Safety and control devices for burners and appliances burning gaseous or liquid fuels - Control functions in electronic systems - Methods for classification and assessment

This European Standard specifies methods for the classification and assessment of function blocks 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 new control function blocks, not covered by dedicated control standards.

Sicherheits- und Regeleinrichtungen für Brenner und Brennstoffgeräte für gasförmige oder flüssige Brennstoffe - Regel- und Steuerfunktionen in elektronischen Systemen - Verfahren für die Klassifizierung und Bewertung

EN 13611:2019, Abschnitt 1, wird durch das Folgende ersetzt:
Dieses Dokument legt Verfahren für die Klassifizierung und Bewertung von Funktionsblöcken für Brenner und Brennstoffgeräte für einen oder mehrere gasförmige(n) Brennstoff(e) oder flüssige Brennstoffe fest, insbesondere hinsichtlich ihres Fehlerverhaltens und der Schutzmaßnahmen.
Dieses Dokument gilt für neue Regel- und Steuerfunktionsblöcke, die nicht durch spezielle Kontrollnormen abgedeckt sind.

Dispositifs de commande et de sécurité pour brûleurs et appareils utilisant des combustibles gazeux ou liquides - Fonctions de commande des systèmes électroniques - Méthodes de classification et d’évaluation

L’article 1 de l’EN13611 :2019 est remplacé par le suivant :
Ce document spécifie des méthodes pour la classification et l’évaluation des blocs de fonction de commande des brûleurs et des appareils à combustibles gazeux ou liquides, en particulier en ce qui concerne leur comportement au défaut et les mesures préventives.
Ce document est applicable aux blocs de fonction de commande qui ne sont pas couverts par des normes de dispositifs particulières.

Varnostne in nadzorne naprave za gorilnike in aparate na plin ali tekoča goriva - Regulacijske in nadzorne funkcije v elektronskih sistemih - Metode za razvrščanje in ocenjevanje

Ta evropski standard določa metode za razvrščanje in ocenjevanje funkcijskih blokov, namenjenih za upravljanje gorilnikov in aparatov na plin ali tekoča goriva, zlasti glede njihovega odziva na napake in preventivnih ukrepov.
Ta evropski standard se uporablja za nove nadzorne funkcijske bloke, ki niso zajeti v namenskih nadzornih standardih.

General Information

Status
Published
Public Enquiry End Date
02-Nov-2020
Publication Date
14-Mar-2022
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Mar-2022
Due Date
16-May-2022
Completion Date
15-Mar-2022

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SLOVENSKI STANDARD
SIST EN 14459:2022
01-april-2022
Nadomešča:
SIST EN 14459:2016

Varnostne in nadzorne naprave za gorilnike in aparate na plin ali tekoča goriva -

Regulacijske in nadzorne funkcije v elektronskih sistemih - Metode za razvrščanje

in ocenjevanje

Safety and control devices for burners and appliances burning gaseous or liquid fuels -

Control functions in electronic systems - Methods for classification and assessment

Sicherheits- und Regeleinrichtungen für Brenner und Brennstoffgeräte für gasförmige

oder flüssige Brennstoffe - Regel- und Steuerfunktionen in elektronischen Systemen -

Verfahren für die Klassifizierung und Bewertung
Dispositifs de commande et de sécurité pour brûleurs et appareils utilisant des

combustibles gazeux ou liquides - Fonctions de commande des systèmes électroniques

- Méthodes de classification et dévaluation
Ta slovenski standard je istoveten z: EN 14459:2021
ICS:
27.060.01 Gorilniki in grelniki vode na Burners and boilers in
splošno general
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
97.100.01 Grelniki na splošno Heating appliances in
general
SIST EN 14459:2022 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 14459:2022
---------------------- Page: 2 ----------------------
SIST EN 14459:2022
EN 14459
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2021
EUROPÄISCHE NORM
ICS 91.140.40; 97.100.20 Supersedes EN 14459:2015
English 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 de commande et de sécurité pour brûleurs Sicherheits- und Regeleinrichtungen für Brenner und

et appareils utilisant des combustibles gazeux ou Brennstoffgeräte für gasförmige oder flüssige

liquides - Fonctions de commande des systèmes Brennstoffe - Regel- und Steuerfunktionen in

