23_52_00_HEATING_BOILERS.pdf

WEST POI NT ELEMENTARY SCHOOL REPLACEMENT W91236-15-D-0014

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HEATI NG BOI LERS

04/08

PART 1 GENERAL

1. 1 REFERENCES

The publ i cat i ons l i s t ed bel ow f or m a par t of t hi s speci f i cat i on t o t he ext ent r ef er enced. The publ i cat i ons ar e r ef er r ed t o wi t hi n t he t ext by t he basi c desi gnat i on onl y.

AI R- CONDI TI ONI NG, HEATI NG AND REFRI GERATI ON I NSTI TUTE ( AHRI )

AHRI 440 ( 2008) Room Fan- Coi l s and Uni t Vent i l at or s

AMERI CAN NATI ONAL STANDARDS I NSTI TUTE ( ANSI )

ANSI Z21. 13/ CSA 4. 9 ( 2014; Er r at a 2014) Gas- Fi r ed Low Pr essur e St eam and Hot Wat er Boi l er s

AMERI CAN SOCI ETY OF HEATI NG, REFRI GERATI NG AND AI R- CONDI TI ONI NG

ENGI NEERS ( ASHRAE)

ASHRAE 52. 1 ( 1992; I nt er pr et at i on 1 2007) Gr avi met r i c and Dust - Spot Pr ocedur es f or Test i ng Ai r - Cl eani ng Devi ces Used i n Gener al Vent i l at i on f or Removi ng Par t i cul at e Mat t er

ASHRAE 52. 2 ( 2012; Er r at a 2013; I NT 1 2014) Met hod of Test i ng Gener al Vent i l at i on Ai r - Cl eani ng Devi ces f or Removal Ef f i c i ency by Par t i c l e Size

AMERI CAN WELDI NG SOCI ETY ( AWS)

AWS B2. 2/ B2. 2M ( 2010) Speci f i cat i on f or Br azi ng Pr ocedur e and Per f or mance Qual i f i cat i on

ASME I NTERNATI ONAL ( ASME)

ASME B31. 1 ( 2014; I NT 1- 47) Power Pi pi ng

ASME B31. 5 ( 2013) Ref r i ger at i on Pi pi ng and Heat Tr ansf er Component s

ASME BPVC SEC I V ( 2010) BPVC Sect i on I V- Rul es f or Const r uct i on of Heat i ng Boi l er s

ASME BPVC SEC I X ( 2010) BPVC Sect i on I X- Wel di ng and Br azi ng Qualifications

ASME CSD- 1 ( 2012) Cont r ol and Saf et y Devi ces f or Aut omat i cal l y Fi r ed Boi l er s

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ASTM I NTERNATI ONAL ( ASTM)

ASTM A959 ( 2011) St andar d Gui de f or Speci f y i ng Har moni zed St andar d Gr ade Composi t i ons f or Wr ought St ai nl ess St eel s

ASTM B584 ( 2014) St andar d Speci f i cat i on f or Copper Al l oy Sand Cast i ngs f or Gener al Applications

ASTM C1071 ( 2012) St andar d Speci f i cat i on f or Fi br ous Gl ass Duct Li ni ng I nsul at i on ( Ther mal and Sound Absor bi ng Mat er i al )

ASTM C916 ( 2014) St andar d Speci f i cat i on f or Adhesi ves f or Duct Ther mal I nsul at i on

ASTM D1784 ( 2011) St andar d Speci f i cat i on f or Ri gi d Pol y( Vi nyl Chl or i de) ( PVC) Compounds and Chl or i nat ed Pol y( Vi nyl Chl or i de) ( CPVC) Compounds

ASTM D596 ( 2001; R 2011) Repor t i ng Resul t s of Anal ysi s of Wat er

ASTM E84 ( 2015b) St andar d Test Met hod f or Sur f ace Bur ni ng Char act er i st i cs of Bui l di ng Materials

ASTM F876 ( 2013a) Cr ossl i nked Pol yet hyl ene ( PEX) Tubing

COPPER DEVELOPMENT ASSOCI ATI ON ( CDA)

CDA A4015 ( 2010) Copper Tube Handbook

HYDRONI CS I NSTI TUTE DI VI SI ON OF AHRI ( HYI )

HI-004 ( 1995) Radi ant Fl oor Heat i ng

HYI-005 ( 2008) I =B=R Rat i ngs f or Boi l er s, Baseboar d Radi at i on and Fi nned Tube (Commercial)

MANUFACTURERS STANDARDI ZATI ON SOCI ETY OF THE VALVE AND FI TTI NGS

I NDUSTRY ( MSS)

MSS SP- 58 ( 1993; Reaf f i r med 2010) Pi pe Hanger s and Suppor t s - Mat er i al s, Desi gn and Manuf act ur e, Sel ect i on, Appl i cat i on, and Installation

MSS SP- 69 ( 2003; Not i ce 2012) Pi pe Hanger s and Suppor t s - Sel ect i on and Appl i cat i on ( ANSI Appr oved Amer i can Nat i onal St andar d)

NATI ONAL ELECTRI CAL MANUFACTURERS ASSOCI ATI ON ( NEMA)

NEMA 250 ( 2014) Encl osur es f or El ect r i cal Equi pment

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( 1000 Vol t s Maxi mum)

NEMA MG 1 ( 2014) Mot or s and Gener at or s

NATI ONAL FI RE PROTECTI ON ASSOCI ATI ON ( NFPA)

NFPA 54 ( 2015) Nat i onal Fuel Gas Code

NFPA 85 ( 2011; Er r at a 2011; AMD 1 2014) Boi l er and Combust i on Syst ems Hazar ds Code

NFPA 90A ( 2015) St andar d f or t he I nst al l at i on of Ai r Condi t i oni ng and Vent i l at i ng Syst ems

NFPA 90B ( 2015) St andar d f or t he I nst al l at i on of War m Ai r Heat i ng and Ai r Condi t i oni ng Systems

UNDERWRI TERS LABORATORI ES ( UL)

UL 1738 ( 2010; Repr i nt Nov 2014) Vent i ng Syst ems f or Gas- Bur ni ng Appl i ances, Cat egor i es I I , I I I and I V

UL 1995 ( 2011) Heat i ng and Cool i ng Equi pment

UL 795 ( 2011; Repr i nt Nov 2013) St andar d f or Commer ci al - I ndust r i al Gas Heat i ng Equi pment

UL FLAMMABLE & COMBUSTI BLE ( 2012) Fl ammabl e and Combust i bl e Li qui ds and Gases Equi pment Di r ect or y

1. 2 SUBMITTALS

Gover nment appr oval i s r equi r ed f or submi t t al s wi t h a " G" desi gnat i on;

submi t t al s not havi ng a " G" desi gnat i on ar e f or i nf or mat i on onl y. When used, a desi gnat i on f ol l owi ng t he " G" desi gnat i on i dent i f i es t he of f i ce t hat wi l l r evi ew t he submi t t al f or t he Gover nment . Submi t t al s wi t h an " S" ar e f or i ncl usi on i n t he Sust ai nabi l i t y Not ebook, i n conf or mance t o Sect i on 01 33 29 SUSTAI NABI LI TY REPORTI NG. Submi t t he f ol l owi ng i n accor dance wi t h Sect i on 01 33 00 SUBMI TTAL PROCEDURES:

SD- 02 Shop Dr awi ngs

Det ai l Dr awi ngs

SD- 03 Pr oduct Dat a

Mat er i al s and Equi pment Spar e Par t s Heat i ng Syst em Test s Fuel Syst em Test s Uni t Heat er s Welding Qualifications Fi el d I nst r uct i ons Tests Cast - I r on Condensi ng Boi l er s; G, AE Fi r e- Tube Condensi ng Boi l er s; G, AE

