1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 471 Commercial Refrigerators and Freezers STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL
2、 NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Commercial Refrigerators and Freezers, UL 471 Tenth Edition, Dated November 24, 2010 Summary of Topics This revision of ANSI/UL 471 includes the following changes in requirements: Update An
3、d Clarify Section 9, Field Supply Connections. Revision To Section 90, Installation And Operating Instructions. Addition Of Requirements For Alternate Strength And Fatigue Test. Update Temperature Of Fan Motor Winding During Fan Failure Test. This revision also includes miscellaneous editorial corre
4、ctions. 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 September 30, 2016. In the revisions dated December 8
5、, 2016, pages 8C, 8D, 12A, 12B, 22A, and 22B have been intentionally deleted from the Standard due to the deletion or relocation of text. 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
6、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 purpose. In no event will UL be liable for any spe
7、cial, 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 Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. I
8、n 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 defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim,
9、 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. DECEMBER 8, 2016 UL 471 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT
10、PERMISSION FROM UL DECEMBER 8, 2016 UL 471 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 24, 2010 (Title Page Reprinted: December 8, 2016) 1 UL 471 Standard for Commercial Refrigerators and Freezers The Fir
11、st through Third editions were titled Standard for Commercial Refrigerators. First Edition 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
12、 Edition January, 2006 Tenth Edition November 24, 2010 This ANSI/UL Standard for Safety consists of the Tenth Edition including revisions through December 8, 2016. The most recent designation of ANSI/UL 471 as an American National Standard (ANSI) occurred on December 8, 2016. ANSI approval for a sta
13、ndard does not include the Cover Page, Transmittal Pages, and Title Page. 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
14、the Standard 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 https:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in
15、any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 471-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT
16、 PERMISSION FROM UL DECEMBER 8, 2016 COMMERCIAL REFRIGERATORS 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 .7 2 General 7 2.1 Components .7 2.2 Units of measurement
17、 .8 2.3 Terminology .8 2.4 Undated references .8 3 Glossary .8 3A Denitions Relating to Classes of Control Functions 10 CONSTRUCTION 4 General .11 5 Assembly .12 5.1 General 12 5.2 Pressurized product system 13 5.3 Mechanical protection 13 5.4 Electrical protection 17 5.5 Refrigerators and freezers
18、intended for installation within a motor fuel dispensing facility 22 6 Accessories .23 7 Enclosures 24 7.1 General 24 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 Con
19、nections .34 9.1 General 34 9.2 Permanently connected refrigerators .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 .44
20、B 11 Secondary Circuits 45 11.1 General .45 11.2 Class 2 circuits .47 11.3 Limited voltage/current circuits .47 12 Separation Of Circuits .49 13 Bonding For Grounding 50 DECEMBER 8, 2016 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION O
21、R DISTRIBUTION WITHOUT PERMISSION FROM UL ELECTRICAL COMPONENTS 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 moto
22、rs 60 18.3 Protection of three-phase motors .62 18.4 Protection 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 Protec
23、tors 66 21 Electric-Discharge Lighting Systems 67 22 Lighted 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,
24、 Electrical Cable, Conduit and Tubing 68E 27C Electromagnetic Interference Filters 68E 27D Relays and Contactors .68E 27E Wireways, Auxiliary Gutters and Associated Fittings 68E 27F Batteries and Battery Chargers 68F 27G Optical Isolators and Semiconductor Devices 68F 27H Terminal Blocks .68G 27I Pr
25、inted-Wiring Boards .68G 28 Transformer Protection .68H 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 Gen
26、eral .72 29.2 Direct-connected high-voltage control circuit .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 REFRIGERATION SYSTEM DECEMBER 8, 2016 COMMERCIAL REFRIGERATORS AND F
27、REEZERS - UL 471 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 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