électroniques - Méthodes de classification et elektronischen Systemen - Verfahren für die

d'évaluation Klassifizierung und Bewertung
This European Standard was approved by CEN on 24 October 2021.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14459:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 14459:2022
EN 14459:2021 (E)
Contents Page

European foreword ...................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 6

4 Classification..................................................................................................................................................... 6

4.1 Classes of control ............................................................................................................................................ 6

4.2 Groups of control ............................................................................................................................................ 6

4.3 Classes of control functions ......................................................................................................................... 6

4.4 Types of DC supplied controls .................................................................................................................... 6

5 Test conditions and uncertainty of measurements ............................................................................ 6

6 Design and construction ............................................................................................................................... 7

6.1 General................................................................................................................................................................ 7

6.2 Mechanical parts of the control ................................................................................................................. 7

6.3 Materials ............................................................................................................................................................ 7

6.4 Gas connections ............................................................................................................................................... 7

6.5 Electrical parts of the control ..................................................................................................................... 7

6.6 Protection against internal faults for the purpose of functional safety ...................................... 7

6.101 Requirements for new control solutions ............................................................................................... 7

6.101.1 General ....................................................................................................................................................... 7

6.101.2 Assessment of the appliance .............................................................................................................. 7

6.101.3 Translation into control requirements .......................................................................................... 8

7 Performance ..................................................................................................................................................... 8

7.1 General................................................................................................................................................................ 8

7.2 Leak-tightness .................................................................................................................................................. 8

7.3 Torsion and bending ...................................................................................................................................... 8

7.4 Rated flow rate ................................................................................................................................................. 9

7.5 Durability ........................................................................................................................................................... 9

7.6 Performance tests for electronic controls ............................................................................................. 9

7.7 Long-term performance for electronic controls .................................................................................. 9

7.8 Data exchange .................................................................................................................................................. 9

7.101 Combined apparatus...................................................................................................................................... 9

8 Electrical requirements ................................................................................................................................ 9

8.1 General................................................................................................................................................................ 9

8.2 Protection by enclosure................................................................................................................................ 9

9 Electromagnetic compatibility (EMC) ..................................................................................................... 9

9.1 Protection against environmental influences ...................................................................................... 9

9.2 Supply voltage variations below 85 % of rated voltage .................................................................... 9

9.3 Voltage dips and interruptions .................................................................................................................. 9

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 radiated disturbances induced by radio frequency fields ................................... 10

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SIST EN 14459:2022
EN 14459:2021 (E)

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 .......................................................................................................................... 10

10 Marking, instructions .................................................................................................................................. 10

10.1 Marking ............................................................................................................................................................ 10

10.2 Instructions ..................................................................................................................................................... 10

10.3 Warning notice .............................................................................................................................................. 10

Annex A (informative) Abbreviations and symbols ...................................................................................... 11

Annex B (informative) Leak-tightness tests for gas controls – volumetric method .......................... 12

Annex C (informative) Leak-tightness tests for gas controls – pressure loss method ...................... 13

Annex D (normative) Calculation of pressure loss into leakage rate ..................................................... 14

Annex E (normative) Electrical/electronic component fault modes ...................................................... 15

Annex F (normative) Additional requirements for safety accessories and pressure

accessories as defined in EU Directive 2014/68/EU ........................................................................ 16

Annex G (normative) Materials for pressurized parts ................................................................................. 17

Annex H (normative) Additional materials for pressurized parts........................................................... 18

Annex I (normative) Requirements for controls used in DC supplied burners and

appliances burning gaseous or liquid fuels ......................................................................................... 19

Annex J (normative) Method for the determination of a Safety Integrity Level (SIL) ....................... 20

Annex K (normative) Method for the determination of a Performance Level (PL) ........................... 21

Annex L (informative) Relationship between Safety Integrity Level (SIL) and

Performance Level (PL) .............................................................................................................................. 22

Annex M (normative) Reset functions ................................................................................................................ 23