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Tr i m; G, AE Cont r ol s; G, AE Pumps; G, AE Radi ant Fl oor Heat i ng Syst ems; G, AE Fi nned Tube Radi at or s; G, AE Convent i onal Br eechi ng and St acks; G, AE

SD- 06 Test Repor t s

Heat i ng Syst em Test s Fuel Syst em Test s Wat er Tr eat ment Test i ng

SD- 07 Cer t i f i cat es

ENERGY STAR

SD- 10 Oper at i on and Mai nt enance Dat a

Oper at i on and Mai nt enance I nst r uct i ons

1. 3 QUALI TY ASSURANCE

Submi t a copy of qual i f i ed wel di ng pr ocedur es and a l i s t of names and i dent i f i cat i on symbol s of qual i f i ed wel der s and wel di ng oper at or s, at l east 2 weeks pr i or t o t he st ar t of wel di ng oper at i ons. Boi l er s and pi pi ng shal l be wel ded and br azed i n accor dance wi t h qual i f i ed pr ocedur es usi ng per f or mance- qual i f i ed wel der s and wel di ng oper at or s. Pr ocedur es and wel der s shal l be qual i f i ed i n accor dance wi t h ASME BPVC SEC I X. Wel di ng pr ocedur es qual i f i ed by ot her s, and wel der s and wel di ng oper at or s qual i f i ed by anot her empl oyer may be accept ed as per mi t t ed by ASME B31. 1. Not i f y t he Cont r act i ng Of f i cer 24 hour s i n advance of t est s, and t he t est s shal l be per f or med at t he wor k s i t e i f pr act i cal . The wel der or wel di ng oper at or shal l appl y t he per sonal l y assi gned symbol near each wel d made as a per manent r ecor d. St r uct ur al member s shal l be wel ded i n accor dance wi t h Sect i on 05 05 23. 16 STRUCTURAL WELDI NG.

1. 4 DELI VERY, STORAGE, AND HANDLI NG

Pr ot ect equi pment del i ver ed and pl aced i n st or age f r om t he weat her , humi di t y and t emper at ur e var i at i ons, di r t and dust , and ot her cont ami nant s.

1. 5 EXTRA MATERI ALS

Submi t spar e par t s dat a f or each di f f er ent i t em of mat er i al and equi pment speci f i ed, af t er appr oval of t he det ai l dr awi ngs and no l at er t han 2 mont hs pr i or t o t he dat e of benef i c i al occupancy. Submi t Det ai l Dr awi ngs consi st i ng of equi pment l ayout i ncl udi ng i nst al l at i on det ai l s and el ect r i cal connect i on di agr ams; combust i on and saf et y cont r ol di agr ams;

duct wor k l ayout showi ng t he l ocat i on of suppor t s and hanger s, t ypi cal hanger det ai l s , gauge r ei nf or cement , r ei nf or cement spaci ng r i gi di t y c l assi f i cat i on, and st at i c pr essur e and seal c l assi f i cat i ons; and pi pi ng l ayout showi ng t he l ocat i on of gui des and anchor s, t he l oad i mposed on each suppor t or anchor ( not r equi r ed f or r adi ant f l oor t ubi ng) , and t ypi cal suppor t det ai l s . I ncl ude on t he dr awi ngs any i nf or mat i on r equi r ed t o demonst r at e t hat t he syst em has been coor di nat ed and wi l l pr oper l y f unct i on as a uni t and t o show equi pment r el at i onshi p t o ot her par t s of t he wor k, i ncl udi ng c l ear ances r equi r ed f or oper at i on and mai nt enance. I ncl ude i n t he dat a a compl et e l i s t of par t s and suppl i es, wi t h cur r ent uni t pr i ces

SECTI ON 23 52 00 Page 4 and sour ce of suppl y, and a l i s t of t he par t s r ecommended by t he manuf act ur er t o be r epl aced af t er 1 and 3 year s of ser vi ce.

1. 6 WARRANTY

The condensi ng boi l er pr essur e vessel / heat exchanger shal l have a 10- year war r ant y agai nst f ai l ur e due t o condensat e cor r osi on, t her mal st r ess, mechani cal def ect s or wor kmanshi p. The condensi ng boi l er cont r ol panel shal l have a 2- year war r ant y agai nst f ai l ur e due t o def ect i ve mat er i al s or workmanship.

The r adi ant f l oor heat i ng syst em t ubi ng shal l have a 25- year war r ant y agai nst f ai l ur e due t o mat er i al s or wor kmanshi p. The r adi ant f l oor heat i ng syst em mani f ol ds, el ect r i cal and cont r ol par t s, shal l have a 2- year war r ant y agai nst f ai l ur e due t o mat er i al s or wor kmanshi p.

Al l war r ant i es shal l s t ar t begi nni ng on t he Benef i c i al Occupancy Dat e ( BOD) .

1. 6. 1 I ndexed Not ebook

The Cont r act or shal l f ur ni sh t o t he Cont r act i ng Of f i cer a bound and i ndexed not ebook cont ai ni ng a compl et e l i s t i ng of al l heat i ng wat er boi l er ( s) cover ed by a manuf act ur er ' s mul t i - year war r ant y. The heat i ng wat er boi l er ( s) l i s t shal l s t at e t he dur at i on of t he war r ant y t her eof , st ar t dat e of t he war r ant y, endi ng dat e of t he war r ant y, l ocat i on of t he war r ant ed equi pment , and t he poi nt of cont act f or f ul f i l l ment of t he war r ant y. Thi s i nf or mat i on shal l be pr ovi ded f or each heat i ng wat er boi l er ( s) and t he r ecor ded heat i ng wat er boi l er ( s) ser i al number s shal l i dent i f y each heat i ng wat er boi l er ( s) . Poi nt of cont act shal l i ncl ude t he name of t he ser vi ce r epr esent at i ve al ong wi t h t he day, ni ght , weekend, and hol i day phone number s f or a ser vi ce cal l . The compl et ed bound and i ndexed not ebook shal l be del i ver ed t o t he Cont r act i ng Of f i ce pr i or t o f i nal accept ance of t he f aci l i t y . The Cont r act or shal l f ur ni sh wi t h each manuf act ur er ' s mul t i - year war r ant y t he name, addr ess, and t el ephone number ( day, ni ght , weekend, and hol i day) of t he ser vi ce r epr esent at i ve near est t o t he l ocat i on wher e t he equi pment i s i nst al l ed. Upon a r equest f or ser vi ce under t he mul t i - year war r ant y, t he ser vi ce r epr esent at i ve shal l honor t he war r ant y dur i ng t he war r ant y per i od, and shal l pr ovi de t he ser vi ces pr escr i bed by t he t er ms of t he war r ant y.

1. 6. 2 Equi pment War r ant y Tags

At t he t i me of i nst al l at i on, each i t em of manuf act ur er ' s mul t i - year war r ant ed equi pment shal l be t agged wi t h a dur abl e, oi l - and wat er - r esi st ant t ag, sui t abl e f or i nt er i or and ext er i or l ocat i ons, r esi st ant t o sol vent s, abr asi on, and f adi ng due t o sunl i ght . The t ag shal l be at t ached wi t h copper wi r e or a per manent , pr essur e- sensi t i ve, adhesi ve backi ng. The t ag shal l be i nst al l ed i n an easi l y not i ced l ocat i on at t ached t o t he war r ant ed equi pment . The t ag f or t hi s equi pment shal l be s i mi l ar t o t he f ol l owi ng i n f or mat , and shal l cont ai n al l of t he l i s t ed i nf or mat i on:

MANUFACTURER' S MULTI - YEAR WARRANTY EQUI PMENT TAG

Equi pment / Pr oduct Cover ed: ____________________ Manuf act ur er : _______Model No. : _____Ser i al No. : __ War r ant y Per i od: Fr om _________t o _____________ Cont r act No. : _________________________________ War r ant y Cont act : _____________________________ Name: _________________________________________ Addr ess: ______________________________________

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Tel ephone: ____________________________________

STATI ON PERSONNEL SHALL PERFORM PREVENTI VE

MAI NTENANCE AND OPERATI ONAL MAI NTENANCE

1. 7 EXTRA MATERI ALS

Fur ni sh ext r a mat er i al s descr i bed bel ow t hat mat ch pr oduct s i nst al l ed and t hat ar e packaged wi t h pr ot ect i ve cover i ng f or st or age and i dent i f i ed wi t h l abel s descr i bi ng cont ent s.

a. Mechani cal Seal s: One mechani cal seal f or each pump.

b. Cabi net Uni t Heat er Fi l t er s: Fur ni sh one spar e f i l t er f or each uni t .

