1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 921 Commercial Dishwashers STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED
2、 FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Commercial Dishwashers,UL 921 Seventh Edition, Dated March 23, 2016 Summary of Topics The seventh edition of the Standard for Commercial Dishwashers, UL 921, includes the addition of Supplement Section fo
3、r Commercial Dishwashers Incorporating Self-Contained Condensing Systems The new requirements are substantially in accordance with Proposal(s) on this subject dated October 2, 2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in an
4、y form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpos
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7、any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. MARCH 23, 2016 UL 921 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FUR
8、THER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARCH 23, 2016 UL 921 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CSA Group CSA C22.2 No. 16816 Second Edition CSA America ANSI Z83.212016 Second Editio
9、n Underwriters Laboratories Inc. UL 921 Seventh Edition Commercial Dishwashers March 23, 2016 ANSI/UL 921-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Commitment for Amendments This standard is issued jointly by Canadian Standards Ass
10、ociation (operating as “CSA Group”) and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to CSA Group or UL at any time. Revisions to this standard will be made only after processing according to the standards development procedure
11、s of CSA Group and UL. CSA Group and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue. ISBN 9781488301100 2016 CSA Group All rights reserved. No part of this publication may be reproduced in any form whatsoever without the
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15、ve property of UL. This ANSI/UL Standard for Safety consists of the Seventh Edition including revisions through March 23, 2016. The most recent designation of ANSI/UL 921 as an American National Standard (ANSI) occurred on March 23, 2016. ANSI approval for a standard does not include the Cover Page,
16、 Transmittal Pages, Title Page (front and back), or the Preface. The Department of Defense (DoD) has adopted UL 921 on June 18, 1992. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for revisions on any part of the Standa
17、rd may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. To purchase UL Standards, visit Comm 2000 at http:/m- or call toll-free 1-888-853-3503.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FU
18、RTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS PREFACE 6 1 Scope .8 2 General 8 2.1 Components .8 2.2 Units of measurement .9 2.3 Reference publications 9 2.4 General requirements 13 3 Denitions 13 4 Construction Requirements Applicable To All Dishwashers 16 4.1 General 16 4.
19、2 Field-attached accessories .19 4.3 Doors and covers .20 4.4 Accessibility of current-carrying parts 20 4.5 Corrosion protection .22 4.6 Mechanical assembly 22 4.7 Power-supply connections 23 4.8 Current-carrying parts 26 4.9 Internal wiring .27 4.10 Separation of circuits .29 4.11 Insulating mater
20、ials .29 4.12 Thermal insulation .30 4.13 Equipment grounding and bonding .31 4.14 Lampholders 32 4.15 Receptacles .32 4.16 Capacitors 33 4.17 Overcurrent- or overload-protective devices .34 4.18 Overcurrent and overload protection for motors 34 4.19 Overcurrent protection for transformers .35 4.20
21、Overcurrent protection for conductors .36 4.21 Switches .37 4.22 Controls .37 4.23 Spacings 39 4.24 Seals and gaskets 41 4.25 Moisture condensation .41 5 Construction Requirements Unique To Gas-Fired Dishwashers 41 5.1 General 41 5.2 Manually-operated gas valves .43 5.3 Automatic valves and safety s
22、hutoff valves .44 5.4 Gas pressure regulators 44 5.5 Ignition systems .44 5.6 Pilot-gas lters 46 5.7 Gas supply line .46 5.8 Semi-rigid tubing 47 6 Reduction Of Risk Of Injury To Persons Requirements Applicable To All Dishwashers .47 6.1 Enclosure and guards 47 6.2 Automatic restarting of motor .48
23、6.3 Parts subject to air or steam pressure .48 6.4 Pressure-relief devices .49 7 Performance Requirements Applicable To All Dishwashers .49 MARCH 23, 2016 CSA C22.2 NO. 16816 ANSI Z83.212016 UL 921 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FR
24、OM UL 7.1 General 49 7.2 Electrical input test 50 7.3 Starting current test 50 7.4 Normal temperature test 51 7.5 Temperature measuring equipment and enclosure setup .52 7.6 Dielectric voltage-withstand test .54 7.7 Flexing test .55 7.8 Insulation resistance following humidity conditioning test .56
25、7.9 Water exposure tests 56 7.10 Flooding of current-carrying parts test .58 7.11 Hydrostatic pressure test 59 7.12 Reservoir overow test 59 7.13 Liquid containers, seals, and diaphragms tests .60 7.14 Limited short-circuit test (motor protection) 60 7.15 Abnormal operation test .61 7.16 Blocked plu
26、nger test 61 7.17 Overvoltage for electrolytic capacitors test 62 7.18 Overload on switches test .62 7.19 Transformer overcurrent protection test .63 7.20 Transformer burnout test 63 7.21 Door interlock endurance test 64 7.22 Loading door/drawer moment load test 64 7.23 Strain relief test 64 7.24 Pu
27、sh-back relief test 64 8 Performance Requirements Unique To Electrically-Heated Dishwashers 64 8.1 Automatic temperature control tests .64 9 Performance Requirements Unique To Gas-Fired Dishwashers 65 9.1 General 65 9.2 Test gases .67 9.3 Test pressures and burner adjustments test 67 9.4 Normal oper
28、ation combustion test .67 9.5 Undervoltage combustion test .68 9.6 Combustion air failure test 68 9.7 Burner operating characteristics test .69 9.8 Pilot ignition systems test .70 9.9 Direct ignition systems tests 75 9.10 Flue gas temperature for draft hood appliances test 77 10 Manufacturing And Pr
29、oduction Tests Unique To Electrically-Heated Dishwashers .77 10.1 Production line dielectric voltage-withstand test 77 10.2 Production line grounding continuity test 79 11 Manufacturing And Production Tests Unique To Gas-Fired Dishwashers 79 12 Rating Requirements Applicable To All Dishwashers 79 13
