ANSI Z21.1-2010

American National Standard For Household Cooking Gas Appliances

American National Standard ANSI Z21.1-2010

Twenty-Ninth Edition - 2010

This Standard is based on the standard for Household Cooking Gas Appliances

ANSI Z21.1-2005 ANSI Z21.1a-2007 ANSI Z21.1b-2008

Approved November 17, 2010

American National Standards Institute, Inc.

Standards Deveolper CSA America, Inc.

8501 East Pleasant Valley Rd.

Cleveland, OH 44131

Published - January 2011

Copyright © 2011 CSA America, Inc.

Permission is granted to republish material herein in laws or ordinances, and in regulations, administrative orders, or similar documents issued by public authorities. Those desiring permission for other republication should consult CSA America, Inc., 8501 East Pleasant Valley Road, Cleveland, Ohio 44131.

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Preface

This publication represents a basic standard for safe operation, substantial and durable construction, and acceptable performance of household cooking gas appliances. It is the result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on household cooking gas appliances designed for the utilization of gas. There are risks of injury to persons inherent in some appliances that, if completely eliminated, would defeat the utility of the appliance. The provisions in this Standard are intended to reduce such risks while retaining the normal function of the appliance.

Nothing in this standard is to be considered in any way as indicating a measure of quality beyond compliance with the provisions it contains. It is designed to allow compliance of household cooking gas appliances, the safety construction and performance of which may exceed the various provisions specified herein. In its preparation, recognition has been given to possibilities of improvement through ingenuity of design. As technical advances take place, revisions may become necessary. When they are believed desirable, recommendations or suggestions should be forwarded to the Chairman of Accredited Standards Committee Z21/83, 8501 East Pleasant Valley Road, Cleveland, Ohio 44131. A proposal form is provided in the back of this document.

Safe and satisfactory operation of household cooking gas appliances depends to a great extent upon its proper installation, use and maintenance. It should be installed, as applicable, in accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54; the (U.S.) Manufactured Home Construction and Safety Standard, Title 24 CFR, Part 3280, or when such standard is not applicable, the Standard for Fire Safety Criteria for Manufactured Home Installations, Sites, and Communities, ANSI/NFPA 501A, manufacturers' installation instructions, and local municipal building codes.

Users of this American National Standard are advised that the devices/products/activities within its scope may be subject to regulation at the Federal state or local level. Users are strongly urged to investigate this possibility through appropriate channels. In the event of a conflict with this standard, the Federal, state or local regulation should be followed.

CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute, Inc., require that action be taken to reaffirm, revise or withdraw this standard no later than five (5) years from the date of approval. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute, Inc., 25 West 43rd Street, Fourth Floor, New York, N.Y. 10036, (212) 642-4900.

EFFECTIVE DATE: An organization using this standard for product evaluation as a part of its certification program will normally establish the date by which all products certified by that organization should comply with this standard.

History Of The Development Of The Standard For Household Cooking Gas Appliances

(This History is informative and is not part of the standard.)

The first definite step toward the preparation of gas range specifications appears to have been taken by The Philadelphia Gas Works Company in 1903, after several years' observation had indicated the desirability of preparing general specifications which would enable manufacturers to build their ranges to meet certain specific requirements.

In Volume 4 of the 1909 Proceedings of the American Gas Institute there is a report of the Committee on Utilization of Gas Appliances which includes the specifications in use by two large purchasers of gas ranges. In the 1912 proceedings: (1) specifications for gas ranges were submitted for approval which had been prepared jointly by the Committee of the American Gas Institute and a similar Committee of the National Commercial Gas Association, and (2) recommendation was made that a standing committee be appointed to continue the standardization and simplification of gas appliance specifications.

These specifications were revised several times between 1914 and 1918. In June 1918 the American Gas Institute and the National Commercial Gas Association amalgamated to form the American Gas Association. During 1919 a Committee on Standardization of Gas Appliances was formed by the American Gas Association to carry out revisions of existing gas appliance specifications.

