1、BSI Standards PublicationBS ISO 23551-6:2014Safety and control devices for gas burners and gas-burning appliances ParticularrequirementsPart 6: Thermoelectric flame supervision controlsBS ISO 23551-6:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 23551-6:
2、2014.The UK participation 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
3、include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 79573 2ICS 27.060.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This B
4、ritish Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2014.Amendments issued since publicationDate Text affectedBS ISO 23551-6:2014 ISO 2014Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 6: The
5、rmoelectric flame supervision controlsDispositifs de commande et de scurit pour brleurs gaz et appareils gaz Exigences particulires Partie 6: quipements thermolectriques de surveillance de flammeINTERNATIONAL STANDARDISO23551-6First edition2014-08-15Reference numberISO 23551-6:2014(E)BS ISO 23551-6:
6、2014ISO 23551-6:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All 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
7、 the 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 officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.org
8、Web www.iso.orgPublished in SwitzerlandBS ISO 23551-6:2014ISO 23551-6:2014(E) ISO 2014 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Classification 24.1 Classes of controls 24.2 Groups of controls 25 Test conditions . 26
9、Construction 26.1 General . 26.2 Construction requirements 36.3 Materials . 36.4 Gas connections 47 Performance 57.1 General . 57.2 Leak-tightness 57.3 Torsion and bending 67.4 Rated flow rate 67.5 Durability . 67.6 Functional requirements 67.7 Endurance . 88 EMC/electrical requirements 99 Marking,
10、installation, and operating instructions 99.1 Marking . 99.2 Installation and operating instructions . 99.3 Warning notice . 10Annex A (informative) Leak-tightness test Volumetric method .11Annex B (informative) Leak-tightness test Pressure-loss method 12Annex C (normative) Conversion of pressure lo
11、ss into leakage rate .13Annex D (normative) Test for immunity to power-frequency magnetic fields14Annex E (normative) Specific regional requirements in European countries .15Annex F (normative) Specific regional requirements in Canada and USA .16Annex G (normative) Specific regional requirements in
12、Japan .17Annex H (informative) Types of flame supervision controls 18BS ISO 23551-6:2014ISO 23551-6:2014(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is nor
13、mally 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
14、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 th
15、e 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 docu
16、ment 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.or
17、g/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 ISOs adherence to the WTO p
18、rinciples in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 161, Control and protective devices for gas and/or oil burners and appliances.iv ISO 2014 All rights reservedBS ISO 23551-6:2014ISO 2355
19、1-6:2014(E)IntroductionThis part of ISO 23551 is designed to be used in combination with ISO 23550. This part, together with ISO 23550, establishes the full requirements as they apply to the product covered by this International Standard. This part adapts ISO 23550, where needed, by stating “with th
20、e 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, that are not already covered by ISO 23550, this International Standard might con
21、tain 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 fully International Standard, it has been necessary to take into consideration the differin
22、g 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
23、 intends to provide a basic framework of requirements that recognize these differences. ISO 2014 All rights reserved vBS ISO 23551-6:2014BS ISO 23551-6:2014Safety and control devices for gas burners and gas-burning appliances Particular requirements Part 6: Thermoelectric flame supervision controls1
24、 ScopeThis part of ISO 23551 specifies safety, constructional, and performance requirements for thermoelectric flame supervision controls, energized by a thermocouple, intended for use with gas burners and gas-burning appliances, hereafter referred to as “controls”.This part of ISO 23551 applies to
25、thermoelectric flame supervision controls for gas burners and gas-burning appliances of nominal connection size up to, and including DN 50, that can be used and tested independently of these appliances.These thermoelectric flame supervision controls are suitable for fuel gases, such as natural gas,
26、manufactured gas, or liquefied petroleum gas (LPG) at inlet pressures up to and including 50 kPa.This International Standard covers type testing only.This International Standard is not applicable toa) the thermocouple andb) controls which use auxiliary energy (e.g. electrical energy supplied externa
27、lly).2 Normative referencesThe following 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 a
28、mendments) applies.ISO 23550:2011, Safety and control devices for gas burners and gas-burning appliances General requirements3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 23550 and the following apply.3.101thermocouplethermoelectric flame sensing el
29、ement that responds to the temperature of the supervised flame, resulting in an electromotive force (e.m.f.)3.102thermoelectric flame supervision controlcontrol which, in response to the e.m.f. produced by the thermocouple, maintains the gas way to the main burner; or the main burner and the pilot b
30、urner open and which shuts off the gas way after extinction of the supervised flameNote 1 to entry: For example, see Figure AA.1.INTERNATIONAL STANDARD ISO 23551-6:2014(E) ISO 2014 All rights reserved 1BS ISO 23551-6:2014ISO 23551-6:2014(E)3.103ignition interlockpart which prevents the igniter from
31、operating as long as the main gas way is open3.104re-start interlockmechanism which prevents the re-opening of the gas way to the main burner or to the main burner and the pilot burner until the armature plate has separated from the magnetic elementNote 1 to entry: For further reference, see Figure
32、AA.1.3.105sealing forceforce acting on the closure member when the closure member is in the closed position, independent of any force provided by fuel gas pressure3.106closed positionposition of the closure member(s) in the absence of the thermoelectric energy4 Classification4.1 Classes of controlsI
33、SO 23550:2011, 4.1 is replaced by the following:Controls are classified according to the number of operations: 5 000 operations (e.g. central heating); 6 000 operations; 10 000 operations (e.g. space heaters); 40 000 operations (e.g. domestic cooking).NOTE Specific regional requirements are given in
34、 Annexes F and G.4.2 Groups of controlsShall be according to ISO 23550:2011, 4.2.NOTE Specific regional requirements are given in Annexes F and G.5 Test conditionsShall be according to ISO 23550:2011, Clause 5.6 Construction6.1 GeneralShall be according to ISO 23550:2011, 6.1, with the following add
35、ition: Controls shall also be designed, so that during ignition, either the gas way to the main burner is open, if there is no pilot burner; or the gas way to the main burner is closed and that to the pilot burner is open. Controls shall also be designed so that the sealing force is not decreased by
36、 the gas inlet pressure.2 ISO 2014 All rights reservedBS ISO 23551-6:2014ISO 23551-6:2014(E)6.2 Construction requirements6.2.1 AppearanceShall be according to ISO 23550:2011, 6.2.1.6.2.2 HolesShall be according to ISO 23550:2011, 6.2.2.6.2.3 Breather holesISO 23550:2011, 6.2.3 is not applicable.6.2.
