UL 621-2010 UL Standard for Safety Ice Cream Makers (Seventh Edition reprint with revisions through and including March 1 2018)《冰激淋机》.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 621 Ice Cream MakersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION

2、OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Ice Cream Makers, UL 621 Seventh Edition, Dated May 7, 2010 SUMMARY OF TOPICS The following revisions to ANSI/UL 621 have been made: 1. Revisions for general requirements regarding components 2. Revisions for specic requirements r

3、egarding components 3. Revisions for requirements regarding refrigerant tubing 4. Revisions to incorporate operating control, protective control parameter, and safety critical function requirements 5. Revisions for motor and motor overload protection requirements 6. Miscellaneous revisions including

4、 updated standard references, thermal equilibrium requirements, clarication of Table 31.2, and removal of R-22 references Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a v

5、ertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated June 26, 2015. All rights r

6、eserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any 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 o

7、r implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of

8、 the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electron

9、ic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against 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

10、on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that

11、 have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. DECEMBER 11, 2015 UL 621 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 11, 2015 UL 6

12、21 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL May 7, 2010 (Title Page Reprinted: December 11, 2015) 1 UL 621 Standard for Ice Cream Makers The First and Second editions were titled Ice Cream Freezers and Soda Fou

13、ntain Units. First Edition January, 1961 Second Edition April, 1973 Third Edition April, 1977 Fourth Edition April, 1986 Fifth Edition March, 1993 Sixth Edition May, 2005 Seventh Edition May 7, 2010 This ANSI/UL Standard for Safety consists of the Seventh Edition including revisions through December

14、 11, 2015. The most recent designation of ANSI/UL 621 as an American National Standard (ANSI) occurred on December 10, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. The Department of Defense (DoD) has adopted UL 621

15、on February 25, 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 Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Colla

16、borative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole an

17、d exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 621-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 11, 2015 ICE CREAM MAKERS - UL 621 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZE

18、D FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 General 6 2.1 Terminology .6 2.2 Components .6 2.3 Units of measurement .6 2.4 Undated references .7 3 Glossary .7 3A Denitions Relating To Classes Of Control Functions .8A CONSTRUCTION 4 General

19、 8A 5 Assembly .8B 5.1 General 8B 5.2 Pressurized product system 9 5.3 Mechanical protection .9 6 Accessibility Of Uninsulated Live Parts, Film-Coated Wire, Moving And Hot Parts .10 7 Accessories .17 8 Enclosures 18 8.1 General 18 8.2 Doors and covers .20 9 Nonmetallic Materials .22 9.1 General 22 9

20、.2 Classication 23 9.3 Application .23 10 Field Supply Connections 25 10.1 General .25 10.2 Permanently connected ice cream makers 25 10.3 Terminals and leads 27 10.4 Cord-connected ice cream makers .28 11 Internal Wiring And Wiring Methods .31 11.1 General .31 11.2 High voltage circuits 32 11.3 Low

21、 voltage circuits .34 11.4 Wiring method .34 11.5 Short circuit protection .34B 12 Secondary Circuits 34B 12.1 General 34B 12.2 Class 2 circuits .37 12.3 Limited voltage/current circuits .37 13 Separation Of Circuits .39 14 Bonding For Grounding 40 ELECTRICAL COMPONENTS 15 Current-Carrying Parts .42

22、A 16 Insulating Material .42A 17 Switches and Controllers .42B DECEMBER 11, 2015 ICE CREAM MAKERS - UL 621 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 18 Motors And Motor Overload Protection .46D 19 Motors .50 19.1 General .50 19.2 Prot

23、ection of single-phase nonhermetic motors 50 19.3 Protection of three-phase motors .52 19.4 Protection of hermetic refrigerant motor-compressors .52 20 Fuseholders 53 20A Fuses, Circuit Breakers, and Supplementary Protectors 54 21 Incandescent Lighting Systems .54A 22 Receptacles 54A 23 Receptacle A