In 1925 the Subcommittee on Approval Requirements for Domestic Gas Ranges was formed for the purpose of revising existing standards of the American Gas Association and placing them in a form adaptable to industry's needs and readily capable of enforcement by the newly created Testing Laboratories of the American Gas Association. The first American Gas Association Approval Requirements for Gas Ranges were released to the gas industry in 1926. Revised editions were published in 1928 and 1930.

In September 1930, the American Gas Association Approval Requirements Committee became Sectional Committee Z21 of the American Standards Association. Consequently, the Subcommittee on Approval Requirements for Domestic Gas Ranges became a subcommittee of the Z21 Committee.

During 1930 and 1931, general revision and enlargement of the standards were undertaken by the subcommittee and the Z21 Committee. The resulting standard, the most comprehensive ever issued for gas ranges, was submitted to the American Standards Association for adoption and accepted in 1932.

Revisions to this standard reflecting the latest developments and improvements were approved by the subcommittee during 1932. This draft standard was adopted by the Z21 Committee at its May, 1933 meeting and approved as American Standard by the American Standards Association in 1933. Following this procedure, seven subsequent editions of this standard were approved by the American Standards Association from 1935 to 1955.

Up to this point, the domestic gas range standard (Z21.1) covered both free-standing and built-in cooking units; however, in view of the rapid development of built-in units (formerly classified as recessed range sections) as well as other considerations as to the testing of these types of units, it was deemed advisable to have a separate standard devoted to each type of appliance. Consequently, the standard was divided

into two volumes: the fourteenth edition, Volume I, Free-Standing Units (Z21.1.1), and the first edition, Volume II, Built-In Domestic Cooking Units (Z21.1.2), which were approved as American Standard by the American Standards Association in 1956. New editions of Z21.1.1 and Z21.1.2 were approved in 1959.

As a result of the use of domestic gas ranges by the trailer coach and mobile home industry, the standards were modified to cover the special cons-truction and performance features deemed necessary for ranges for installation in such vehicles. These revisions were included in first addenda to the standards approved as American Standards in 1960. Subsequent editions of both standards were approved in 1961 and 1964.

Continued progress in the development of domestic gas ranges prompted further revision of the standards. In the first addenda (Z21.1.1a-1965 and Z21.1.2a-1965) issued to the seventeenth edition of Z21.1.1 and the fourth edition of Z21.1.2, provisions covering outdoor gas broilers were incorporated.

In August 1966, the American Standards Association was reconstituted as the United States of America Standards Institute. As a result, the eighteenth edition of Z21.1.1 and the fifth edition of Z21.1.2, were approved as USA Standards by the United States of America Standards Institute in 1967.

In October 1969, the United States of America Standards Institute was renamed the American National Standards Institute, Inc.

As a result of continued progress and development of domestic cooking equipment designs plus the increasing similarity of some designs of free-standing and built-in ranges, the subcommittee concluded that reorganization and expansion of the domestic gas range standards was needed to adequately cover various types of cooking equipment. Accordingly, three draft standards were distributed for review and comment during September 1970: coverage for outdoor broilers contained in the existing standards, plus added coverage for outdoor top cooking units, was combined into a draft standard for outdoor cooking gas appliances; coverage for appliances for use with liquefied petroleum gases and for installation in travel trailers, as contained in the existing standards, was combined into a separate draft standard for recreational vehicle cooking appliances; and the remainder of Z21.1.1 and Z21.1.2 was combined into a draft standard for household cooking gas appliances.

The nineteenth edition of the former domestic gas range standards, Z21.1.1 and Z21.1.2, retitled and redesignated the American National Standard for Household Cooking Gas Appliances, Z21.1, was approved as American National Standard in 1972.

Further revisions in line with developments in gas utilization, including transfer of the remaining coverage for appliances for recreational vehicle installation to American National Standard for Recreational Vehicle Cooking Gas Appliances, Z21.57, were incorporated in the twentieth edition of the household cooking gas appliance standard which was approved as American National Standard by the American National Standards Institute, Inc., in 1974.

