C22.2 No. 104-11

Humidifiers

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Update No. 1

C22.2 No. 104-11

April 2016

Note: For information about the Standards Update Service, go to shop.csa.ca or e-mail

techsupport@csagroup.org.

Title: Humidifiers — originally published April 2011

The following revisions have been formally approved and are marked by a vertical line in the margin on the attached replacement pages:

• Update your copy by inserting these revised pages.

• Keep the pages you remove for reference.

  
  

  CSA Group

  CSA C22.2 No. 104-11

  Fourth Edition

  
  

  Underwriters Laboratories Inc. UL 998

  Fifth Edition

  
  

  Humidifiers

  
  

  April 25, 2011

  
  

  (Title Page Reprinted: April 4, 2016)

  
  

  ANSI/UL 998-2016

  Commitment for Amendments

  
  

  This standard is issued jointly by the Canadian Standards Association (operating as “CSA Group”), and Underwriters Laboratories Inc. (UL). Comments or proposals for revisions on any part of the standard may be submitted to CSA Group or UL at anytime. Revisions to this standard will be made only after processing according to the standards development procedures of CSA Group and UL. CSA Group and UL will issue revisions to this standard by means of a new edition or revised or additional pages bearing their date of issue.

  
  

  
  

  ISBN 978-1-55491-623-8 © 2016 CSA Group

  
  

  All rights reserved. No part of this publication may be reproduced in any form whatsoever without the prior permission of the publisher.

  
  

  This Standard is subject to review five years from the date of publication, and suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the following information to inquires@csagroup.org and include Proposal for change in the subject line: Standard designation (number); relevant clause, table, and/or figure number; wording of the proposed change; and rationale for the change.

  
  

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  Copyright © 2016 Underwriters Laboratories Inc.

  
  