28、 Device 79 38 Pressure Relief .81 38.1 General .81 38.2 Relief valves .82 38.3 Fusible plugs or rupture members 82 38A Thermoelectric System .82 PERFORMANCE 39 Instrumentation 82A 39.1 Temperature measurements 82A 39.2 Pressure measurements .82B 40 Test Voltage .83 41 Leakage Current Test Cord Conne
29、cted Refrigerators 83 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
30、 Test 96 51 Evaporator 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 Te
31、st Electric Heater .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
32、 and acoustical insulating 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 DECEMBER 8, 2016 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 4AUL CO
33、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 67 Protective Devices Maximum Continuous Current Test .110 68 Strength Tests Pressure Containing Components 112 68.1 Refrigeration system .112 68.2 Beverage product system 113 69 Fatigue Test Analys
34、is 114 69.1 General 114 69.2 Initial test 114 69.3 Material specications .115 69.4 Cycling test specications 115 69.5 Test method 115 69.6 Test parameters 116 69.7 Cycle test pressure specication 116 70 Start-To-Discharge Test .116A 71 Regulating Relief Valve Endurance Test 117 72 Shelf Strength Tes
35、t 117 73 Component Restraint 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 1
36、22 79 Metallic Coating Thickness 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 83D Tests on Thermoelectric R
37、efrigerators and Freezers 126C 83D.1 General .126C 83D.2 Thermoelectric cooling appliances without fans 126C 83D.3 Thermoelectric cooling appliances with fans .126D 83D.4 Thermoelectric circuits powered by other than a low voltage class 2 or limited power source supply 126D 83D.5 Dielectric voltage
38、withstand 5000 volt test .126D MANUFACTURING AND PRODUCTION TESTS 84 Pressure Tests .126E 85 Production Line Dielectric Voltage Withstand Tests .126E 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 P
39、ermanently Connected Refrigerators 134B DECEMBER 8, 2016 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 4BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 89 Cord Connected Refrigerators .142 INSTRUCTIONS 90 Installation And Operating Instruc
40、tions .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 SA5 Wiring SA2 SA6 Insulating Material .SA2 SA7 Electrical Connections SA2 PERFORMANCE SA8 Vibration
41、 Test .SA3 SA9 Shock Test .SA3 SA10 Pitch And Roll Tests SA4 SA10.1 General .SA4 SA10.2 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 REFRIGE
42、RANT IN THE REFRIGERATING SYSTEM SB1 Scope SB1 SB2 Denitions SB1 SB3 General SB2 SB4 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 DECEMBER 8, 2016 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 5UL CO
43、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SB5.2 Ignition protection test SB6A SB5.3 Temperature test SB7 SB5.4 Scratch test SB8 SB6 Marking, Installation and Operating Instructions SB10 SB6.1 Marking .SB10 SB6.2 Installation and operating i
44、nstructions .SB11 SUPPLEMENT SC - UL 60335-1 BASED REQUIREMENTS FOR THE EVALUATION OF ELECTRONIC CIRCUITS INTRODUCTION SC1 Scope SC1 SC2 General SC1 SC3 Glossary .SC1 CONSTRUCTION SC4 Components SC2 SC4.1 Capacitors .SC2 SC4.2 Isolation devices SC3 SC4.3 Switch mode power supplies .SC3 SC4.4 Tempera
45、ture sensing, thermistor devices SC4 SC5 Identication of Safety Critical Circuit Functions .SC4 SC5.1 General SC4 SC5.2 Protective electronic circuits SC4 SC5.3 Operating circuits that mitigate a dangerous malfunction of the appliance SC5 SC6 Evaluation of the different types of electronic circuits
46、SC5 SC6.1 All types of circuits SC5 SC7 Circuits that provide safety critical functions SC5 PERFORMANCE SC8 General conditions for the tests .SC6 SC8.1 Details .SC6 SC8.2 Intentionally weak parts SC6 SC8.3 Test results determined by overcurrent protection operation SC7 SC9 Low power circuits .SC7 SC
47、9.1 Low-power circuit determination SC7 SC10 Abnormal operation and fault tests .SC9 SC10.1 General .SC9 SC10.2 Low power circuit re tests .SC10 SC11 Programmable component reduced supply voltage test SC10 SC12 Electromagnetic compatibility (EMC) requirements immunity SC11 APPENDIX A DECEMBER 8, 201
48、6 COMMERCIAL REFRIGERATORS AND FREEZERS - UL 471 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover commercial refrigerators and freezers intended for connection to alternating-current circuits
49、 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 Dispensing Facilities and Repair Garages, NFPA 30A. 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 cabin