PART 2 PRODUCTS

2. 1 MATERI ALS AND EQUI PMENT

2. 1. 1 St andar d Pr oduct s

Pr ovi de mat er i al s and equi pment whi ch ar e t he st andar d pr oduct s of a manuf act ur er r egul ar l y engaged i n t he manuf act ur e of t he pr oduct s and t hat essent i al l y dupl i cat e i t ems t hat have been i n sat i sf act or y use f or at l east 2 year s pr i or t o bi d openi ng. Equi pment shal l be suppor t ed by a ser vi ce or gani zat i on t hat i s , i n t he opi ni on of t he Cont r act i ng Of f i cer , r easonabl y conveni ent t o t he s i t e. Submi t manuf act ur er ' s cat al og dat a i ncl uded wi t h t he det ai l dr awi ngs f or t he f ol l owi ng:

a. Radi ant f l oor heat i ng syst em i ncl udi ng t ubi ng, j oi nt s, and mani f ol d f or r adi ant f l oor heat i ng syst ems.

b. Dat a showi ng model , s i ze, opt i ons, et c. , t hat ar e i nt ended f or consi der at i on. Dat a submi t t ed shal l be adequat e t o demonst r at e compl i ance wi t h cont r act r equi r ement s. Dat a shal l i ncl ude manuf act ur er ' s wr i t t en i nst al l at i on i nst r uct i ons and manuf act ur er ' s r ecommendat i ons f or oper at i on and mai nt enance cl ear ances f or t he following:

( 1) Boi l er s ( 2) Uni t Heat er s ( 3) Fuel Bur ni ng Equi pment ( 4) Combust i on Cont r ol Equi pment ( 5) Pumps ( 6) Fi t t i ngs and Accessor i es

2. 1. 2 Asbest os Pr ohi bi t i on

Asbest os and asbest os- cont ai ni ng pr oduct s wi l l not be al l owed.

2. 1. 3 Nameplates

Secur e a pl at e t o each maj or component of equi pment cont ai ni ng t he manuf act ur er ' s name, addr ess, t ype or st y l e, model or ser i al number , and cat al og number . Al so, di spl ay an ENERGY STAR l abel as appl i cabl e. Each pr essur e vessel shal l have an appr oved ASME st amp.

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2. 1. 4 Equi pment Guar ds

Bel t s, pul l eys, chai ns, gear s, coupl i ngs, pr oj ect i ng set scr ews, keys, and ot her r ot at i ng par t s exposed t o per sonnel cont act shal l be f ul l y encl osed or guar ded i n accor dance wi t h OSHA r equi r ement s. Hi gh t emper at ur e equi pment and pi pi ng exposed t o cont act by per sonnel or wher e i t cr eat es a pot ent i al f i r e hazar d shal l be pr oper l y guar ded or cover ed wi t h i nsul at i on of a t ype speci f i ed.

2. 2 BOILERS

Each boi l er shal l have t he out put capaci t y i n Br i t i sh t her mal uni t s per hour ( Bt uh) as i ndi cat ed when f i r ed wi t h t he speci f i ed f uel s. The boi l er shal l be f ur ni shed compl et e wi t h t he gas bur ni ng equi pment , boi l er f i t t i ngs and t r i m, aut omat i c cont r ol s, bur ner , el ect r i cal wi r i ng, i nsul at i on, pi pi ng connect i ons, and pr ot ect i ve j acket . The boi l er shal l be compl et el y assembl ed and t est ed at t he manuf act ur er ' s pl ant . The boi l er and i t s accessor i es shal l be desi gned and i nst al l ed t o per mi t r eady accessi bi l i t y f or oper at i on, mai nt enance, and ser vi ce. Boi l er s shal l be desi gned, const r uct ed, and equi pped i n accor dance wi t h ASME BPVC SEC I V. Each boi l er shal l be of t he cast i r on condensi ng t ype and desi gned f or wat er ser vi ce as speci f i ed her ei n. The boi l er capaci t y shal l be based on t he r at i ngs shown in HYI-005 or as cer t i f i ed by t he Amer i can Boi l er Manuf act ur er s Associ at i on, or Amer i can Gas Associ at i on.

2. 2. 1 Condensi ng Boi l er

Each boi l er shal l be a sel f - cont ai ned packaged t ype, compl et e wi t h accessor i es, mount ed on a st r uct ur al st eel base or a st eel base whi ch i s i nt egr al t o t he boi l er shel l . Each boi l er shal l conf or m t o t he commer ci al desi gn used by t he manuf act ur er and shal l per mi t f r ee t her mal expansi on wi t hout pl aci ng undue st r ess on any par t of t he boi l er . Each boi l er whi ch exper i ences t he f or mat i on of condensat e wi t hi n t he f l ue gas shal l be speci f i cal l y desi gned f or condensi ng appl i cat i on. Each boi l er shal l wi t hst and t he cor r osi ve ef f ect s of condensat e f or each par t whi ch may be i n cont act wi t h t he condensat e at al l possi bl e oper at i ng condi t i ons. Each boi l er shal l be pr ovi ded wi t h a separ at e ai r i nt ake, exhaust , and condensat e dr ai n. Each boi l er shal l be desi gned t o wi t hst and t he wat er t emper at ur e di f f er ent i al s ant i c i pat ed at t he r equi r ed oper at i ng condi t i ons wi t hout exper i enci ng any damage due t o t her mal shock.

2. 2. 1. 1 Cast - I r on Condensi ng Boi l er s

a. The combust i on chamber shal l be const r uct ed of cast - i r on. I t shal l be a down- f i r ed desi gn ut i l i z i ng l i ght wei ght r ef r act or y ar ound t he bur ner housing.

b. Boi l er s shal l be a cast i r on sect i onal uni t desi gned f or pr essur e f i r i ng and shal l be const r uct ed and t est ed f or 100 psi wat er wor ki ng pr essur e, i n accor dance wi t h t he ASME Sect i on I V Rul es f or t he Const r uct i on of Heat i ng Boi l er s. I ndi v i dual sect i ons wi l l have been subj ect ed t o a hydr ost at i c pr essur e t est of 250 psi g at t he f act or y bef or e shi pment and t hey shal l be mar ked, st amped or cast wi t h t he ASME Code symbol . Boi l er s wi t h l ess t han 250- psi pr essur e t est wi l l not be accept abl e f or t hi s pr oj ect . The sect i ons shal l be of a down f i r ed count er f l ow si ngl e- pass desi gn. Wat er por t s wi l l be seal ed wi t h gr aphi t e por t connect or s. The sect i ons wi l l be f ul l y machi ned f or met al t o met al seal i ng of t he gas s i de sur f aces. The desi gn wi l l pr ovi de f or equal t emper at ur e r i se t hr ough al l sect i ons. The heat

SECTI ON 23 52 00 Page 7 exchanger shal l be desi gned t o pr event f l ui d boi l i ng. The i r on shal l have a mi ni mum t hi ckness of 1/ 4 i nch. The heat exchanger desi gn shoul d have no l i mi t at i ons on t emper at ur e r i se or r est r i c t i ons t o i nl et wat er t emper at ur e and a Cv of 60.

c. Jacket s shal l be const r uct ed of st ai nl ess st eel .

d. The gas bur ner shal l be met al f i ber mesh const r uct i on, al l owi ng hi gh t ur ndown of t he f uel - ai r mi xt ur e. The bur ner f l ame shal l bur n hor i zont al l y and be of t he pr e- mi x t ype wi t h a f or ced dr af t f an.

