1、DIRECT GAS-FIREDCIRCULATING HEATERS FORAGRICULTURAL ANIMALCONFINEMENT BUILDINGSANSI/IAS U.S.LC 2-1996INTERNATIONALAPPROVAL SERVICES - U.S., INC.8501 East Pleasant Valley Rd.,Cleveland, Ohio 44131First Edition - 1996Printed in U.S.A.byInternational Approval Services - U.S., Inc.,8501 East Pleasant Va
2、lley RoadCleveland, Ohio 44131ApprovedMarch 8, 1996AMERICAN NATIONALSTANDARDS INSTITUTE, INC.Copyright 1996, International Approval Services - U.S., Inc.Permission is granted to republish material herein in laws orordinances, and in regulations, administrative orders, or similar documentsissued by p
3、ublic authorities. Those desiring permission for other republicationshould consult International Approval Services - U.S., Inc., 8501 East PleasantValley Road, Cleveland, Ohio 44131.PREFACEThis publication represents a basic standard for safe operation, substantialand durable construction, and accep
4、table performance of direct gas-firedcirculating heaters for agricultural animal confinement buildings. It is the result ofyears of experience in the manufacture, testing, installation, maintenance,inspection and research on direct gas-fired circulating heaters for agriculturalanimal confinement bui
5、ldings designed for the utilization of gas. There are risks ofinjury to persons inherent in some appliances that, if completely eliminated, woulddefeat the utility of the appliance. The provisions in this Standard are intended toreduce such risks while retaining the normal function of the appliance.
6、Nothing in this standard is to be considered in any way as indicating ameasure of quality beyond compliance with the provisions it contains. It isdesigned to allow compliance of direct gas-fired circulating heaters for agriculturalanimal confinement buildings, the construction and performance of whi
7、ch mayexceed the various provisions specified herein. In its preparation, full recognitionhas been given to possibilities of improvement through ingenuity of design. Asprogress takes place, revisions may become necessary. When they are believeddesirable, recommendations should be forwarded to Intern
8、ational ApprovalServices - U.S., Inc., 8501 East Pleasant Valley Road, Cleveland, Ohio 44131. Aproposal form is provided in the back of this document.Safe and satisfactory operation of direct gas-fired circulating heaters foragricultural animal confinement buildings depends to a great extent upon it
9、sproper installation, and it should be installed in accordance with the National FuelGas Code, ANSI Z223.1, manufacturers installation instructions, and localmunicipal building codes.Users of this American National Standard are advised that thedevices/products/activities within its scope may be subj
10、ect to regulation at theFederal state or local level. Users are strongly urged to investigate this possibilitythrough appropriate channels. In the event of a conflict with this standard, theFederal, state or local regulation should be followed.CAUTION NOTICE:MThis American National Standard may be r
11、evised orwithdrawn at any time. The procedures of the American National StandardsInstitute, Inc., require that action be taken to reaffirm, revise or withdraw thisstandard no later than five (5) years from the date of approval. Purchasers ofAmerican National Standards may receive current information
12、 on all standards bycalling or writing the American National Standards Institute, Inc., 11 West 42ndStreet, New York, N.Y. 10036, (212) 642-4900.EFFECTIVE DATE:MAn organization using this standard for product evaluation asa part of its certification program will normally establish the date by which
13、allproducts certified by that organization should comply with this standard.HISTORY OF THE DEVELOPMENT OF STANDARDFOR DIRECT GAS-FIRED CIRCULATING HEATERS FORAGRICULTURAL ANIMAL CONFINEMENT BUILDINGS(This History is informative and is not part of the standard.)In 1988, International Approval Service
14、s-U.S.Inc. (formerly the American Gas Associationlaboratories), developed its A.G.A. Requirement5-88 on agricultural heaters. This standard wasused for design certification testing of gas-firedagricultural heaters by IAS U.S. Interest wasindicated in 1990 to develop a nationallyrecognized standard,
15、at which time IAS U.S.agreed to relinquish its standard to the Z83Project. The Z83 Committee assigned theactivity to its construction heater subcommittee.As time progressed, there was a desire toexpedite development of a national standardand it was believed that this could beaccomplished more readil
16、y by returning thedraft standard to IAS U.S. for developmentunder its ANSI Canvass Method sponsorship.The Z83 Committee and its construction heatersubcommittee agreed that IAS U.S. undertakedevelopment of the standard.IAS U.S. proceeded to establish a newproject activity. The American NationalStanda
17、rds Institute (ANSI) was contacted inOctober 1994 to inform them that IAS U.S. wasundertaking this project under its CanvassMethod sponsorship. A Canvass List was formedof interested parties to exercise review andapproval of the standard. The A.G.A. (IAS U.S.)Requirements Committee, an internal stan
