ISO/TS TECHNICAL SPECIFICATION 21364-21 First edition 2021-05 Domestic gas cooking appliances - Safety - Part 21: Particular requirements for gas hobs, gas grills and gas griddles Appareilsde cuissondomestiques utilisant les combustiblesgazeux- Sécurité- Partie 21: Exigences particulieres pour les tables de cuisson d gaz, grilsagazetgrilsparcontactagaz Referencenumber IS0/TS 21364-21:2021(E) ISO @ISO2021 IS0/TS 21364-21:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 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 below or Iso's memberbody in the country ofthe requester. ISO copyright office CP 40i : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22.749 01 11 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved IS0/TS21364-21:2021(E) Contents Page Foreword ..vi Introduction. ..vii 1 Scope. 2 Normative references 2 3 Terms and definitions 3.1 Definitionsrelatingtocomponents .2 22 4 Components in gas cooking appliances 4.1 General. 4.2 Manual gas shut-off valves (Taps). 23 4.2.1 Taps for multi-ring burners 4.3 Knobs. 3 .3 4.3.1 Design of knobs. 4.4 Multifunctional controls 3 4.5 Thermoelectric flame supervision controls 3 3 4.6 Thermostats 4.7 Pressure regulators.. 33 4.8 Automatic shut-offvalves 4.9 3 Injectors and adjusters .3 4.10 Ignition systems 4.11 Thermal cut-outs. .3 .3 4.12 Multi-ring burners 4.13 Overheatingsafetydevices 4 4.13.1 Requirement. ..4 4.13.2 Test. .5 5 General conditions oftest .5 6 Heat input .5 6.1 General ..5 6.2 Obtaining the nominal heatinput .5 6.2.1 Test of hob burner .5 6.2.2 Test of multi-ringhob burner .6 6.2.3 Test of surface grill and griddle without a thermostat 6 6.2.4 Test of surfacegrill and griddle with a thermostat .6 6.3 Measurements and calculations. .6 6.4 Obtaining the reduced heat input. 6.4.1 Requirement .6 6.4.2 Test. 6.4.3 Test of hob burner, surface grill and griddle burner 6 6.5 Total heat input. .7 1 Heating. 7 7.1 General. .7 7.2 .1 Operating conditions 7.3 Heating tests. .7 7.4 Abnormal operation. .7 7.4.1 Hob burner. 7 7.4.2 .7 Gas griddles 8 Combustion .8 8.1 Measurementofall burners simultaneously .8 8.2 Blocked combustion products outlet .8 .8 8.3 Analysis of the combustion products 8.4 Single burner.. .8 8.4.1 General requirement @ IS0 2021 -All rights reserved iii