Bur ner shal l f i r e t o pr ovi de equal di st r i but i on of heat t hr oughout t he ent i r e heat exchanger . The bur ner shal l be easi l y r emoved f or mai nt enance wi t hout t he di sr upt i on of any ot her maj or component of t he boi l er . A wi ndow vi ew por t shal l be pr ovi ded f or v i sual i nspect i on of t he boi l er dur i ng f i r i ng. The gas di st r i but i on component s and bur ner shal l be encl osed wi t h a cast - al umi num housi ng.

e. The i gni t i on har dwar e shal l consi st of Al umi na cer ami c i nsul at ed i gni t i on el ect r odes and UV sensi ng t ube per manent l y ar r anged t o ensur e pr oper i gni t i on el ect r ode and UV al i gnment .

f . The boi l er shal l be capabl e of oper at i ng at r at ed capaci t y wi t h pr essur es as l ow as 2 i nches wc at t he i nl et t o t he bur ner pr essur e regulator.

g. The bur ner shal l be capabl e of 99 per cent ef f i c i ency wi t hout exceedi ng a NOx r eadi ng above 11 ppm.

h. The bur ner and gas t r ai n shal l be pr ovi ded wi t h t he f ol l owi ng t r i m and features:

1. Bur ner Fi r i ng: Ful l modul at i on wi t h 5: 1 t ur ndown at Cont i nuous CO2

2. Bur ner I gni t i on: I nt er r upt ed spar k

3. Saf et y Cont r ol s: Ener gi ze i gni t i on, l i mi t t i me f or est abl i shi ng f l ame, pr event openi ng of gas val ve unt i l pi l ot f l ame i s pr oven, st op gas f l ow on i gni t i on f ai l ur e, and al l ow gas val ve t o open.

4. Fl ue- Gas Col l ect or : Encl osed combust i on chamber wi t h i nt egr al combust i on- ai r bl ower and si ngl e vent i ng connect i on.

5. Gas Tr ai n: Manual gas val ves ( 2) , mai n gas val ve ( sol enoi d) , manual t est and check val ves, pi l ot gas pr essur e r egul at or , and aut omat i c pi l ot gas val ve. Al l component s t o be f act or y mount ed and CSD- 1 compl i ant .

6. Saf et y Devi ces: Low gas pr essur e swi t ch, ai r - f l ow swi t ch, and bl ocked f l ue det ect i on swi t ch, l ow wat er cut of f ( manual r eset ) , hi gh t emper at ur e manual r eset . Al l saf et i es t o be f act or y mount ed.

7. I ndi v i dual gas r egul at or pr ovi ded by f act or y, shi pped l oose f or f i el d i nst al l at i on, one per boi l er .

2. 2. 1. 2 Fi r e- Tube Condensi ng Boi l er s

a. Fact or y- f abr i cat ed, - assembl ed, and - t est ed, f i r e- t ube condensi ng boi l er wi t h heat exchanger seal ed pr essur e t i ght , bui l t on a st eel base; i ncl udi ng i nsul at ed j acket ; f l ue- gas vent ; combust i on- ai r i nt ake

SECTI ON 23 52 00 Page 8 connect i ons; wat er suppl y, r et ur n, and condensat e dr ai n connect i ons;

and cont r ol s. Wat er heat i ng ser v i ce onl y.

b. Heat exchanger wi l l be a nonf er r ous, cor r osi on- r esi st ant combust i on chamber.

c. Pr essur e Vessel wi l l be of car bon st eel wi t h wel ded heads and t ube connections.

d. Bur ner wi l l be nat ur al gas, f or ced dr af t .

e. Bl ower wi l l i nc l ude a cent r i f ugal f an t o oper at e dur i ng each bur ner f i r i ng sequence and t o pr epur ge and post pur ge t he combust i on chamber .

f . Gas Tr ai n wi l l i nc l ude a combi nat i on gas val ve wi t h manual shut of f and pr essur e r egul at or .

g. The syst em wi l l i nc l ude spar k i gni t i on wi t h 100 per cent mai n- val ve shut of f wi t h el ect r oni c f l ame super vi s i on.

h. Casi ng wi l l i nc l ude t he f ol l owi ng:

1. Jacket : Sheet met al or pl ast i c, wi t h snap- i n or i nt er l ocki ng closures.

2. Cont r ol Compar t ment Encl osur es: NEMA 250, Type 1A.

3. Fi ni sh: Baked- enamel or powder - coat ed pr ot ect i ve f i ni sh.

4. I nsul at i on: Mi ni mum 2- i nch t hi ck, mi ner al - f i ber i nsul at i on sur r oundi ng t he heat exchanger .

5. Combust i on- Ai r Connect i ons: I nl et and vent duct col l ar s.

2. 2. 2 Modul ar Conf i gur at i on

Modul ar boi l er s shal l be of t he condensi ng t ype. Modul ar boi l er s shal l have t he capabi l i t y of i ndependent oper at i on. Upon f ai l ur e of any modul e, t he r emai ni ng modul es shal l be capabl e of oper at i ng at t hei r desi gned capaci t y. The s i ze of t he i ndi v i dual modul es shal l be as i ndi cat ed.

2. 2. 3 Hot Wat er Heat i ng Boi l er s

The hot wat er heat i ng boi l er shal l be capabl e of oper at i ng at t he speci f i ed maxi mum cont i nuous capaci t y wi t hout damage or det er i or at i on t o t he boi l er , i t s set t i ng, f i r i ng equi pment , or auxi l i ar i es. The r at ed capaci t y shal l be t he capaci t y at whi ch t he boi l er wi l l oper at e cont i nuousl y whi l e mai nt ai ni ng at l east t he speci f i ed mi ni mum ef f i c i ency. The boi l er desi gn condi t i ons shal l be as schedul ed on t he dr awi ngs.

2. 3 TRIM

a. Aquast at Cont r ol l er s: Oper at i ng, f i r i ng r at e, and hi gh l i mi t .

b. Saf et y Rel i ef Val ve: 50 psi . ASME r at ed.

c. Pr essur e and Temper at ur e Gauge: Mi ni mum 3- 1/ 2- i nch di amet er , combi nat i on wat er - pr essur e and - t emper at ur e gauge. Gauges shal l have oper at i ng- pr essur e and - t emper at ur e r anges so nor mal oper at i ng r ange i s

SECTI ON 23 52 00 Page 9 about 50 per cent of f ul l r ange.

d. Boi l er Ai r Vent : Aut omat i c.

e. Dr ai n Val ve: Mi ni mum NPS 3/ 4 hose- end gat e val ve.

f . Condensat e neut r al i zat i on t o be pr ovi ded by boi l er manuf act ur er f or each boi l er condensat e dr ai n and al l f l ue condensat e dr ai ns.

2. 4 CONTROLS

a. Boi l er oper at i ng cont r ol s shal l i ncl ude t he f ol l owi ng devi ces and features:

1. Cont r ol t r ansf or mer .

2. Set - Poi nt Adj ust : Set poi nt s shal l be adj ust abl e.

3. Sequence of Oper at i on: El ect r i c , f act or y- f abr i cat ed and f i el d- i nst al l ed panel t o cont r ol bur ner f i r i ng r at e t o r eset suppl y- wat er t emper at ur e i nver sel y wi t h out s i de- ai r t emper at ur e.

