1、ANSI Z21.8 1994 INSTALLATION OF DOMESTIC GAS CONVERSION BURNERS Eighth Edition - 1994Printed in U.S.A.byAmerican Gas Association Laboratories8501 East Pleasant Valley RoadCleveland, Ohio 44131ApprovedFebruary 14, 1994AMERICAN NATIONALSTANDARDS INSTITUTE, INC.Copyright 1994, AMERICAN GAS ASSOCIATIONP
2、ermission is granted to republish material herein in laws orordinances, and in regulations, administrative orders, or similardocuments issued by public authorities. Those desiring permissionfor other republication should consult the American GasAssociation Laboratories, 8501 East Pleasant Valley Roa
3、d,Cleveland, Ohio 44131.Printed in U.S.A.PREFACEThis text outlines fundamental criteria for the installation ofdomestic gas conversion burners in house heating and waterheating appliances. The provisions are the cumulative results ofyears of experience in the installation of such devices in centralh
4、eating equipment originally utilizing solid fuel or oil and areintended to promote public safety by providing guidelines for thesafer and more satisfactory utilization of gas.During the preparation of thest guidelines, due considerationwas given to the fact that they are to be national in scope ands
5、ufficiently general to encompass conditions existing in variousgeographic locations. Furthermore, those conversion burnersinstalled should be in full compliance with the specifications forsafe operation, substantial and durable construction and acceptableperformance as contained in the Standard for
6、Domestic GasConversion Burners, ANSI Z21.17.As progress is made in the utilization of gas, revisions to theseguidelines may become necessary. When they are believed desirable,recommendations should be forwarded to the Chairman ofAccredited Standards Committee Z21, 8501 East Pleasant ValleyRoad, Clev
7、eland, Ohio 44131.Safe and satisfactory operation of a installation of domestic gasconversion burners depends to a great extent upon its properinstallation, and it should be installed in accordance with theNational Fuel Gas Code, ANSI Z223.1; manufacturers installationinstructions and local municipa
8、l codes.Users of this American National Standard are advised that thedevices/products/activities within its scope may be subject toregulation at the Federal state or local level. Users are stronglyurged to investigate this possibility through appropriate channels.In the event of a conflict with this
9、 standard, the Federal, state orlocal regulation should be followed.CAUTION NOTICE:MThis American National Standard may berevised or withdrawn at any time. The procedures of the AmericanNational Standards Institute, Inc., require that action be taken toreaffirm, revise or withdraw this standard no l
10、ater than five (5)years from the date of approval. Purchasers of American NationalStandards may receive current information on all standards bycalling or writing the American National Standards Institute, Inc.,11 West 42nd Street, New York, N.Y. 10036, (212) 642-4900.EFFECTIVE DATE:MAn organization
11、using this standard forproduct evaluation as a part of its certification program willnormally establish the date by which all products certified by thatorganization should comply with this standard.HISTORY OF THE DEVELOPMENT OF STANDARDSFOR INSTALLATION OF DOMESTIC GASCONVERSION BURNERS(This History
12、 is informative and is not part of the standard.)At a meeting of the American Gas Association (A.G.A.) ApprovalRequirements Committee in July, 1929, it was decided to form asubcommittee to prepare a standard for the installation ofconversion burners. The subcommittee, organized soon thereafter,devel
13、oped an installation code to guide gas company fitters, heatingand piping contractors, and conversion burner manufacturers in thesafe and efficient use of gas conversion burners in house and waterheating appliances originally designed for utilization of other typesof fuels.On September 11, 1930, the
