ISO 23551-8:2016/Amd 1:2019
(Amendment)Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 8: Multifunctional controls — Amendment 1: Overheating safety devices
Safety and control devices for gas burners and gas-burning appliances — Particular requirements — Part 8: Multifunctional controls — Amendment 1: Overheating safety devices
Dispositifs de commande et de sécurité pour les brûleurs et les appareils à gaz — Exigences particulières — Partie 8: Equipements multifonctionnels — Amendement 1: Dispositifs de sécurité contre les surchauffes
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INTERNATIONAL ISO
STANDARD 23551-8
First edition
2016-02-01
AMENDMENT 1
2019-06
Safety and control devices for gas
burners and gas-burning appliances —
Particular requirements —
Part 8:
Multifunctional controls
AMENDMENT 1: Overheating safety
devices
Dispositifs de commande et de sécurité pour les brûleurs et les
appareils à gaz — Exigences particulières —
Partie 8: Equipements multifonctionnels
AMENDEMENT 1: Dispositifs de sécurité contre les surchauffes
Reference number
ISO 23551-8:2016/Amd.1:2019(E)
©
ISO 2019
ISO 23551-8:2016/Amd.1:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
ISO 23551-8:2016/Amd.1:2019(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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 161, Controls and protective devices for
gas and/or oil.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
ISO 23551-8:2016/Amd.1:2019(E)
Safety and control devices for gas burners and gas-burning
appliances — Particular requirements —
Part 8:
Multifunctional controls
AMENDMENT 1: Overheating safety devices
Clause 1, Scope
Add the following paragraph after the last paragraph:
This part of ISO 23551 is also applicable to:
— water operated gas valves (see Annex AA); and
— OSDs according to Annex BB.
Clause 3
Add the following entries:
3.104
overheating safety device
OSD
temperature-sensing device which is intended to keep temperature below one particular value during
abnormal operating conditions of the appliance and which has no provision for setting by the end user
Note 1 to entry: These devices usually use a thermistor or a bimetal sensing part (element).
3.105
sensing part
part of the OSD which is intended to be exposed to the influences of the activating quantity to which the
automatic action of a sensing control responds
Note 1 to entry: Examples of OSDs are shown in Figure 1.
ISO 23551-8:2016/Amd.1:2019(E)
Example a) Example b)
Key
1 thermo-electric flame supervision control 4 sensor
2 burner 5 object to be measured (heated by burner)
3 gas shut-off valve 6 burner control unit
Figure 1 — Examples of OSDs
3.106
overheating temperature
temperature at which the OSD functions to turn off the gas supply to the burner during abnormal
operating conditions of the appliance
3.107
thermistor
thermally sensitive semiconductor resistor, which shows over at least part of its resistance/temperature
(R/T) characteristic a significant non-linear change in its
...
INTERNATIONAL ISO
STANDARD 23551-8
First edition
2016-02-01
AMENDMENT 1
2019-06
Safety and control devices for gas
burners and gas-burning appliances —
Particular requirements —
Part 8:
Multifunctional controls
AMENDMENT 1: Overheating safety
devices
Dispositifs de commande et de sécurité pour les brûleurs et les
appareils à gaz — Exigences particulières —
Partie 8: Equipements multifonctionnels
AMENDEMENT 1: Dispositifs de sécurité contre les surchauffes
Reference number
ISO 23551-8:2016/Amd.1:2019(E)
©
ISO 2019
ISO 23551-8:2016/Amd.1:2019(E)
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
ISO 23551-8:2016/Amd.1:2019(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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 161, Controls and protective devices for
gas and/or oil.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
ISO 23551-8:2016/Amd.1:2019(E)
Safety and control devices for gas burners and gas-burning
appliances — Particular requirements —
Part 8:
Multifunctional controls
AMENDMENT 1: Overheating safety devices
Clause 1, Scope
Add the following paragraph after the last paragraph:
This part of ISO 23551 is also applicable to:
— water operated gas valves (see Annex AA); and
— OSDs according to Annex BB.
Clause 3
Add the following entries:
3.104
overheating safety device
OSD
temperature-sensing device which is intended to keep temperature below one particular value during
abnormal operating conditions of the appliance and which has no provision for setting by the end user
Note 1 to entry: These devices usually use a thermistor or a bimetal sensing part (element).
3.105
sensing part
part of the OSD which is intended to be exposed to the influences of the activating quantity to which the
automatic action of a sensing control responds
Note 1 to entry: Examples of OSDs are shown in Figure 1.
ISO 23551-8:2016/Amd.1:2019(E)
Example a) Example b)
Key
1 thermo-electric flame supervision control 4 sensor
2 burner 5 object to be measured (heated by burner)
3 gas shut-off valve 6 burner control unit
Figure 1 — Examples of OSDs
3.106
overheating temperature
temperature at which the OSD functions to turn off the gas supply to the burner during abnormal
operating conditions of the appliance
3.107
thermistor
thermally sensitive semiconductor resistor, which shows over at least part of its resistance/temperature
(R/T) characteristic a significant non-linear change in its
...
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