24、nd Lighting Circuit Overcurrent Protection 54A 24 Lampholders 54B 25 Valves And Solenoids 54B 26 Capacitors 54B 26A Outlet Boxes, Electrical Cable, Conduit and Tubing 54D 26B Electromagnetic Interference Filters 54D 26C Relays and Contactors .54D 26D Optical Isolators and Semiconductor Devices 54D 2

25、6E Terminal Blocks .55 26F Printed-Wiring Boards 55 27 Transformer Protection 56 27.1 High-voltage transformers 56 27.2 Overcurrent protective devices .58 28 High-Voltage Control Circuit Conductor Overcurrent Protection .58 28.1 General .58 28.2 Direct-connected, high-voltage control circuits .59 28

26、.3 Tapped high-voltage control circuits 59 28.4 Overcurrent protective devices .60 SPACINGS 29 High-Voltage Circuits 61 30 Low-Voltage Circuits 63 31 Alternate Spacings Clearances and Creepage Distances 63 REFRIGERATION SYSTEM 32 Refrigerant .64 33 Pumpdown Capacity 65 34 Refrigerant Tubing And Fitt

27、ings .65 35 Refrigerant-Containing Parts .66 36 Pressure-Limiting Devices .67 37 Pressure Relief .67 37.1 General .67 37.2 Relief valves .68 37.3 Fusible plugs or rupture members 68 PERFORMANCE 38 Instrumentation .68 38.1 Temperature measurements .68 38.2 Pressure measurements .68A 39 Test Voltage 6

28、8B DECEMBER 11, 2015 ICE CREAM MAKERS - UL 621 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 40 Leakage Current Test Cord-Connected Ice Cream Makers .68B 41 Input Test 73 42 Starting Test .74 43 Temperature And Pressure Test 75 44 Dielect

29、ric Voltage-Withstand Test .78 45 Condenser Fan Motor Failure Test 79 46 Condenser Water Failure Test 80 47 Overow Test 80 48 Stability Test .81 49 Burnout Tests Components 82 50 Burnout Test High-Voltage Transformers .83 51 Overload Test High-Voltage Transformers .83 52 Overvoltage And Undervoltage

30、 Tests 84 53 Current Overload Test Bonding Conductors and Connections 85 54 Insulation Resistance Test .85 55 Limited Short-Circuit Test 85 55.1 General .85 55.2 Motor overload protective devices 87 55.3 Bonding conductors and connections .87 55.4 Motor circuit conductors and connections .87 56 Comp

31、ressor Protective Device Tests 87 57 Strength Tests Pressure Containing Components .89 57.1 Refrigeration system 89 58 Start-To-Discharge Test .91 59 Component Restraint Test .91 60 Fastener Strength Test 91 61 Burnout Test Impedance Protected Motors .92 62 Tests on Nonmetallic Materials .93 63 Stra

32、in Relief Test .94 63A Component Failure Test 94 MANUFACTURING AND PRODUCTION TESTS 64 Pressure Tests 94B 65 Production-Line Dielectric Voltage-Withstand Tests .95 66 Production-Line Grounding Continuity Tests 97 MARKING 67 General 97 68 Permanently Connected Ice Cream Makers .101 69 Cord-Connected

33、Ice Cream Makers 106 INSTRUCTIONS 70 Installation and Operating Instructions 106 DECEMBER 11, 2015 ICE CREAM MAKERS - UL 621 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover unitary ice cream

34、 makers designed for connection to alternating current circuits rated not more than 600 volts. For the purposes of this standard, ice cream makers include equipment for preparing products such as hard ice cream, soft serve ice cream, milk shakes, and sherbets and may include means for dispensing the

35、 product directly into containers. 1.2 Ice cream makers covered by these requirements employ sealed (hermetic type) motor compressors and air-cooled or water-cooled condensers. 1.3 These ice cream makers are intended to be installed in accordance with the National Electrical Code, NFPA 70, and the S