14、 A.G.A. Approval RequirementsCommittee became Sectional Committee Z21 of the AmericanStandards Association. Consequently, the Subcommittee onRequirements for Installation of Conversion Burners became asubcommittee of the Z21 Committee.A draft of this installation standard for conversion burners wast
15、entatively accepted by the Z21 Committee for release to theindustry in February, 1931 and subsequently printed and distributedon April 28 of the same year. After the usual review and commentperiod had elapsed, the tentative standard was revised by thesubcommittee in the light of comments received an
16、d a modified textwas approved by the Z21 Committee on September 11, 1931.This proposed standard was forwarded to the AmericanStandards Association for acceptance as an American Standard, butbecause of differences between it and the National Fire ProtectionAssociations (NFPA) Recommended Good Practic
17、e Requirements forthe Installation, Maintenance and Use of Piping and Fittings forCity Gas, the conversion burner installation text was referred backfor further consideration. The subcommittee met on March 4, 1932and proposed minor changes to conform with the NFPA code,wherever possible, and the rev
18、ised text was subsequently approvedby the Z21 Committee. A further revision proposed by thesubcommittee was approved by the Z21 Committee at its May 20,1932 meeting. The resultant standard was approved as an AmericanStandard by the American Standards Association in January 4, 1933.Subsequent edition
19、s of the conversion burner installationstandard were approved by the American Standards Association oniFebruary 23, 1940, September 21, 1948, August 12, 1958 andNovember 3, 1965.On August 24, 1966, the American Standards Association wasreconstituted as the United States of America Standards Institut
20、ewhich, in turn, was renamed the American National StandardsInstitute, Inc., on October 6, 1969. As a result, the sixth edition ofthe standard was approved as an American National Standard onDecember 17, 1971. The sixth edition of the standard was reaffirmedby the American National Standards Institu
21、te on January 20, 1977.At its July 10, 1980 meeting, the conversion burnersubcommittee had agreed that a thorough review of Z21.8 was inorder and that a redraft of Z21.8 should be prepared by a workinggroup for consideration by the subcommittee. The draft standard,which was reorganized and updated t
22、o be consistent with theNational Fuel Gas Code, ANSI Z223.1, was distributed for reviewand comment during January 1982. The subcommittee reconsideredthe proposed standard at its May 11-13, 1982 meeting in light ofcomments received and, with some modifications, recommended itto the Z21 Committee, whi
23、ch approved it at its April 7, 1983meeting. The seventh edition of the conversion burner installationstandard was approved as an American National Standard by theAmerican National Standards Institute, Inc., on March 2, 1984.This, the eighth edition of the conversion burner installationstandard was a
24、pproved as an American National Standard by theAmerican National Standards Institute, Inc., on February 14, 1994.Previous editions of the conversion burner installation standard,and addenda thereto, approved by ANSI or its predecessororganizations are as follows:Z21.8-1929Z21.8-1933Z21.8-1940Z21.8-1
25、948Z21.8-1957Z21.8-1958Z21.8-1965 Z21-8a-1967 Z21.8b-1969Z21.8-1971 Z21.8a-1979Z21.8-1984 Z21-8a-1990 Z21.8b-1993NOTE: This 1994 edition of Z21.8 incorporates changes to the1984 edition of Z21.8, and addenda thereto. Changes,other than editorial, are denoted by a vertical line in themargin.iiACCREDI
