Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 8: Multifunctional controls

ISO 23551-8:2016 specifies the safety, construction and performance requirements for multifunctional controls intended for use with gas burners, gas appliances and similar use, hereafter referred to as "MFC". ISO 23551-8:2016 is applicable to MFC with declared maximum inlet pressures up to, and including, 50 kPa (500 mbar) of nominal connection sizes up to, and including, DN 150 for use with one or more fuel gases. MFC consist of two or more functions, at least one of which is a mechanical control, as specified in the relevant control standards.

Dispositifs de commande et de sécurité pour les brûleurs et les appareils à gaz — Exigences particulières — Partie 8: Equipements multifonctionnels

General Information

Status
Withdrawn
Publication Date
01-Feb-2016
Current Stage
9599 - Withdrawal of International Standard
Completion Date
11-May-2023
Ref Project

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INTERNATIONAL ISO
STANDARD 23551-8
First edition
2016-02-01
Safety and control devices for gas
burners and gas-burning appliances —
Particular requirements —
Part 8:
Multifunctional controls
Dispositifs de commande et de sécurité pour les brûleurs et les
appareils à gaz — Exigences particulières —
Partie 8: Equipements multifonctionnels
Reference number
ISO 23551-8:2016(E)
©
ISO 2016

---------------------- Page: 1 ----------------------
ISO 23551-8:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 23551-8:2016(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classes of control. 2
4.1 Classes of controls . 2
4.2 Groups of controls . 2
5 Test conditions . 2
6 Construction . 2
6.101 General . 2
6.102 MFC based on combination of controls . 3
6.102.1 General. 3
6.102.2 Interaction between Controls . 3
7 Performance . 3
7.101 General . 3
7.102 External leak-tightness of MFC . 3
7.103 Mechanical thermostat function . 4
7.104 Internal leak tightness of MFC . 4
7.105 Endurance test for combined functions . 4
8 EMC/electrical requirements . 4
9 Marking, installation and operating instructions . 4
9.1 Marking . 4
9.2 Installation and operating instructions . 4
9.3 Warning notice . 4
Annex AA (normative) Water operated gas valves . 5
Bibliography . 7
© ISO 2016 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 23551-8:2016(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 161, Control and protective devices for gas
and/or oil burners and appliances.
ISO 23551 consists of the following parts, under the general title Safety and control devices for gas
burners and gas-burning appliances — Particular requirements:
— Part 1: Automatic and semi-automatic valves
— Part 2: Pressure regulators
— Part 3: Gas/air ratio controls, pneumatic type
— Part 4: Valve-proving systems for automatic shut-off valves
— Part 5: Manual gas valves
— Part 6: Thermoelectric flame supervision controls
— Part 8: Multifunctional controls
— Part 9: Mechanical gas thermostats
— Part 10: Vent valves
iv © ISO 2016 – All rights reserved

---------------------- Page: 4 ----------------------
ISO 23551-8:2016(E)

Introduction
This part of ISO 23551 is designed to be used in combination with ISO 23550. Together, they establish
the full requirements as they apply to multifunctional controls. This part of ISO 23551 adapts
ISO 23550, where needed, by stating “with the following modification”, “with the following addition”,
“is replaced by the following” or “is not applicable” in the corresponding clauses. In order to identify
specific requirements that are particular to this part of ISO 23551 that are not already covered by
ISO 23550, this part of ISO 23551 may contain clauses or subclauses that are additional to the structure
of ISO 23550. These clauses are numbered starting from 101 or, in the case of an Annex, are designated
AA, BB, CC, etc.
It has been necessary to take into consideration the differing requirements resulting from practical
experience and installation practices in various regions of the world and to recognize the variation
in basic infrastructure associated with gas and/or oil controls and appliances. This part of ISO 23551
provides a basic framework of requirements that recognize these differences.
© ISO 2016 – All rights reserved v

---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 23551-8:2016(E)
Safety and control devices for gas burners and gas-burning
appliances — Particular requirements —
Part 8:
Multifunctional controls
1 Scope
This part of ISO 23551 specifies the safety, construction and performance requirements for
multifunctional controls intended for use with gas burners, gas appliances and similar use, hereafter
referred to as “MFC”.
This part of ISO 23551 is applicable to MFC with declared maximum inlet pressures up to, and
including, 50 kPa (500 mbar) of nominal connection sizes up to, and including, DN 150 for use with one
or more fuel gases.
MFC consist of two or more functions, at least one of which is a mechanical control, as specified in the
relevant control standards.
2 Normative references
The following referenced 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.
ISO 23550:2011, Safety and control devices for gas burners and gas-burning appliances — General
requirements
ISO 23551-1, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 1: Automatic and semi-automatic valves
ISO 23551-2, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 2: Pressure regulators
ISO 23551-3, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 3: Gas/air ratio controls, pneumatic type
ISO 23551-4, Safety and control devices for gas burners and gas-burnin
...