The twenty-first, twenty-second, twenty-third, twenty-fourth, twenty-fifth, twenty-sixth, twenty-seventh and twenty-eighth editions of the household cooking gas appliance standards were approved as American National Standards by the American National Standards Institute, Inc., in 1978, 1982, 1987, 1990, 1993,

1996, 2000 and 2005 respectively.

Following the procedures outlined above, further revisions to this standard, Z21.1, were developed in line with industry developments. This, the twenty-ninth edition of the household cooking gas appliance standard, was approved as an American National Standard by the American National Standards Institute, Inc. on November 17, 2010.

Previous editions of the household cooking gas appliance standard, and addenda thereto, approved by the American National Standards Institute or its predecessor organizations are as follows:

The following identifies the designation and year of the twenty-ninth edition of the standard: ANSI Z21.1-2010

NOTE: This edition of Z21.1 incorporates changes to the 2005 edition and addenda thereto. Changes other than editorial, are denoted by a vertical line in the margin.

Z21/83 Committee on Performance and Installation of Gas Burning Appliances and Related Accessories

DARYL L. HOSLER, Chairman PAUL E. BEACH, Vice Chairman

REPRESENTING AIR-CONDITIONING, HEATING & REFRIGERATION INSTITUTE:

REPRESENTING AMERICAN ASSOCIATION OF FAMILY AND CONSUMER SERVICES:

JoAnn Emmel

REPRESENTING AMERICAN GAS ASSOCIATION:

James A. Ranfone

REPRESENTING ASSOCIATION OF HOME APPLIANCE MANUFACTURERS:

Matthew Williams

REPRESENTING ATMOS ENERGY:

Ronnie Ray Frazier

REPRESENTING BURNER TECHNOLOGY UNLIMITED, INC.:

Carl Suchovsky

REPRESENTING CONSUMERS:

Amy B. Sherwin Hall Virgil

REPRESENTING DIRECT ENERGY INC.:

Geoff Atkinson

REPRESENTING INDIVIDUAL MEMBERS:

Daryl L. Hosler (Non-Voting) Issac Sargunam

Z21/83 Committee on Performance and Installation of Gas Burning Appliances and Related Accessories (con’t.)

REPRESENTING LOWE’S COMPANIES, INC.:

George Ruzicka

REPRESENTING NATIONAL GRID:

Edward J. Angelone John Rathbun (Alternate)

REPRESENTING NATIONAL PROPANE GAS ASSOCIATION:

Bruce J. Swiecicki

REPRESENTING NORTH AMERICAN ASSOCIATION OF FOOD EQUIPMENT MANUFACTURERS:

Charlie Souhrada Terry Wiseman (Alternate)

REPRESENTING SOUTHERN CALIFORNIA GAS COMPANY:

Lance DeLaura Ron S. Caudle (Alternate)

REPRESENTING UNDERWRITERS LABORITORIES:

Robert Wozniak Travis Hardin (Alternate)

REPRESENTING U.S. CONSUMER PRODUCT SAFETY COMMISSION:

Donald W. Switzer Ronald Jordan (Alternate) (Non-Voting)

Technical Advisory Group On Standards For Domestic Gas Ranges

Alan Wasetis, Chairman Terrence Adams

Thomas Chodacki Richard Clinton David Delaquila Craig Fernandes James Goins

Ed Grzesik Pete Hoekstra James Hurley Susana Katz David Kinny Donna Linzey Brian Orloff Allen Pirro Mike Pryor Joe Rose Todd Smith