26、TED STANDARDS COMMITTEE Z21HOWARD I. FORMAN, ChairmanTHEODORE C. LEMOFF, Vice ChairmanALLEN J. CALLAHAN, Administrative Secretary (Non-Voting)REPRESENTING AIR-CONDITIONING CONTRACTORSOF AMERICA:(Liaison Rep.)James P. NorrisREPRESENTING AMERICAN GAS ASSOCIATION:Charles D. ApplequistMichael E. Griffin
27、Dan HansenJohn R. PeakJack D. ReaBilly R. WareREPRESENTING AMERICAN HOME ECONOMICS ASSOCIATION:Frances Gailey, Ph.D.REPRESENTING AMERICAN PUBLIC GAS ASSOCIATION:Robert S. CaveREPRESENTING ASSOCIATION OF HOME APPLIANCEMANUFACTURERS:Earl T. RhinehartiiiAccredited Standards Committee Z21 MembershipREPR
28、ESENTING THE CANADIAN GAS ASSOCIATION:Kenneth BalesKevin Campbell (Alternate)REPRESENTING CONSUMERS UNION:George PapritzREPRESENTING FACTORY MUTUAL SYSTEM:Armand V. BrandaoREPRESENTING GAS APPLIANCE MANUFACTURERSASSOCIATION, INC.:Daniel J. CancliniAlbert B. ChamberlainWilliam E. DaltonJim GoinsMicha
29、el F. GrossoJ. R. KatchkaJames MullenErnest WenczlREPRESENTING GENERAL SERVICES ADMINISTRATION,FEDERAL SUPPLY SERVICE:Dennis DavisChristopher Pollock (Alternate)INDIVIDUAL MEMBERS:Howard I. FormanR. Michael Martin (Liaison Rep.)Vail P. GarvinivAccredited Standards Committee Z21 MembershipREPRESENTIN
30、G INTERNATIONAL ASSOCIATION OF PLUMBINGAND MECHANICAL OFFICIALS:Jack AllenREPRESENTING MECHANICAL CONTRACTORS ASSOCIATION OFAMERICA, INC.:William C. AbernathyREPRESENTING NATIONAL ASSOCIATION OF PLUMBING-HEATING AND COOLING CONTRACTORS:Terrell D. MoseleyRobert Warren (Alternate)REPRESENTING NATIONAL
31、 ELECTRICAL MANUFACTURERSASSOCIATION:G. E. WillertAlan R. Anderson (Alternate)REPRESENTING NATIONAL FIRE PROTECTION ASSOCIATION:Theodore C. LemoffREPRESENTING NATIONAL PROPANE GAS ASSOCIATION:Ty V. LotzREPRESENTING NATIONAL INSTITUTE OF STANDARDS ANDTECHNOLOGY, U.S. DEPARTMENT OF COMMERCE:Walter G.
32、LeightvAccredited Standards Committee Z21 MembershipREPRESENTING NAVAL FACILITIES ENGINEERING COMMAND,U.S. DEPARTMENT OF THE NAVY:Danny C. MuiW. E. Watkins (Alternate)U.S. DEPARTMENT OF DEFENSE - OFFICE OF ASSISTANTSECRETARY OF DEFENSE:Greg ScundenREPRESENTING SOUTHERN BUILDING CODE CONGRESS:(Appoin
33、tment Pending)REPRESENTING UNDERWRITERS LABORATORIES INC.:Henry JonesREPRESENTING U.S. CONSUMER PRODUCT SAFETYCOMMISSION:(Liaison Rep.)Donald W. SwitzerREPRESENTING U.S. DEPT. OF ENERGY:(Liaison Rep.)Ernie FreemanREPRESENTING U.S. DEPT. OF HEALTH AND HUMAN SERVICES:(Appointment Pending)REPRESENTING
34、U.S. DEPT. OF HOUSING AND URBANDEVELOPMENT:(Liaison Rep.)Victor J. FerranteviSUBCOMMITTEE ON STANDARDS FORDOMESTIC GAS CONVERSION BURNERSTERRANCE C. SLABY, ChairmanREPRESENTING GAS COMPANIES:Daniel F. ColeErnest W. KocherRobert L. ReifREPRESENTING MANUFACTURERS:Richard A. CunhaGordon DauleyCarl H. K
35、olbR. A. MackintoshMelvin J. MyersTerrance C. SlabyviiCONTENTSPagePART 1.MSCOPE1.1 Applicability . 11.2 Safe and Satisfactory Operation 11.3 Installation 2PART 2.MVISUAL INSPECTION2.1 Air for Combustion and Ventilation 32.2 Combustion Chamber Liner . 82.3 Vent Connector . 82.4 Chimney 82.5 Accessori
36、es 82.6 Vent Damper Devices 82.7 Electrical Supply Considerations 82.8 Plate . 8PART 3.MSELECTION AND SIZING OF CONVERSION BURNER3.1 General . 93.2 Typical Conversion Burner Types . 93.3 Appliance Design Features 103.4 Heat Loss Determination 103.5 Input Rate Determination . 103.6 Preliminary Burner
37、 Selection 113.7 Final Burner Selection . 19PART 4.MPREPARATION OF EXISTING HEATING PLANT4.1 Cleaning 214.2 Reconditioning . 214.3 Combustion Chamber Linings 214.4 Water Heating Coils . 224.5 Use of Asbestos . 22PART 5.MPREPARATION OF EXISTING HEATING SYSTEM5.1 Chimneys . 235.2 Vent Connector and Ch