18、dardswriting committee of IAS U.S., and a TechnicalAdvisory Group (TAG) comprised of non-IASinterested parties, were appointed to serve asthe technical advisors on this activity. Theproject was assigned the designation IAS U.S.LC 2.IAS U.S. LC 2 provides coverage for newly-produced direct-fired circ
19、ulating heatersprimarily intended for use in agriculturalanimal confinement buildings.At its December 1, 1994 meeting, the IAS U.S.Requirements Committee reviewed and modifiedproposed IAS U.S. LC 2, in light ofrecommendations developed previously by an adhoc working group of the Z83 constructionheat
20、er subcommittee.By letter ballot dated December 22, 1994,individuals selected to serve on the TechnicalAdvisory Group (TAG) were forwarded a copyof proposed IAS U.S. LC 2 standard datedDecember 1994. They were asked to review thedocument for technical accuracy. The results ofthe ballot indicated the
21、 document requiredfurther review and development.At its February 2, 1995 meeting, the IAS U.S.Requirements Committee modified theDecember 1994 draft of proposed IAS U.S. LC 2,in light of substantive comments received fromthe Technical Advisory Group (TAG).Subsequently, a second draft of proposed IAS
22、U.S. LC 2 dated February 1995 was forwardedto the TAG for their review. Comment wasreceived that the standard should be limited toheaters having a nominal gas supply pressurenot exceeding 1/2 psig. This comment was basedon a recommendation made by the GAMAControls Division Standards Review Task Grou
23、pat its February 1994 meeting.After TAG approval and modification in lightof the above comment, a third draft of IAS U.S.LC 2, dated March 1995, was prepared anddistributed to the canvass list by letter ballot.A June 15, 1995 meeting of the IASRequirements Committee was held in responseto requests s
24、ubmitted by two participants. Bothindividuals originally voted “Object” on theCanvass ballot dated February 28, 1995. In orderto resolve the objections, both individualsagreed to change their vote to “Abstain” on theFebruary 1995 ballot, provided a meeting of theIAS Requirements Committee was schedu
25、led toaddress their comments prior to a public reviewsubmittal to the American National StandardsInstitute (ANSI).A subsequent fourth draft of proposed IASU.S. LC 2 dated June 1995 was distributed tothe TAG by ballot. The TAG was requested tovote on whether the June 1995 draft ofproposed IAS U.S. LC
26、 2 was ready fordistribution to the canvass list.In view of the favorable vote by the TAGmembers, the June 1995 Draft of proposed IASU.S. LC 2 was distributed to and approved bythe canvass list by letter ballot and wasapproved by the American National StandardsInstitute (ANSI) on March 8, 1996.iiCON
27、TENTSPagePART I. CONSTRUCTION1.1 Scope 11.2 General Construction 21.3 Materials . 31.4 Assembly . 31.5 Accessibility . 41.6 Main burners 41.7 Combustion Air Control 51.8 Orifices and Orifice Fittings . 51.9 Ignition Means (Systems) . 51.10 Combination Gas Controls 71.11 Manual Gas Valves 71.12 Heate
28、r Gas Piping 81.13 Gas Hose Assemblies 91.14 Automatic Valves and Safety Shutoff Valves 101.15 Gas Pressure Regulators 111.16 Thermostats 121.17 Adjustment of Minimum Input Rating 121.18 Limit Controls 121.19 Electrical Equipment and Wiring 131.20 Motors 191.21 Instructions 191.22 Marking . 24PART I
29、I. PERFORMANCE2.1 General . 302.2 Test Gases . 302.3 Test Pressures and Burner Adjustments 312.4 Combustion 312.5 Burner and Pilot Operating Characteristics 312.6 Manual and Piloted Ignition Systems . 322.7 Direct Ignition Systems . 372.8 Limit Controls 382.9 Manifold and Control Assembly Capacity 3
30、92.10 Wall, Floor, Ceiling and Electrical Equipment and Wiring Temperatures 402.11 Rain Test for Heaters for Outdoor Installation 422.12 Wind Test 422.13 Washdown Test . 432.14 Season Cracking 442.15 Marking Material Adhesion and Legibility . 44TABLES IN PARTS I AND IITable I. Minimum Corrosion Prot
31、ection of Ferrous Materials Used in theConstruction of Heaters for Outdoor Installation or Subject to SprayWashdown (see 1.3.5) . 47Table II. Maximum Ignition System Timings 48iiiContents (Continued)PageTable III. Minimum Acceptable Wall Thickness for Nonferrous Tubing . 48Table IV. Maximum Tubing a
32、nd Fitting Temperatures . 49Table V. Minimum Length to Shoulder 49Table VI. Junction Box Free Space Per Conductor 49Table VII. Minimum Average Thickness of Sheet-Metal Junction Boxes* 50Table VIII. Electrical Clearances, Inches (mm) 51Table IX. Insulation Thickness of Factory Wiring Exposed in Burne
33、r or Fan Compartment . . . 52Table X. Maximum Allowable Rise Above Room Temperature for VariousComponent Parts 53Table XI. Maximum Allowable Motor Winding Temperatures, F(C) 54Table XII. Characteristics of Test Gases . 54Table XIII. Operating Test Conditions . 54FIGURES IN PARTS I AND IIFigure 1. Ar
