ISO INTERNATIONAL STANDARD 23551-4 Second edition 2018-04 Safety and control devices for gas burners and gas-burning appliances - Particular requirements - Part 4: Valve-proving systems for automatic shut-off valves Dispositifs de controle et de sécurite pour les braleurs a gaz et pour lesappareilsutilisantlegaz-Exigencesparticulieres Partie4:Systemes de controled'étancheitepourrobinets automatiquesdesectionnement Reference number IS0 23551-4:2018(E) ISO @ IS0 2018 IS023551-4:2018(E) COPYRIGHTPROTECTEDDOCUMENT IS02018 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 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 0111 Fax: +41 22 749 09 47 Email:copyright@iso.org Website: www.iso.org Published in Switzerland ii IS02018-Allrights reserved IS023551-4:2018(E) Contents Page Foreword V Introduction .vi 1 Scope. .1 2 Normativereferences .1 3 Terms and definitions .1 4 Classification .3 4.1 Classes of control 3 4.2 Groups of controls 3 4.3 Types of DC supplied controls 3 4.4 Classesofcontrolfunctions. 3 5 Testconditionsandtolerances .3 6 Construction. .3 6.1 General. 3 6.2 Construction requirements. 3 6.3 Materials. 4 6.4 Gas connections. 4 6.5 Gas controls employing electrical components in the gas way 4 6.6 Electronic parts ofthe control 4 6.7 Additionalconstructional requirements for VPS systems 4 6.7.1 Signal for indication 4 VPS setting. 6.7.2 4 7 Performance. 4 7.1 General. 4 7.2 Leak tightness 4 7.2.1 General. 4 7.2.2 Requirements 4 7.2.3 Test. 5 7.3 Torsion and bending 5 7.4 Rated flow rate. 5 7.5 Durability 6 7.6 Functional requirements 6 7.6.1 Manufacturerinformation 6 7.6.2 Detection limit 6 7.6.3 Programme sequence 6 7.6.4 Timing 6 7.6.5 Test of the programme sequence and timing 7 7.6.6 Self-checking 7 7.6.7 Lock-out function 7 7.6.8 Mainspower interruption 8 7.7 Endurance. 8 7.7.1 General. 8 7.7.2 Stress test 8 7.8 Vibration test. 9 7.9 Performance testsforelectronic controls 9 7.9.1 Atambienttemperature 10 7.9.2 Atlowtemperature. 10 7.9.3 At high temperature. 10 8 Electrical equipment .10 8.1 General. .10 8.2 Requirements .10 8.3 Test. .10 @ IS0 2018 - All rights reserved iii