INTERNATIONAL ISO
STANDARD 23551-8
First edition
Safety and control devices for gas
burners and gas-burning appliances —
Particular requirements —
Part 8:
Multifunctional controls
Dispositifs de commande et de sécurité pour les brûleurs et les
appareils à gaz — Exigences particulières —
Partie 8: Equipements multifonctionnels
PROOF/ÉPREUVE
Reference number
ISO 23551-8:2015(E)
©
ISO 2015

---------------------- Page: 1 ----------------------
ISO 23551-8:2015(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 23551-8:2015(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classes of control. 2
4.1 Classes of controls . 2
4.2 Groups of controls . 2
5 Test conditions . 2
6 Construction . 2
6.101 General . 2
6.102 MFC based on combination of controls . 3
6.102.1 General. 3
6.102.2 Interaction between Controls . 3
7 Performance . 3
7.101 General . 3
7.102 External leak-tightness of MFC . 3
7.103 Mechanical thermostat function . 4
7.104 Internal leak tightness of MFC . 4
7.105 Endurance test for combined functions . 4
8 EMC/electrical requirements . 4
9 Marking, installation and operating instructions . 4
9.1 Marking . 4
9.2 Installation and operating instructions . 4
9.3 Warning notice . 4
Annex A (informative) Leak-tightness test — Volumetric method . 5
Annex B (informative) Leak-tightness test — Pressure-loss method . 6
Annex C (normative) Conversion of pressure loss into leakage rate . 7
Annex D (normative) Test for immunity to power-frequency magnetic fields.8
Annex E (normative) Specific regional requirements in European countries .9
Annex F (normative) Specific regional requirements in Canada and USA .10
Annex G (normative) Specific regional requirements in Japan .11
Annex AA (normative) Water operated gas valves .12
Bibliography .14
© ISO 2015 – All rights reserved PROOF/ÉPREUVE iii

---------------------- Page: 3 ----------------------
ISO 23551-8:2015(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 161, Control and protective devices for gas
and/or oil burners and appliances.
ISO 23551 consists of the following parts, under the general title Safety and control devices for gas
burners and gas-burning appliances — Particular requirements:
— Part 1: Automatic and semi-automatic valves
— Part 2: Pressure regulators
— Part 3: Gas/air ratio controls, pneumatic type
— Part 4: Valve-proving systems for automatic shut-off valves
— Part 5: Manual gas valves
— Part 6: Thermoelectric flame supervision controls
— Part 8: Multifunctional controls
— Part 9: Mechanical gas thermostats
— Part 10: Vent valves
iv PROOF/ÉPREUVE © ISO 2015 – All rights reserved

---------------------- Page: 4 ----------------------
ISO 23551-8:2015(E)

Introduction
This part of ISO 23551 is designed to be used in combination with ISO 23550. This part of ISO 23551,
together with ISO 23550, establishes the full requirements as they apply to the product covered by
this International Standard. This part of ISO 23551 adapts ISO 23550, where needed, by stating “with
the following modification”, “with the following addition”, “is replaced by the following” or “is not
applicable” in the corresponding clause. In order to identify specific requirements that are particular
to this part of ISO 23551 that are not already covered by ISO 23550, this part of ISO 23551 may contain
clauses or subclauses that are additional to the structure of ISO 23550. These clauses are numbered
starting from 101 or, in the case of an Annex, are designated AA, BB, CC, etc.
In an attempt to develop a full International Standard, it has been necessary to take into consideration
the differing requirements resulting from practical experience and installation practices in various
regions of the world and to recognize the variation in basic infrastructure associated with gas and/or
oil controls and appliances, some of which are addressed in Annexes E, F and G. This International
Standard intends to provide a basic framework of requirements that recognize these differences.
© ISO 2015 – All rights reserved PROOF/ÉPREUVE v

---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 23551-8:2015(E)
Safety and control devices for gas burners and gas-burning
appliances — Particular requirements —
Part 8:
Multifunctional controls
1 Scope
This part of ISO 23551 specifies the safety, construction and performance requirements for
multifunctional controls intended for use with gas burners, gas appliances and similar use, hereafter
referred to as “MFC”.
This part of ISO 23551 is applicable to MFC with declared maximum inlet pressures up to, and
including, 50 kPa (500 mbar) of nominal connection sizes up to, and including, DN 150 for use with one
or more fuel gases.
MFC consist of two or more functions, at least one of which is a mechanical control, as specified in the
relevant control standards.
2 Normative references
The following referenced 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.
ISO 23550:2011, Safety and control devices for gas burners and gas-burning appliances — General
requirements
ISO 23551-1, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 1: Automatic and semi-automatic valves
ISO 23551-2, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 2: Pressure regulators
ISO 23551-3, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 3: Gas/air ratio controls, pneumatic type
ISO 23551-4, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 4: Valve-proving systems for automatic shut-off valves
ISO 23551-5, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 5: Manual gas valves
ISO 23551-6, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 6: Thermoelectric flame supervision controls
ISO 23551-9, Safety and control devices for gas burners and gas-burning appliances — Particular
requirements — Part 9: Mechanical gas thermostats
ISO 23552-1, Safety and control devices for gas and/or oil burners and gas and/or oil appliances —
Particular requirements — Part 1: Fuel/air ratio controls, electronic type
IEC 60730-2-5, Automatic electrical controls — Part 2-5: Particular requirements for automatic electrical
burner control systems
© ISO 201
...

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