1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 471 Commercial Refrigerators and FreezersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR
2、FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Commercial Refrigerators and Freezers, UL 471 Tenth Edition, Dated November 17, 2014 Summary of Topics This revision of ANSI/UL 471 includes the following: 1. Revisions to incorporate operating control require
3、ments, protective control parameters, and safety critical functions 2. Revisions for motors and motor overload protection 3. Miscellaneous revisions including updated standard references, thermal equilibrium requirements, and removal of R-22 references 4. Revisions to supplement SB Refrigerators and
4、 freezers employing a ammable refrigerant in the refrigerating system 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 vertical line in the margin and are followed by an ef
5、fective 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 September 5, 2014. All rights reserved. No part of this publication may be repr
6、oduced, 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 or implied, including but not limited to, the imp
7、lied 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 the use of or the inability to use this Standar
8、d, 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 electronic versions of ULs Standards for Safety agree to
9、 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 on the purchasers computer system. The requireme
10、nts 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 have been revised and that have a future effect
11、ive date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. NOVEMBER 17, 2014 UL 471 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 17, 2014 UL 471 tr2 No Text on This PageUL COPYRIGHTED MATERI
12、AL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 24, 2010 (Title Page Reprinted: November 17, 2014) 1 UL 471 Standard for Commercial Refrigerators and Freezers The First through Third editions were titled Standard for Commercial Refrigerators. First Edit
13、ion October, 1957 Second Edition June, 1962 Third Edition May, 1973 Fourth Edition September, 1975 Fifth Edition May, 1978 Sixth Edition January, 1985 Seventh Edition July, 1992 Eighth Edition November, 1995 Ninth Edition January, 2006 Tenth Edition November 24, 2010 This ANSI/UL Standard for Safety
14、 consists of the Tenth Edition including revisions through November 17, 2014. The most recent designation of ANSI/UL 471 as an American National Standard (ANSI) occurred on November 17, 2014. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective da
15、te information. The Department of Defense (DoD) has adopted UL 471 on March 23, 1976. 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
16、 should be submitted via a Proposal Request in ULs On-Line Collaborative 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, ownership
17、s, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2014 UNDERWRITERS LABORATORIES INC. ANSI/UL 471-2014UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 17, 2014 COMMERCIAL REFRIGERAT
18、ORS AND FREEZERS - UL 471 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .8 2 General 8 2.1 Components .8 2.2 Units of measurement .8A 2.3 Terminology 8A 2.4 Undated references .8A 3 Gloss
19、ary 8A 3A Denitions Relating to Classes of Control Functions .9 CONSTRUCTION 4 General .10 5 Assembly .13 5.1 General 13 5.2 Pressurized product system 13 5.3 Mechanical protection 14 5.4 Electrical protection 18 5.5 Refrigerators and freezers intended for installation within a motor fuel dispensing
20、 facility 22A 6 Accessories 22B 7 Enclosures 23 7.1 General 23 7.2 Doors and covers .27 7.3 Enclosures exposed to weather .29 8 Nonmetallic Materials .31 8.1 General 31 8.2 Classication 32 8.3 Application .32 ELECTRICAL SYSTEM 9 Field Supply Connections .34 9.1 General 34 9.2 Permanently connected r
21、efrigerators .35 9.3 Cord-connected refrigerators 38 9.4 Grounding 40 10 Internal Wiring And Wiring Methods .41 10.1 General .41 10.2 High voltage circuits 42 10.3 Low voltage circuits .44 10.4 Wiring method .44 10.5 Short circuit protection .44B 11 Secondary Circuits 45 11.1 General .45 11.2 Class