Annex N (informative) Guidance document on Environmental Aspects ............................................... 24

Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures ...................................... 25

Annex AA (informative) Example of a risk assessment method ............................................................... 26

Annex BB (informative) Example of a risk assessment according to method described in

Annex AA .......................................................................................................................................................... 28

BB.1 General ............................................................................................................................................................. 28

BB.2 Risks .................................................................................................................................................................. 28

BB.3 Risk assessment ............................................................................................................................................ 28

Annex CC (informative) Realization of a protective measure .................................................................... 31

Annex DD (informative) Hazards in gas and oil appliances handled by control functions ............ 33

Annex EE (informative) Classification of control functions based on the determination of

basic risks ........................................................................................................................................................ 37

Bibliography ................................................................................................................................................................. 41

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SIST EN 14459:2022
EN 14459:2021 (E)
European foreword

This document (EN 14459:2021) 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 May 2022, and conflicting national standards shall be

withdrawn at the latest by May 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 14459:2015.

The following significant changes compared to the previous edition have been incorporated in this

document:
a) Alignment with EN 13611:2019;
b) Clause 2 “Normative references” has been updated;
c) The Bibliography has been updated.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North

Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United

Kingdom.
---------------------- Page: 6 ----------------------
SIST EN 14459:2022
EN 14459:2021 (E)
Introduction
This document is intended to be used in conjunction with EN 13611:2019.

This document refers to clauses of EN 13611:2019 or adapts it by stating “with the following

modification”, “with the following addition”, “is replaced by the following” or “is not applicable” in the

corresponding clause.

This document adds clauses or subclauses to the structure of EN 13611:2019 which are particular to this

document. Subclauses which are additional to those in EN 13611 are numbered starting from 101.

Additional Annexes are designated as Annex AA, Annex BB, Annex CC, etc. It should be noted that these

clauses, subclauses and Annexes are not indicated as an addition.

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 specific 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 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 safety related control

functions and the use of control 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 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 when 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 is considered insufficient.

This document gives methods for the assessment of control functions in controls for burners and

appliances burning one or more gaseous or liquid fuels for which no specific product standards are

actually available. The assessment is described in three steps:
— assessment of the application,
— translation into control requirements,
— assessment of the control solution,

leading to defined classes for the specified control function(s)and a set of safety measures with

additional/modified construction and test requirements for the application and/or the specified control

function(s).

The assessment is focused on the controlled parameters (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 effect of fault conditions it is essential to know the specific application and to determine

the related risks.
---------------------- Page: 7 ----------------------
SIST EN 14459:2022
EN 14459:2021 (E)
1 Scope
EN 13611:2019, Clause 1 is replaced by the following:

This document specifies methods for the classification and assessment of function blocks for burners and

appliances burning one or more gaseous or liquid fuels with particular regards to their fault behaviour

and preventative measures.

This document is applicable to new control function blocks, not covered by dedicated control standards.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 13611:2019, Safety and control devices for burners and appliances burning gaseous and/or liquid fuels

- General requirements
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 13611:2019 apply with the

following modifications.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.101
function block

part of an electric or electronic system which realises at least one control function with one input and one

output signal
4 Classification
4.1 Classes of control
EN 13611:2019, 4.1 is not applicable.
4.2 Groups of control
Shall be according to EN 13611:2019, 4.2.
4.3 Classes of control functions
Shall be according to EN 13611:2019, 4.3 with the following addition:

The class of the control function shall be determined from the results of the risk assessment in 6.101 and

specified in the instructions.
4.4 Types of DC supplied controls
Shall be according to EN 13611:2019, 4.4.
5 Test conditions and uncertainty of measurements
Shall be according to EN 13611:2019, Clause 5.
---------------------- Page: 8 ----------------------
SIST EN 14459:2022
EN 14459:2021 (E)
6 Design and construction
6.1 General
Shall be according to EN 13611:2019, 6.1 with the following addition:

