C22.2 No. 236-11

Heating and cooling equipment

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CSA Standards Update Service

C22.2 No. 236-11

October 2011

Title: Heating and cooling equipment

Pagination: 148 pages each dated October 2011

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  CSA Standard

  
  

  C22.2 No. 236-11

  Heating and cooling equipment

  
  

  
  

  
  

  
  

  
  

  Published in October 2011 by Canadian Standards Association A not-for-profit private sector organization

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  ISBN 978-1-55491-572-9

  © Canadian Standards Association — 2011

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

  
  

  Canadian Standards Association CSA C22.2 No. 236-11

  Fourth Edition

  
  

  Underwriters Laboratories Inc. UL 1995

  Fourth Edition

  
  

  Heating and Cooling Equipment

  
  

  October 14, 2011

  
  

  ANSI/UL 1995-2011

  Commitment for Amendments

  
  

  This standard is issued jointly by the Canadian Standards Association (CSA) and Underwriters Laboratories Incorporated (UL). Comments or proposals for revisions on any part of the standard may be submitted to CSA or UL at any time. Revisions to this standard will be made only after processing according to the standards development procedures of CSA and UL. CSA 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 978-1-55491-572-9 © 2011 Canadian Standards Association

  
  

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  CONTENTS

  Preface 6

  1. Scope 8

  2. Definitions 10

  3. Reference publications 13

  4. Installation and operating instructions 14

     CONSTRUCTION

  5. Enclosures 15

  6. Thickness of sheet metal enclosures for uninsulated live parts 19

  7. Openings in enclosures 22

  8. Enclosures, doors, and covers 25

  9. Accessibility of parts 26

  10. Assembly 26

  11. Mechanical protection 27

  12. Outdoor use equipment 29

  13. Enclosures, outdoor use 30

  14. Field wiring connections, outdoor use equipment 31

  15. Mechanical assembly 31

  16. Auxiliary devices 32

  17. Connection to power supply 33

  18. Thermal insulation and air filters 35

  19. Terminal parts and leads for field wiring connections 37

  20. Internal wiring 41

  21. Separation of circuits 45

  22. Electrical insulation 47

  23. Motors 47

  24. Grounding and bonding 53

  25. Mounting of components 55

  26. Switches and controllers 55

  27. Transformers 58

  28. Capacitors 60

  29. Electric crankcase heaters 61

  30. Electric heaters 61

  31. Receptacles 64

  32. Control circuits 65

  33. Spacings 67

  34. Refrigerant, hot water, and steam coils 70

  35. Heat pump water heating equipment 77

      UNIT MARKINGS

  36. General 78

  37. Equipment markings 78

  38. Other markings 88

      TESTS

  39. General test parameters 90

  40. Input test 102

  41. Temperature operation test – without any supplementary heating means 102

  42. Temperature operation tests–with hot water or steam heating 103

  43. Cooling operation test–temperature and pressure 103

  44. Heating operation test – temperature and pressure 104

  45. Abnormal temperature and pressure tests – refrigerant heat only 104

  46. Electric heater tests 105

  47. Abnormal temperature and pressure tests 107

  48. Backup protection tests 110

  49. Fan delay test – duct-connected downflow and horizontal units 111

  50. Control system failure test 111

  51. Fan motor failure test 112

  52. Motors for use with wave chopping solid-state speed controls 112

  53. Condenser water failure test 113

  54. Dielectric voltage–withstand test 114

  55. Condensate drain blockage test 115

  56. Loading test 115

  57. Limited short-circuit test 115

  58. Transformer – burnout test 116

  59. Transformer – overload test 117

  60. Rain test 117

  61. Accelerated aging tests 120

  62. Impact test 122

  63. Strength tests 123

  64. Fatigue test analysis 123

  65. Rupture member tests 125

  66. Fusible plug test 126

  67. Regulating relief valve endurance test 126

  68. Leakage current test – cord-connected products 127

  69. Starting test 130

  70. Strain relief 130

  71. Power supply cords 130

  72. Heat pump water heating equipment 131

  73. Ultraviolet light exposure test 133

  74. Water exposure and immersion test 133

      MANUFACTURING AND PRODUCTION TESTS

  75. Knockout security test 133

  76. Pressure tests for leakage and strength 133

  77. Production fatigue tests 135

  78. Production line dielectric voltage-withstand tests 135

  79. Production line grounding continuity test 135

  80. Flexing test 136

      CSA, UL AND OTHER STANDARDS AND CODES

  81. Standards for components 136

  82. Other Standards and codes 143

ANNEX A (Informative)