At 0 degr ees F out s i de- ai r t emper at ur e, set suppl y- wat er t emper at ur e at 140 degr ees F ( adj ust abl e) at 60 degr ees F out s i de- ai r t emper at ur e, set suppl y- wat er t emper at ur e at 100 degr ees F ( adj ust abl e) above 60 degr ees F, set suppl y wat er t emper at ur e at 100 degr ees F ( adj ust abl e) .

4. I ncl ude aut omat i c, al t er nat i ng- f i r i ng sequence f or mul t i pl e boi l er s t o ensur e maxi mum syst em ef f i c i ency t hr oughout t he l oad r ange and t o pr ovi de equal r unt i me f or boi l er s.

b. Bur ner Oper at i ng Cont r ol s: To mai nt ai n saf e oper at i ng condi t i ons, bur ner saf et y cont r ol s l i mi t bur ner oper at i on.

1. Hi gh Cut of f : Aut omat i c r eset st ops bur ner i f oper at i ng condi t i ons r i se above maxi mum boi l er desi gn t emper at ur e 210 degr ees F.

2. Low- Wat er Cut of f Swi t ch: El ect r oni c pr obe shal l pr event bur ner oper at i on on l ow wat er . Cut of f swi t ch shal l be manual - r eset t ype.

3. Bl ocked I nl et Saf et y Swi t ch: Manual - r eset pr essur e swi t ch f i el d mount ed on boi l er combust i on- ai r i nl et .

4. Audi bl e Al ar m: Fact or y mount ed on cont r ol panel wi t h s i l ence swi t ch; shal l sound al ar m f or above condi t i ons.

c. Bui l di ng Management Syst em I nt er f ace: Fact or y i nst al l har dwar e and sof t war e t o enabl e bui l di ng management syst em t o moni t or , cont r ol , and di spl ay boi l er s t at us and al ar ms.

1. Har dwi r ed Poi nt s:

( a) Moni t or i ng: On/ of f st at us, common t r oubl e al ar m and l ow wat er l evel al ar m.

( b) Cont r ol : On/ of f oper at i on, hot wat er suppl y t emper at ur e set - poi nt adj ust ment .

2. A communi cat i on i nt er f ace wi t h bui l di ng management syst em shal l

SECTI ON 23 52 00 Page 10 enabl e bui l di ng management syst em oper at or t o r emot el y cont r ol and moni t or t he boi l er pl ant f r om an oper at or wor kst at i on. Cont r ol f eat ur es avai l abl e, and moni t or i ng poi nt s di spl ayed, l ocal l y at boi l er cont r ol panel shal l be avai l abl e t hr ough bui l di ng management syst em.

3. Communi cat i on pr ot ocol shal l be coor di nat ed wi t h t he t emper at ur e cont r ol s cont r act or f or cor r ect communi cat i on.

4. Ref er t o Sect i on 23 09 23 LONWORKS DI RECT DI GI TAL CONTROL FOR HVAC AND OTHER BUI LDI NG CONTROL SYSTEMS f or addi t i onal i nf or mat i on.

2. 5 FUEL BURNI NG EQUI PMENT

Boi l er shal l be desi gned t o bur n gas. Each boi l er shal l compl y wi t h Feder al , st at e, and l ocal emi ssi on r egul at i ons. As a mi ni mum, t he f ol l owi ng emi ssi on r equi r ement s shal l be met :

NOx - 0. 16 l b/ hr .

SO2 - 0. 00096 l b/ hr .

Par t i cul at e - 0. 012 l b/ hr .

2. 5. 1 Burners

2. 5. 1. 1 Gas Fi r ed Bur ner s and Cont r ol s

Bur ner s shal l be UL appr oved. Bur ner shal l be pr ovi ded compl et e wi t h f uel suppl y syst em i n conf or mance wi t h t he f ol l owi ng saf et y codes or st andar ds:

a. Gas- f i r ed uni t s wi t h i nput s gr eat er t han 400, 000 Bt uh per combust i on chamber shal l conf or m t o UL 795. Gas f i r ed uni t s l ess t han 12, 500, 000 Bt uh i nput shal l conf or m t o ANSI Z21. 13/ CSA 4. 9.

2. 6 COMBUSTI ON CONTROL EQUI PMENT

Combust i on cont r ol equi pment shal l be pr ovi ded as a syst em by a s i ngl e manuf act ur er . Fi el d i nst al l ed aut omat i c combust i on cont r ol syst em shal l be i nst al l ed i n accor dance wi t h t he manuf act ur er ' s r ecommendat i ons and under t he di r ect super vi s i on of a r epr esent at i ve of t he cont r ol manuf act ur er . The boi l er wat er t emper at ur e shal l be cont r ol l ed by a wat er t emper at ur e cont r ol l er . The equi pment shal l oper at e el ect r i cal l y . On mul t i pl e boi l er i nst al l at i ons, each boi l er uni t shal l have a compl et el y i ndependent syst em of cont r ol s r espondi ng t o t he l oad and t o a pl ant mast er cont r ol l er .

2. 6. 1 Boi l er Combust i on Cont r ol s and Posi t i oner s

a. Gas boi l er uni t s shal l be pr ovi ded wi t h modul at i ng combust i on cont r ol s wi t h gas pi l ot or spar k i gni t i on. Modul at i ng cont r ol s shal l be pr ovi ded wi t h a means f or manual l y cont r ol l i ng t he f i r i ng r at e.

b. Modul at i ng cont r ol f unct i on shal l be accompl i shed usi ng posi t i oni ng t ype cont r ol s. Ai r f l ow r at i o and f uel cont r ol val ve shal l be cont r ol l ed by r el at i ve posi t i ons of oper at i ve l ever s on a j ackshaf t r espondi ng t o a wat er t emper at ur e cont r ol l er . Posi t i oni ng t ype combust i on cont r ol equi pment shal l i ncl ude dr af t cont r ol s wi t h synchr oni zed f uel f eed and combust i on ai r suppl y cont r ol s, whi l e and shal l mai nt ai n t he pr oper ai r / f uel r at i o. The desi r ed f ur nace dr af t

SECTI ON 23 52 00 Page 11 shal l be mai nt ai ned wi t hi n 0. 01 i nch of wat er col umn.

2. 6. 2 Combust i on Saf et y Cont r ol s and Equi pment

Combust i on saf et y cont r ol s and equi pment shal l be UL l i s t ed, mi cr opr ocessor - based di st r i but ed pr ocess cont r ol l er . The syst em shal l i ncl ude mount i ng har dwar e, wi r i ng and cabl es, and associ at ed equi pment .

The cont r ol l er shal l be mount ed compl et el y wi r ed, pr ogr ammed, debugged, and t est ed t o per f or m al l of i t s f unct i ons. The cont r ol l er shal l pr ocess t he s i gnal s f or compl et e cont r ol and moni t or i ng of t he boi l er . Thi s shal l i ncl ude mai nt ai ni ng boi l er st at us, st ar t i ng and st oppi ng al l cont r ol f unct i ons, sequenci ng cont r ol f unct i ons and si gnal i ng al ar m condi t i ons.

The pr ogr am shal l be document ed and i ncl ude cr oss r ef er ences i n descr i pt i on of coi l s and cont act s. Mi cr opr ocessor shal l be abl e t o per f or m sel f di agnost i cs and cont ai n a message cent er t o pr ovi de oper at or wi t h st at us and f ai l ur e mode i nf or mat i on. Cont r ol l er s f or each boi l er shal l be mount ed on a separ at e, f r ee st andi ng panel adj acent t o t he boi l er or f or packaged boi l er s on t he boi l er suppor t i ng st r uct ur e. Cont r ol syst ems and saf et y devi ces f or aut omat i cal l y f i r ed boi l er s shal l conf or m t o ASME CSD- 1.

