DIRECT GAS-FIRED CIRCULATING HEATERS FOR AGRICULTURAL ANIMAL CONFINEMENT BUILDINGS

Fi rst Editio n - 1996

Pri nted in U.S.A.

by

Interna tio na l App rova l Se rvices - U.S., Inc ., 8501 East Pleasan t Vall ey Road

Cl eve land , Ohio 44131

App roved March 8, 1996

AMERICAN NATIO NAL

STAND ARDS INS TIT UTE, INC.

Copy ri ght © 1996 , Interna tio na l App rova l Se rvices - U.S., Inc .

Pe r m issio n is g r anted to r epu blis h ma t e ri a l he r e i n i n l a w s o r o r dinances , and i n r egu lations , administ r ative o r de r s , o r simi l a r documents iss ued by pub li c autho riti es . Those desi ri ng pe rmissio n for othe r repu bli cation shou ld consu lt Interna tio na l App rova l Se rvices - U.S., Inc ., 8501 East Pleasan t Vall ey Road , Cl eve land , Ohio 44131 .

PREFACE

This pub li cation represen ts a basi c standa rd for safe ope ration , substantia l and du r ab l e const r uc tio n , and acceptab l e pe rf o r mance o f di r ec t gas - fired circu lating hea ters for ag ri cu lt ural anima l con finemen t buildi ngs . It is the resu lt of yea r s o f expe ri ence i n t he manu f actu r e , t es ti ng , i ns tallatio n, ma i n t enance , inspec tio n and resea rch on di rec t gas -fired ci rcu lating hea ters for ag ri cu lt ural anima l con finemen t buildi ngs designed for the utilizatio n of gas . The re are ri sks of injury to pe rsons inhe ren t in some app li ances that, if comp letely eli minated, wou ld de fea t the utility of the app liance . The provisions in this Standa rd are intended to reduce such ri sks while retai ning the normal func tio n of the app li ance .

Nothing in this standa rd is to be conside red in any w ay as ind icati ng a measu r e of q ua lit y b eyond comp li ance w it h t he p r ovisions it contains . It is designed to all ow comp li ance of direct gas -fir ed circu lating hea ters for ag ri cu lt ural anima l con finemen t buildi ngs , the const ruc tio n and pe rformance of w hic h may exceed the various provisions speci fied he rein. In its prepa ration , full recogn itio n has been given to possibi liti es of imp rovement through ingenu ity of design . As prog ress tak es place , rev isio ns may become necessa ry. When they are beli eved desi r ab l e , r ecommenda tio ns shou ld b e fo r w a r ded to In t e r na tio na l App r ova l Se rvices - U. S., Inc ., 8501 East P leasan t Vall ey Road , Cl eve land , Oh io 44131 . A proposa l form is provided in the back of this document .

Safe and satis facto ry ope ration of direc t gas -fired circu lating hea ters for ag ri cu lt ural anima l con finemen t b u ildi ngs depends to a grea t ex t en t upon its prope r installatio n, and it shou ld be install ed in acco rdance with the National Fuel G a s Co d e, A NS I Z223 . 1 , manu f actu r e r s’ i ns tallatio n i ns tr uc tio ns , and l oca l mun icipal buildi ng codes .

Use r s o f t h is A me ri can Nationa l Standa r d a r e advised t ha t t he devices /products /activities w it hin its scope may be sub jec t to regu lation at the Fede ral state or loca l leve l. Use rs are strong ly urged to inves tigat e this possibi lit y through app rop ri ate channe ls. In the even t of a con flict wit h this standa rd, the Fede ral, state or loca l regu lation shou ld be follo wed.

CA U TIO N N OTIC E: T h is A me ri can Nationa l Standa r d may b e r ev is ed o r w it hd ra w n at any ti me . The procedu r es of t he Ame ri can Nationa l Standa rds Ins tit ute, Inc ., requir e tha t action be tak en to rea ffir m, rev is e or w it hd ra w this standa rd no late r than five (5) yea rs fr om the date of app rova l. Pu rchase rs of Ame ri can Nationa l Standa rds may rece iv e cu rr en t informatio n on all standa rds by ca lli ng or writi ng the Ame ri can Nationa l Standa rds Ins tit ute, Inc., 11 Wes t 42 nd Stree t, Ne w York, N.Y. 10036 , (212) 642-4900 .