Carl Suchovsky Aaron Tuck

Contents

Part I Construction

Page

1. Construction 1

2. Scope 1

3. General Construction And Assembly 3

4. Appliance Structure 6

5. Bases, Legs, Casters And Frames 8

6. Glass/Ceramic Panels 10

7. Stability Tests 12

8. Gas Supply Lines 14

9. Manual Valves And Other Energy Controlling Devices 15

10. Gas Appliance Pressure Regulators 17

11. Automatic Valves 19

12. Thermostats 19

13. Orifices And Orifice Fittings 20

14. Main Burner And Pilot Input Ratings 20

15. Burners 21

16. Top Surface Cooking Section Burner Lighters 23

17. Automatic Gas Ignition Systems 24

18. Pilot Gas Filters 26

19. Cooking Tops, Surface Cooking Section Covers And Drip Trays 27

20. Oven And Broiler Linings And Oven Bottoms 27

21. Oven Racks, Rack Supports And Broiler Pans 28

22. Thermal Insulation 29

23. Venting And Combustion Air Supply 29

24. Fan And Limit Controls 30

25. Flue Collars 30

26. Flue Deflectors 31

27. Electrical Equipment And Wiring 31

28. Instructions 38

29. Marking 44

Part II Performance

1. Performance 53

2. General 53

3. Test Gases 55

4. Test Pressures And Burner Adjustments 56

5. Combustion* 57

6. Burner And Pilot Operating Characteristics 61

7. Top Surface Cooking Section Burner Lighters 65

8. Ignition Systems 68

9. Piloted Ignition Systems 73

10. Direct Ignition Systems 76

11. Proved Igniter Systems 79

12. Manual Gas Valves 81

13. Gas Appliance Pressure Regulators 82

14. Automatic Valves 82

15. Thermostats 82

16. Oven Heating Capacity 86

    Contents (Continued)

    Page

17. Oven Heat Distribution* 87

18. Broiler Temperature 89

19. Broiler Heat Distribution 91

20. Broiler Performance 91

21. Evaluation Of Clothing Ignition Potential 92

22. Evaluation Of Burn Hazard Potential Of Exterior Surfaces 95

23. Temperatures Of Handles, Knobs And Touchpads 96

24. Wall, Floor And Enclosure Temperatures 97

25. Abnormal Operation Stalled-Fan Test 100

26. Flue Gas Temperature 101

27. Draft Hoods 101

28. Exhaust Hood Outlet Air Temperature 103

29. Oven Flue Discharge Temperatures 103

30. Performance Of Appliances Provided With Pyrolytic

    Self-Cleaning Oven Or Self-Cleaning Broiler Features 104

31. Performance Of An Appliance Incorporating A

    Microwave Cooking Section 111

32. Marking Material Adhesion And Legibility 111

33. Safety Circuit Analysis 112

Tables

Table I Door Loading 114

Table II Minimum Acceptable Wall Thickness

For Aluminum Semi-Rigid Tubing 114

Table III Maximum Tubing And Fitting Temperatures 115

Table IV Oven Rack Loading 115

Table V Maximum Allowable Rise Above Room

Temperature For Various Component Parts (*1) 116

Table VI 117

Table VII Maximum Allowable Motor Winding Temperatures, °F (°C) 117

Table VIII Characteristics Of Test Gases 118

Table XI Inlet Test Pressures 118

Table X Gas Pressure And Input Conditions For

Use In The Various Performance Tests 119

Table XI Maximum Surface Temperature, °F (°C)* 120

Table XII Maximum Handle And Knob Temperatures, °F (°C)*

(As measured by thermocouples) 120

Table XIII Test Conditions For Wall, Floor And Enclosure Temperature Tests 121

Figures

Figure 1. Test Conditions For Wall, Floor And Enclosure Temperature Tests 121

Figure 2. Example of Apparatus for Determining Strength of

Floor-Supported Unit Bodies, as Set-Up for Testing End Frames 124

Figure 3. Typical Floor-Supported Cooking Units 124

Figure 4. Recommended Dimensions for D-Shaped Handle Cavity

for Valve Stems of 11/32 in (8.7 mm) Diameter 125

Figure 5. Test Structure for Built-In Top Surface Cooking

Units and Open Top Broiler Units 126

Contents (Continued)

Figure 6. Test Enclosure for Testing Built-In Oven and

Page

Enclosed Broiler Units 127

Figure 7. Location of Temperature Indicating Devices for Determination of Ambient Room Temperature During Test for Wall,

