ne présente pas de classification par débit calorifique.
La présente norme s'applique aux dispositifs électroniques du rapport air/gaz qui peuvent être soumis à essai séparément, comme faisant partie d'un appareil ou d'un brûleur à gaz.

Regulatorji razmerja plina in zraka za plinske gorilnike in plinske aparate - 2. del: Elektronski tip

General Information

Status
Published
Publication Date
23-Mar-2004
Current Stage
9093 - Decision to confirm - Review Enquiry
Completion Date
12-Jan-2009

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gas/air ratio controls for gas burners and gas burning appliances - Part 2: Electronic typesRegulatorji razmerja plina in zraka za plinske gorilnike in plinske aparate - 2. del: Elektronski tipDispositifs de régulation du rapport air/gaz pour bruleurs a gaz et appareils a gaz - Partie 2: Dispositifs électroniquesGas-Luft-Verbundregeleinrichtungen für Gasbrenner und Gasgeräte - Teil 2: Elektronische AusführungTa slovenski standard je istoveten z:EN 12067-2:2004SIST EN 12067-2:2004en,fr,de27.060.2023.060.40ICS:SLOVENSKI

STANDARDSIST EN 12067-2:200401-junij-2004

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12067-2March 2004ICS 23.060.40; 27.060.20English versionGas/air ratio controls for gas burners and gas burningappliances - Part 2: Electronic typesDispositifs de régulation du rapport air/gaz pour brûleurs àgaz et appareils à gaz - Partie 2: Dispositifs électroniquesGas-Luft-Verbundregeleinrichtungen für Gasbrenner undGasgeräte - Teil 2: Elektronische AusführungThis European Standard was approved by CEN on 2 February 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12067-2:2004: E

EN 12067-2:2004 (E)2Contents

pageForeword...........................................................................................................................................................4Introduction......................................................................................................................................................51Scope..................................................................................................................................................62Normative references........................................................................................................................63Terms and definitions.......................................................................................................................63.1electronic gas/air ratio control (electronic GARC)...............................................................................63.2electronic control box (ECB)................................................................................................................73.3actuator................................................................................................................................................73.4sensor..................................................................................................................................................73.5combustion process.............................................................................................................................73.6defined safe state................................................................................................................................73.7fault tolerating time..............................................................................................................................83.8safety shut-down.................................................................................................................................83.9lock-out................................................................................................................................................83.9.1non-volatile lock-out.............................................................................................................................83.9.2volatile lock-out....................................................................................................................................83.10abnormal operation..............................................................................................................................83.11form closure construction....................................................................................................................84Classification.....................................................................................................................................95Units of measurement and test conditions.....................................................................................96Construction requirements..............................................................................................................96.1General................................................................................................................................................96.2Mechanical requirements....................................................................................................................96.2.1General................................................................................................................................................96.2.2Special requirements for electromechanical actuators with position feed-back sensors..................106.3Electrical equipment..........................................................................................................................106.3.1General..............................................................................................................................................106.3.2Class of protection.............................................................................................................................106.3.3Electronics and software...................................................................................................................107Functional requirements.................................................................................................................107.1General..............................................................................................................................................107.2Burner control interface.....................................................................................................................117.3Safety shut-down initiated by the electronic GARC...........................................................................117.4Start-up sequence.............................................................................................................................117.5Preset/predefined range....................................................................................................................117.6Restart from defined safe state.........................................................................................................117.7Accuracy requirements......................................................................................................................117.7.1General..............................................................................................................................................117.7.2Sensor(s) and actuators....................................................................................................................127.7.3Repeatability......................................................................................................................................127.8Protection against internal faults.......................................................................................................127.8.1Failure modes of components...........................................................................................................127.8.2Safety class.......................................................................................................................................127.9Information to be supplied by the manufacturer................................................................................127.10Documentation..................................................................................................................................137.11Assessment.......................................................................................................................................138Protection against environmental influences...............................................................................138.1General..............................................................................................................................................13

EN 12067-2:2004 (E)38.2Test conditions..................................................................................................................................138.3Performance tests.............................................................................................................................148.3.1At ambient temperature.....................................................................................................................148.3.2At low temperature............................................................................................................................148.3.3At high temperature...........................................................................................................................148.4Void....................................................................................................................................................148.5Endurance.........................................................................................................................................148.5.1General..............................................................................................................................................148.5.2Vibration test......................................................................................................................................158.5.3Humidity.............................................................................................................................................158.6EMC-requirements............................................................................................................................158.6.1General..............................................................................................................................................158.6.2Supply voltage variations...................................................................................................................158.6.3Supply voltage interruptions or decreases........................................................................................158.6.4Supply frequency variations..............................................................................................................168.6.5Surge immunity..................................................................................................................................168.6.6Electrical fast transient burst.............................................................................................................168.6.7Electromagnetic conducted and radiated disturbances induced by radio-frequencyfields..................................................................................................................................................168.6.8Electrostatic discharge immunity.......................................................................................................169Marking and installation.................................................................................................................169.1Marking..............................................................................................................................................169.2Installation and operating instructions...............................................................................................169.3Warning note.....................................................................................................................................17Annex A (informative)

Approval path for the electronic GARC.................................................................18Annex B (normative)

Manufacturer's declaration for sensors, actuators and repeatability..................19Annex C (normative)

Special requirements for single position feed-back potentiometers inelectromechanical actuators........................................................................................................................23Annex ZA (informative)

Clauses of this European Standard addressing essentialrequirements or other provisions of EU Directives....................................................................................24

EN 12067-2:2004 (E)4ForewordThis document (EN 12067-2:2004) has been prepared by Technical Committee CEN /TC 58, "Safety andcontrol devices for gas-burners and gas-burning appliances", the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by September 2004, and conflicting national standards shall bewithdrawn at the latest by September 2004.This document has been prepared under a mandate given to CEN by the European Commission and theEuropean Free Trade Association, and supports essential requirements of EU Directive(s).For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.This European Standard covers type testing only.This standard recognizes the safety level specified by CEN/TC 58 dealing with the safety, construction andperformance of controls for Gas Burners and Gas Burning Appliances and to their testing.Annex A is informative. Annexes B and C are normative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerlandand United Kingdom.

