Automatic burner control systems for burners and appliances burning gaseous or liquid fuels

This European Standard specifies the safety, construction and performance requirements for automatic burner control systems, programming units and flame detector devices, intended for use with gas and oil burners and gas and oil burning appliances, with or without fans and similar use. This European Standard is applicable to automatic burner control systems that include additional functions. This European Standard does not cover automatic burner control systems utilizing thermo-electric flame supervision devices.

Feuerungsautomaten für Brenner und Brennstoffgeräte für gasförmige oder flüssige Brennstoffe

Dieses Dokument legt Anforderungen an den Bau und die Funktion, an Prüfverfahren und die Kennzeichnung
von Feuerungsautomaten, an Steuergeräte sowie Flammenwächter für Gas- und Ölbrenner sowie Gas- und
Ölgeräte mit oder ohne Gebläse fest.
Dieses Dokument gilt auch für Feuerungsautomaten, Steuergeräte und die ihnen zugehörigen Flammenwächter,
die zusätzliche Funktionen enthalten.
Feuerungsautomaten, die thermoelektrische Flammenüberwachungseinrichtungen verwenden, sind nicht
Gegenstand dieser Norm.
In dieser Norm wird nur die Typprüfung behandelt.
ANMERKUNG Europäische Normen für Brenner, Geräte oder Prozesse, die Feuerungsautomaten, Steuergeräte oder
Flammenwächter verwenden, können Vorrang vor den Anforderungen der vorliegenden Norm haben.

Systèmes automatiques de commande pour brûleurs et appareils utilisant des combustibles gazeux ou liquides

Le présent document a pour objet de fixer les exigences concernant les caractéristiques de construction et de fonctionnement, la technique des essais et le marquage des systèmes automatiques de commande des brûleurs, les unités de programmation ainsi que les dispositifs de détection de flamme pour les brûleurs et les appareils à gaz et à fioul, avec ou sans ventilateur.
Le présent document s'applique également aux systèmes automatiques de commande des brûleurs, aux unités de programmation ou aux dispositifs de détection de flamme associés comportant des fonctions supplémentaires.
La présente norme ne concerne pas les systèmes automatiques de commande des brûleurs utilisant des dispositifs de détection de flamme thermoélectriques.
Le présent document traite uniquement des essais de type.
NOTE   Les normes européennes particulières pour brûleurs, appareils ou processus qui mettent en œuvre des systèmes automatiques de commande des brûleurs, des unités de programmation ou des dispositifs de détection de flamme, peuvent être considérées comme prioritaires par rapport à la présente norme.

Naprave za samodejni nadzor gorilnikov in aparatov na plin ali tekoča goriva

Ta evropski standard določa zahteve v zvezi z varnostjo, izdelavo in lastnostmi za naprave za samodejni nadzor, enote za programiranje in naprave za zaznavanje plamena, namenjene uporabi s plinskimi in oljnimi gorilniki ter aparati na plin in olje, z ali brez ventilatorjev, in za podobne namene. Ta evropski standard se uporablja za naprave za samodejni nadzor gorilnikov z dodatnimi funkcijami. Ta evropski standard ne zajema naprav za samodejni nadzor gorilnikov z uporabo termoelektričnih naprav za nadziranje plamena.

General Information

Status
Published
Public Enquiry End Date
31-Aug-2010
Publication Date
15-Aug-2012
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
08-Aug-2012
Due Date
13-Oct-2012
Completion Date
16-Aug-2012

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Feuerungsautomaten für Brenner und Brennstoffgeräte für gasförmige oder flüssige BrennstoffeSystèmes automatiques de commande pour brûleurs et appareils utilisant des combustibles gazeux ou liquidesAutomatic burner control systems for burners and appliances burning gaseous or liquid fuels27.060.20Plinski gorilnikiGas fuel burners27.060.10JRULYRLiquid and solid fuel burnersICS:Ta slovenski standard je istoveten z:EN 298:2012SIST EN 298:2012en,fr,de01-september-2012SIST EN 298:2012SLOVENSKI

