1、BSI Standards PublicationBS ISO 23551-8:2016Safety and control devices for gas burners and gas-burning appliances Particular requirementsPart 8: Multifunctional controlsBS ISO 23551-8:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 23551-8:2016.The UK part
2、icipation in its preparation was entrusted to TechnicalCommittee GSE/22, Safety and control devices for gas and oilburners and gas burning appliances.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the
3、necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 88079 7ICS 27.060.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard
4、was published under the authority of theStandards Policy and Strategy Committee on 29 February 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 23551-8:2016 ISO 2016Safety and control devices for gas burners and gas-burning appliances Particular requirements Part
5、 8: Multifunctional controlsDispositifs de commande et de scurit pour les brleurs et les appareils gaz Exigences particulires Partie 8: Equipements multifonctionnelsINTERNATIONAL STANDARDISO23551-8First edition2016-02-01Reference numberISO 23551-8:2016(E)BS ISO 23551-8:2016ISO 23551-8:2016(E)ii ISO
6、2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll 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
7、 internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47
8、copyrightiso.orgwww.iso.orgBS ISO 23551-8:2016ISO 23551-8:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 24 Classes of control 24.1 Classes of controls 24.2 Groups of controls 25 Test conditions . 26 Construction 26.101 General . 26.102 MFC based on comb
9、ination of controls . 36.102.1 General 36.102.2 Interaction between Controls . 37 Performance 37.101 General . 37.102 External leak-tightness of MFC . 37.103 Mechanical thermostat function 47.104 Internal leak tightness of MFC . 47.105 Endurance test for combined functions 48 EMC/electrical requirem
10、ents 49 Marking, installation and operating instructions 49.1 Marking . 49.2 Installation and operating instructions . 49.3 Warning notice 4Annex AA (normative) Water operated gas valves . 5Bibliography 7 ISO 2016 All rights reserved iiiContents PageBS ISO 23551-8:2016ISO 23551-8:2016(E)ForewordISO
11、(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 comm
12、ittee 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 electrote
13、chnical 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 drafte
14、d 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 right
15、s. 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 constitut
16、e an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committ
17、ee 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
18、 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 thermo
19、stats Part 10: Vent valvesiv ISO 2016 All rights reservedBS ISO 23551-8:2016ISO 23551-8:2016(E)IntroductionThis 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 ada
20、pts 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
21、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 re
22、quirements 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 th
23、ese differences. ISO 2016 All rights reserved vBS ISO 23551-8:2016BS ISO 23551-8:2016Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 8: Multifunctional controls1 ScopeThis part of ISO 23551 specifies the safety, construction and performance requirem
24、ents 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 includi
25、ng, 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 referencesThe following referenced documents, in whole or in part, are normatively referenced in this documen
26、t 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 re
27、quirementsISO 23551-1, Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 1: Automatic and semi-automatic valvesISO 23551-2, Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 2: Pressure regulatorsISO 23
28、551-3, Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 3: Gas/air ratio controls, pneumatic typeISO 23551-4, Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 4: Valve-proving systems for automatic sh
29、ut-off valvesISO 23551-5, Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 5: Manual gas valvesISO 23551-6, Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 6: Thermoelectric flame supervision control
30、sISO 23551-9, Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 9: Mechanical gas thermostatsISO 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, elec
31、tronic typeIEC 60730-2-5, Automatic electrical controls Part 2-5: Particular requirements for automatic electrical burner control systemsINTERNATIONAL STANDARD ISO 23551-8:2016(E) ISO 2016 All rights reserved 1BS ISO 23551-8:2016ISO 23551-8:2016(E)3 Terms and definitionsFor the purpose of this docum
32、ent, the terms and definitions given in ISO 23550:2011 and the following apply.3.101multifunctional controlcombination of two or more controls, at least one of this is a mechanical control, whereby the functional parts cannot operate if separated3.102closing mechanismpart of the actuating mechanism
