UL 474-2015 UL Standard for Safety Dehumidifiers (Tenth Edition Reprint with Revisions Through and Including June 24 2015).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 474 DehumidiersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DI

2、STRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Dehumidiers, UL 474 Tenth Edition, Dated June 22, 2015 Summary of Topics The revisions dated June 24, 2015, were issued to editorially remove a statement from this transmittal page. No changes have been made to the body of the standard

3、. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated June 13, 2014, November 28, 2014, and December 19, 2014. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means

4、, 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 purpose. In no event will

5、 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 Standard, even if UL or an authorized UL representative has been advised of the poss

6、ibility 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 defend, indemnify, and hold UL harmless from and against any loss, expense,

7、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. JUNE 24, 2015 UL 474 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR

8、 DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 24, 2015 UL 474 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 22, 2015 (Title Page Reprinted: June 24, 2015) 1 UL 474 Standard for Dehumidiers First Edition August,

9、 1957 Second Edition November, 1969 Third Edition June, 1973 Fourth Edition September, 1978 Fifth Edition July, 1981 Sixth Edition August, 1987 Seventh Edition June, 1993 Eighth Edition July, 2004 Ninth Edition July, 2009 Tenth Edition June 22, 2015 This ANSI/UL Standard for Safety consists of the T

10、enth Edition. The most recent designation of ANSI/UL 474 as an American National Standard (ANSI) occurred on June 19, 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 474 o

11、n January 18, 1994. 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 Collabo

12、rative 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 and

13、exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 474-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 22, 2015 DEHUMIDIFIERS - UL 474 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FUR

14、THER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .7 2 General 7 2.1 Units of measurement .7 2.2 Undated references .7 3 Glossary .7 CONSTRUCTION 4 General 8 5 Assembly 9 6 Enclosures 12 7 Polymeric Materials Application 13 8 Supply Connections 14 9 Internal

15、Wiring .16 10 Bonding for Grounding 20 ELECTRICAL COMPONENTS 11 Capacitors .21 12 Current-Carrying Parts 22 13 Electric Heaters 23 13.1 Heater elements .23 13.2 Heater over-temperature control 24 14 Insulating Material 24 15 Motors and Motor Overload Protection 25 16 Motor Protection 27 16.1 General

16、 .27 16.2 Protection of single-phase nonhermetic motors 27 16.3 Protection of hermetic refrigerant motor-compressors .29 17 Switches and Controllers 29 18 Valves and Solenoids .31 19 Outlet Boxes, Electrical Cable, Conduit and Tubing .32 20 Electromagnetic Interference Filters .32 21 Relays and Cont

17、actors 32 22 Optical Isolators and Semiconductor Devices 33 23 Terminal Blocks 33 24 Electrical Spacings 33 24.1 High-voltage circuits 33 24.2 Low-voltage circuits .35 25 Alternate Spacings Clearances and Creepage Distances 36 REFRIGERATION SYSTEM 26 Refrigerants 37 27 Refrigerant Tubing and Fitting

18、s .37 28 Refrigerant-Containing Parts .38 29 Pressure Relief .38 JUNE 22, 2015 DEHUMIDIFIERS - UL 474 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 30 Instrumentation .38 30.1 Temperature measurements .38 30.2 Pressure measure

19、ments 39 31 Test Voltage .40 32 Leakage Current Test .40 33 Input Test 44 33.1 Dehumidifying load .44 33.2 Heating load .44 34 Temperature and Pressure Test 44 35 Temperature Test Electric Heat .46 36 Dielectric Voltage Withstand Test .47 37 Fan Motor Failure Test 48 38 Heater Burnout Test 48 39 Ove

20、row Test 49 40 Static Load Test 49 41 Heater Temperature-Limiting Control Tests 50 41.1 Endurance test .50 41.2 Calibration test .51 42 Current Overload Test Bonding Conductors and Connections 51 43 Insulation Resistance Test .51 43.1 Electric heaters 51 43.2 Thermal and acoustical insulating materi