22、2 circuits .47 11.3 Limited voltage/current circuits .47 12 Separation Of Circuits .49 13 Bonding For Grounding 50 NOVEMBER 17, 2014 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL ELECTRICAL C
23、OMPONENTS 14 Current-Carrying Parts 52 15 Insulating Material .52A 16 Switches And Controllers .52A 16.1 General 52A 16.2 Motor controllers .55 17 Motors .58 18 Motor Protection 60 18.1 General .60 18.2 Protection of single-phase nonhermetic motors 60 18.3 Protection of three-phase motors .62 18.4 P
24、rotection of hermetic refrigerant motor-compressors .62 19 Electric Heaters 63 19.1 Heater elements .63 19.2 Heater control 64 20 Fuseholders And Circuit Breakers 65 20.1 Fuseholders .65 20.2 Circuit breakers 66 20A Fuses and Supplementary Protectors 66 21 Electric-Discharge Lighting Systems 67 22 L
25、ighted and Associated Components 68 23 Incandescent Lighting Systems .68A 24 Guarding Of Lamps 68A 25 Receptacles 68B 26 Receptacle And Lighting Circuits Overcurrent Protection .68B 27 Capacitors 68C 27A Valves and Solenoids 68D 27B Outlet Boxes, Electrical Cable, Conduit and Tubing 68E 27C Electrom
26、agnetic Interference Filters 68E 27D Relays and Contactors .68E 27E Wireways, Auxiliary Gutters and Associated Fittings 68F 27F Batteries and Battery Chargers 68F 27G Optical Isolators and Semiconductor Devices .68G 27H Terminal Blocks .68G 27I Printed-Wiring Boards .68G 28 Transformer Protection .6
27、8H 28.1 General 68H 28.2 High-voltage transformers thermal protection .69 28.3 High-voltage transformers overcurrent protection .71 28.4 Overcurrent protective device 72 29 High-Voltage Control Circuit Conductor Overcurrent Protection .72 29.1 General .72 29.2 Direct-connected high-voltage control c
28、ircuit .73 29.3 Tapped high-voltage control circuit .73 SPACINGS 30 High-Voltage Circuits 75 31 Low-Voltage Circuits 77 32 Alternate Spacings Clearances and Creepage Distances 77 NOVEMBER 17, 2014 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPR
29、ODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL REFRIGERATION SYSTEM 33 Refrigerants 78 33.1 General .78 33.2 Testing 78A 34 Pump-Down Capacity 78B 35 Refrigerant Tubing And Fittings .78B 36 Refrigerant-Containing Parts 78D 37 Pressure-Limiting Device 79 38 Pressure Relief .81 38.1 General .81 3
30、8.2 Relief valves .82 38.3 Fusible plugs or rupture members 82 JUNE 28, 2013 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 4AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SEPTEMBER 23, 2011 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 4
31、B No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 39 Instrumentation .82 39.1 Temperature measurements .82 39.2 Pressure measurements 83 40 Test Voltage .84 41 Leakage Current Test Cord Connected Refrigerators
32、 84 42 Input Test 85 43 Starting Test .86 44 Temperature and Pressure Test 87 45 Heating Test Condensation Wiring 91 46 Heating Test Ballasts And Wiring .91 47 Defrost Test 92 48 Dielectric-Voltage Withstand Test .94 49 Condenser Fan Motor Failure Test 95 50 Condenser Water Failure Test 96 51 Evapor
33、ator Fan Motor Failure Test 96 52 Overow Test 97 53 Rain Test 97 54 Stability Test 101 55 Static Load Test .102 56 Strain Relief Test 102 57 Heater Control Tests .103 57.1 Endurance test .103 57.2 Calibration test 103 58 Condensate Water Evaporator Test 104 59 Abnormal Operation Test Electric Heater
34、 .104 60 Burnout Tests Electromagnetic Components 105 61 Burnout Test High-Voltage Transformers .105 62 Overload Test High-Voltage Transformers 106 63 Overvoltage And Undervoltage Tests 107 64 Current Overload Test 107 65 Insulation Resistance Test 108 65.1 Heaters 108 65.2 Thermal and acoustical in
35、sulating material .108 66 Limited Short-Circuit Test .108 66.1 General 108 66.2 Motor overload protective device 110 66.3 Bonding conductors and connections 110 66.4 Motor circuit conductors and connections 110 67 Protective Devices Maximum Continuous Current Test .110 68 Strength Tests Pressure Con