Marking Translations

ANNEX B (Informative)

Hot, Flaming Oil Test and Molten PVC and Copper Test

B1 General 146

B2 Hot flaming oil 146

B3 Molten PVC and copper 146

Preface

This is the harmonized CSA and UL standard for Heating and Cooling Equipment. It is the fourth edition of CSA–C22.2 No. 236 and the fourth edition of UL 1995. This edition of CSA–C22.2 No. 236 and UL 1995 supersedes the previous editions published in 1995, 1990 and 2005.

This harmonized standard was prepared by Canadian Standards Association and Underwriters Laboratories Inc. The efforts and support of the heating and cooling equipment industry, 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 Appliances for Air-Conditioning for Household and Similar Purposes, under the jurisdiction of the CSA Technical Committee on Consumer and Commercial Products and the CSA Strategic Steering Committee on the Requirements for Electrical Safety, and has been formally approved by the CSA Technical Committees. It was also reviewed by the UL Standards Technical Panel 1995 and processed according to the method of development, revision, and implementation of UL standards for safety.

This Standard has been approved as a National Standard of the U.S.A. by the American National Standards Institute (ANSI).

Where reference is made to a specific number of specimens to be tested, the specified number is to be 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 is published as an identical Standard. 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.

UL Effective Date

This standard is now in effect for all products except for paragraphs 1.11, 2.1, 18.2, 18.10, 20.1, 20.12,

20.18, 26.10, 26.20, 28, 30.15, 31, item (j) of 37.3, 38.16, 48.1, 52, 54.2, 54.3, 56.3, 56.4, 61.5 – 61.8 and

80 which become effective on October 14, 2014.

A UL effective date is one established by Underwriters Laboratories Inc. and is not part of the ANSI approved standard.

CSA Effective Date

The effective date for CSA International will be announced through CSA Informs or a CSA certification notice.

Heating and cooling equipment

1. Scope

   
   

   1. These requirements apply to the following stationary equipment for use in nonhazardous locations rated 7200 V or less, single- or 3-phase, and remote control assemblies for such equipment:

      
      

      1. Heat pumps, for heating and cooling with or without factory, or field-installed electric resistance heaters, or hot water or steam heating coils.

         
         

      2. Air conditioners for cooling with or without factory, or field-installed electric resistance heaters, or hot water or steam heating coils.

         
         

      3. Cooling portion and associated components of combination heating and cooling equipment employing gas-, oil-, or gas-oil-fired heating means. However, the requirements for the construction and performance of the gas-, oil-, or gas-oil-fired heating means, and their associated components, are to conform to the particular standards covering such heating equipment and components.

         
         

      4. Liquid chillers and compressor-evaporator or liquid chiller assemblies intended for use with remote condensers.

         
         

      5. Condensing units intended for connection to a remote nonspecified evaporator and compressor units intended for connection to a remote nonspecified evaporator and condenser.

         
         

      6. Add-on heat pumps for comfort heating or heating and cooling.

         
         

      7. Heat pump water heaters and refrigerant desuperheaters, and packaged heat pump water heaters consisting of a heat pump water heater and an associated storage tank.

         
         

      8. Fan units and fan coil units for comfort heating and/or comfort cooling.

         
         

      9. Room fan heater units, central heating furnaces, and similar fixed electric space heating for comfort heating.

         
         

   2. The units referenced in Clause 1.1(g), self-contained heat pumps and air conditioners may be cord-connected if they

      
      

      1. are for indoor use only;

         
         

      2. are rated 250 V or less, single phase, with a marked rating of 24 A or less; and

         
         

      3. comply with Clause 1.11.

         
         

   3. A fan unit includes a motor-operated fan or blower and is intended to be connected to a duct system that supplies conditioned air for environmental heating and/or cooling. Such a unit may have air-controlled dampers, but does not include a factory-installed heat exchanger or any other integral heating or cooling means.