33、that operates the closure member to the closed position guaranteeing the gas shut-off function with the required tightness3.103water operated gas valvedevice that uses flow of water to control the flow of gas4 Classes of control4.1 Classes of controlsShall be according to ISO 23550:2011, 4.1.4.2 Gro
34、ups of controlsShall be according to ISO 23550:2011, 4.2.5 Test conditionsShall be according to ISO 23550:2011, Clause 5.6 ConstructionISO 23550:2011, Clause 6 is replaced by the following.6.101 GeneralMFC consist of a combination of controls according to 6.102.Requirements for construction of the c
35、ontrols incorporated in the MFC are covered in the relevant control standards. Where no control standard is available, the requirements of ISO 23550:2011 are applicable.In addition, this part of ISO 23551 covers in 6.102.2 requirements for the safety related interactions between the different functi
36、ons of the MFC.Where there are no requirements for these interactions between two or more controls, a risk assessment shall be performed. MFCs shall be designed such that access to internal parts requires the use of tools.2 ISO 2016 All rights reservedBS ISO 23551-8:2016ISO 23551-8:2016(E)6.102 MFC
37、based on combination of controls6.102.1 GeneralMFC are based on a combination of the functionality provided by the controls as given by the following list: automatic shut-off valves according to ISO 23551-1; pressure regulators according to ISO 23551-2; pneumatic gas/air ratio controls according to
38、ISO 23551-3; valve proving systems according to ISO 23551-4; manual gas valves according to ISO 23551-5; thermo electric flame supervision devices according to ISO 23551-6; mechanical gas thermostats according to ISO 23551-9; electronic fuel/air ratio controls according to ISO 23552-1; automatic ele
39、ctrical burner control system according to IEC 60730-2-5; water operated gas valves according to Annex AA.6.102.2 Interaction between Controls6.102.2.1 Closing mechanism for closure memberEach automatic shut-off valve shall consist of a separate, independent closing mechanism controlling only one cl
40、osure member. A check of internal leak-tightness shall be possible on each of the automatic shut-off valves. If two or more closure members are controlled by one closing mechanism, the valve is considered as one automatic shut-off valve.6.102.2.2 Interactions between functionsThe interactions betwee
41、n the functions of the MFC shall not interfere with the safety of the individual functions. Mechanical functions shall not affect the safety of electronic functions and vice versa.7 PerformanceISO 23550:2011, Clause 7 is replaced by the following.7.101 GeneralRequirements for performance of MFC are
42、covered in the relevant control standards (see list in 6.102.1). Where no control standard is available, the requirements of ISO 23550:2011 are applicable.7.102 External leak-tightness of MFCMFC shall be leak-tight in accordance with the leakage rate given in Table 1. The test is performed according
43、 to ISO 23550:2011, 7.2.2.1 and 7.2.2.2. ISO 2016 All rights reserved 3BS ISO 23551-8:2016ISO 23551-8:2016(E)Table 1 External leakage rateNominal inlet sizeDNExternal leakage ratescm3/h of airDN 10 6010 DN 1207.103 Mechanical thermostat functionIf the MFC incorporates an independent mechanical therm
44、ostat function and a pressure regulator, the pressure regulator shall be put out of action for the tests of the thermostat function.7.104 Internal leak tightness of MFCThe leak-tightness of the closure member(s) of each function shall be tested independently.7.105 Endurance test for combined functio
45、nsFor MFC which uses a single closure member to perform more than one function, the test conditions and number of cycles for endurance testing shall be applied by the function having the most severe combination.8 EMC/electrical requirementsShall be according to ISO 23550:2011, Clause 8.9 Marking, in
46、stallation and operating instructions9.1 MarkingISO 23550:2011, 9.1 is replaced by the following.Marking of MFC are covered in the relevant control standards as listed under 6.101 and 6.102.1.9.2 Installation and operating instructionsShall be according to ISO 23550:2011, 9.2 with the following addi
47、tion.Instructions of MFC are covered in the relevant control standards as listed under 6.102.1.They shall include all the information of the relevant control standard on use, installation, operation and servicing. Furthermore, they shall also include the following:a) gas, and if applicable, water co
48、nnection(s);b) a statement to the effect that the functions of the MFC have to be verified as being suitable for their application;c) if applicable, maximum water pressure (see AA.2);d) if applicable, water flow to open and to close the water operated gas valve;9.3 Warning noticeShall be according t
49、o ISO 23550:2011, 9.3.4 ISO 2016 All rights reservedBS ISO 23551-8:2016ISO 23551-8:2016(E)Annex AA (normative) Water operated gas valvesAA.1 GeneralThis Annex is applicable to the specific requirements of an MFC that incorporates a water operated gas valve function. MFC that incorporates a water operated gas valve shall comply with the additional requirements given under AA.2.Only the affected subclauses are mentioned in this Annex, hence, the numbering is non-consecutive.AA.2 Addi