EFFE CTIV E DATE: An organization using this standa rd for product eva luatio n as a pa rt of its ce rti fication prog ram w ill no rma ll y es tablis h the date by w hic h all products ce rtifi ed by that organization shou ld comp ly with this standa rd.

HISTORY OF THE DEVELOPMEN T OF STANDARD FOR DIRECT GAS-FIRED CIRCULATING HEATERS FOR AGRICULTURAL ANIMAL CONF INEMENT BU ILDINGS

(This History is informat ive and is not part of the stan dard.)

In 1988 , Interna tio nal Approva l Se rvices -U.S. Inc . (f o r me rl y t he Ame ri can Gas Association labo rato ri es), deve loped its A.G.A. Requiremen t 5-88 on ag ri cu lt ural hea ters. This standa rd was used for design ce rti fication tes ti ng of gas -fired ag ri cu lt ural hea t ers by IAS U. S. In t eres t w as i nd icat ed i n 1990 to deve l op a na tio na ll y r ecogn iz ed standa r d, at w h ic h ti me IAS U. S. ag r eed to r e li n q u is h its standa r d to t he Z83 P r o j ec t . T he Z 83 C ommittee assigned t he activity to its const ructio n hea ter subcommittee .

As ti me p r og r essed , t he r e w as a desi r e to exped it e deve lopment of a na tio na l standa rd and it w as b e li eved t ha t t h is cou l d b e accomp li shed mo r e r ead ily by r e t u r n i ng t he d r a f t standa r d to IA S U . S . f o r deve l opment unde r its ANS I Canvass Me t hod sponso rship . The Z83 Committee and its const ruc tio n hea ter subcommittee ag reed tha t IAS U.S. unde rt ake deve lopment of the standa rd.

IA S U . S . p r oceeded to es tablis h a ne w p r o j ec t activity . T he A me ri can Nationa l Standa r ds Ins tit u t e (ANS I) w as contacted i n Octo ber 1994 to inform them tha t IAS U.S. w as unde rt aking t h is p r oj ec t unde r its C anvass Method sponso rship . A Canvass List was formed o f i n t e r es t ed pa rti es to exe r cise r ev i e w and app rova l of the standa rd. The A.G.A. (IAS U.S.) Requiremen ts Committee , an internal standa rds writi ng committee of IAS U.S., and a Techn ical Adviso r y Gr oup (TAG) comp ri sed of non -IAS interes ted pa rti es , w ere appointed to se rve as t he t echn ical adviso r s on t h is activity . T he projec t w as assigned the designation IAS U.S. LC 2.

IAS U.S. LC 2 provides cove rage for ne wly- p r oduced di r ec t - fi r ed ci r cu l ating hea t e r s p ri ma ril y i n t ended f o r use i n ag ri cu lt u r a l anima l con finemen t buildi ngs .

At its Decembe r 1, 1994 mee ting, the IAS U.S. Requiremen ts Committee reviewed and mod ified p r o p o s e d IA S U . S . LC 2 , i n li g h t o f recommenda tio ns deve loped previo usly by an ad hoc w o r king g r oup o f t he Z 83 const r uc tio n hea ter subcommittee .

By l e tt e r ballot dated Decembe r 22 , 1994 , ind ivid ua ls se lec ted to se rve on the Techn ical

Adviso ry Gr oup (TAG) w ere forw arded a copy o f p r oposed IA S U . S . LC 2 standa r d dated Decembe r 1994 . They w ere asked to rev ie w the document for techn ical accu racy. The resu lt s of t he ballot i nd icat ed t he document r e q u ir ed furt her review and deve lopment .

