EN 126:2012/prA1

SLOVENSKI STANDARD
01-februar-2015
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Multifunctional controls for gas burning appliances
Mehrfachstellgeräte für Gasgeräte
Equipments multifonctionnels pour les appareils à gaz
Ta slovenski standard je istoveten z: EN 126:2012/prA1
ICS:
23.060.99 Drugi ventili Other valves
27.060.20 Plinski gorilniki Gas fuel burners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
EN 126:2012
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
November 2014
ICS 23.060.40
English Version
Multifunctional controls for gas burning appliances
Equipments multifonctionnels pour les appareils à gaz Mehrfachstellgeräte für Gasgeräte
This draft amendment is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 58.

This draft amendment A1, if approved, will modify the European Standard EN 126:2012. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.

This draft amendment 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, 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, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 126:2012/prA1:2014 E
worldwide for CEN national Members.

Contents
Page
Foreword .3
Annex BB (normative) Gas shut-off function .5
BB.1 Introduction .5
BB.2 Classification .6
BB.3 Construction requirements .6
BB.3.1 General .6
BB.3.2 Valve combinations .7
BB.3.3 Two automatic shut-off valves .7
BB.3.4 One automatic shut-off and one shut-off valve with SCE .7
BB.3.5 One automatic shut-off and one shut-off valve without SCE .7
BB.3.6 Two shut-off valves with SCE .7
BB.3.7 One shut-off with SCE and one shut-off valve without SCE .7
BB.3.8 Two shut-off valves without SCE .7
BB.4 Additional safety measures .7
BB.4.1 General .7
BB.4.2 Functional check (internal leakage, for systems with no SCE only) .7
BB.4.3 Electrical integrity of the actuator of the valve .8
BB.4.4 Closing torque or force of the actuator .8
BB.4.5 Sealing force test .8
BB.5 Performance requirements .8
BB.6 Protection against internal faults for the purpose of functional safety .8
BB.7 Long-term performance test .9
BB.8 EMC/Electrical requirements .9
BB.9 Marking, installation, operating instructions and declarations .9
Annex CC (informative) Examples of new solutions . 10
CC.1 Example . 10
CC.1.1 Description . 10
CC.1.2 Rationale . 10
CC.2 Example 2 . 11
CC.2.1 Description . 11
CC.2.2 Rationale . 11
CC.3 Example 3 . 11
CC.3.1 Description . 11
CC.3.2 Comparison between existing solution (EN 126) with a substitution of an automatic shut-off
valve by a motorized valve . 11

Foreword
This document (EN 126:2012/prA1:2014) 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 Amendment (see Annex BB) is supposed to replace EN 14459:2007, Annex L “Gas shut-off function”. In
addition to that EN 126:2012, Clause 3 and Clause 6 are modified accordingly.
Introduce the following three modifications to EN 126:2012:

1) Add the following after 3.106:

3.107
stored closing energy
SCE
energy available (even after interruption of the power supply) to move the closure member into the closed position
and keep it closed
3.108
shut-off valve
valve that opens and closes the gas flow other than automatic shut-off valves

2) Replace the text under 6.103.2 by the following:

Shall be according to Annex BB.

3) Introduction of the following normative Annex BB “Gas shut-off function” and the informative
Annex CC “Examples of new solutions” after the last Annex AA.
Annex BB
(normative)
Gas shut-off function
BB.1 Introduction
This Annex defines a method for assessing solutions for the gas shut-off function as well as requirements for
solutions other than those described in this document for use in gas appliances. In this document, the term safety
class A, class B and class C is not related to the sealing force classes. The sealing force shall be indicated in the
backpressure value as defined in EN 161 and as required in the relevant gas appliance standard. Those
requirements shall not be superseded by this annex.
Protection against fire and explosion in a gas appliance, as a result of uncontrolled gas flow, requires a safety
class C system for the gas shut-off function. This is based on a comparison, made between an automatic burner
controller and gas shut-off function, the safety class of each considered equal.
Today’s solutions (see Figure BB.1) according to this document, using two automatic shut-off valves, fulfil the
safety class C requirement even though they are not based on a fault assessment approach as specified in
EN 14459:2007, 6.6. This assumption is based on specific mechanical solutions originating from practice over
many years and as a principle relying on redundancy of two automatic shut-off valves, fulfilling the construction and
performance requirements of this document.

Key
1 burner control (BC)
Figure BB.1 — Standard solution with two valves
The approach of the above mentioned classifications can be used as a reference for assessing new solutions.
A safety class C shut-off function with only one shut-off valve is not acceptable.
New solutions of the gas shut-off function may consist of a combination of shut-off valves, electronic controller,
sensing elements, actuators, lock-out and reset as shown in Figure BB.2.
Key
1 automatic burner control (BC) 5 electronic controller for gas shut-off function
2 on/off 6 sensor
3 lockout 7 actuator
4 reset 8 mains supply
Figure BB.2 — Example of components in a new solution
BB.2 Classification
The gas shut-off function shall be safety class C.
BB.3 Construction requirements
BB.3.1 General
The constructional requirements are given in EN 14459:2007, Clause 6.
The sealing force and the closing time of the shut off valves shall be according to EN 161. The manufacturer shall
declare the type of Stored Energy (SCE), the sealing force and the closing time and shall give information to prove
that the sealing force will be maintained.
For a system with one of the shut-off valves being without Stored Closing Energy (SCE), when interfacing to the
burner control unit, a safety shut-down followed by lock-out signal of the burner control shall not lead to de-
energized terminals before the valve has closed. The manufacturer shall declare the interaction.
BB.3.2 Valve combinations
The safety class C gas shut-off function requires two shut-off valves, to ensure gas flow shut-off, with the remaining
valve, shall the other fail to close.
To fulfil the requirements of safety class C, and considering the method of assessment given in BB.6, additional
requirements shall be applied to those combinations of shut-off valves listed below using different types of SCE.
Informative examples are given in Annex CC.
BB.3.3 Two automatic shut-off valves
Both valves are automatic shut-off valves, no additional measures are required.
BB.3.4 One automatic shut-off and one shut-off valve with SCE
One automatic shut-off valve and one shut-off valve with SCE based on electronic components (EC) (e.g.
capacitor, battery) to close the valve after power interruption, this circuit has to be included in the fault assessment
according to BB.6.
BB.3.5 One automatic shut-off and one shut-off valve without SCE
One automatic shut-off valve and one shut-off valve with no SCE to close the valve after power interruption (e.g.
motorized actuator), additional measures are required according to BB.3.2. This combination can only be used for
non-permanent operations.
BB.3.6 Two shut-off valves with SCE
Two shut-off valves with SCE based on electronic components (EC) (e.g. capacitor, battery) to close the valve after
power interruption, additional measures are required according to BB.3.2 and fault assessment according to BB.6.
BB.3.7 One shut-off with SCE and one shut-off valve without SCE
One shut-off valve with SCE based on electronic components (EC) (e.g. capacitor, battery) and one shut-off valve
with no SCE to close the valve after power interruption (e.g. motorized actuator), additional measures are required
according to BB.3.2 and fault assessment according to BB.6. This combination shall only be used for applications
complying, at every start up, with EN 13611:2007+A2:2011, 6.6 in combination with a maximum operating time of
24 h between each start up.
BB.3.8 Two shut-off valves without SCE
The combination of two shut-off valves with no SCE to close the valve after power interruption (e.g. driven by a
motor) is not acceptable.
BB.4 Additional safety measures
BB.4.1 General
For valves that have no SCE a
...