36、afety Standard for Refrigeration Systems, ASHRAE 15. 2 General 2.1 Terminology 2.1.1 The term “ice cream maker” refers to any equipment covered by this standard unless specically noted otherwise. 2.2 Components 2.2 deleted December 11, 2015 2.2.1 deleted December 11, 2015. 2.2.2 deleted December 11,

37、 2015. 2.2.3 deleted December 11, 2015. 2.2.4 deleted December 11, 2015. 2.3 Units of measurement 2.3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. DECEMBER 11, 2015 ICE CREAM MAKERS - UL 621 6UL COPYRIGHTED MATERIAL NOT AU

38、THORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.4 Undated references 2.4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 3 Glossary 3.1 For th

39、e purpose of these requirements, the following denitions apply. 3.2 ACCESSORY An optional electrical device or other component, intended for installation in or connection to an ice cream maker for the purpose of modifying or supplementing the functions of the ice cream maker. It may be factory insta

40、lled or intended for installation by the user or service personnel. 3.2.1 CAPILLARY TUBE Device made of tubing with an outer diameter of less than 3/16 in. (4.7 mm) and used to reduce the pressure of the refrigerant between the condenser and evaporator. It also regulates the refrigerant ow. 3.2.1 ad

41、ded December 11, 2015 3.3 CIRCUITS, ELECTRICAL: a) High-Voltage A circuit involving a potential of not more than 600 volts and having circuit characteristics in excess of those of a low-voltage circuit. b) Low-Voltage (Class 2) A circuit involving a potential of not more than 30 volts alternating cu

42、rrent, 42.4 volts peak or 60 volts direct current, and supplied by: 1) A primary battery, 2) A standard Class 2 National Electrical Code, NFPA 70, transformer, or 3) A combination of a transformer and xed impedance that, as a unit, complies with all performance requirements for a Class 2 transformer

43、. 3.3.1 COMPONENT A device or fabricated part of the appliance covered by the scope of a safety standard dedicated to the purpose. When incorporated in an appliance, equipment otherwise typically eld installed (e.g. luminaire) is considered to be a component. Unless otherwise specied, materials that

44、 compose a device or fabricated part, such as thermoplastic or copper, are not considered components. 3.3.1 added December 4, 2015 3.3.2 CONTROL, TYPE 1 ACTION The actuation of an automatic control for which the manufacturing deviation and the drift (tolerance before and after certain conditions) of

45、 its operating value, operating time, or operating sequence has not been declared and tested under this standard. 3.3.2 added December 4, 2015 3.3.3 CONTROL, TYPE 2 ACTION The actuation of an automatic control for which the manufacturing deviation and the drift (tolerance before and after certain co

46、nditions) of its operating value, operating time, or operating sequence have been declared and tested under this standard. 3.3.3 added December 4, 2015 3.4 ENCLOSURE That part of an appliance that by itself or in conjunction with barriers: DECEMBER 11, 2015 ICE CREAM MAKERS - UL 621 7UL COPYRIGHTED

47、MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL a) Renders inaccessible all or any part of the unit that may otherwise present risk of electric shock, b) Reduces the risk of contact with parts that may cause injury to persons, and/or, c) Prevents propagati

48、on of ame initiated by electrical disturbances occurring within the unit. A unit cabinet that serves as sole enclosure for ignition sources is considered to be a group 1 enclosure. Separate enclosures located within or mounted on the outer surface of the unit cabinet are considered group 1 enclosure

49、s if they serve as a sole enclosure for ignition sources. 3.5 FUNCTIONAL/STRUCTURAL PART A part used to maintain the intended relative physical position of xed or moving parts, or maintain the integrity of the structure. A cabinet liner that supports an electrical component is considered to be a functional part. 3.6 NONFUNCTIONAL PART A part, such as thermal insulation or decorative material, that does not serve as electrical insulation or to support or enclose electrical com