EN 12067-2:2004 (E)5IntroductionFor electronic gas/air ratio control systems (GARC) there are numerous solutions for specific applications inthe market. For that reason TC 58 decided to draft a standard for type testing for closed loop electronicGARC only.This standard does not override requirements of relevant appliance standards.This standard does not differentiate into classification by heat input or relates to applications. When GARCsare fitted to appliances the safety of the appliance should not be reduced by any normal or abnormaloperation of the GARC described in this standard.The accuracy of actual gas/air ratio is not specified as a fixed value in this standard.The standard specifies which parameters have to be declared by the manufacturer and under whatconditions these have to be fulfilled. These parameters will relate to the GARC rather than the combustionprocess.The standard does not include a standard test rig, however the purpose of the tests is to verify themanufacturer’s declaration under the conditions required in the standard.

EN 12067-2:2004 (E)61 ScopeThis European Standard specifies the safety, construction and performance requirements for electronicgas/air ratio control systems (GARCs) intended for use with gas burners and gas burning appliances. It alsodescribes the test procedures for evaluating these requirements and specifies information necessary forinstallation and use.This standard is only applicable to closed loop gas/air ratio controls (see 3.1) and does not differentiate intoclassification by heat input.This standard applies to electronic GARCs that can be tested independently, as well as part of an applianceor a gas burner.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications.These normative references are cited at the appropriate places in the text, and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publications applyto this European Standard only when incorporated in it by amendment or revision. For undated referencesthe latest edition of the publication referred to applies (including amendments).EN 298:2003; Automatic gas burner control systems for gas burners and gas burning appliances with orwithout fans.EN 13611:2000, Safety and control devices for gas burners and gas-burning appliances - Generalrequirements.ENV 14459:2002, Method of risk analysis and recommendations for the use of electronics in systems for thecontrol of gas burners and gas burning appliances.EN 60068-2-6:1995, Environmental testing - Part 2: Tests – Tests Fc: Vibration (sinusoidal) (IEC 60068-2-6:1995 + Corrigendum 1995).EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989).EN 60730-1:2000, Automatic electrical controls for household and similar use — Part 1: Generalrequirements (IEC 60730-1:1999, modified).EN 60730-2-5, Automatic electrical controls for household and similar use - Part 2-5: Particular requirementsfor automatic electrical burner control systems (IEC 60730-2-5:2000, modified).EN 61000-4-11, Electromagnetic compatibility (EMC) — Part 4: Testing and measurement techniques —Section 11: Voltage dips, short interruptions and voltage variations immunity tests (IEC 61000-4-11:1994).3 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1 electronic gas/air ratio control (electronic GARC)closed loop modulating system consisting of the electronic control, actuating elements for the gas flow andthe air flow as a minimum, and allocated feedback signal(s), see Figure 1

EN 12067-2:2004 (E)7Figure 1 — Scope of the electronic GARC3.2 electronic control box (ECB)electronic main control module incorporating all inputs and outputs for the controlling elements3.3 actuatordevice for controlling the amount of gas and/or air3.4 sensordevice which gives a signal related to a physical property to which it responds3.5 combustion processchemical reaction between gas and air to produce heat3.6 defined safe statestate of the system with the following characteristics:a) the system passively assumes a state in which the output terminals ensure a safe situation under allcircumstances or;b) the system actively executes a protective action causing it to shut down and lock out, or;c) the system remains in operation, continuing to satisfy all safety related functional requirements

EN 12067-2:2004 (E)83.7 fault tolerating timetime between the occurrence of a fault and the shut down of the burner, which is tolerated by the applicationwithout creating a hazardous situation (Figure 2)Fault tolerating time<---------------------------------------------------------------------------------------------------------------->Fault detection timeFault reaction time<----------------------------------------------------><-------------------------------------------------------->Fault occurs

Fault flagged

Shut downI------------------------------------------------------I----------------------------------------------------------IFigure 2 — Fault tolerating time3.8 safety shut-downprocess which is effected immediately following the response of a protection device or the detection of a faultin the electronic GARC and places the burner out of operation; the resulting state of the system is defined bydeactivated terminals for the gas shut-off valves and the ignition device [definition 3.17 of EN 298:2003]3.9 lock-out3.9.1 non-volatile lock-outsafety shut-down condition of the system, such that a restart can only be accomplished by a manual reset ofthe system and by no other means [definition 3.18.1 of EN 298:2003]3.9.2 volatile lock-outsafety shut-down condition of the system, such that a restart can only be accomplished by either a manualreset of the system or an interruption of the mains power and its subsequent restoration [definition 3.18.2 ofEN 298:2003]3.10abnormal operationoperation of the appliance under the effect of internal failures or under the effect of foreseeable influencesoutside the specified operational conditions [definition 3.19 of ENV 14459:2002]3.11form closure constructionconstruction ensuring non-slippage

EN 12067-2:2004 (E)94 ClassificationThere are no classifications used in this standard.5 Units of measurement and test conditionsAccording to EN 13611:2000; clause 5.6 Construction requirements6.1 GeneralThe GARC shall consist of at least two actuators and sensors (see Figure 1 and Table 1 which shall beconsidered together). It shall have continuous self-che

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