El ect r i cal combust i on and saf et y cont r ol s shal l be r at ed at 120 vol t s, s i ngl e phase, 60 Hz and shal l be connect ed as speci f i ed i n Sect i on 26 20 00 I NTERI OR DI STRI BUTI ON SYSTEM. I ndi cat i ng l i ght s shal l be pr ovi ded on t he cont r ol panel . A r ed l i ght shal l i ndi cat e f l ame f ai l ur e, and a gr een l i ght shal l i ndi cat e t hat t he mai n f uel val ve i s open. The f ol l owi ng shut down condi t i ons shal l r equi r e a manual r eset bef or e t he boi l er can aut omat i cal l y recycle:

a. Fl ame f ai l ur e.

b. Fai l ur e t o est abl i sh pi l ot f l ame.

c. Fai l ur e t o est abl i sh mai n f l ame.

d. Hi gh t emper at ur e cut of f .

2. 6. 2. 1 Wat er Fl ow I nt er l ock

Hot wat er boi l er l i mi t cont r ol s shal l be pr ovi ded t o i ncl ude pr ot ect i on f or l ow boi l er wat er f l ow and hi gh boi l er wat er t emper at ur e. The l i mi t cont r ol s shal l be i nt er l ocked wi t h t he combust i on cont r ol syst em t o ef f ect boi l er al ar m and shut down. The cont r ol s shal l not al l ow boi l er st ar t up unl ess hot wat er f l ow i s pr oven.

2. 7 ELECTRI CAL POWER

a. Cont r ol l er s, El ect r i cal Devi ces, and Wi r i ng: El ect r i cal devi ces and connect i ons ar e speci f i ed i n Di v i s i on 26 Sect i ons.

1. Ver i f y wi t h uni t manuf act ur er . Coor di nat e wi t h el ect r i cal contractor.

b. Si ngl e- Poi nt Fi el d Power Connect i on: Fact or y- i nst al l ed and - wi r ed swi t ches, mot or cont r ol l er s, t r ansf or mer s, and ot her el ect r i cal devi ces necessar y shal l pr ovi de a s i ngl e- poi nt f i el d power connect i on t o boi l er .

1. House i n NEMA 250, Type 1 encl osur e.

2. Wi r i ng shal l be number ed and col or - coded t o mat ch wi r i ng di agr am.

SECTI ON 23 52 00 Page 12

3. I nst al l f act or y wi r i ng out s i de of an encl osur e i n a met al r aceway.

4. Fi el d power i nt er f ace shal l be t o wi r e l ugs.

5. Pr ovi de br anch power c i r cui t t o each mot or and t o cont r ol s wi t h a di sconnect swi t ch or c i r cui t br eaker .

6. Pr ovi de each mot or wi t h over cur r ent pr ot ect i on.

2. 8 VENTI NG KI TS

a. Ki t : Compl et e syst em, ASTM A959, Type AL 29- 4C st ai nl ess st eel , pi pe, vent t er mi nal , t hi mbl e, i ndoor pl at e, vent adapt er , condensat e t r ap and di l ut i on t ank, and seal ant .

b. Combust i on- Ai r I nt ake: Compl et e syst em, Schedul e 40 PVC, pi pe, vent t er mi nal wi t h scr een, i nl et ai r coupl i ng, and seal ant .

c. Type AL 29- 4C si ze per manuf act ur er :

1. Ver i f y act ual s i zes wi t h uni t manuf act ur er , based on pr oj ect r equi r ement s, r out i ng, and l ayout . Boi l er manuf act ur er t o ver i f y r out i ng and si z i ng pr i or t o i nst al l at i on.

2. 9 PUMPS

2. 9. 1 Hot Wat er Ci r cul at i ng Pumps

a. The pumps shal l be separ at el y coupl ed, ver t i cal , i n- l i ne cent r i f ugal type.

b. Descr i pt i on: Fact or y- assembl ed and - t est ed, cent r i f ugal , over hung- i mpel l er , separ at el y coupl ed, i n- l i ne pump desi gned f or i nst al l at i on wi t h pump and mot or shaf t s mount ed ver t i cal l y . Rat e pump f or 175- psi g mi ni mum wor ki ng pr essur e and a cont i nuous wat er t emper at ur e of 225 degr ees F.

c. Pump Const r uct i on

1. Casi ng: Radi al l y spl i t , cast i r on, wi t h r epl aceabl e br onze wear r i ngs, t hr eaded gauge t appi ngs at i nl et and out l et , and t hr eaded compani on- f l ange connect i ons.

2. I mpel l er : ASTM B584, cast br onze; st at i cal l y and dynami cal l y bal anced, keyed t o shaf t , and secur ed wi t h a l ocki ng cap scr ew.

Tr i m i mpel l er t o mat ch speci f i ed per f or mance.

3. Pump Shaf t : St eel , wi t h copper - al l oy shaf t s l eeve.

4. Mechani cal Seal : Car bon r ot at i ng r i ng agai nst a cer ami c seat hel d by a st ai nl ess- st eel spr i ng, and EPT bel l ows and gasket . I ncl ude wat er s l i nger on shaf t bet ween mot or and seal .

5. Pump Bear i ngs: Oi l l ubr i cat ed; br onze- j our nal or t hr ust t ype.

d. Shaf t Coupl i ng: Axi al l y spl i t spacer coupl i ng.

e. NEMA Pr emi um Ef f i c i ent Mot or : Si ngl e speed, wi t h per manent l y l ubr i cat ed or gr ease- l ubr i cat ed bal l bear i ngs, unl ess ot her wi se

SECTI ON 23 52 00 Page 13 i ndi cat ed; r i gi dl y mount ed t o pump casi ng wi t h l i f t i ng eye and suppor t i ng l ugs i n mot or encl osur e. Mot or shal l be nonover l oadi ng t hr oughout t he ent i r e pump cur ve.

2. 9. 2 Radi ant Fl oor and Coi l Ci r cul at i ng Pumps

a. Each pump shal l be capabl e of del i ver i ng t he schedul ed GPM when oper at i ng at a t ot al devel oped head as denot ed on t he Dr awi ngs.

b. Each pump shal l be of t he hor i zont al i n- l i ne, oi l - l ubr i cat ed t ype, sui t abl e f or 125 psi g wor ki ng pr essur e. Pump body shal l be br onze or cast i r on wi t h br ass or gl ass- f i l l ed pol yet hyl ene i mpel l er , heat t r eat ed car bon st eel shaf t , mechani cal seal ( packed gl and seal f or open l oop condenser wat er syst ems) , br onze sl eeve- oi l l ubr i cat ed bear i ngs, f l exi bl e spr i ng coupl er , and r i ng mount ed non- over l oadi ng mot or . NEMA pr emi um ef f i c i ent mot or shal l be open, dr i p- pr oof , s l eeve bear i ng, qui et oper at i ng, r ubber mount ed const r uct i on, havi ng bui l t - i n t her mal over l oad pr ot ect i on.

c. The pump shal l be f act or y t est ed, t hor oughl y c l eaned, and pai nt ed wi t h one coat of machi ner y enamel pr i or t o shi pment . A set of i nst al l at i on i nst r uct i ons shal l be i ncl uded wi t h t he pump at t he t i me of shi pment .

d. Coi l c i r cul at i ng pumps shal l be f r om same manuf act ur er as separ at el y coupl ed, ver t i cal , i n- l i ne cent r i f ugal pumps.

2. 10 COLD WATER CONNECTI ONS

Connect i ons shal l be pr ovi ded whi ch i ncl udes consecut i vel y i n l i ne a st r ai ner , r educed pr essur e pr i nci pl e backf l ow pr event er s, and wat er pr essur e r egul at or i n t hat or der i n t he di r ect i on of t he f l ow. The r educed pr essur e pr i nci pl e backf l ow pr event er s shal l be pr ovi ded as i ndi cat ed and i n compl i ance wi t h Sect i on 22 00 00 PLUMBI NG, GENERAL PURPOSE. Col d wat er f i l l connect i ons shal l be made t o t he wat er suppl y syst em as i ndi cat ed.