21、al 52 44 Limited Short-Circuit Test 52 44.1 General .52 44.2 Motor overload protective device .53 44.3 Bonding conductors and connections .53 44.4 Motor circuit conductors and connections .53 45 Accelerated Aging Test Electric Heaters .53 46 Reliability Test Heater Terminations .55 47 Strength Tests

22、 Pressure Containing Components .55 48 Fatigue Test Analysis .56 48.1 General .56 48.2 Initial test specications .56 48.3 Material specications 56 48.4 General cycling test specications 56 48.5 Test method .57 48.6 Test parameters .57 48.7 Cycle test pressure specication .58 49 Push-Back Relief Test

23、 .58 50 Burnout Tests Electromagnetic Components .59 51 Refrigerant Loss Test .59 MANUFACTURING AND PRODUCTION TESTS 52 Pressure Tests .61 53 Production Line Dielectric Voltage Withstand Tests .61 54 Production Line Grounding Continuity Tests 63 MARKING 55 General 63 JUNE 22, 2015 DEHUMIDIFIERS - UL

24、 474 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INSTRUCTIONS 56 Operating Instructions .66 SUPPLEMENT SA - REQUIREMENTS FOR LOW FREQUENCY RADIO PULSE NON-MOVABLE DEHUMIDIFIERS WITHOUT A HERMETIC REFRIGERANT MOTOR-COMPRESSOR SA1 Scope S

25、A1 SA2 Denitions SA1 SA3 Enclosures SA1 SA4 Supply Connections SA1 SA5 Bonding for Grounding .SA2 SA6 Secondary Circuits .SA2 SA6.1 General SA2 SA6.2 Class 2 circuits .SA3 SA6.3 Class 2 circuits .SA3 SA7 Marking SA5 SUPPLEMENT SB - ALTERNATIVE PATH FOR ELECTRONIC CONTROLS REQUIREMENTS INTRODUCTION .

26、SB1 SB1 Scope SB1 SB2 General SB2 SB3 Denitions SB2 CONSTRUCTION SB3 SB4 Components SB3 SB4.1 Temperature sensing, thermistor devices .SB3 SB4.2 Printed wiring boards SB4 SB5 Enclosures SB4 SB6 Field Connections .SB4 SB7 Electrical Spacing SB5 SB8 Electrical Insulation SB5 SB9 Control Functions SB5

27、SB9.1 General SB5 SB9.2 Protective electronic circuits/control SB5 SB9.3 Operating controls or circuits that perform safety critical functions .SB6 SB10 Evaluation of the Different Types of Control Circuits SB6 SB11 Protective Electronic Circuits .SB7 SB12 Operating Controls or Circuits that Perform

28、 Safety Critical Functions SB7 PERFORMANCE .SB8 SB13 General Conditions for the Tests .SB8 SB13.1 Details SB8 SB13.2 Intentionally weak parts .SB8 SB13.3 Test results determined by overcurrent protection operation .SB9 SB14 Low-Power Circuits .SB9 SB14.1 Low-power circuit determination SB9 SB14.2 Lo

29、w-power circuit re tests .SB10 SB15 Abnormal Operation and Fault Tests .SB11 SB16 Programmable Component Reduced Supply Voltage Test SB12 JUNE 22, 2015 DEHUMIDIFIERS - UL 474 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL SB17 Electromagne

30、tic Compatibility (EMC) Requirements - Immunity .SB12 MANUFACTURING AND PRODUCTION LINE TESTING SB14 SB18 General SB14 MARKINGS .SB14 SB19 General SB14 JUNE 22, 2015 DEHUMIDIFIERS - UL 474 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INT

31、RODUCTION 1 Scope 1.1 These requirements cover movable, household, self-contained dehumidiers employing hermetic refrigerant motor-compressors and intended for connection to single-phase, alternating-current (ac) circuits rated not more than 20 amperes, 125 volts or 15 amperes, 208 or 230 volts. The

32、 requirements also cover dehumidiers which incorporate electric air heaters. 2 General 2.1 Units of measurement 2.1.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 2.2 Undated references 2.2.1 Any undated reference to a code

