1、ANSI Z21.78-2010CSA 6.20-2010American National Standard/ CSA Standard ForCombination Gas Controls For Gas AppliancesStandards DevelopersAPPROVEDCSA AMERICA INC. 8501 East Pleasant Valley RoadCleveland, Ohio 44131CANADIAN STANDARDS ASSOCIATION5060 Spectrum Way, Suite 100Mississauga, Ontario, Canada L
2、4W 5N6Published - March 2011Copyright 2010Canadian Standards AssociationPermission 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 con
3、sult Canadian Standards Association, 5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N6.Copyright 2010CSA America, Inc.Permission is granted to republish material herein in laws or ordinances, and in regulations, administrative orders, or similar documents issued by public authoritie
4、s. Those desiring permission for other republication should consult CSA America, Inc., 8501 East Pleasant Valley Road, Cleveland, Ohio 44131.AMERICAN NATIONAL STANDARDANSI Z21.78-2010CSA STANDARDCSA 6.20-2010Fourth Edition - 2010This Standard is based on the Standard forCombination Gas Controls For
5、Gas AppliancesANSI Z21.78-2005 CSA 6.20-2005and Addenda Z21.78a-2007 CSA 6.20a-2007,Z21.78b-2008 CSA 6.20b-2008August 30, 2010American National Standards Institute, Inc.September 27, 2010Interprovincial Gas Advisory Council Effective in Canada April 1, 2012IGACThe Canadian Standards Association (CSA
6、), under whose auspices this National Standard has been produced, was chartered in 1919 and accredited by the Standards Council of Canada to the National Standards system in 1973. It is a not-for-profit, nonstatutory, voluntary membership association engaged in standards development and certificatio
7、n activities.CSA standards reflect a national consensus of producers and users including manufacturers, consumers, retailers, unions and professional organizations, and governmental agencies. The standards are used widely by industry and commerce and often adopted by municipal, provincial, and feder
8、al governments in their regulations, particularly in the fields of health, safety, building and construction, and the environment.Individuals, companies, and associations across Canada indicate their support for CSAs standards development by volunteering their time and skills to CSA Committee work a
9、nd supporting the Associations objectives through sustaining memberships. The more than 7000 committee volunteers and the 2000 sustaining memberships together form CSAs total membership from which its Directors are chosen. Sustaining memberships represent a major source of income for CSAs standards
10、development activities.The Association offers certification and testing services in support of and as an extension to its standards development activities. To ensure the integrity of its certification process, the Association regularly and continually audits and inspects products that bear the CSA M
11、ark.In addition to its head office and laboratory complex in Toronto, CSA has regional branch offices in major centres across Canada and inspection and testing agencies in eight countries. Since 1919, the Association has developed the necessary expertise to meet its corporate mission: CSA is an inde
12、pendent service organization whose mission is to provide an open and effective forum for activities facilitating the exchange of goods and services through the use of standards, certification and related services to meet national and international needs.LAssociation canadienne de normalisation (CSA)
13、, sous les auspices de laquelle cette Norme nationale a t prpare, a reu ses lettres patentes en 1919 et son accrditation au sein du Systme de Normes nationales par le Conseil canadien des normes en 1973. Association daffiliation libre, sans but lucratif ni pouvoir de rglementation, elle se consacre
14、llaboration de normes et la certification.Les normes CSA refltent le consensus de producteurs et dusagers de partout au pays, au nombre desquels se trouvent des fabricants, des consommateurs, des dtaillants et des reprsentants de syndicats, de corps professionnels et dagences gouvernementales. Lutil
15、isation des normes CSA est trs rpandue dans lindustrie et le commerce, et leur adoption divers ordres de lgislation, tant municipal et provincial que fdral, est chose courante, particulirement dans les domaines de la sant, de la scurit, du btiment, de la construction et de lenvironnement.Les Canadie
16、ns dun bout lautre du pays tmoignent de leur appui au travail de normalisation men par la CSA en participant bnvolement aux travaux des comits de la CSA et en appuyant ses objectifs par leurs cotisations de membres de soutien. Les quelque 7000 volontaires faisant partie des comits et les 2000 membre