STANDARDSIST EN 298:2004SIST EN 230:20061DGRPHãþD
SIST EN 298:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 298
May 2012 ICS 27.060.01 English Version

Automatic burner control systems for burners and appliances burning gaseous or liquid fuels

Systèmes automatiques de commande pour brûleurs et appareils utilisant des combustibles gazeux ou liquides

Feuerungsautomaten für Brenner und Brennstoffgeräte für gasförmige oder flüssige Brennstoffe This European Standard was approved by CEN on 9 March 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 298:2012: ESIST EN 298:2012

EN 298:2012 (E) 2 Contents Page Foreword ..............................................................................................................................................................41Scope ......................................................................................................................................................62Normative references ............................................................................................................................63Terms and definitions ...........................................................................................................................74Classification ....................................................................................................................................... 135Units of measurement and test condition ........................................................................................ 136Constructional requirements ............................................................................................................. 147Performance ........................................................................................................................................ 188EMC/Electrical requirements ............................................................................................................. 309Marking, installation and operating instructions ............................................................................ 34Annex A (informative)

Gas connections in common use in the various countries ................................. 38Annex B (informative)

Leak-tightness test − Volumetric method .............................................................. 39Annex C (informative)

Leak-tightness − Pressure loss method ................................................................ 40Annex D (normative)

Conversion of pressure loss into leakage rate ....................................................... 41Annex E (normative)

Electrical/electronic component fault modes .......................................................... 42Annex F (normative)

Additional requirements for safety accessories and pressure accessories as defined in EU 97/23/EC .................................................................................................................. 44Annex G (normative)

Materials for pressurized parts ................................................................................. 45Annex H (informative)

Additional materials for pressurized parts ............................................................ 46Annex I (normative)

Requirements for controls used in DC supplied fuel burners and fuel burning appliances ............................................................................................................................. 47Annex AA (informative)

Functional characteristics of burner control systems, to be given by the appliance standard ............................................................................................................................. 49Annex BB (informative)

Fault modes of flame sensors .............................................................................. 50Annex CC (informative)

Functional diagrams of oil burner control systems ........................................... 52Annex ZA (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 2009/142/EC relating to appliances burning gaseous fuels ....... 57Bibliography ..................................................................................................................................................... 59 SIST EN 298:2012

EN 298:2012 (E) 3 Figures

Figure 1 — Basic functional chain of a typical flame supervision ........................................................................ 7Figure 2 — Basic functional chain of an independent flame detector device ...................................................... 8Figure 3 — Flame sensors for visible light ......................................................................................................... 28Figure 4 — Acoustic flame sensor...................................................................................................................... 29Figure CC.1 — Burner without pilot .................................................................................................................... 54Figure CC.2 — Burners with pilot which operates only during the ignition time ................................................ 55Figure CC.3 — Ignition restoration after loss of sensed flame during running position ..................................... 55Figure CC.4 — Recycling after loss of sensed flame during running position ................................................... 56Figure CC.5 — Lock-out after loss of sensed flame during running position ..................................................... 56Figure CC.6 — Lock-out for the non-establishment of the flame signal (during safety time t5) ......................... 56 Tables

Table E.1 — Electrical/electronic component faults modes ............................................................................... 42Table AA.1 — Functional characteristics of gas burner control systems, to be given by the appliance standard ..................................................................................................................................................................... 49Table AA.2 — Functional characteristics of oil burner control systems, to be given by the appliance standard ..................................................................................................................................................................... 49Table BB.1 — Fault modes of flame sensors ..................................................................................................... 50Table CC.1 — Symbols ...................................................................................................................................... 52Table ZA.1 — Correspondence between this European Standard and Directive 2009/142/EC relating to appliances burning gaseous fuels ............................................................................................................... 57 SIST EN 298:2012