The specific assessment shall be performed according to 6.101. Its outcome shall be verified concerning

its impact to the applicability of 6.1 to 6.6.
6.2 Mechanical parts of the control
Shall be according to EN 13611:2019, 6.2.
6.3 Materials
Shall be according to EN 13611:2019, 6.3.
6.4 Gas connections
Shall be according to EN 13611:2019, 6.4.
6.5 Electrical parts of the control
Shall be according to EN 13611:2019, 6.5.
6.6 Protection against internal faults for the purpose of functional safety
Shall be according to EN 13611:2019, 6.6.
6.101 Requirements for new control solutions
6.101.1 General

Appliance designs are based on safe operation avoiding any harm for persons, domestic animals or

property when normally used. Possible hazards arising from the appliance can be expressed in inherent

risks, being considered in relation to the combustion (use) of gas and oil and heating of water.

For known control and appliance solutions, risks are considered to be covered by the requirements in the

dedicated control standards and appliance standards.

Appliances with new control solutions shall be subjected to a further risk assessment according to 6.101.2

depending on their design, either:
— well-known appliance designs, or
— new appliance solutions.
6.101.2 Assessment of the appliance

The required protective measures, resulting from a risk assessment on the new or well-known appliance

design or solution are the basis for the assessment of new control solutions. The risk assessment shall be

performed and documented in order to identify the risks and the required protective measures covering

these risks.
At least the following information shall be specified:
— classification of basic hazards;

— Annex AA gives examples of existing basic hazards in gas and/or oil appliances;

— risk assessment and the resulting protective measures;
---------------------- Page: 9 ----------------------
SIST EN 14459:2022
EN 14459:2021 (E)
— Annex EE specifies a method for classification of control functions;
— classification of protective measures;
— fault tolerating time for specific faults;
— additional requirements for the application.
Based on this information the following measures may be taken:
— specification of controls according to known control standards; and/or
— additional appliance construction requirements; and/or

— specification of new type of control based on the required protective measure and/or the additional

requirements.
In Annex AA, a risk assessment method on appliance level is given.

In Annex BB and Annex DD examples are given for the method described in Annex AA.

6.101.3 Translation into control requirements

If – based on the outcome of the risk assessment on the appliance –new types of controls are required,

the protective measures and, where possible, the additional requirements from this risk assessment have

to be translated into control requirements.

A further assessment on the foreseen control solution shall be performed and documented including the

assumptions made and reasoning how the required safety level is achieved.
This outcome shall lead to a conclusion:
— on relevant class of control function(s) according to 4.3;
— on additional or modified construction(s), performance or EMC requirements;
— on further fault modes to be considered in the fault assessment of 6.6;

— on the need to extend the list of markings and the contents of the instructions.

For specific faults, a fault reaction time shall be specified for the control, taking into account the fault

tolerating time of the application as a maximum.

Annex CC provides guidance for the realization of protective measures by controls.

7 Performance
7.1 General
Shall be according to EN 13611:2019, 7.1 with the following addition:

The outcome of the specific assessment according to 6.101 shall be verified concerning its impact to the

applicability of the requirements of Clause 7.
7.2 Leak-tightness
Shall be according to EN 13611:2019, 7.2.
7.3 Torsion and bending
Shall be according to EN 13611:2019, 7.3.
---------------------- Page: 10 ----------------------
SIST EN 14459:2022
EN 14459:2021 (E)
7.4 Rated flow rate
Shall be according to EN 13611:2019, 7.4.
7.5 Durability
Shall be according to EN 13611:2019, 7.5.
7.6 Performance tests for electronic controls
Shall be according to EN 13611:2019, 7.6.
7.7 Long-term performance for electronic controls
Shall be according to EN 13611:2019, 7.7.
7.8 Data exchange
Shall be according to EN 13611:2019, 7.8.
7.101 Combined apparatus

If a system consists of two or more combined apparatuses with different control functions, the

interconnection and interference of the involved apparatus shall be considered during fault assessment.

Safety of a control function shall not be impaired by its integration in a gas or oil appliance or system.

Responsibilities and safety critical interface parameters shall be declared for incorporating the control in

an over-all-system.
8 Electrical requirements
8.1 General
Shall be according to EN 13611:2019, 8.1 with the following addition:

The outcome of the specific assessment according to 6.101 shall be verified concerning its impact to the

applicability of the requirements of Clause 8.