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  CONTENTS

  PREFACE 6

  INTRODUCTION

  1. Scope 7

  2. Definitions 7

  3. General 9

     1. Components 9

     2. Reference publications 10

        3.3 Units of measurement ....................................................... .10B

        3.4 Terminology 11

        CONSTRUCTION

  4. General 11

  5. Enclosures 11

     1. General 11

     2. Nonmetallic materials 13

     3. Enclosure integrity 14

  6. Doors and Covers 15

  7. Accessibility of Uninsulated Hazardous Voltage Live Parts and Film-Coated Wire 16

  8. Protection Against Risk of Injury to Persons – Mechanical Protection 17

  9. Protection Against Risk of Injury to Persons – Materials 18

  10. Protection Against Risk of Injury to Persons – Switches, Controls, and Interlocks 18

  11. Protection Against Risk of Injury to Persons – Surface Temperatures 20

  12. Stability 20

  13. Strength of Handles 20

  14. Strength of Mounting 20

  15. Mechanical Assembly 21

  16. Liquid-Containing Parts 21

  17. Protection Against Corrosion 22

  18. Cord-Connected Products 22

  19. Permanently Connected Products 23

  20. Leads and Terminals 24

  21. Flexible Cords 26

  22. Strain Relief 27

  23. Bushings 28

24 Current-Carrying Parts ............................................................ .28A

25 Internal Wiring ................................................................... .28A

26 Protection of Wiring ............................................................... .28B

27 Wiring Connections ............................................................... .28B

1. Electrical Insulation 29

2. Separation of Circuits 31

3. Secondary Circuits 33

   1. General 33

   2. Extra-low-voltage circuits 33

4. Grounding 34

   1. General 34

   2. Permanently connected products 35

   3. Cord-connected products 36

   4. Bonding of internal parts 36

5. Bonding Means 37

6. Capacitors 38

7. Coil Windings 38

8. Heating Elements 39

9. Motors 39

   1. General 39

   2. Motor overload protection 40

   3. Short circuit protection 42

10. Overcurrent Protection 42

11. Protection Against Overheating 43

12. Receptacles 45

13. Switches and Controllers 45

14. Electrically Operated Valves and Solenoids 46

15. Spacings 46

16. Thermal Insulation 47

17. Wetting Live Parts 48

18. Internal Plumbing 48

19. Filters 48

20. Pressure Vessels and Parts Subjected to Pressure 48

21. Protection of Service Personnel 50

    1. General 50

    2. Construction 51

22. Duct- and Plenum-Mounted Products 53

23. Construction of Duct- and Plenum-Mounted Products 53

    1. Installation 53

    2. Polymeric material 53

    3. Evaporation pad 54

    4. Supply cord 54

       PERFORMANCE

24. General Test Parameters 54

    1. General 54

    2. Voltage 55

    3. Ambient temperatures 55

25. Leakage-Current Test 55

26. Humidity-Conditioning Test 56

27. Operation Test 57

28. Starting Test 57

29. Input Test 57

30. Normal-Temperature Test 58

    1. All products 58

    2. Duct- or plenum-mounted products 61

31. Disassembly and Reassembly Test 61

32. Impact 61

33. Rotating Members 62

34. Dielectric Voltage-Withstand Test 62

35. Strain-Relief Test 63

    1. General 63

    2. Through-cord switch 63

36. Power-Supply Cord Push-Back Relief Test 63

37. Cable-Clamp Test 63

38. Abnormal Operation Test 64

    1. General 64

39. Thermal Cutoff Test 64

40. Gasket Test 64

41. Liquid-Container Test 65

42. Flooding of Live Parts Test 65

43. Backflow Test 66

44. Bonding-Conductor Test 67

45. Tests on Parts Subject to Pressure 67

46. Mold Stress-Relief Test 68

    RATINGS

47. Electrical Ratings 69

    MARKING AND INSTRUCTIONS

48. Identification and Ratings 69

49. Informational and Instructional Markings 73

50. Operating Instructions 73

51. Field Wiring 74

TABLES AND FIGURES

Tables 76

Figures 87

SUPPLEMENT SA - SMART ENABLED HUMIDIFIERS

SA1 Scope 97

SA2 Construction 98

SA2.1 Controls 98

SA2.2 Separation of circuits 99

SA2.3 Communication and display devices 99

SA2.4 Communication conductors and cables 100

SA2.5 Communication connectors 100

SA2.6 Smart enabled or remote operation 100

SA3 Functional Safety 101

SA4 Resistance to Electro Magnetic Phenomena (Immunity) 101

SA5 Markings and Instructions 102

Annex A Standards for components

Annex B French translations and markings

Annex C Manufacturing and Production Tests

PREFACE

This is the harmonized CSA Group and UL Standard for Humidifiers. It is the fourth edition of CSA-C22.2 No. 104 and the fifth edition of UL 998. This harmonized standard has been jointly revised on April 4, 2016. For this purpose, CSA Group and UL are issuing revision pages dated April 4, 2016.

This harmonized Standard was prepared by CSA Group and Underwriters Laboratories Inc. (UL). The efforts and support of the Air Conditioning and Refrigeration Institute (ARI) and the Heating, Refrigerating and Air Conditioning Institute of Canada (HRAI) are gratefully acknowledged.

This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard.

This Standard was reviewed by the CSA Subcommittee on Humidifiers, under the jurisdiction of the CSA Technical Committee on Consumer and Commercial Products and the Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committee.

This standard has been approved by the American National Standards Institute (ANSI) as an American National Standard.

Application of Standard

Where reference is made to a specific number of samples to be tested, the specified number is considered a minimum quantity.

Note: Although the intended primary application of this standard is stated in its scope, it is important to note that it remains the responsibility of the users of the standard to judge its suitability for their particular purpose.

Level of Harmonization

This standard uses the IEC format but is not based on, nor is it considered equivalent to, an IEC standard. This standard is published as an identical standard for CSA Group and UL.

An identical standard is a standard that is exactly the same in technical content except for national differences resulting from conflicts in codes and governmental regulations. Presentation is word for word except for editorial changes.

Interpretations

The interpretation by the standards development organization of an identical or equivalent standard is based on the literal text to determine compliance with the standard in accordance with the procedural rules of the standards development organization. If more than one interpretation of the literal text has been identified, a revision is to be proposed as soon as possible to each of the standards development organizations to more accurately reflect the intent.

HUMIDIFIERS

INTRODUCTION

1. Scope

   
   

   1. These requirements cover humidifiers rated 600 V or less, and intended to be used in accordance with the National Electrical Code (NEC), ANSI/NFPA 70, and the Rules of the Canadian Electrical Code (CEC), Part I, C22.1.

      
      

   2. These requirements cover humidifiers intended for residential and commercial use. This includes humidifiers of the centrifugal atomizing type, evaporative-media type, water-injection type, steam type, and the like. The humidifiers may be for installation in a room, mounted on a wall or a ceiling, or for duct or plenum mounting.

      
      

   3. These requirements apply to equipment that includes an electric heating element to heat air or water, or both.

      
      

   4. These requirements do not apply to evaporative coolers that are also intended to be used for cooling.

      
      

   5. These requirements do not apply to portable, electrode-type products, such as vaporizers, which are covered by the Standard for Electric Heating Appliances, UL 499, and the CSA Standard for Household Cooking and Liquid-Heating Appliances, CAN/CSA-C22.2 No. 64.

      
      

2. Definitions

   
   

   1. The following definitions apply in this Standard:

Circuit, extra-low-voltage – A circuit that has an ac potential of not more than 30 V (42.4 peak), and power of 100 VA or less; or 30 V dc supplied by a primary battery; or supplied by a Class 2 transformer; or supplied by a combination of a transformer and fixed impedance that, as a unit, complies with all the performance requirements for a Class 2 transformer. A circuit that is derived from a circuit which exceeds 30 V by connecting resistance or impedance, or both, in series with the supply circuit to limit the voltage and current, is not considered to be an extra-low-voltage circuit.

Circuit, hazardous voltage – A circuit having characteristics in excess of those of an extra-low-voltage circuit.

Combination temperature-regulating and temperature-limiting thermostat – A thermostat whose function is to regulate the temperature under normal conditions of use, and that also serves to prevent a hazard that might result from conditions of abnormal operation of the heater.

Enclosure – The enclosure that houses the electrical components, live parts and/or moving parts. It may be an integral part of the component, a separate item, part of the ultimate enclosure, or the ultimate enclosure (e.g., the outer cabinet).

Heater element – A complete or partial assembly of a heating element, an electrical insulation (e.g., refractory, mica), a metal sheath, a glass or quartz envelope or panel, thermal insulation, and a frame or adaptor for holding the assembly together and fastening it in the heater; and leads or terminal connections, or both, which may or may not include bolts and nuts.