38、imney Sizing . 235.3 Pitch . 245.4 Revertible Flues 255.5 Support and Clearance . 255.6 Draft Hoods and Barometric Draft Regulators . . 255.7 Vent Connection 28viiiCONTENTS (Continued)PagePART 6.MGAS PIPING6.1 General . 306.2 Installation of Piping . 306.3 Inspection and Testing of Piping 30PART 7.M
39、INSTALLATION OF BURNER7.1 Field Installation of Electrical Wiring 327.2 System Safety and Limiting Devices . 337.3 Inspection of Burner and Controls 347.4 Placement of Burner . 35PART 8.MSTART-UP AND ADJUSTMENT8.1 General . 368.2 Recommended Instruments 368.3 Leak Test (Low Pressure) . 368.4 Input A
40、djustment and Orifice Pressure . 378.5 Adjustment of Draft . 378.6 Preliminary Adjustment of Combustion Air 398.7 Final Adjustment 398.8 Final Checking . 41PART 9.MCOMPLETING THE INSTALLATION9.1 Oil Storage System 439.2 Solid Fuel System . 439.3 Cleaning 439.4 Instructions to Customers . 459.5 Place
41、ment of Manufacturers Instructions . 449.6 Installation Adjustment Data . 449.7 Gas Supplier Notification . 44EXHIBITMLIST OF REFERENCED STANDARDS . 45PART 10.MDEFINITIONS 46ixAMERICAN NATIONAL STANDARD FORINSTALLATION OF DOMESTICGAS CONVERSION BURNERSPART 1SCOPE1.1MApplicability.This standard appli
42、es to the installation of a conversion burner withan input of 400,000 Btu per hour (117 228 W) or less and design certifiedas complying with the Standard for Domestic Gas Conversion Burners,ANSI Z21.17.This standard, in conjunction with local codes or, in the absence of localcodes, with the National
43、 Fuel Gas Code, ANSI Z223.1, is applicable tosituations where an appliance is to be converted to gas with a conversionburner, provided it can be demonstrated under Parts 2 and 3 that such aconversion can be made with safety, economy and in the best interest of theconsumer.All references to “psi” thr
44、oughout this standard are to be consideredgage pressure, unless otherwise specified.Exhibit contains a list of standards specifically referenced in thisstandard, and sources from which these reference standards may beobtained.1.2MSafe and Satisfactory Operation.Once the decision has been made to con
45、vert an appliance from anotherfuel to gas, safe and satisfactory operation will be dependent on a numberof factors. Among these are:a.MProper analysis of the feasibility of conversion;b.MProper selection of the burner to be used;1c.MProper selection of the draft hood or barometric draft regulator to
46、be used;d.MFollowing the instructions contained in this standard; ande.MFollowing the installation instructions provided with the conversionburner.For further information or assistance, the appliance manufacturershould be contacted. In no case should the appliance be modified beyondthe recommendatio
47、n of the appliance manufacturer. If the manufacturercannot be contacted, the local gas supplier should be consulted.1.3MInstallation.The responsibility for a safe and satisfactory installation is shared bythe agency determining the feasibility and selection of the burner, theinstaller, and the local
48、 authority having jurisdiction. In many areas apermit is required. Obtaining this permit is the responsibility of theinstaller. Maintenance and reporting of possible improper operation is theresponsibility of the user. It is the responsibility of the installer to informthe user of the correct operat
49、ion and maintenance.2PART 2VISUAL INSPECTIONBefore proceeding with the removal of parts from the existingappliance, a careful inspection shall be made as to the condition of theappliance. This inspection shall be made for cracks or loose cement inheating sections, warped doors and door frames, leaking plugs, and anyother condition which would make the converted appliance uneconomical orunsafe. Thorough examination of heat exchangers shall show no evidenceof cracks or excessive corrosion. Boilers shall show no signs of waterleakage, evidence of cracked sections, or excessive corrosion.The