NOTE Depending on the outcome of the assessment according to 6.101, EN 60730-1 and specific part of

EN 60730-2 can be applicable.
8.2 Protection by enclosure
Shall be according to EN 13611:2019, 8.2.
9 Electromagnetic compatibility (EMC)
9.1 Protection against environmental influences
Shall be according to EN 13611:2019, 9.1 with the following addition:

The outcome of the specific assessment according to 6.101 shall be verified concerning its impact to the

applicability of the requirements of Clause 9.
9.2 Supply voltage variations below 85 % of rated voltage
Shall be according to EN 13611:2019, 9.2.
9.3 Voltage dips and interruptions
Shall be according to EN 13611:2019, 9.3.
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SIST EN 14459:2022
EN 14459:2021 (E)
9.4 Supply frequency variations
Shall be according to EN 13611:2019, 9.4.
9.5 Surge immunity tests
Shall be according to EN 13611:2019, 9.5.
9.6 Electrical fast transient/burst
Shall be according to EN 13611:2019, 9.6.
9.7 Immunity to conducted disturbances induced by radio frequency fields
Shall be according to EN 13611:2019, 9.7.
9.8 Immunity to radiated disturbances induced by radio frequency fields
Shall be according to EN 13611:2019, 9.8.
9.9 Electrostatic discharge test
Shall be according to EN 13611:2019, 9.9.
9.10 Power frequency magnetic field immunity tests
Shall be according to EN 13611:2019, 9.10.
9.11 Harmoni
...

SLOVENSKI STANDARD
oSIST prEN 14459:2020
01-oktober-2020

Varnostne in nadzorne naprave za gorilnike in aparate na plin ali tekoča goriva -

Regulacijske in nadzorne funkcije v elektronskih sistemih - Metode za razvrščanje

in ocenjevanje

Safety and control devices for burners and appliances burning gaseous or liquid fuels -

Control functions in electronic systems - Methods for classification and assessment

Sicherheits- und Regeleinrichtungen für Brenner und Brennstoffgeräte für gasförmige

oder flüssige Brennstoffe - Regel- und Steuerfunktionen in elektronischen Systemen -

Verfahren für die Klassifizierung und Bewertung
Dispositifs de commande et de sécurité pour brûleurs et appareils utilisant des

combustibles gazeux ou liquides - Fonctions de commande des systèmes électroniques

- Méthodes de classification et dévaluation
Ta slovenski standard je istoveten z: prEN 14459
ICS:
27.060.01 Gorilniki in grelniki vode na Burners and boilers in
splošno general
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
97.100.01 Grelniki na splošno Heating appliances in
general
oSIST prEN 14459:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 14459:2020
---------------------- Page: 2 ----------------------
oSIST prEN 14459:2020
DRAFT
EUROPEAN STANDARD
prEN 14459
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 91.140.40; 97.100.20 Will supersede EN 14459:2015
English 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 de commande et de sécurité pour brûleurs Sicherheits- und Regeleinrichtungen für Brenner und

et appareils utilisant des combustibles gazeux ou Brennstoffgeräte für gasförmige oder flüssige

liquides - Fonctions de commande des systèmes Brennstoffe - Regel- und Steuerfunktionen in

électroniques - Méthodes de classification et elektronischen Systemen - Verfahren für die

d¿évaluation Klassifizierung und Bewertung

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 58.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14459:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 14459:2020
prEN 14459:2020 (E)
Contents Page

European foreword ...................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 6

4 Classification..................................................................................................................................................... 6

4.1 Classes of control ............................................................................................................................................ 6

4.2 Groups of control ............................................................................................................................................ 6

4.3 Classes of control functions ......................................................................................................................... 6

4.4 Types of DC supplied controls .................................................................................................................... 6

5 Test conditions and uncertainty of measurements ............................................................................ 6

6 Design and Construction .............................................................................................................................. 7

6.1 General................................................................................................................................................................ 7

6.2 Mechanical parts of the control ................................................................................................................. 7

6.3 Materials ............................................................................................................................................................ 7

