BS EN 14459-2015 Safety and control devices for burners and appliances burning gaseous or liquid fuels Control functions in electronic systems Methods for classification and assess.pdf

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1、BSI Standards PublicationBS EN 14459:2015Safety and control devicesfor burners and appliancesburning gaseous or liquidfuels Control functionsin electronic systems Methods for classification andassessmentBS EN 14459:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation

2、of EN 14459:2015.It supersedes BS EN 14459:2007 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee GSE/22, Safety and control devices for gas and oilburners and gas burning appliances.A list of organizations represented on this committee can beobtained on

3、request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 83429 5ICS 91.140.40; 97.100.20Compliance wi

4、th a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 14459:2015EUROPEAN STANDARD NOR

5、ME EUROPENNE EUROPISCHE NORM EN 14459 November 2015 ICS 91.140.40; 97.100.20 Supersedes EN 14459:2007English Version Safety and control devices for burners and appliances burning gaseous or liquid fuels - Control functions in electronic systems - Methods for classification and assessment Dispositifs

6、 de commande et de scurit pour brleurs et appareils utilisant des combustibles gazeux ou liquides - Fonctions de commande des systmes lectroniques - Mthodes de classification et dvaluation Sicherheits- und Regeleinrichtungen fr Brenner und Brennstoffgerte fr gasfrmige oder flssige Brennstoffe - Rege

7、l- und Steuerfunktionen in elektronischen Systemen - Verfahren fr die Klassifizierung und Bewertung This European Standard was approved by CEN on 19 September 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Stand

8、ard 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

9、, 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, Bul

10、garia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, T

11、urkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members

12、. Ref. No. EN 14459:2015 EBS EN 14459:2015EN 14459:2015 (E) 2 Contents Page European foreword . 5 1 Scope 7 2 Normative references 7 3 Terms and definitions . 7 4 Classification . 7 4.1 Classes of control . 7 4.2 Groups of control . 7 4.3 Classes of control functions . 7 4.4 Types of DC supplied con

13、trols 7 5 Units of measurement and test conditions 7 6 Construction requirements . 7 6.1 General 7 6.2 Mechanical parts of the control . 8 6.3 Materials . 8 6.4 Gas connections . 8 6.5 Electrical parts of the control . 8 6.6 Protection against internal faults for the purpose of functional safety 8 6

14、.101 Requirements for new control solutions 8 6.101.1 General 8 6.101.2 Assessment of the appliance . 8 6.101.3 Translation to control requirements. 9 7 Performance 9 7.1 General 9 7.2 Leak-tightness 9 7.3 Torsion and bending 9 7.4 Rated flow rate . 9 7.5 Durability . 9 7.6 Performance test for elec

15、tronic controls . 9 7.7 Long-term performance for electronic controls 9 7.8 Data exchange. 9 7.101 Combined apparatus . 10 8 Electrical requirements . 10 8.1 General . 10 8.2 Protection by enclosure . 10 9 Electromagnetic compatibility (EMC) . 10 9.1 Protection against environmental influences . 10

16、9.2 Supply voltage variations below 85 % of rated voltage . 10 9.3 Voltage dips and interruptions . 10 9.4 Supply frequency variations 10 9.5 Surge immunity tests 10 9.6 Electrical fast transient/burst . 10 9.7 Immunity to conducted disturbances induced by radio frequency fields . 10 9.8 Immunity to

17、 radiated disturbances induced by radio frequency fields. 10 9.9 Electrostatic discharge test 10 9.10 Power frequency magnetic field immunity tests 10 9.11 Harmonics and interharmonics including mains signalling at a. c. power port, low frequency immunity tests . 11 10 Marking, installation and oper

18、ating instructions 11 BS EN 14459:2015EN 14459:2015 (E) 3 10.1 Marking 11 10.2 Installation and operating instructions . 11 10.3 Warning notice 11 Annex A (informative) Abbreviations and symbols 12 Annex B (informative) Leak-tightness test for gas controls Volumetric method 13 Annex C (informative)

19、Leak-tightness test for gas controls Pressure loss method 14 Annex D (normative) Conversion of pressure loss into leakage rate . 15 Annex E (normative) Electrical/electronic component fault modes 16 Annex F (normative) Additional requirements for safety accessories and pressure accessories as define

20、d in EU Directive 97/23/EC . 17 Annex G (normative) Materials for pressurised parts . 18 Annex H (normative) Additional materials for pressurised parts. 19 Annex I (normative) Requirements for controls used in DC supplied burners and appliances burning gaseous or liquid fuels . 20 Annex J (normative

21、) Method for the determination of a Safety Integrity Level (SIL) . 21 Annex K (normative) Method for the determination of a Performance Level (PL) . 22 Annex L (informative) Relationship between Safety Integrity Level (SIL) and Performance Level (PL) 23 Annex M (normative) Reset functions 24 Annex N

22、 (informative) Guidance document on environmental aspects 25 Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures 26 Annex AA (informative) Example of a risk assessment method . 27 Annex BB (informative) Example of a risk assessment according to method described in Annex AA 29 B

23、B.1 Introduction . 29 BB.2 Risks 29 BB.3 Risk assessment 29 Annex CC (informative) Realisation of a protective measure 32 Annex DD (informative) Hazards in gas and oil appliances handled by control functions 34 Annex EE (informative) Classification of control functions based on the determination of

24、basic risks . 38 Bibliography . 42 Tables Table BB.1 Example of risk assessment 30 Table DD.1 Gas and oil burning process and safety control functions. 35 Table EE.1 Classification of parameter S 40 Table EE.2 Classification of parameter O . 41 Table EE.3 Classification of parameter D . 41 Table EE.