EN 298:2012 (E) 4 Foreword This document (EN 298:2012) has been prepared by Technical Committee CEN/TC 58 “Safety and control devices for burners and appliances burning gaseous or liquid fuels”, 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 identical text or by endorsement, at the latest by November 2012, and conflicting national standards shall be withdrawn at the latest by May 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For the relationship of this document with EU Directive(s), see informative Annex ZA, which is an integral part of this document. This document supersedes EN 230:2005 and EN 298:2003. This document refers to clauses of EN 13611:2007+A2:2011 and adapts them, indicating the changes by stating "with the following modification", "with the following addition", "is replaced by the following" or "is not applicable". It also adds clauses or sub-clauses to the structure of EN 13611:2007+A2:2011 which are particular to this standard (EN 298:2012). Additional sub-clauses or annexes are either numbered starting from 101 or are designated as Annex AA, BB, CC etc. It should be noted however that these clauses and sub-clauses are not indicated as additions in the text. The following is a list of significant technical changes between this document and the previous editions:

 Alignment with EN 13611:2007+A2:2011;  Integration of the requirements from EN 230 (EN 230 is merged into prEN 298); NOTE

If, due to the reference of EN 13611 the term “gas” will be part of a requirement or test, then the term “gas” shall be substituted by the term “fuel”

 Requirements from the flame supervision and the reactions in case of loss of flame have been adapted to modifications made in EN 267 and EN 676 and optimised for better understanding;  Requirements and tests for “independent flame detectors” have been integrated;  New requirements concerning “common cause” have been added;  Requirements for the new function “remote reset from lock-out” have been added. EN 298 compliance for burner control systems or flame detector devices cannot be claimed based upon SIL classification according to EN 61508. SIL classification cannot be claimed based upon compliance with this standard only. A supplementary method for SIL determination is specified in EN 13611:2007+A2:2011, Annex J. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, SIST EN 298:2012

EN 298:2012 (E) 5 Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 298:2012

EN 298:2012 (E) 6 1 Scope This European Standard specifies the safety, construction and performance requirements for automatic burner control systems, programming units and flame detector devices, intended for use with gas and oil burners and gas and oil burning appliances, with or without fans and similar use. This European Standard is applicable to automatic burner control systems that include additional functions. This European Standard does not cover automatic burner control systems utilizing thermo-electric flame supervision devices. NOTE 1 European Standards for burners, appliances or processes which use automatic burner control systems, programming units or flame detectors can override the requirements of this standard. NOTE 2 Provisions for production control are not part of this European Standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 267:2009+A1:2011, Automatic forced draught burners for liquid fuels EN 1643, Valve proving systems for automatic shut-off valves for gas burners and gas appliances EN 13611:2007+A2:2011, Safety and control devices for gas burners and gas burning appliances — General requirements

EN 14459:2007, Control functions in electronic systems for gas burners and gas burning appliances — Methods for classification and assessment EN 60730-1:2011, Automatic electrical controls for household and similar use — Part 1: General requirements (IEC 60730-1:2010 (modified)) EN 60730-2-5:2002+A1:2004+A11:2005+A2:2010, Automatic electrical controls for household and similar use — Part 2-5: Particular requirements for automatic electrical burner control systems (IEC 60730-2-5:2000+Am1:2004+Am2:2008, (modified)) EN 60947-5-1:2004, Low-voltage switchgear and controlgear — Part 5-1: Control circuit devices and switching elements — Electromechanical control circuit devices (IEC 60947-5-1:2003)

IEV 191, International Electrotechnical Vocabulary — Chapter 191: Dependability and quality of service (Consolidated version included Amendment 1 and Amendment 2); Identical with IEC 60050-191:1990-12 (Consolidated with IEC 60050-191/A1:1993-03 and IEC 60050-191/A2:2002-01) SIST EN 298:2012

EN 298:2012 (E) 7 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13611:2007+A2:2011 and the following apply. 3.101 flame detector device device by which the presence of a flame is detected and signalled (see Figure 1) Note 1 to entry: Flame detector devices can consist of a flame sensor, an amplifier and a relay for signal transmission. These parts, with the possible exception of the actual flame sensor, can be assembled in a single housing for use in conjunction with a programming unit.