6.4 Gas connections ............................................................................................................................................... 7

6.5 Electrical parts of the control ..................................................................................................................... 7

6.6 Protection against internal faults for the purpose of functional safety ...................................... 7

6.101 Requirements for new control solutions ............................................................................................... 7

6.101.1 General ....................................................................................................................................................... 7

6.101.2 Assessment of the appliance .............................................................................................................. 7

6.101.3 Translation into control requirements .......................................................................................... 8

7 Performance ..................................................................................................................................................... 8

7.1 General................................................................................................................................................................ 8

7.2 Leak-tightness .................................................................................................................................................. 8

7.3 Torsion and bending ...................................................................................................................................... 8

7.4 Rated flow rate ................................................................................................................................................. 8

7.5 Durability ........................................................................................................................................................... 8

7.6 Performance test for electronic controls ............................................................................................... 9

7.7 Long-term performance for electronic controls .................................................................................. 9

7.8 Data exchange .................................................................................................................................................. 9

7.101 Combined apparatus...................................................................................................................................... 9

8 Electrical requirements ................................................................................................................................ 9

8.1 General................................................................................................................................................................ 9

8.2 Protection by enclosure................................................................................................................................ 9

9 Electromagnetic compatibility (EMC) ..................................................................................................... 9

9.1 Protection against environmental influences ...................................................................................... 9

9.2 Supply voltage variations below 85 % of rated voltage .................................................................... 9

9.3 Voltage dips and interruptions .................................................................................................................. 9

9.4 Supply frequency variations ....................................................................................................................... 9

9.5 Surge immunity tests ..................................................................................................................................... 9

9.6 Electrical fast transient/burst .................................................................................................................... 9

9.7 Immunity to conducted disturbances induced by radio frequency fields ............................... 10

9.8 Immunity to 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 .......................................................................................................................... 10

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10 Marking, instructions .................................................................................................................................. 10

10.1 Marking ............................................................................................................................................................ 10

10.2 Instructions ..................................................................................................................................................... 10

10.3 Warning notice .............................................................................................................................................. 10

Annex A (informative) Abbreviations and symbols ...................................................................................... 11

Annex B (informative) Leak-tightness test for gas controls – Volumetric method ............................ 12

Annex C (informative) Leak-tightness test for gas controls – Pressure loss method ........................ 13

Annex D (normative) Conversion of pressure loss into leakage rate ..................................................... 14

Annex E (normative) Electrical/electronic component fault modes ...................................................... 15

Annex F (normative) Additional requirements for safety accessories and pressure

accessories as defined in EU Directive 2014/68/EU ........................................................................ 16

Annex G (normative) Materials for pressurized parts ................................................................................. 17

Annex H (normative) Additional materials for pressurized parts........................................................... 18

Annex I (normative) Requirements for controls used in DC supplied burners and

appliances burning gaseous or liquid fuels ......................................................................................... 19

Annex J (normative) Method for the determination of a Safety Integrity Level (SIL) ....................... 20

Annex K (normative) Method for the determination of a Performance Level (PL) ........................... 21

Annex L (informative) Relationship between Safety Integrity Level (SIL) and

Performance Level (PL) .............................................................................................................................. 22

Annex M (normative) Reset functions ................................................................................................................ 23

Annex N (informative) Guidance document on environmental aspects ................................................ 24

Annex O (normative) Seals of elastomer, cork and synthetic fibre mixtures ...................................... 25

Annex AA (informative) Example of a risk assessment method ............................................................... 26

Annex BB (informative) Example of a risk assessment according to method described in

Annex AA .......................................................................................................................................................... 28

BB.1 Introduction .................................................................................................................................................... 28

BB.2 Risks .................................................................................................................................................................. 28

BB.3 Risk assessment ............................................................................................................................................ 28

Annex CC (informative) Realization 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

basic risks ........................................................................................................................................................ 38

Bibliography ................................................................................................................................................................. 42

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European foreword

This document (prEN 14459:2020) 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 document is currently submitted to the CEN Enquiry.
This document will supersede EN 14459:2015.
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Introduction

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 specific 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 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 safety 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 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 when 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 is considered insufficient.