25、4 Classification result = S + O + D . 41 BS EN 14459:2015EN 14459:2015 (E) 4 Figures Figure AA.1 Example of a risk assessment method . 27 Figure BB.1 Common systems for C4Types, examples of risk assessment . 29 Figure CC.1 Layers of a safety system 32 BS EN 14459:2015EN 14459:2015 (E) 5 European for

26、eword This document (EN 14459:2015) 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

27、publication of an identical text or by endorsement, at the latest by May 2016, and conflicting national standards shall be withdrawn at the latest by May 2016. 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 sha

28、ll not be held responsible for identifying any or all such patent rights. This document supersedes EN 14459:2007. Control systems are designed to control and protect gas and/or oil appliances and the combustion process. All functions are performed depending on their safety relevance within a specifi

29、c tolerance of measures and time with a specific certainty under external influences and internal failures. It was concluded by CEN/TC 58 that it is not always necessary to protect against the consequences of hazardous events with uniform measures as hazards differ in severity and the probability of

30、 unwanted occurrences may differ. As there exist large differences of interpretation on what level of protection is necessary against certain hazards, there is a need for guidance to bring the safety philosophy for gas and oil appliances and controls in line. The discussions of CEN/TC 58 regarding s

31、afety related control functions and the use of controls systems in the appliances show that it is worthwhile to refine the basic safety philosophy of gas and oil appliances into different risk levels. For the evaluation of preventative measures concerning fault tolerance and avoidance of hazards, it

32、 is essential to classify control functions with regard to their fault behaviour. For the classification of control functions, their integration into the complete safety concept of the appliance should be taken into account. In the appliance standards, only specific fault conditions are considered w

33、hen controls conforming to CEN/TC 58 standards are used, e.g. flame simulation and air proving before each new start. In some cases (e.g. switch contacts) shorting is excluded, when certain tests have proven that the probability of a fault occurrence is low. For gas valves, a single shut-off valve i

34、s considered insufficient. This standard will give methods for the assessment of products in the field of gas and oil applications and control solutions for which no specific product standards are actually available. The assessment is described in three steps: assessment of the application, translat

35、ion into control requirements, assessment of the control solution, leading to a defined safety class and a set of safety measures with additional/modified construction and test requirements for the application and/or the specified control function. The assessment is focused on the controlled paramet

36、ers (e.g. high/low temperature, pressure, flow, combustion quality) in the combustion process and in the functionality of the controls (e.g. open/closed; lock/unlock; start/stop). Each control function needs to be classified according to the required safety aspects (Class A, B, C). To analyse the ef

37、fect of fault conditions it is essential to know the specific application and the related risk. It should be noted that the following significant editorial changes compared to the previous edition have been incorporated in this European Standard: BS EN 14459:2015EN 14459:2015 (E) 6 a) methods for cl

38、assification and risk assessment are more detailed; b) methods are described starting on appliance level; c) controls for burners and appliances burning liquid fuels (electronic) added; d) introduction of new informative annexes based on the determination of basic risks: Annex AA “Example of a risk

39、assessment method“, Annex BB “Example of a risk assessment with the method described in Annex AA“ (former Annex M), Annex CC “Realisation of a protective measure“, Annex DD “Hazards in gas and oil appliances handled by control functions“ and Annex EE “Classification of control functions based on the

40、 determination of basic Annex EE “Classification of control functions“. e) deletion of the following annexes which shall be included into a new standard on temperature control functions (TCF) in CEN/TC 58: Annex I “Combustion product discharge function (TTB)“, Annex K “Temperature control functions

41、(TCF)“, Annex N “Control standards for gas burners and gas burning appliances“. f) deletion of Annex L “Gas shut-off function“ (content moved into EN 161); g) deletion of the former Annex O “Examples of new solutions“ (content moved into EN 161). According to the CEN/CENELEC Internal Regulations, th

42、e national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvi

43、a, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 14459:2015EN 14459:2015 (E) 7 1 Scope This European Standard specifies methods for the classification and assessment of function block

44、s designed to operate burners and appliances burning gaseous or liquid fuels with particular regards to their fault behaviour and preventative measures. This European Standard is applicable to control function blocks, not covered by a dedicated control standard (e.g. EN 88-1:2011, EN 88-2:2007, EN 1

45、25:2010, EN 126:2012, EN 126:2012/prA1:2014, EN 161:2011+A3:2013, EN 257:2010, EN 298:2012, EN 1106:2010, EN 1643:2014, EN 1854:2010, EN 12067-2:2004, EN 16304:2013 and EN 16340:2014, EN ISO 23553-1:2014). 2 Normative references The following documents, in whole or in part, are normatively reference

46、d 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 13611:2015, Safety and control devices for burners and appliances burning g

47、aseous and/or liquid fuels General requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13611:2015, Clause 3 and the following apply. 3.101 function block part of an electric or electronic system which realises at least one control function wi

48、th one input and one output signal 4 Classification 4.1 Classes of control Shall be according to EN 13611:2015, 4.1. 4.2 Groups of control Shall be according to EN 13611:2015, 4.2. 4.3 Classes of control functions Shall be according to EN 13611:2015, 4.3 with the following addition: The class of the

49、 control function shall be determined from the results of the risk assessment in 6.101 and specified in the installation and operating instructions. 4.4 Types of DC supplied controls Shall be according to EN 13611:2015, 4.4. 5 Units of measurement and test conditions Shall be according to EN 13611:2015, Clause 5. 6 Construction requirements 6.1 General Shall be according to EN 13611:2015, 6.1 with the following addition: The outcome of the specific assessment in 6.101 can modify or extend the requirements of 6.1 to 6.6.