17、s de soutien constituent lensemble des membres de la CSA parmi lesquels ses administrateurs sont choisis. Les cotisations des membres de soutien reprsentent une source importante de revenu pour les services de soutien la normalisation volontaire.LAssociation offre des services de certification et de
18、 mise lessai qui appuient et compltent ses activits dans le domaine de llaboration de normes. De manire assurer lintgrit de son processus de certification, lAssociation procde de faon rgulire et continue lexamen et linspection des produits portant la marque CSA.Outre son sige social et ses laboratoi
19、res Toronto, la CSA possde des bureaux rgionaux dans des centres vitaux partout au Canada, de mme que des agences dinspection et dessai dans huit pays. Depuis 1919, lAssociation a parfait les connaissances techniques qui lui permettent de remplir sa mission dentreprise, savoir la CSA est un organism
20、e de services indpendant dont la mission est doffrir une tribune libre et efficace pour la ralisation dactivits facilitant lchange de biens et de services par lintermdiaire de services de normalisation, de certification et autres, pour rpondre aux besoins de nos clients, tant lchelle nationale quint
21、ernationale.Canadian Standards AssociationFor further information on CSA services, write toCanadian Standards Association5060 Spectrum Way, Suite 100Mississauga, Ontario, Canada L4W 5N6Pour plus de renseignements sur les services dela CSA, sadresser Association canadienne de normalisation5060, Spect
22、rum Way, bureau 100Mississauga, Ontario, Canada L4W 5N6American National Standards InsitituteResponsibility of approving American National Standards rests with theAmerican National Standards Institute, Inc.25 West 43rd Street, Fourth FloorNew York, NY10036The American National Standards Institute (A
23、NSI), Inc. is the nationally recognized coordinator of voluntary standards development in the United States through which voluntary organizations, representing virtually every technical discipline and every facet of trade and commerce, organized labor and consumer interests, establish and improve th
24、e some 10,000 national consensus standards currently approved as American National Standards.ANSI provides that the interests of the public may have appropriate participation and representation in standardization activity, and cooperates with departments and agencies of U.S. Federal, state and local
25、 governments in achieving compatibility between government codes and standards and the voluntary standards of industry and commerce.ANSI represents the interests of the United States in international nontreaty organizations such as the International Organization for Standardization (ISO) and the Int
26、ernational Electrotechnical Commission (IEC). The Institute maintains close ties with regional organizations such as the Pacific Area Standards Congress (PASC) and the Pan American Standards Commission (COPANT). As such, ANSI coordinates the activities involved in the U.S. participation in these gro
27、ups.ANSI approval of standards is intended to verify that the principles of openness and due process have been followed in the approval procedure and that a consensus of those directly and materially affected by the standards has been achieved. ANSI coordination is intended to assist the voluntary s
28、ystem to ensure that national standards needs are identified and met with a set of standards that are without conflict or unnecessary duplication in their requirements.PrefaceThis publication represents a basic standard for safe operation, substantial and durable construction, and acceptable perform
29、ance of a combination gas control for gas appliances. It is the result of years of experience in the manufacture, testing, installation, maintenance, inspection and research on combination gas controls for gas appliances designed for utilization of gas. There are risks of injury to persons inherent
30、in appliances that, if completely eliminated, would defeat the utility of the appliance. The provisions in this standard are intended to help reduce such risks while retaining the normal operation of the appliance.Nothing in this standard is to be considered in any way as indicating a measure of qua
31、lity beyond compliance with the provisions it contains. It is designed to allow compliance of combination gas controls, the safety construction and performance of which may exceed the various provisions specified herein. In its preparation, full recognition has been given to possibilities of improve
32、ment through ingenuity of design. As progress takes place, revisions may become necessary. When they are believed desirable, recommendations or suggestions should be forwarded to the CSA America, 8501 East Pleasant Valley Road, Cleveland, Ohio 44131, or the Canadian Standards Association, 5060 Spect