At its Feb ruary 2, 1995 mee ti ng, the IAS U.S. R e q u ir emen ts C ommittee mod i fi ed t he Decembe r 1994 draft of proposed IAS U.S. LC 2, in li ght of substantive comments rece iv ed from t he T echn ical A dviso r y Gr oup (T AG). Subsequent ly, a second draft of proposed IAS U.S. LC 2 dated Feb rua ry 1995 w as forw arded to t he TAG f o r t he ir r ev i e w. C omment w as rece iv ed tha t the standa rd shou ld be li mit ed to hea ters hav ing a nom ina l gas supp ly pressu re not exceed ing 1/2 psig . This comment was bas ed on a r ecommenda tio n made by t he GAMA Cont rols Division Standa rds Review Task Gr oup at its Feb ruary 1994 mee ting.

After TAG app rova l and mod ification in li ght of the above comment , a third draft of IAS U.S. LC 2 , dated M a r ch 1995 , w as p r epa r ed and dist rib uted to the canvass li st by letter ballot .

A June 15 , 1995 mee ti ng o f t he IA S Requiremen ts Committee was he ld in response to reques ts submitted by two parti cipants . Both i nd ivid ua l s o ri gina ll y voted “Objec t” on t he Canvass ballot dated Feb ruary 28, 1995 . In order to r eso l ve t he ob j ec tio ns , bot h i nd ivid ua l s agreed to change the ir vote to “Abstai n” on the Feb ruary 1995 ballot , provided a mee ti ng of the IAS Requiremen ts Committee was schedu led to add ress the ir comments pri or to a pub li c review submitta l to the Ame ri can Nationa l Standa rds Instit ute (ANS I).

A subsequent fou rt h draft of proposed IAS U. S. LC 2 dated June 1995 w as dist rib u t ed to t he TAG by ball ot . The TAG w as re q ues t ed to vote on w he t he r t he June 1995 d r a f t o f p r oposed IA S U . S . LC 2 w as r eady f o r dist rib utio n to the canvass li st.

I n vie w o f t he f avo r ab l e vote by t he TAG mem bers, the June 1995 Draft of proposed IAS U.S. LC 2 w as dist rib uted to and app roved by t he canvass li st by l e tt e r ballot and w as app roved by the Ame ri can Nationa l Standa rds Instit ute (ANS I) on March 8, 1996 .

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CONTEN TS

Page

PART I. CONS TRU CTIO N

1. Scope 1

2. Gene ral Const ructio n 2

3. Mate ri als 3

4. Assemb ly 3

5. Accessi bility 4

6. Main burners 4

7. Combustion Air Cont rol 5

8. Orifices and Orifice Fittings 5

9. Ignition Means (Systems ) 5

10. Combination Gas Cont rols 7

11. Manua l Gas Valves 7

12. Heater Gas Pipi ng 8

13. Gas Hos e Assemb li es 9

14. Auto matic Valves and Safety Shuto ff Valves 10

15. Gas Pressu re Regu lato rs 11

16. Thermos tats 12

17. Adjustmen t of Minimum Inpu t Rati ng 12

18. Limit Cont rols 12

19. Electrical Equip men t and Wiri ng 13

20. Moto rs 19

21. Instructio ns 19

22. Marking 24

PART II. PERF ORMANCE

1. Gene ral 30

2. Test Gases 30

3. Test Pressu res and Burner Adjustmen ts 31

4. Combustion 31

5. Burner and Pilot Operating Characte ri stics 31

6. Manua l and Pilot ed Ignition Systems 32

7. Direct Ignition Systems 37

8. Limit Cont rols 38

9. Mani fold and Cont rol Assemb ly Capacity 39

10. Wall, Floor, Ceili ng and Electrical Equip men t and Wiri ng Tempe ratu res 40

11. Rai n Test for Heaters for Outdoor Installatio n 42

12. Wind Test 42

13. Washdo wn Test 43

14. Season Cracking 44

15. Marking Mate ri al Adhesion and Legibility 44

TABLES IN PARTS I AND II

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Contents (Continued )