Key 1 automatic burner control system (see 3.110) 2 flame detector device (see 3.101) 3 flame 4 flame sensor (see 3.103) 5 amplifier 6 filter 7 threshold 8 programming unit (see 3.109) 9 shut-off valve (see 3.104) 10 shut-off valve terminal 11 flame signal (see 3.107) 12 flame failure response time (see 3.105.1) 13 sensed flame (see 3.106) Figure 1 — Basic functional chain of a typical flame supervision

3.102 independent flame detector device flame detector device which operates independent of the programming unit to provide the class C control function (see Figure 2) Note 1 to entry: Self-checking functions are incorporated in this type of flame detector device. SIST EN 298:2012

EN 298:2012 (E) 8

Key 1 independent flame detector device (see 3.102) 2 flame 3 flame sensor (see 3.103) 4 amplifier 5 filter 6 threshold 7 flame signal (see 3.107) 8 flame failure detection time (see 3.105.2) 9 sensed flame (see 3.106) Figure 2 — Basic functional chain of an independent flame detector device 3.103 flame sensor device which reacts to the presence of the flame by providing an output signal that is used for further signal processing 3.104 shut-off valve

safety device which releases the fuel flow when energized and stops the fuel flow automatically when de-energized

Note 1 to entry: For further information refer to EN 161 or EN 126 for gas and EN ISO 23553-1 for oil, or to other similar devices if mentioned in the relevant appliance standard. 3.105 time in case of flame failure

3.105.1 flame failure response time

FFRT response time between the loss of a sensed flame and the resulting de-energizing of the shut-off valve terminals

Note 1 to entry: FFRT may be referred to as “extinction safety time” in appliance standards.

3.105.2 flame failure detection time FFDT response time of an independent flame detector device between the loss of a sensed flame and the flame signal indicating the absence of a flame

3.106 sensed flame physical value monitored by the flame sensor 3.107 flame signal signal given by the flame detector device in case of sensed flame SIST EN 298:2012

EN 298:2012 (E) 9 3.108 flame simulation condition which occurs when the flame signal indicates the presence of a flame when in reality no flame is present 3.109 programming unit unit which executes the program, reacts to signals from control and safety devices, gives the control commands, controls the start-up sequence, supervises the burner operation and causes controlled shut-down, and if necessary, safety-shut-down and lock-out Note 1 to entry: The programming unit follows a predetermined sequence of actions and always operates in conjunction with a flame detector device. 3.110 automatic burner control system system comprising at least a programming unit and all the elements of a flame detector device

Note 1 to entry: The various functions of an automatic burner control system can be in one or more housings. 3.111 start position stage where the system is not in lock-out position and has not yet received the start signal but can proceed with the start-up sequence when required Note 1 to entry: At this stage, the output terminals for any shut-off valve and ignition device are not energized. 3.112 start signal signal (e.g. from a thermostat) which releases the system from its start position and commences the predetermined program 3.113 purge forced introduction of air through the combustion chamber and flue passages in order to displace any remaining fuel/air mixture and/or products of combustion 3.114 pre-purge purge which takes place between the start signal and the energization of the shut-off valve or, in the case of gas, the energization of the ignition device, if this comes first 3.115 post-purge purge which takes place immediately following shut-down 3.116 first safety time interval between the pilot shut-off valve, the start shut-off valve or the main shut-off valve, as applicable, being energized and the pilot shut-off valve, start shut-off valve or the main shut-off valve, as applicable, being de-energized if no flame signal is present Note 1 to entry: Where there is no second safety time, this is called the safety time. 3.117 second safety time where there is a first safety time applicable to either a pilot or start fuel flame only, the second safety time is the interval between the main shut-off valve being energized and the main shut-off valve being de-energized if no main flame signal is present SIST EN 298:2012

EN 298:2012 (E) 10 3.118 running position

position of the system in which the burner is in normal operation under the supervision of the programming unit and its flame detector device 3.119 controlled shut-down process by which the power to the shut-off valve(s) is removed before any other action takes place as a result of the action of a controlling function 3.120 safety-shut-down process which is effected immediately following the response of a protection device or the detection of a fault in the automatic burner control system and puts the burner out of operation Note 1 to entry: The resulting state of the system is defined by deactivated terminals for the shut-off valves and the ignition device. 3.121 lock-out