36、taining Components 112 68.1 Refrigeration system .112 68.2 Beverage product system 113 69 Fatigue Test Analysis 114 69.1 General 114 69.2 Initial test 114 69.3 Material specications .114 69.4 Cycling test specications 114 69.5 Test method 115 69.6 Test parameters 115 69.7 Cycle test pressure specica
37、tion 116 70 Start-To-Discharge Test 116 JUNE 28, 2013 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 71 Regulating Relief Valve Endurance Test 117 72 Shelf Strength Test 117 73 Component Restr
38、aint Test 119 74 Glass Strength Test 120 75 Door Latch Release and Door Opening Test .120A 75.1 Door Latch Release Test .120A 75.2 Door Opening Test .120A 76 Accelerated Aging Test Electric Heaters .120B 77 Reliability Test Heater Terminations 122 78 Accelerated Aging Tests 122 79 Metallic Coating T
39、hickness Test .123 80 Fastener Strength Test .124 81 Burnout Test Impedance Protected Motors 125 82 Tests on Nonmetallic Materials 126 83 Label Adhesion Tests .126A 83A Static Pressure Test .126A 83B Reserved 126A 83C Component Failure Test .126A MANUFACTURING AND PRODUCTION TESTS 84 Pressure Tests
40、.126C 85 Production Line Dielectric Voltage Withstand Tests .126C 86 Grounding Continuity Tests .130 MARKING 87 General 130 87.1 Details .130 87.2 Refrigerant .131 87.3 Other markings .133 87.4 Accessories .134A 88 Permanently Connected Refrigerators 134B 89 Cord Connected Refrigerators .142 INSTRUC
41、TIONS 90 Installation And Operating Instructions .143 SUPPLEMENT SA - COMMERCIAL REFRIGERATORS AND FREEZERS FOR MARINE USE INTRODUCTION SA1 Scope SA1 CONSTRUCTION SA2 General SA1 SA3 Protection Against Corrosion SA1 SA4 Supply Connections SA2 NOVEMBER 17, 2014 COMMERCIAL REFRIGERATORS AND FREEZERS -
42、 UL 471 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SA5 Wiring SA2 SA6 Insulating Material .SA2 SA7 Electrical Connections SA2 PERFORMANCE SA8 Vibration Test .SA3 SA9 Shock Test .SA3 SA10 Pitch And Roll Tests SA4 SA10.1 General .SA4 SA1
43、0.2 Pitch .SA4 SA10.3 Roll SA4 SA11 Salt-Spray Corrosion Test .SA4 SA12 Ignition Protection Test SA5 MARKING SA13 General .SA5 SUPPLEMENT SB - REQUIREMENTS FOR REFRIGERATORS AND FREEZERS EMPLOYING A FLAMMABLE REFRIGERANT IN THE REFRIGERATING SYSTEM SB1 Scope SB1 SB2 Denitions SB1 SB3 General SB2 SB4
44、 Construction SB3 SB4.1 General SB3 SB4.2 Refrigeration system .SB4 SB4.3 Resistance to corrosion SB5 SB5 Performance SB5 SB5.1 Leakage test .SB5 SB5.2 Ignition protection test SB6B SB5.3 Temperature test SB7 SB5.4 Scratch test SB8 SB6 Marking, Installation and Operating Instructions SB10 SB6.1 Mark
45、ing .SB10 SB6.2 Installation and operating instructions .SB11 APPENDIX A NOVEMBER 17, 2014 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover comm
46、ercial refrigerators and freezers intended for connection to alternating-current circuits rated not greater than 600 volts. 1.1.1 These requirements also cover commercial refrigerators and freezers intended for installation within motor fuel dispensing facilities as dened by the Code for Motor Fuel
47、Dispensing Facilities and Repair Garages, NFPA 30A. 1.1.1 added November 30, 2012 1.2 These requirements apply to unitary and remote commercial refrigerators and freezers. For the purposes of this standard, commercial refrigerators and freezers include equipment, such as display cases, reach-in cabi
48、nets, meat cases, frozen food and merchandising cabinets, beverage coolers, beverage cooler-dispensers, food service carts, ice cream cabinets, soda fountain units, door panel assemblies, laboratory refrigerators and freezers, and processing liquid coolers. 1.2 revised November 30, 2012 1.3 Self-con
49、tained commercial refrigerators and freezers covered by these requirements employ hermetic or semi-hermetic refrigerant motor-compressors and air- and water-cooled condensers or are of the thermoelectric type. 1.4 These requirements do not apply to refrigeration systems such as those used in cold-storage rooms, walk-in coolers, and similar places, that are fabricated in the eld. 1.5 Requirements for the installation of commercial refrigerators and freezers are included in