This document gives 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,
— translation into control requirements,
— assessment of the control solution,

leading to defined classes for the specified control function(s)and a set of safety measures with

additional/modified construction and test requirements for the application and/or the specified control

function(s).

The assessment is focused on the controlled parameters (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 effect of fault conditions it is essential to know the specific application and the related

risk.
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1 Scope

This document specifies methods for the classification and assessment of function blocks designed to

operate burners and appliances burning gaseous or liquid fuels with particular regards to their fault

behaviour and preventative measures.

This document is applicable to new control function blocks, not covered by dedicated control standards.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 13611:2019, Safety and control devices for burners and appliances burning gaseous and/or liquid fuels

- General requirements
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 13611:2019, Clause 3 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.101
function block

part of an electric or electronic system which realises at least one control function with one input and

one output signal
4 Classification
4.1 Classes of control
EN 13611:2019, 4.1 is not applicable.
4.2 Groups of control
Shall be according to EN 13611:2019, 4.2.
4.3 Classes of control functions
Shall be according to EN 13611:2019, 4.3 with the following addition:

The class of the control function shall be determined from the results of the risk assessment in 6.101

and specified in the instructions.
4.4 Types of DC supplied controls
Shall be according to EN 13611:2019, 4.4.
5 Test conditions and uncertainty of measurements
Shall be according to EN 13611:2019, 5.
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6 Design and Construction
6.1 General
Shall be according to EN 13611:2019, 6.1 with the following addition:

The specific assessment shall be performed according to 6.101. Its outcome shall be verified concerning

its impact to the applicability of the requirements of Clauses 6.1 to 6.6.
6.2 Mechanical parts of the control
Shall be according to EN 13611:2019, 6.2.
6.3 Materials
Shall be according to EN 13611:2019, 6.3.
6.4 Gas connections
Shall be according to EN 13611:2019, 6.4.
6.5 Electrical parts of the control
Shall be according to EN 13611:2019, 6.5.
6.6 Protection against internal faults for the purpose of functional safety
Shall be according to EN 13611:2019, 6.6.
6.101 Requirements for new control solutions
6.101.1 General

Appliance designs are based on safe operation avoiding any harm for persons, domestic animals or

property when normally used. Possible hazards arising from the appliance can be expressed in inherent

risks, being considered in relation to the combustion (use) of gas and oil and heating of water.

For known control and appliance solutions, risks are considered to be covered by the requirements in

the available control standards and appliance standards.

Appliances with new control solutions shall be subjected to a further risk assessment according to

Clause 6.101.2 depending on their design, either:
— well-known appliance designs, or
— new appliance solutions.
6.101.2 Assessment of the appliance

The required protective measures, resulting from a risk assessment on the new or well-known

appliance design or solution are the basis for the assessment of new control solutions. The risk

assessment shall be performed and documented in order to identify the risks and the required

protective measures covering these risks.
At least the following information shall be specified:
— classification of basic hazards;

— Annex AA gives examples of existing basic hazards in gas and/or oil appliances.

— risk assessment and the resulting protective measures;
— Annex EE specifies a method for classification of control functions.
— classification of protective measures;
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— fault tolerating time for specific faults;
— additional requirements for the application.
Based on this information the following measures may be taken:
— specification of controls according to known control standards; and/or
— additional appliance construction requirements; and/or

— specification of new type of control based on the required protective measure and/or the additional

requirements.
In Annex AA, a risk assessment method on appliance level is given.

In Annex BB and Annex DD examples are given for the method described in Annex AA.

6.101.3 Translation into control requirements

If – based on the outcome of the risk assessment on the appliance –new types of control are required,

the protective measures and, where possible the additional requirements from this risk assessment,

have to be translated into control requirements.

A further assessment on the foreseen control solution shall be performed and documented including the

assumptions made and reasoning how the required safety level is achieved.
This outcome shall lead to a conclusion:
— on relevant class of control function(s) according to 4.3;
— on additional or modified construction(s), performance or EMC requirements;
— on further fault modes to be considered in the fault assessment of 6.6;

— on the need to extend the list of markings and the contents of the instructions.