Note 1 to entry: Lock-out can mean non-volatile lock-out or volatile lock-out. 3.121.1 non-volatile lock-out safety-shut-down condition of the system, where a restart can only be accomplished by the manual reset of the system and by no other means 3.121.2 volatile lock-out safety-shut-down condition of the system, where a restart can only be accomplished by either the manual reset of the system, or an interruption of the main power and its subsequent restoration 3.122 Ignition restoration spark restoration process by which, following loss of flame signal, the ignition device is switched on again without total interruption of the fuel supply 3.123 recycling process by which, after a safety-shut-down, a full start-up sequence is automatically repeated 3.124 timings

3.124.1 waiting time for burners without fans, interval between the start signal being given and the energization of the ignition device or shut-off valves, whichever comes first Note 1 to entry: During this time natural ventilation of the combustion chamber and the flue passages can take place. 3.124.2 waiting time interval between the start signal being given (and air registers in purge position, if applicable) and the energization of the ignition device SIST EN 298:2012

EN 298:2012 (E) 11 Note 1 to entry: During this time natural ventilation of the combustion chamber and the flue passages takes place. 3.124.3 pre-purge time period during which purging takes place at the proven air rate prior to the energization of the ignition device or shut-off valves, whichever comes first 3.124.4 pre-purge time period preceding the signal to open the shut-off valve during which the combustion chamber is compulsorily ventilated 3.124.5 post-purge time period during which purging takes place at the proven air rate between any shut-down and the moment the fan is switched off 3.124.6 post-purge time period following the signal to close the shut-off valve during which the combustion chamber is compulsorily ventilated 3.124.7 inter-purge time period during which purging of the combustion chamber takes place at the proven air rate after unsuccessful ignition and prior to the next recycle attempt 3.124.8 inter-waiting time period during which natural ventilation of the combustion chamber takes place after unsuccessful ignition and prior to the next recycle attempt 3.125 sequences

3.125.1 start-up sequence sequence of actions executed by the system which brings the burner from the start position to the running position 3.125.2 first stage part of the start-up sequence which allows the release of start fuel into the combustion chamber 3.125.3 second stage part of the start-up sequence which allows the release of further fuel into the combustion chamber

3.126

system for permanent operation system that is designed to remain in the running position for longer than 24 h without interruption 3.127 system for non-permanent operation system that is designed to remain in the running position for less than 24 h SIST EN 298:2012

EN 298:2012 (E) 12 3.128 self-checking function of the flame detector device automatic internal function of the system which checks the operation of the flame detector device 3.129 air flow simulation condition which occurs when the air flow sensor indicates the presence of air flow when in reality no air flow is present 3.130 spark supervision process of monitoring the ignition spark 3.131 pilot or start fuel flame proving period interval between the end of the first safety time and the beginning of the second safety time which is used to prove that the pilot or start fuel flame is stable 3.132 intermittent first stage first stage that is ignited prior to ignition of the main flame and is shut off simultaneously with the main flame 3.133 interrupted first stage

first stage that is ignited each time the burner is started up and which is extinguished at the end of the second safety time 3.134 burner ignition systems

3.134.1 ignition by supervised gas-fired pilot burner system which releases the main fuel when the ignition burner flame is present 3.134.2 ignition by non-supervised gas-fired pilot burner system in which the release of the main fuel is not prevented by the absence of the flame of the pilot burner 3.135 ignition timings

3.135.1 total ignition time period during which the ignition device is energized

Note 1 to entry: This time includes pre-ignition, ignition and post-ignition times.

