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CSA C22.2 NO. 104-11 (R2015) Humidifiers (Bi-national standard, with UL 998), Includes Update No. 1 (2016)
standard by CSA Group, 04/01/2011
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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:
Revised | Title page, copyright page, and Preface, Clauses 3.2.1, 5.2.5, 5.3.2, 19.14, 25.5, 31.2.2, 36.1.1, 36.2.2, 36.2.3, 36.2.11, and 56.1, Supplement SA, and Annex A |
New | Clause 25.7 and Figure 8A |
Deleted | None |
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
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.
UL’s Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of UL’s Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL.
This ANSI/UL Standard for Safety consists of the Fifth Edition including revisions through April 4, 2016. The most recent designation of ANSI/UL 998 as an American National Standard (ANSI) occurred on April 4, 2016. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page (front and back), or the Preface.
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 UL’s On-Line Collaborative Standards Development System (CSDS) at https://csds.ul.com.
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CONTENTS
PREFACE 6
INTRODUCTION
Scope 7
Definitions 7
General 9
Components 9
Reference publications 10
3.3 Units of measurement ....................................................... .10B
3.4 Terminology 11
CONSTRUCTION
General 11
Enclosures 11
General 11
Nonmetallic materials 13
Enclosure integrity 14
Doors and Covers 15
Accessibility of Uninsulated Hazardous Voltage Live Parts and Film-Coated Wire 16
Protection Against Risk of Injury to Persons – Mechanical Protection 17
Protection Against Risk of Injury to Persons – Materials 18
Protection Against Risk of Injury to Persons – Switches, Controls, and Interlocks 18
Protection Against Risk of Injury to Persons – Surface Temperatures 20
Stability 20
Strength of Handles 20
Strength of Mounting 20
Mechanical Assembly 21
Liquid-Containing Parts 21
Protection Against Corrosion 22
Cord-Connected Products 22
Permanently Connected Products 23
Leads and Terminals 24
Flexible Cords 26
Strain Relief 27
Bushings 28
24 Current-Carrying Parts ............................................................ .28A
25 Internal Wiring ................................................................... .28A
26 Protection of Wiring ............................................................... .28B
27 Wiring Connections ............................................................... .28B
Electrical Insulation 29
Separation of Circuits 31
Secondary Circuits 33
General 33
Extra-low-voltage circuits 33
Grounding 34
General 34
Permanently connected products 35
Cord-connected products 36
Bonding of internal parts 36
Bonding Means 37
Capacitors 38
Coil Windings 38
Heating Elements 39
Motors 39
General 39
Motor overload protection 40
Short circuit protection 42
Overcurrent Protection 42
Protection Against Overheating 43
Receptacles 45
Switches and Controllers 45
Electrically Operated Valves and Solenoids 46
Spacings 46
Thermal Insulation 47
Wetting Live Parts 48
Internal Plumbing 48
Filters 48
Pressure Vessels and Parts Subjected to Pressure 48
Protection of Service Personnel 50
General 50
Construction 51
Duct- and Plenum-Mounted Products 53
Construction of Duct- and Plenum-Mounted Products 53
Installation 53
Polymeric material 53
Evaporation pad 54
Supply cord 54
PERFORMANCE
General Test Parameters 54
General 54
Voltage 55
Ambient temperatures 55
Leakage-Current Test 55
Humidity-Conditioning Test 56
Operation Test 57
Starting Test 57
Input Test 57
Normal-Temperature Test 58
All products 58
Duct- or plenum-mounted products 61
Disassembly and Reassembly Test 61
Impact 61
Rotating Members 62
Dielectric Voltage-Withstand Test 62
Strain-Relief Test 63
General 63
Through-cord switch 63
Power-Supply Cord Push-Back Relief Test 63
Cable-Clamp Test 63
Abnormal Operation Test 64
General 64
Thermal Cutoff Test 64
Gasket Test 64
Liquid-Container Test 65
Flooding of Live Parts Test 65
Backflow Test 66
Bonding-Conductor Test 67
Tests on Parts Subject to Pressure 67
Mold Stress-Relief Test 68
RATINGS
Electrical Ratings 69
MARKING AND INSTRUCTIONS
Identification and Ratings 69
Informational and Instructional Markings 73
Operating Instructions 73
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
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.
INTRODUCTION
Scope
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.
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.
These requirements apply to equipment that includes an electric heating element to heat air or water, or both.
These requirements do not apply to evaporative coolers that are also intended to be used for cooling.
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.
Definitions
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.