For specific faults, a fault reaction time shall be specified for the control, taking into account the fault

tolerating time of the application as a maximum.

Annex CC provides guidance for the realization of protective measures by controls.

7 Performance
7.1 General
Shall be according to EN 13611:2019, 7.1 with the following addition:

The outcome of the specific assessment according to 6.101 shall be verified concerning its impact to the

applicability of the requirements of Clause 7.
7.2 Leak-tightness
Shall be according to EN 13611:2019, 7.2.
7.3 Torsion and bending
Shall be according to EN 13611:2019, 7.3.
7.4 Rated flow rate
Shall be according to EN 13611:2019, 7.4.
7.5 Durability
Shall be according to EN 13611:2019, 7.5.
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7.6 Performance test for electronic controls
Shall be according to EN 13611:2019, 7.6.
7.7 Long-term performance for electronic controls
Shall be according to EN 13611:2019, 7.7.
7.8 Data exchange
Shall be according to EN 13611:2019, 7.8.
7.101 Combined apparatus

If a system consists of two or more combined apparatuses with different control functions, the

interconnection and interference of the involved apparatus shall be considered during fault assessment.

Safety of a control function shall not be impaired by its integration in a gas or oil appliance or system.

Responsibilities and safety critical interface parameters shall be declared for incorporating the control

in an over-all-system.
8 Electrical requirements
8.1 General
Shall be according to EN 13611:2019, 8.1 with the following addition:

The outcome of the specific assessment according to 6.101 shall be verified concerning its impact to the

applicability of the requirements of Clause 8.

NOTE Depending on the outcome of the assessment according to 6.101 specific parts 2 of EN 60730 may be

applicable.
8.2 Protection by enclosure
Shall be according to EN 13611:2019, 8.2.
9 Electromagnetic compatibility (EMC)
9.1 Protection against environmental influences
Shall be according to EN 13611:2019, 9.1 with the following addition:

The outcome of the specific assessment according to 6.101 shall be verified concerning its impact to the

applicability of the requirements of Clause 9.
9.2 Supply voltage variations below 85 % of rated voltage
Shall be according to EN 13611:2019, 9.2.
9.3 Voltage dips and interruptions
Shall be according to EN 13611:2019, 9.3.
9.4 Supply frequency variations
Shall be according to EN 13611:2019, 9.4.
9.5 Surge immunity tests
Shall be according to EN 13611:2019, 9.5.
9.6 Electrical fast transient/burst
Shall be according to EN 13611:2019, 9.6.
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9.7 Immunity to conducted disturbances induced by radio frequency fields
Shall be according to EN 13611:2019, 9.7.
9.8 Immunity to radiated disturbances induced by radio frequency fields
Shall be according to EN 13611:2019, 9.8.
9.9 Electrostatic discharge test
Shall be according to EN 13611:2019, 9.9.
9.10 Power frequency magnetic field immunity tests
Shall be according to EN 13611:2019, 9.10.

9.11 Harmonics and interharmonics including mains signalling at a. c. power port, low

frequency immunity tests
Shall be according to EN 13611:2019, 9.11.
10 Marking, instructions
10.1 Marking
Shall be according to EN 13611:2019, 10.1 with the following addition:

Further requirements for marking shall be determined from the specific assessment performed

according to 6.101.
10.2 Instructions
Shall be according to EN 13611:2019, 10.2 with the following addition:

Further requirements for information in instructions shall be determined from the specific assessment

performed according to 6.101.
10.3 Warning notice
Shall be according to EN 13611:2019, 10.3.
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Annex A
(informative)
Abbreviations and symbols
Shall be according to EN 13611:2019, Annex A.
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Annex B
(informative)
Leak-tightness test for gas controls – Volumetric method
Shall be according to EN 13611:2019, Annex B.
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Annex C
(informative)
Leak-tightness test for gas controls – Pressure loss method
Shall be according to EN 13611:2019, Annex C.
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Annex D
(normative)
Conversion of pressure loss into leakage rate
Shall be according to EN 13611:2019, Annex D.
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Annex E
(normative)
Electrical/electronic
...

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