Necessar y pi pe, f i t t i ngs, and val ves r equi r ed f or wat er connect i ons bet ween t he boi l er and col d wat er mai n shal l be pr ovi ded as shown. The pr essur e r egul at i ng val ve shal l be of a t ype t hat wi l l not st i ck or al l ow pr essur e t o bui l d up on t he l ow si de. The val ve shal l be set t o mai nt ai n a t er mi nal pr essur e of appr oxi mat el y, l at el y 5 psi i n excess of t he st at i c head on t he syst em and shal l oper at e wi t hi n a 2 psi t ol er ance r egar dl ess of col d wat er suppl y pi pi ng pr essur e and wi t hout obj ect i onabl e noi se under any condi t i on of oper at i on.

2. 11 RADI ANT FLOOR HEATI NG SYSTEMS

The r adi ant f l oor heat i ng syst em shal l i ncl ude al l pi pi ng, mani f ol ds, val ves, pumps, expansi on t ank, pr essur e r el i ef val ves, and cont r ol s t o pr ovi de a compl et e and oper at i onal heat i ng syst em.

2. 11. 1 Tubing

The t ubi ng mat er i al shal l compl y wi t h ASTM F876. The pi pi ng shal l be pr ovi ded wi t h a f act or y appl i ed oxygen bar r i er wi t h a di f f usi on r at e t hat does not exceed 0. 1 gr ams per cubi c met er per day. The pi pi ng shal l be r at ed at 100 psi and 180 degr ees F.

2. 11. 2 Joints

The mani f ol d manuf act ur er shal l be consul t ed t o det er mi ne t he pr oper j oi nt

SECTI ON 23 52 00 Page 14 f or connect i on of t ubi ng t o t he mani f ol d. The j oi nt s r equi r ed t o connect t he t ubi ng t o t he mani f ol d shal l be compr essi on t ype f i t t i ngs usi ng cr i mp r i ngs, a combi nat i on of i nser t s and O- r i ngs, gr i pper t ype f i t t i ngs usi ng a r et ai ner r i ng and O- r i ngs, or as ot her wi se r ecommended by t he mani f ol d and t ubi ng manuf act ur er .

2. 11. 3 Manifold

The desi gn and const r uct i on of t he mani f ol d shal l be compat i bl e wi t h t he t ubi ng manuf act ur e' s r equi r ement s. The pi pi ng mani f ol d mat er i al shal l be compat i bl e wi t h t he pi pi ng mat er i al . The mani f ol d shal l be capabl e of pr ovi di ng t he number of c i r cui t s as i ndi cat ed on t he dr awi ngs. The mani f ol d shal l be sui t abl e f or an oper at i ng pr essur e of 100 psi and 180 degr ees F. Bal anci ng val ves shal l be pr ovi ded f or each ci r cui t . I sol at i on val ves shal l be pr ovi ded f or each suppl y and r et ur n connect i on. Each mani f ol d shal l be pr ovi ded wi t h an ai r vent . The mani f ol d shal l al l ow f or t he measur ement of t emper at ur e f or each ci r cui t . The mani f ol d shal l be pr ovi ded wi t h al l r equi r ed mount i ng har dwar e.

2. 11. 4 Insulation

I nst al l an under - s l ab bl anket t ype i nsul at i on. Ref er t o det ai l s on t he dr awi ngs and manuf act ur er ' s i nst al l at i on r ecommendat i ons.

2. 12 UNI T HEATERS

2. 12. 1 Cabi net Uni t Heat er s

a. Descr i pt i on: A f act or y- assembl ed and - t est ed uni t compl yi ng wi t h

AHRI 440.

b. Coi l Sect i on I nsul at i on: ASTM C1071; sur f aces exposed t o ai r st r eam shal l be al umi num- f oi l f aci ng or er osi on- r esi st ant coat i ng t o pr event er osi on of gl ass f i ber s.

1. Thi ckness: 1/ 2 i nch.

2. Ther mal Conduct i v i t y ( k- Val ue) : 0. 26 Bt u x i nch/ h by sq. f t . at 75 degr ees F mean t emper at ur e.

3. Fi r e- Hazar d Cl assi f i cat i on: Maxi mum f l ame- spr ead i ndex of 25 and smoke- devel oped i ndex of 50 when t est ed accor di ng t o ASTM E84.

4. Adhesi ve: Compl y wi t h ASTM C916 and wi t h NFPA 90A or NFPA 90B.

c. Cabi net : St eel wi t h baked- enamel f i ni sh wi t h manuf act ur er ' s st andar d pai nt , i n col or sel ect ed by Ar chi t ect .

1. Ver t i cal Uni t , Exposed Fr ont Panel s: Mi ni mum 0. 0528- i nch t hi ck, gal vani zed, sheet st eel , r emovabl e panel s wi t h channel - f or med edges secur ed wi t h t amper pr oof cam f ast ener s.

2. Hor i zont al Uni t , Exposed Bot t om Panel s: Mi ni mum 0. 0528- i nch t hi ck, gal vani zed, sheet st eel , r emovabl e panel s secur ed wi t h t amper pr oof cam f ast ener s and saf et y chai n.

3. Recessi ng Fl anges: St eel , f i ni shed t o mat ch cabi net .

4. Cont r ol Access Door : Key oper at ed.

SECTI ON 23 52 00 Page 15 jmitchell Highlight

5. Base: Mi ni mum 0. 0528- i nch t hi ck st eel , f i ni shed t o mat ch cabi net , 4 i nches hi gh wi t h l evel i ng bol t s .

6. Ext ended Pi pi ng Compar t ment : 8- i nch wi de pi pi ng end pocket .

7. Fal se Back: Mi ni mum 0. 0428- i nch t hi ck st eel , f i ni shed t o mat ch cabinet.

d. Fi l t er s: Mi ni mum ar r est ance accor di ng t o ASHRAE 52. 1 and a mi ni mum ef f i c i ency r epor t i ng val ue ( MERV) accor di ng t o ASHRAE 52. 2.

1. Gl ass Fi ber Tr eat ed wi t h Adhesi ve: 80 per cent ar r est ance and MERV 7.

e. Hot - Wat er Coi l : Copper t ube, wi t h mechani cal l y bonded al umi num f i ns spaced no c l oser t han 0. 1 i nch and r at ed f or a mi ni mum wor ki ng pr essur e of 200 psi g and a maxi mum ent er i ng- wat er t emper at ur e of 220 degr ees F.

I ncl ude manual ai r vent and dr ai n.

f . Fan and Mot or Boar d: Removabl e.

1. Fan: For war d cur ved, hi gh st at i c, doubl e wi dt h, cent r i f ugal ;

di r ect l y connect ed t o mot or . Ther mopl ast i c or pai nt ed- st eel wheel s, and al umi num, pai nt ed- st eel , or gal vani zed- st eel f an scrolls.

2. Mot or : Per manent l y l ubr i cat ed mul t i speed; r es i l i ent l y mount ed on mot or boar d. Compl y wi t h r equi r ement s i n Di v i s i on 23.

3. Wi r i ng Ter mi nat i ons: Connect mot or t o chassi s wi r i ng wi t h pl ug connection.

g. El ect r i cal Connect i on: Fact or y wi r e mot or s and cont r ol s f or a s i ngl e f i el d connect i on.