3.135.2 pre-ignition time period between the energization of the ignition device and the start of the safety time 3.135.3 ignition time period between the start of the safety time and the first detection of a flame signal Note 1 to entry: The maximum ignition time ends prior to or simultaneous with the safety time when no flame signal has been detected. SIST EN 298:2012

EN 298:2012 (E) 13 3.135.4 post-ignition time period between the first detection of the flame signal and the de-energization of the ignition device 3.136 maximum throughput

mass of oil consumed during one hour at the highest throughput stated by the manufacturer Note 1 to entry: Maximum throughput is expressed in kilograms per hour (kg/h). [SOURCE: EN 267:2009+A1:2011, 3.2.1.1] 3.137 common cause failures failures of different items, resulting from a single event, where these failures are not consequences of each other

Note 1 to entry: Common cause failures should not be confused with common mode failures. [SOURCE: IEV 191-04-23] 4 Classification 4.1 Classes of control Classification is not given for burner control systems or for flame detector devices. 4.2 Groups of control EN 13611:2007+A2:2011, 4.2 is not applicable. 4.3 Classes of control functions Shall be according to EN 13611:2007+A2:2011, 4.3 with the following addition:  The burner control system is a class C control function;  The flame detector device, if independent from the programming unit, is a class C control function. 5 Units of measurement and test conditions 5.1 Dimensions Shall be according to EN 13611:2007+A2:2011, 5.1. 5.2 Pressures Shall be according to EN 13611:2007+A2:2011, 5.2. 5.3 Bending moments and torques EN 13611:2007+A2:2011, 5.3 is not applicable. 5.4 Test conditions and measurement tolerances Shall be according to EN 13611:2007+A2:2011, 5.4 with the following modifications: SIST EN 298:2012

EN 298:2012 (E) 14 Replace the first 4 paragraphs by the following: Where possible those tests already covered by EN 60730-2-5 shall be combined. Add the following paragraph at the end of the clause: All tests are performed in the order written in this European Standard (i.e. EN 298) except for that of 7.10 and 6.6. 6 Constructional requirements

6.1 General EN 13611:2007+A2:2011, 6.1 is not applicable. 6.2
Mechanical parts of the control

EN 13611:2007+A2:2011, 6.2 is not applicable. 6.3 Materials EN 13611:2007+A2:2011, 6.3 is not applicable. 6.4 Gas connections EN 13611:2007+A2:2011, 6.4 is not applicable. 6.5 Electronic parts of the control 6.5.1 General Shall be according to EN 13611:2007+A2:2011, 6.5.1 with the following addition: NOTE 1 The requirement to include at least two operating elements does not apply to flame detector devices which are not intended to energize shut-off valves directly. The requirement for two independent operating elements can be replaced by a requirement for one operating element for each shut-off valve (two operating elements in total), under the following conditions which guarantee the same overall safety level:

 an integrated solution consisting of a Burner control function and a Valve Proving System according to EN 1643 and

 the valve proving system checking the leakage during each burner cycle.

NOTE 2 The above requirement does not supersede the other requirements of this document e.g. fault assessment. The construction of any additional functions included in the automatic burner control system, programming unit or flame detector device for which no provisions exist in this standard, shall be such that they do not degrade the safe and correct operation of the automatic burner control system, programming unit or flame detector device. Measures shall be taken to protect against the failure of two (or more) switching elements, due to a common cause, by an external short-circuit that would prevent the burner control system from performing a safety shutdown.

Acceptable methods are current limitation, overcurrent protection device or internal fault detecting functions. SIST EN 298:2012

EN 298:2012 (E) 15 The suitability of measures to maintain the capability to interrupt the energization of the shut-off valve terminals by means of at least one switching element, or by interrupting a non-replaceable overcurrent protection device, shall be verified by the following test. The shut-off valve terminals of the burner control system are connected to a switch that is intended to switch the short-circuit current. With this switch opened, the burner control system is connected as described in EN 60730-1:2011, H.27.1.1.2 with the outputs energized to simulate normal operation (with the contacts of the internal switching elements closed). Where overcurrent protection devices are used as the protective measure, the power supply to the burner control system shall have the capability of supplying an inrush current of at least 500 A. When current limitation techniques are used, the power supply to the burner control system shall not limit the current. A short-circuit is applied between the shut-off valve terminals of the burner control system by closing the switch. The test is terminated if there is no current flow through the switch, or after one hour. If an overcurrent protection device is repl

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