Floor and Enclosure Temperatures 127

Figure 8. Range Top Burner Test Utensil 128

Figure 9. Shielded Thermocouple Between Two 1 in (25.4 mm)

Squares of 1/16 in (1.6 mm) Aluminum 129

Figure 10. Griddle Plate Used in Combustion Test 129

Figure 11. Arrangement of Test Apparatus Simulating Reaching for

Controls or Performing Cooking Operations 130

Figure 12. Arrangement of Test Apparatus Simulating Both Reaching

for Controls or Performing Cooking Operations and Oven Usage 130

Figure 13. Surfaces Surrounding a Knob or Control and Subject to Contact 131

Figure 14. Temperature-Measuring and Accessibility Probe 132

Figure 15. Test Structure for Floor-Supported Units Not

Having Elevated Cooking Sections 133

Figure 16. Test Structure for Floor-Supported Units

Having Elevated Cooking Sections 134

Figure 17. Method of Sealing Annuli Around Vent During

Wall and Enclosure Temperature Tests 135

Figure 18. Method of Mounting Thermocouple 135

Figure 19. Typical Device for Measuring Oven Flue Discharge Temperatures 136

Figure 20. Samples Failure Modes and Effects Analysis for

Component Miswiring* 136

Part III Manufacturing And Production Tests 137

Part Definitions 139

EXHIBIT A List Of Referenced Standards 149

EXHIBIT B (Optional) Provisions For Listed Gas Appliance Conversion Kits 153

Appendices

APPENDIX A Pertinent References to ANSI Y14.15 157

APPENDIX B Wire color designations 158

APPENDIX C Recommended wire color usage 159

Contents (Continued)

APPENDIX D Preferred graphic symbols of commonly used Items, extracted from Standard ANSI/IEEE 315, Graphic symbols for electrical and electronics diagrams, and

Page

abbreviations for these items 160

APPENDIX E Table of Conversion Factors 162

NOTE

This standard contains SI (Metric) equivalents to the yard/pound quantities, the purpose being to allow the standard to be used in SI (Metric) units. (Standard for use of the International System of Units (SI): The Modern Metric System, IEEE/ASTM SI I0 or Metric Practice Guide, CAN/CSA Z234.1 are used as a guide in making metric conversion from yard/pound quantities.) If a value for a measurement and an equivalent value in other units, the first stated is to be regarded as the requirement. The given equivalent value may be approximate. If a value for a measurement and an equivalent value in other units, are both specified as a quoted marking requirement, the first stated unit, or both shall be provided.

American National Standard For Household Cooking Gas Appliances

Part I: Construction

1.1 Scope

1.1.1

This standard applies to newly produced household cooking gas appliances (see Part IV, Definitions), hereinafter referred to as units or appliances, constructed entirely of new, unused parts and materials. These appliances may be floor supported or built-in.

1.1.2

This standard applies to household cooking gas appliances:

1. For use with natural gas;

   
   

2. For use with manufactured gas;

   
   

3. For use with mixed gas;

   
   

4. For use with liquefied petroleum gases;

   
   

5. For use with LP gas-air mixtures;

   
   

6. For use with either natural, manufactured or mixed gas and convertible for use with liquefied petroleum gases (see Part IV, Definitions);

   
   

7. For manufactured (mobile) home installation for use with liquefied petroleum gases only (see 1.2.25);

   
   

8. For manufactured (mobile) home installation for use with either natural, manufactured or mixed gas and convertible for use with liquefied petroleum gases (see 1.2.25 and Part IV, Definitions);

   
   

9. For Recreational Park Trailer installation for use with natural, manufactured, or mixed gases and convertible for use with liquefied petroleum gases (see 1.2.25 and Part IV, Definitions); and

   
   

10. Provided with pyrolytic self-cleaning oven features or self-cleaning broiler features, or both (see 1.2.26).

The construction of floor-supported units and built-in units for use with the above-mentioned gases is covered under Part I.

The performance of floor-supported units and built-in units for use with the above-mentioned gases is covered under Part II.