37、4 Screwed fasteningsShall be according to ISO 23550:2011, 6.2.4.6.2.5 JointingShall be according to ISO 23550:2011, 6.2.5.6.2.6 Moving partsShall be according to ISO 23550:2011, 6.2.6.6.2.7 Sealing capsShall be according to ISO 23550:2011, 6.2.7.6.2.8 Dismantling and reassembling for servicing and/o
38、r adjustmentShall be according to ISO 23550:2011, 6.2.8.6.2.9 Auxiliary channelsShall be according to ISO 23550:2011, 6.2.9.6.3 Materials6.3.1 General material requirementsShall be according to ISO 23550:2011, 6.3.1.6.3.2 Housing6.3.2.1 Housing designShall be according to ISO 23550:2011, 6.3.2.1.6.3
39、.2.2 Test for leakage of housing after removal of non-metallic partsShall be according to ISO 23550:2011, 6.3.2.2 with the following addition:The test shall be performed in accordance with 7.2.2.2. ISO 2014 All rights reserved 3BS ISO 23551-6:2014ISO 23551-6:2014(E)6.3.3 SpringsShall be according to
40、 ISO 23550:2011, 6.3.3.6.3.4 Resistance to corrosion and surface protectionShall be according to ISO 23550:2011, 6.3.4.6.3.5 ImpregnationShall be according to ISO 23550:2011, 6.3.5.6.3.6 Seals for glands for moving partsShall be according to ISO 23550:2011, 6.3.6.6.4 Gas connections6.4.1 Making conn
41、ectionsShall be according to ISO 23550:2011, 6.4.1.6.4.2 Connection sizesShall be according to ISO 23550:2011, 6.4.2.6.4.3 ThreadsShall be according to ISO 23550:2011, 6.4.3.6.4.4 Union jointsShall be according to ISO 23550:2011, 6.4.4.6.4.5 FlangesShall be according to ISO 23550:2011, 6.4.5.6.4.6 C
42、ompression fittingsShall be according to ISO 23550:2011, 6.4.6.6.4.7 Nipples for pressure testsShall be according to ISO 23550:2011, 6.4.7.6.4.8 StrainersShall be according to ISO 23550:2011, 6.4.8 with the following addition:Strainers fitted to controls of DN 25 and above shall be accessible for cl
43、eaning or replacement without the need to remove the control body by dismantling threaded or welded pipe work.4 ISO 2014 All rights reservedBS ISO 23551-6:2014ISO 23551-6:2014(E)7 Performance7.1 GeneralShall be according to ISO 23550:2011, 7.1.7.2 Leak-tightness7.2.1 CriteriaISO 23550:2011, 7.2.1 is
44、 replaced by the following:Controls shall be leak-tight in accordance with the leakage rates given in Table 1.Table 1 Maximum leakage ratesGas connection nominal inlet size DNMaximum leakage rates of air cm3/hInternal leak-tightness External leak-tightnessClosed (de-energized) positionIgnition posit
45、ionOperating and closed (de-energized) positionIgnition positionDN 10 20 5 000 20 17010 DN 25 40 40 19025 DN 50 60 60 210Closure parts shall remain leak-tight after dismantling and reassembly.NOTE Specific regional requirements are given in Annexes F and G.7.2.2 Test for leak-tightness7.2.2.1 Genera
46、lShall be according to ISO 23550:2011, 7.2.2.1.7.2.2.2 External leak-tightnessShall be according to ISO 23550:2011, 7.2.2.2 with the following addition:Pressurize the inlet and outlet(s) of the control to the test pressures given in 7.2.2.1. Before the test, closure parts which can be dismantled in
47、accordance with 6.2.8 shall be dismantled and reassembled five times to the manufacturers instructions and the leakage rate for each of the mentioned conditions below is measured.a) The control shall be operated such that all closure members in the control are in the open position. Any of the electr
48、ical sources can be used during the test. The inlet and outlet(s) of the control shall then be pressurized to the test pressure according to 7.2.2.1.b) The test of a) shall then be carried out with the electrical source removed so that the main and pilot gas ways (for protected pilots) in the contro
49、l are closed.The test of a) shall then be repeated with any spindle moved during ignition and held in the ignition position.7.2.2.3 Internal leak-tightnessISO 23550:2011, 7.2.2.3 is replaced by the following: ISO 2014 All rights reserved 5BS ISO 23551-6:2014ISO 23551-6:2014(E)Closed positionTest in the closed position the leakage of the de-energized control in the direction of gas flow, at the test pressures given in 7.2.2.1 and measure the leakage rate. If there is more than one closure member in the control, the