33、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 this standard, the following denitions apply. 3.2 ARC-FAULT CIRCUIT-INTERRUPTER (AFCI) A device intended to mitigate the effe

34、cts of arcing faults by functioning to deenergize the circuit where an arc-fault is detected. 3.3 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

35、(e.g. luminaire) is considered to be a component. Unless otherwise specied, materials that compose a device or fabricated part, such as thermoplastic or copper, are not considered components. 3.4 CAPILLARY TUBE Device made of tubing with an outer diameter of less than 3/16 in. (4.7 mm) and used to r

36、educe the pressure of the refrigerant between the condenser and evaporator. It also regulates the refrigerant ow. 3.5 OPERATING CONTROL A control intended to start, regulate, or operate the appliance during normal operation. An example would be a thermostat or temperature controller. 3.6 PROTECTIVE

37、(SAFETY) CONTROL A control intended to prevent the risk of electric shock, re, or injury to persons, typically during abnormal operation of the appliance. An example would be a pressure limiting control. JUNE 22, 2015 DEHUMIDIFIERS - UL 474 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODU

38、CTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 4 General 4.1 Ferrous metal parts used to support or retain electrical components in position shall be protected against corrosion by metallic or nonmetallic coatings, such as plating or painting. Exception: This requirement does not appl

39、y to parts, such as washers, screws, bolts, and the like, where corrosion of such unprotected parts would not affect compliance with the requirements of this standard. 4.2 A component shall: a) Comply with the safety standard covering that component; b) Be used in accordance with its rating(s) estab

40、lished for the intended conditions of use; c) Be used within its established use limitations or conditions of acceptability; d) Comply with the applicable requirements of this end product standard; and Exception: A component of a product covered by this standard is not required to comply with a spec

41、ic component requirement that: a) Involves a feature or characteristic not required in the application of the component in the product, or b) Is superseded by a requirement in this standard, or c) Is separately investigated when forming part of another component, provided the component is used withi

42、n its established ratings and limitations. 4.3 A component that is also required to perform other necessary functions, such as overcurrent protection, ground-fault circuit interruption, surge suppression, any other similar functions, or any combination thereof, shall comply additionally with the req

43、uirements of the applicable standard(s) covering products that provide those functions. Exception: Where these other functions are not required for the application and not identied as part of markings, instructions, or packaging for the appliance, the additional component standard(s) need not be app

44、lied. 4.4 Components shall not contain liquid mercury. JUNE 22, 2015 DEHUMIDIFIERS - UL 474 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5 Assembly 5.1 Opening in the enclosure of a dehumidier shall be designed and located to reduce the

45、risk of unintentional contact with: a) Uninsulated live parts, b) Parts which may cause injury to persons, such as fan blades and blower wheels, and c) Electric heater elements. The minor dimension of such openings shall not permit passage of a 1 inch (25.4 mm) diameter hemispherically-tipped rod, a

46、pplied with a force of 2.5 pounds (11.1 N). In evaluating openings, parts of the enclosure, such as covers, panels, and grilles are to be removed unless tools are required for their removal or when exposed, a moving part is made inoperative or an uninsulated electrical part is de-energized through t

47、he use of interlocking devices. 5.2 An opening is acceptable if the probe illustrated in Figure 5.1 cannot contact uninsulated live parts, lm coated wire, moving parts, and heater elements. The probe is to be applied: a) With a force of 2.5 pounds (11.1 N) and b) In any possible conguration and to a

48、ny depth that the size of an opening will permit. The probe is to be rotated or angled to any possible position before, during, or after insertion through the opening; and, if necessary, the conguration of the probe may be changed after the probe has been inserted through the opening. Exception: For

49、 lm-coated wire, an opening in the motor enclosure of 3/4 inch (19.0 mm) or less is acceptable if the probe illustrated in Figure 5.2 cannot contact the wire. This is generated text for gtxt. JUNE 22, 2015 DEHUMIDIFIERS - UL 474 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This is generated text for gtxt. Figure 5.1 Accessibility probe JUNE 22, 2015 DEHUMIDIFIERS - UL 474 10UL COPYRIGHTED MATERIAL NOT A