30、 Marking Requirements Applicable To All Dishwashers .80 14 Marking Requirements Unique To Electrically-Heated Dishwashers .80 15 Marking Requirements Unique To Gas-Fired Dishwashers .83 16 Installation Instructions Applicable to All Dishwashers .84 17 Installation Instruction Requirements Unique to
31、Electrically-Heated Dishwashers .84 18 Installation Instruction Requirements Unique To Gas-Fired Dishwashers 84 MARCH 23, 2016 CSA C22.2 NO. 16816 ANSI Z83.212016 UL 921 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SUPPLEMENT SA - COMMER
32、CIAL DISHWASHERS SELF-CONTAINED CONDENSING SYSTEMS INTRODUCTION SA1 Scope 101 CONSTRUCTION SA2 Condenser Tubing and Fittings 101 SA3 Pressure Relief 102 SA3.1 General 102 PERFORMANCE SA4 Heat Load Calculation Test (United States Only) .102 SA5 Strength Tests Pressure-Containing Components 104 MARKIN
33、GS SA6 General (United States Only) 105 APPENDIX A Standards for Components APPENDIX B Marking French Translations MARCH 23, 2016 CSA C22.2 NO. 16816 ANSI Z83.212016 UL 921 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PREFACE This is the
34、 common CSA Group, and UL standard for Commercial Dishwashers. It is the Second edition of CSA C22.2 No. 168, the Second edition of ANSI/ CSA Z83.21, and the Seventh edition of UL 921. This edition of CSA C22.2 No. 168, ANSI/ CSA Z83.21, supersedes the previous edition published in 2006. This editio
35、n of UL 921 supersedes the previous edition(s) published on January 31, 2006. This harmonized standard was prepared by CSA Group and Underwriters Laboratories Inc. (UL). The efforts and support of the Z83/CSA Joint Technical Subcommittee on Standards for Gas Food Service Equipment, and representativ
36、es of the commercial dishwasher industry in Canada and the United Stated for developing this harmonized standard are gratefully acknowledged. Major changes in this edition are the addition of Supplement SA COMMERCIAL DISHWASHERS SELF-CONTAINED CONDENSING SYSTEMS, updating the reference documents and
37、 reformatting to latest editorial guidelines. This standard is considered suitable for use for conformity assessment within the stated scope of the standard. This standard was reviewed by the Z83/CSA Joint Technical Subcommittee on Standards for Gas Food Service Equipment under the jurisdiction of t
38、he Technical Committee on Performance and Installation of Gas Burning Appliances and Related Accessories and the Strategic Steering Committee on Standards for Gas Burning Appliances and Related Accessories, and has been formally approved by the Z21/83 and CSA Technical Committees, American National
39、Standards Institute, and the Interprovincial Gas Advisory Council. This standard was also reviewed by the CSA Subcommittee on Electrical Motor-Operated Cleaning Appliances for Commercial Use, under the jurisdiction of the CSA Technical Committee on Consumer and Commercial Products, the CSA Strategic
40、 Steering Committee on requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee. This standard has been approved by the American National Standards Institute (ANSI) as an American National Standard. Application of Standard Where reference is made to a specic
41、number of samples to be tested, the specied number is to be considered a minimum quantity. Note: Although the intended primary application of this standard is stated in its scope, it is important to note that it remains the responsibility of the users of the standard to judge its suitability for the
42、ir particular purpose. Level of Harmonization This standard is published as an identical standard for CSA Group and UL. An identical standard is a standard that is exactly the same in technical content except for national differences resulting from conicts in codes and governmental regulations. Pres
43、entation is word for word except for editorial changes. MARCH 23, 2016 CSA C22.2 NO. 16816 ANSI Z83.212016 UL 921 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Reasons for Differences From IEC There is no corresponding IEC standard. Inter
44、pretations The interpretation by the standards development organization of an identical or equivalent standard is based on the literal text to determine compliance with the standard in accordance with the procedural rules of the standards development organization. If more than one interpretation of
45、the literal text has been identied, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reect the intent. MARCH 23, 2016 CSA C22.2 NO. 16816 ANSI Z83.212016 UL 921 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR D
46、ISTRIBUTION WITHOUT PERMISSION FROM UL Commercial Dishwashers 1 Scope 1.1 This Standard covers commercial, freestanding, under-counter, and counter-insert dishwashers, utensil-washers, and glass washers using water as the principal cleaning medium, hereafter referred to as dishwashers. These dishwas
47、hers utilize steam, gas, or electric heaters for heating the water. Heated water is provided to a dishwasher by means of steam, gas, or electric heating systems integral to the appliance, or by means not integral to the dishwasher that is provided at the installation site. 1.2 This Standard covers:
48、a) electric dishwashers rated 600 V or less, installed in accordance with the Canadian Electrical Code (CEC), Part 1, CSA C22.1, and the National Electrical Code (NEC), NFPA 70; and b) the gas-handling, gas-burning, and gas-control features of gas-red dishwashers having inputs of 400,000 Btu (420 MJ
49、) per hour or less, limited to 0.5 psig (3.45 kPa) inlet pressure, installed in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54, the International Fuel Gas Code, ICC IFGC, or the Natural Gas and Propane Installation Code, CSA B149.1 for use with: 1) natural gas; 2) manufactured gas; 3) mixed gas; 4) propane gas; 5) liqueed petroleum gases; or 6) LP gas-air mixtures. 1.3 These requirements cover dishwashers intended for use