33、rum Way, Suite 100; Mississauga, Ontario, Canada L4W 5N6.Safe and satisfactory operation of a combination gas control for 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,
34、ANSI Z223.1/NFPA 54; the Natural Gas and Propane Installation Code, CSA B149.1.Users of this American National Standard/CSA Standard are advised that the devices, products and activities within its scope may be subject to regulation at the Federal, Territorial, Provincial, state or local levels. Use
35、rs are strongly urged to investigate this possibility through appropriate channels. In the event of a conflict with this standard, the Federal, Territorial, Provincial, state or local regulation should be followed.THIS STANDARD IS INTENDED TO BE USED BY THE MANUFACTURING SECTOR AND BY THOSE APPLYING
36、 THE EQUIPMENT AND BY THOSE RESPONSIBLE FOR ITS PROPER INSTALLATION. IT IS THE RESPONSIBILITY OF THESE USERS TO DETERMINE THAT IN EACH CASE THIS STANDARD IS SUITABLE FOR AND APPLICABLE TO THE SPECIFIC USE THEY INTEND.CAUTION NOTICE: This American National Standard may be revised or withdrawn at any
37、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 ca
38、lling 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 pr
39、oducts certified by that organization should comply with this standard.iiHistory Of The Development Of Standard For Combination Gas Controls For Gas Appliances(This History is informative and is not part of the standard.)With the onset of the Free Trade Agreement between the United States and Canada
40、 on January 2, 1988, significant attention was given to the harmonization of the United States and Canadian safety standards addressing gas-fired equipment for residential, commercial and industrial applications. It was believed that the elimination of the differences between the standards would rem
41、ove potential trade barriers and provide an atmosphere in which North American manufacturers could market more freely in the United States and Canada. The harmonization of these standards was also seen as a step toward harmonization with international standards.At its December 11-12, 1990 meeting th
42、e Z21 Automatic Valves, Pressure Regulators and Combination Controls for Gas Appliances Subcommittee agreed with the CGA Standards Committee on Accessories for Gas-Fired Equipment to the development of a harmonized standard for combination gas controls, using the second draft of the proposed America
43、n National Standard for Combination Gas Controls for Gas Appliances. Subsequently, a proposed harmonized standard was distributed for industry review in Canada in April 1992.With the formation of joint subcommittees, a Canadian Gas Association Standards Steering Committee on Gas Burning Appliances a
44、nd Related Accessories was established to parallel Accredited Standards Committees Z21 and Z83, and to support the formation of joint subcommittees. Operating procedures, in accordance with American National Standards Institute procedures, for joint subcommittees were developed and subsequently appr
45、oved by ANSI on April 1, 1993.Following reconsideration of the proposed harmonized draft standard for combination gas controls, in light of comments received, the joint automatic gas controls subcommittee, by letter ballot dated October 24, 1994, adopted the proposed harmonized standard for combinat
46、ions gas controls and recommended the proposed harmonized standard to the Z21 Committee and the CGA Standards Steering Committee for approval.Following procedures, the Z21 Committee, at its April 6, 1995 meeting, adopted the proposed harmonized standard for combination gas controls for gas appliance
47、s. The CGA Standards Steering Committee adopted the proposed harmonized standard for combination gas controls for gas appliances by a letter ballot dated May 19, 1995.The first edition of the harmonized Z21/CGA Standard for Combination Controls for Gas Appliances was approved as American National St
48、andard by the American National Standards Institute, Inc. (ANSI), on July 15, 1996. The Interprovincial Gas Advisory Council (IGAC) approved the proposed harmonized standard by a letter ballot dated January 17, 1997.The second edition of the Z21/CSA Standard for Combination Controls for Gas Applianc
49、es was approved by the IGAC on August 22, 2000 and by ANSI, on September 27, 2000.The third edition of Z21/CSA Standard for Combination Controls for Gas Appliances was approved by the IGAC on April 1, 2005 and by ANSI on March 9, 2005.This the fourth edition of the Standard was approved by the IGAC on September 27, 2010, and by ANSI on August 30, 2010.The previous edition of the combination controls for gas appliances standard, and addenda thereto, approved by ANSI and the IGAC