Page Table III. Minimum Accepta ble Wall Thick ness for Non ferrous Tubing 48

Table IV. Maximum Tubing and Fitting Tempe ratu res 49

Table V. Minimum Leng th to Shou lder 49

Table VI. Jun ction Box Free Space Per Conducto r 49

Table VII. Minimum Average Thick ness of Sheet -Metal Jun ction Boxes * 50

Table VIII. Electrical Cl earances , Inches (mm) 51

Table IX. Insu lation Thick ness of Facto ry Wiri ng Expos ed in Burner or Fan Compa rt men t . . . 52 Table X. M aximum A ll o w ab l e Ris e A bov e Roo m Tempe r atu r e f o r Va ri ous

Component Part s 53

Table XI. Maximum Allo wable Moto r Winding Tempe ratu res, °F (°C) 54

Table XII. Characte ri stics of Test Gases 54

Table XIII. Operating Test Conditions 54

FIGURES IN PARTS I AND II

Figu re 1. Arrangement of Spray Heads and Associated Pipi ng for Simu lated Rai nstor m Test 56

Figu re 2. Spray Head Assemb ly and Detai ls of Const ructio n 56

EXHIBIT A. LIST OF REFEREN CE STANDARDS 57

PART III. MANUFACT URING AND PRODU CTIO N TESTS 60

PART IV. DEF INITIO NS 62

APP END IX A. PERTINEN T REFEREN CES TO ANSI Y14.15 70

APP END IX B. WIRE COLO R DES IGNATIO NS 71

APP END IX C. RECOMMENDED WIRE COLO R USAGE 72

APP END IX D. P REFERRED G RA P H IC SYM B OL S O F COMMO N LY USED IT EM S , EXTRACT ED FROM STAND ARD ANS I/IEEE 315 , GRAPHIC SYMBOLS F O R E L E CT R ICAL A ND E L E CT R O N IC S D IAG R AM S , A ND

ABBRE VIATIO NS FOR THESE ITEMS 73

APP END IX E. TABLE OF CONVERS ION FACTO RS 75

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AMERICAN NATIONAL STANDARD FOR DIRECT GAS-FIRED CIRCULATING HEATERS FOR

AGRICULTURAL ANIMAL CONFINEMENT BUILDINGS

• PART I

CONSTRUCTION

1. SCOPE

   1. This standard applies to newly-produced direct gas-fired circulating heaters (see Part IV, Definitions) of 400,000 Btu (117 228 W) or less, hereinafter referred to as heaters, constructed entirely of new, unused parts and materials and primarily intended for permanent installation in agricultural animal confinement buildings. All the products of combustion generated by the heater are released into the area being heated.

      2

      These requirements apply to heaters having a gas supply pressure rating not exceeding 1/ psi

      (3.45 kPa) at the gas inlet of the appliance.

      
      

   2. This standard does not apply to heaters intended for use in green houses.

      
      

   3. This standard applies to self-contained heaters with integral means for air circulation.

      
      

   4. This standard does not cover heaters employing a flameless catalytic combustion process, heaters for use with liquid phase fuel gases or infrared type heaters.

      
      

   5. This standard applies to heaters having an air outlet temperature of 350°F (176.5°C) above room temperature or less (see 2.8.2).

      
      

   6. Special construction provisions applicable to a heater for outdoor installation are outlined under 1.2.5, 1.3.5, 1.3.6, 1.5, 1.7.3, 1.9.3-2b and 1.22.4.

      
      

   7. Heaters covered by this standard are intended for use with natural or liquefied petroleum gases. The construction of heaters for use with the above-mentioned gases is covered under Part I. The performance of heaters for use with the above-mentioned gases is covered under Part II.

   8. Special construction provisions for heaters intended for installations subject to spray washdown are outlined under 1.2.7 and 1.21.1.

      
      

   9. Exhibit A contains a list of standards specifically referenced in this standard, and sources from which these reference standards may be obtained.

1