34、rangement of Spray Heads and Associated Piping for Simulated Rainstorm Test 56Figure 2. Spray Head Assembly and Details of Construction . 56EXHIBIT A. LIST OF REFERENCE STANDARDS . 57PART III. MANUFACTURING AND PRODUCTION TESTS 60PART IV. DEFINITIONS 62APPENDIX A. PERTINENT REFERENCES TO ANSI Y14.15
35、 . 70APPENDIX B. WIRE COLOR DESIGNATIONS . 71APPENDIX C. RECOMMENDED WIRE COLOR USAGE 72APPENDIX D. PREFERRED GRAPHIC SYMBOLS OF COMMONLY USED ITEMS,EXTRACTED FROM STANDARD ANSI/IEEE 315, GRAPHIC SYMBOLSFOR ELECTRICAL AND ELECTRONICS DIAGRAMS, ANDABBREVIATIONS FOR THESE ITEMS . 73APPENDIX E. TABLE O
36、F CONVERSION FACTORS . 75ivAMERICAN NATIONAL STANDARD FORDIRECT GAS-FIRED CIRCULATING HEATERS FORAGRICULTURAL ANIMAL CONFINEMENT BUILDINGSPART ICONSTRUCTION1.1 SCOPE1.1.1 This standard applies to newly-produced direct gas-fired circulating heaters (see Part IV,Definitions) of 400,000 Btu (117 228 W)
37、 or less, hereinafter referred to as heaters, constructedentirely of new, unused parts and materials and primarily intended for permanent installation inagricultural animal confinement buildings. All the products of combustion generated by theheater are released into the area being heated.These requ
38、irements apply to heaters having a gas supply pressure rating not exceeding1/2psi(3.45 kPa) at the gas inlet of the appliance.1.1.2 This standard does not apply to heaters intended for use in green houses.1.1.3 This standard applies to self-contained heaters with integral means for air circulation.1
39、.1.4 This standard does not cover heaters employing a flameless catalytic combustion process, heatersfor use with liquid phase fuel gases or infrared type heaters.1.1.5 This standard applies to heaters having an air outlet temperature of 350F (176.5C) above roomtemperature or less (see 2.8.2).1.1.6
40、Special construction provisions applicable to a heater for outdoor installation are outlined under1.2.5, 1.3.5, 1.3.6, 1.5, 1.7.3, 1.9.3-2b and 1.22.4.1.1.7 Heaters covered by this standard are intended for use with natural or liquefied petroleum gases.The construction of heaters for use with the ab
41、ove-mentioned gases is covered under Part I.The performance of heaters for use with the above-mentioned gases is covered under Part II.1.1.8 Special construction provisions for heaters intended for installations subject to spray washdownare outlined under 1.2.7 and 1.21.1.1.1.9 Exhibit A contains a
42、list of standards specifically referenced in this standard, and sources fromwhich these reference standards may be obtained.11.1.10 If a value for measurement as given in this standard is followed by an equivalent value in otherunits, the first stated value is to be regarded as the specification.1.1
43、0.11 All references to psi throughout this standard are to be considered gage pressure unless otherwisespecified.1.2 GENERAL CONSTRUCTION1.2.1 The construction of the heater shall be such that it will not show signs of becoming warped,bent, broken or otherwise damaged during the initial test install
44、ation or during any of the testsspecified herein so as to prevent its compliance with any of these provisions and, whetherspecifically covered by the various provisions of this standard or not, shall be in accordance withreasonable concepts of safety, substantiality and durability.All specifications
45、 as to construction set forth herein may be satisfied by the construction actuallyprescribed or such other construction as will provide at least equivalent performance.1.2.2 Asbestos shall not be used in the construction of a heater.1.2.3 Every part of the heater shall be secure against displacement
46、 and shall be constructed so as tomaintain a fixed relationship between essential parts under normal and reasonable conditions ofhandling and usage.Parts not permanently secured shall be designed so they cannot be incorrectly assembled andcannot be improperly located or misaligned when removed or re
47、placed during cleaning or otherservicing.1.2.4 All components shall be suitable for the temperatures to which they are exposed. In thoseinstances where component temperature suitability is not determined under the other provisionsof this standard or by established compliance with a nationally recogn
48、ized standard pertaining tothe specific component, the testing agency at its discretion may rely upon the recommendations ofthe component manufacturer as submitted by the heater manufacturer.1.2.5 A heater for outdoor installation shall have all controls and electrical wiring enclosed andprotected f
49、rom environmental climate conditions.1.2.6 A heater shall be constructed so it cannot be tipped over when subjected to the followingMethod of Test. This provision shall not apply to heaters which are provided with means(including necessary screws, bolts, or both) and instructions for attaching them to the wall, flooror ceiling.Method of TestAppliances weighing up to 100 pounds (45.4 kg) shall be tipped in any direction at an angle of15 degrees (0.26 rad) from the vertical and shall not tip over when released.2Appliances weighing over 100 pounds (45.4 kg), shall not tip over when a horiz
