ISO INTERNATIONAL STANDARD 817 Third edition 2014-05-15 Refrigerants - Designation and safety classification Fluides frigorigenes-Designation et classification de sécurite Reference number IS0817:2014(E) LSO IS02014 IS0817:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ISO 2014 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 Casepostale56.CH-1211Geneva20 Tel.+41227490111 Fax+41227490947 E-mail copyright@iso.org Web www.iso.org Published in Switzerland ii @ IS0 2014 -All rights reserved CoovriahtInt IS0 817:2014(E) Contents Page Foreword .iv Introduction. .V 1 Scope. 2 Normativereferences ..1 3 Terms,definitions,abbreviatedtermsand symbols .1 3.1 Terms anddefinitions .1 3.2 Abbreviated terms .6 3.3 Symbols 7 4 Numbering of refrigerants .7 5 Designation prefixes .11 5.1 General prefixes .11 5.2 Composition-designating prefixes 11 Safety classifications .12 6.1 General .12 6.2 Matrix diagram of safetygroupclassification system ..14 Refrigerantclassifications ..14 8 Refrigerantconcentration limit (RCL) .14 8.1 General .14 8.2 Data for calculations. .17 8.3 Contaminantsand impurities. .18 8.4 ConversionofunitsVolumicmassandaltitudeadjustment .18 AnnexA(informative)Examplesofisomerdesignation ..25 AnnexB (normative)Detailsoftestingforflammabilityand fractionation analysis ..27 Annex C (informative) Method of test for burning velocity measurement of flammable gases .31 AnnexD(normative)CalculationofRCLandATELforblends .54 AnnexE (informative)Data usedtodetermine safetyclassification andRCLvaluesand datafor unclassified refrigerants. .57 AnnexF (normative)Applicationinstructions .65 Bibliography .72 isn to Sandardzaln rights reserved ii