1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 621 Ice Cream Makers STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR F
2、URTHER REPRODUCTION 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 revision to ANSI/UL 621 includes Supplement SA for the Addition of UL 60335-1 based requirements for the Evaluation of
3、 Electronic Circuits and miscellaneous editorial corrections. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated
4、 December 9, 2016. All rights reserved. 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
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7、he claim. Users of the electronic 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
8、storing an electronic Standard 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 on this transmittal notice. The prior text for
9、 requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. FEBRUARY 15, 2017 UL 621 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBR
10、UARY 15, 2017 UL 621 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: February 15, 2017) 1 UL 621 Standard for Ice Cream Makers The First and Second editions were titled Ice Cream Fre
11、ezers and Soda Fountain 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 revision
12、s through February 15, 2017. The most recent designation of ANSI/UL 621 as an American National Standard (ANSI) occurred on February 15, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, and Title Page. The Department of Defense (DoD) has adopted UL 621 on Februa
13、ry 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 Collaborative
14、Standards Development System (CSDS) at https:/. 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 and exclus
15、ive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 621-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 15, 2017 ICE CREAM MAKERS - UL 621 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FU
16、RTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .7 2 General 7 2.1 Terminology .7 2.2 Components .7 2.3 Units of measurement .7 2.4 Undated references .8 3 Glossary .8 3A Denitions Relating To Classes Of Control Functions .8B CONSTRUCTION 4 General 8B 5 As
17、sembly .8C 5.1 General 8C 5.2 Pressurized product system 8D 5.3 Mechanical protection .8D 6 Accessibility Of Uninsulated Live Parts, Film-Coated Wire, Moving And Hot Parts 9 7 Accessories .17 8 Enclosures 18 8.1 General 18 8.2 Doors and covers .20 9 Nonmetallic Materials .22 9.1 General 22 9.2 Class
18、ication 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 voltage
19、 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 .42A 16 Ins
20、ulating Material .42A 17 Switches and Controllers .42B FEBRUARY 15, 2017 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 Protection o
21、f 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 And Light
22、ing 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 26E Termi
23、nal Blocks .55 26F Printed-Wiring Boards 55 27 Transformer Protection 55 27.1 High-voltage transformers 55 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 28.3 Tappe
24、d 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 Fittings .65
25、 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 68B FEBRU
26、ARY 15, 2017 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 Dielectric Volt
27、age-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 Tests 8
28、4 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 Compressor P
29、rotective 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 Strain Relie
30、f 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 Ice Crea
31、m Makers 106 INSTRUCTIONS 70 Installation and Operating Instructions 106 FEBRUARY 15, 2017 ICE CREAM MAKERS - UL 621 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SUPPLEMENT SA - UL 60335-1 BASED REQUIREMENTS FOR THE EVALUATION OF ELECTRO
32、NIC CIRCUITS INTRODUCTION SA1 Scope .SA1A SA2 General .SA1A SA3 Glossary SA1A CONSTRUCTION SA4 Components .SA2A SA4.1 Capacitors SA2A SA4.2 Isolation devices .SA3A SA4.3 Switch mode power supplies SA3A SA4.4 Temperature sensing, thermistor devices .SA4A SA5 Identication of Safety Critical Circuit Fu
33、nctions .SA4A SA5.1 General .SA4A SA5.2 Protective electronic circuits .SA4A SA5.3 Operating circuits that mitigate a dangerous malfunction of the appliance .SA4A SA6 Evaluation of the Different Types of Electronic Circuits SA5A SA6.1 All types of circuits SA5A SA7 Circuits That Provide Safety Criti
34、cal Functions .SA5A PERFORMANCE SA8 General Conditions for the Tests .SA6A SA8.1 Details SA6A SA8.2 Intentionally weak parts .SA6A SA8.3 Test results determined by overcurrent protection operation .SA7A SA9 Low-Power Circuits SA7A SA9.1 Low-power circuit determination .SA7A SA10 Abnormal Operation a
35、nd Fault Tests SA8A SA11 Programmable Component Reduced Supply Voltage Test SA10A SA12 Electromagnetic Compatibility (EMC) Requirements Immunity .SA11A FEBRUARY 15, 2017 ICE CREAM MAKERS - UL 621 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM
36、 UL INTRODUCTION 1 Scope 1.1 These requirements cover unitary ice cream 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 cr
37、eam, milk shakes, and sherbets and may include means for dispensing the 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 instal
38、led in accordance with the National Electrical Code, NFPA 70, and the Safety 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 2.2.1 Deleted. 2.2
39、.2 Deleted. 2.2.3 Deleted. 2.2.4 Deleted. 2.3 Units of measurement 2.3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. FEBRUARY 15, 2017 ICE CREAM MAKERS - UL 621 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTI
40、ON 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 the purpose of these requirements
41、, 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 installed or intended for installati
42、on 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. 3.3 CIRCUITS, ELECTRICAL: a) High-Volta
43、ge 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 current, 42.4 volts peak or 60 volts direct current, and suppli
44、ed 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. 3.3.1 COMPONENT A device or fabricated part of the applianc
45、e 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 compose a device or fabricated part, such as thermoplastic o
46、r copper, are not considered components. 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 its operating value, operating time, or operating sequence has not been declared and test
47、ed under this standard. 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 conditions) of its operating value, operating time, or operating sequence have been declared and tested under this standa
48、rd. 3.4 ENCLOSURE That part of an appliance that by itself or in conjunction with barriers: 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, FEBRUARY 15, 2017 ICE
49、 CREAM MAKERS - UL 621 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL c) Prevents propagation 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 enclosures if they serve as a sole enclos