1. Di sconnect swi t ch.

2. Mot or speed cont r ol l er .

2. 12. 2 Pr opel l er Uni t Heat er s

a. Descr i pt i on: An assembl y i nc l udi ng casi ng, coi l , f an, and mot or i n ver t i cal or hor i zont al di schar ge conf i gur at i on wi t h adj ust abl e di schar ge l ouver s.

b. El ect r i c uni t heat er s shal l compl y wi t h UL 2021.

c. Cabi net : Removabl e panel s f or mai nt enance access t o cont r ol s.

d. Cabi net Fi ni sh: Manuf act ur er ' s st andar d baked enamel appl i ed t o f act or y- assembl ed and - t est ed pr opel l er uni t heat er bef or e shi ppi ng.

e. Di schar ge Louver : Adj ust abl e f i n di f f user f or hor i zont al uni t s and coni cal di f f user f or ver t i cal uni t s.

f . El ect r i c- Resi st ance Heat i ng El ement s: Ni ckel - chr omi um heat i ng wi r e, f r ee f r om expansi on noi se and 60- Hz hum, embedded i n magnesi um oxi de r ef r act or y and seal ed i n st eel or cor r osi on- r esi st ant met al l i c sheat h

SECTI ON 23 52 00 Page 16 wi t h f i ns no c l oser t han 0. 16 i nch. El ement ends shal l be encl osed i n t er mi nal box. Fi n sur f ace t emper at ur e shal l not exceed 550 degr ees F at any poi nt dur i ng nor mal oper at i on.

1. Ci r cui t Pr ot ect i on: One- t i me f uses i n t er mi nal box f or over cur r ent pr ot ect i on and l i mi t cont r ol s f or hi gh- t emper at ur e pr ot ect i on of heat er s.

2. Wi r i ng Ter mi nat i ons: St ai nl ess- st eel or cor r osi on- r esi st ant material.

g. Fan: Pr opel l er t ype wi t h al umi num wheel di r ect l y mount ed on mot or shaf t i n t he f an vent ur i .

h. Fan Mot or s shal l be per manent l y l ubr i cat ed, mul t i speed.

2. 13 FI NNED TUBE RADI ATORS

Pr ovi de st eel doubl e panel r adi at or s of t he l engt hs and i n l ocat i ons as i ndi cat ed, and of capaci t i es, st y l e and havi ng accessor i es as schedul ed.

The doubl e heat i ng panel r adi at i on shal l be of one- pi ece al l - wel ded st eel const r uct i on, consi st i ng of a pai r of f l at t ened wat er t ube panel s wel ded t o header s at each end. Wel ded t o t he i nsi de of each panel shal l be st eel cor r ugat ed f i ns t o i ncr ease t he convect i ve out put of t he r adi at or . The f i ns shal l s t ar t at no l ess t han 3 i nches f r om t he end of t he r adi at or , and shal l have no l ess t han 32 f i ns per f oot . The r adi at or s shal l i ncl ude an i nt egr al heavy gauge ( 0. 09 i nch mi ni mum) al l - wel ded per f or at ed t op gr i l l e, whi ch wi l l cover t he t op of al l of t he f i nned ar eas.

The header s shal l i ncl ude al l necessar y i nl et , out l et and vent connect i ons as r equi r ed. St andar d connect i on s i zes ar e 1/ 2 i nch NPT t aper ed t hr ead f or suppl y and r et ur n pi pi ng, and 1/ 8 i nch f or t he vent connect i on. I nt er nal baf f l i ng i s pr ovi ded wher e r equi r ed f or pr oper wat er f l ow.

The r adi ant heat i ng panel s shal l be avai l abl e i n l engt hs f r om 2 f eet , 0 i nches t o 29 f eet , 6 i nches i n t wo- i nch even i ncr ement s wi t hout t he need f or spl i c i ng. The panel r adi at i on shal l be capabl e of bei ng mount ed t o t ypi cal st ud wal l const r uct i on wi t hout addi t i onal bl ocki ng or st r appi ng.

Appr opr i at e wal l mount i ng br acket s shal l be pr ovi ded wi t h t he r adi at i on.

The doubl e panel r adi at or s ar e t o be pr ovi ded wi t h f l oor - mount ed pedest al s.

Pr essur e r at i ngs f or t he r adi at i on shal l be as f ol l ows:

a. St andar d: Wor ki ng pr essur e 56 psi maxi mum. Test Pr essur e: 74 psi maximum.

The panel r adi at i on shal l be c l eaned and phosphat i zed i n pr epar at i on f or t he powder coat f i ni sh. The r adi at i on i s t hen f i ni sh pai nt ed wi t h a gl oss powder coat f i ni sh, f or a t ot al pai nt t hi ckness of 2- 3 mi l s ( 0. 002 i nch t o

0. 003 i nch) . Pr ovi de cust om col or .

2. 14 HEATI NG AND VENTI LATI NG UNI TS

Heat i ng and vent i l at i ng uni t s and associ at ed equi pment shal l be i n accor dance wi t h Sect i on 23 00 00 AI R SUPPLY, DI STRI BUTI ON, VENTI LATI ON, AND

EXHAUST SYSTEM.

SECTI ON 23 52 00 Page 17

2. 15 AI R HANDLI NG UNI TS

Ai r handl i ng uni t s and associ at ed equi pment shal l be i n accor dance wi t h Sect i on 23 00 00 AI R SUPPLY, DI STRI BUTI ON, VENTI LATI ON, AND EXHAUST SYSTEM.

2. 16 FI TTI NGS AND ACCESSORI ES

Boi l er f i t t i ngs and accessor i es shal l be i nst al l ed wi t h each boi l er i n accor dance wi t h ASME BPVC SEC I V, unl ess ot her wi se speci f i ed.

2. 16. 1 Convent i onal Br eechi ng and St acks

2. 16. 1. 1 Stacks

Pr ef abr i cat ed doubl e wal l st acks syst em shal l ext end above t he r oof t o t he hei ght i ndi cat ed. The i nner st ack shal l be 304 st ai nl ess st eel havi ng a t hi ckness of not l ess t han 0. 035 i nch. The out er st ack shal l be sheet st eel havi ng a t hi ckness of not l ess t han 0. 025 i nch. A met hod of mai nt ai ni ng concent r i c i t y bet ween t he i nner and out er st acks shal l be i ncor por at ed. The j oi nt s bet ween t he st ack sect i ons shal l be seal ed t o pr event f l ue gas l eakage. A 0. 3125 i nch di amet er hol e shal l be pr ovi ded i n t he st ack not gr eat er t han 6 i nches f r om t he f ur nace f l ue out l et f or sampl i ng of t he exi t gases. A met hod shal l be pr ovi ded t o seal t he hol e t o pr event exhaust gases f r om ent er i ng t he boi l er r oom when sampl es ar e not bei ng t aken. Each st ack shal l be pr ovi ded compl et e wi t h r ai n hood.

Pl ast i c mat er i al s pol yet her i mi de ( PEI ) and pol yet her sul f one ( PES) ar e f or bi dden t o be used f or vent pi pi ng of combust i on gases.

2. 16. 2 Di r ect Vent s

Di r ect vent i ng shal l be used f or condensi ng t ype boi l er s. Bot h t he ai r i nt ake and exhaust vent s shal l be s i zed and l ocat ed as i ndi cat ed on t he dr awi ngs and as r ecommended by t he boi l er manuf act ur er . A separ at e combust i on ai r i nt ake vent and exhaust vent shal l be pr ovi ded f or each boiler.

2. 16. 2. 1 Combust i on Ai r I nt ake Vent

The combust i on ai r i nt ake pi pi ng shal l be const r uct ed of Schedul e 40 PVC i n accor dance wi t h ASTM D1784. The vent shal l be sui t abl e f or t he t emper at ur e at t he boi l er combust i on ai r i nt ake connect i on poi nt . Each i nt ake shal l be pr ovi ded compl et e wi t h bi r d scr een.

2. 16. 2. 2 Exhaust Vent

The exhaust vent pi pi ng shal l be const r uct ed of Schedul e 40 CPVC or st ai nl ess st eel conf or mi ng t o UL 1738 and t he boi l er manuf act ur er ' s r ecommendat i ons.