Ti nker AFB, OK TAFB Techni cal Spr ci f i cat i ons 2019

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ELECTRI C UNI T HEATERS

04/17

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.

UNDERWRI TERS LABORATORI ES ( UL)

UL 1996 ( 2009; Repr i nt Jul 2016) UL St andar d f or Saf et y El ect r i c Duct Heat er s

1. 2 ADMI NI STRATI VE REQUI REMENTS

Sect i on 26 00 00. 00 20 BASI C ELECTRI CAL MATERI ALS AND METHODS appl i es t o wor k speci f i ed i n t hi s sect i on.

1. 2. 1 Pr e- I nst al l at i on Meet i ngs

The Cont r act i ng Of f i cer wi l l schedul e a pr e- i nst al l at i on meet i ng wi t hi n 30 days of Cont r act Awar d. Pr ovi de t he f ol l owi ng f or r evi ew and appr oval :

a. Submi t f abr i cat i on dr awi ngs f or el ect r i c heat er s i ndi cat i ng t he of f abr i cat i on and assembl y det ai l s t o be per f or med i n t he f act or y.

b. Submi t equi pment and per f or mance dat a f or el ect r i c heat er s l i f e, t est , syst em f unct i onal f l ows, saf et y f eat ur es, and mechani cal aut omat ed details.

c. Submi t manuf act ur er ' s i nst r uct i ons f or el ect r i c heat er s st at i ng t he speci al pr ovi s i ons r equi r ed t o i nst al l equi pment component s and syst em packages. Det ai l i mpedances, hazar ds and saf et y pr ecaut i ons wi t hi n t he speci al not i ces.

1. 3 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 Cont r act or Qual i t y Cont r ol appr oval and i nf or mat i on onl y 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

Fabr i cat i on Dr awi ngs; G

SD- 03 Pr oduct Dat a

Equi pment and Per f or mance Dat a; G

El ect r i c Uni t Heat er s; G

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Heat i ng El ement ; G

Cont r ol s; G

Casi ngs; G

Pr opel l er s and Mot or s; G

SD- 08 Manuf act ur er ' s I nst r uct i ons

Manuf act ur er ' s I nst r uct i ons; G

PART 2 PRODUCTS

2. 1 SYSTEM DESCRI PTI ON

Pr ovi de suspended el ect r i c uni t heat er s and ar r ange f or di schar ge of ai r as i ndi cat ed.

Pr ovi de el ect r i c uni t heat er s wi t h not l ess t han t he i ndi cat ed capaci t y and conf or m t o r equi r ement s speci f i ed her ei n. Ensur e el ect r i c uni t heat er s ar e f act or y pr ewi r ed, r eady f or f i el d t er mi nal connect i ons.

Ensur e pr oduct s conf or m t o t he r equi r ement s of UL 1996 f or el ect r i c uni t heaters.

2. 2 COMPONENTS

2. 2. 1 Heat i ng El ement

Const r uct heat i ng el ement of a r esi st ance wi r e i nsul at ed by hi ghl y compact ed r ef r act or y i nsul at i on pr ot ect ed by a seal ed met al l i c- f i nned sheat h. Component mat er i al s ar e as f ol l ows:

a. Pr ovi de r esi st ance wi r e not l ess t han 20- hel i x wound al l oy appr oxi mat el y 80- per cent ni ckel and 20- per cent chr omi um.

b. Pr ovi de r ef r act or y i nsul at i on of magnesi um oxi de wi t h a r esi st ance of not l ess t han 50, 000- ohms af t er exposur e t o an ambi ent t emper at ur e and humi di t y of 90 degr ees F and 85 pl us or mi nus 5- per cent r el at i ve humi di t y, r espect i vel y, f or not l ess t han 24 hour s.

c. Pr ovi de sheat hi ng consi st i ng of al umi num f i ns cast ar ound an i nt er nal st eel sheat h cont ai ni ng r ef r act or y i nsul at i on and r esi st ance wi r e or car bon- st eel f i ns per manent l y at t ached t o a t ubul ar car bon- st eel sheat h cont ai ni ng r ef r act or y i nsul at i on and r esi st ance wi r e and wi t h ext er nal sur f aces por cel ai ni zed.

Ensur e maxi mum sur f ace t emper at ur e of por cel ai n- pr ot ect ed st eel sheat hi ng i s 700 degr ees F.

2. 2. 2 Controls

Pr ovi de uni t wi t h a r emot e unf used di sconnect swi t ch t hat opens ungr ounded conduct or s i n t he OFF posi t i on and a t her most at wi t h i nt egr al cont r ol s i ncl udi ng t her mal over l oad cut out swi t ches, magnet i c cont act or s, necessar y t r ansf or mer s, and t her most at pr ot ect i on as r equi r ed. Pr ovi de cut out swi t ches t hat can be aut omat i cal l y r eset .

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Pr ovi de wal l - mount ed t her most at s compl et e wi t h t her momet er , mechani cal hi gh- l i mi t st op, cal i br at ed oper at or , and an adj ust abl e heat er t o ef f ect ant i c i pat i on and t o pr event over r i de of space t emper at ur e wi t h a r ange bet ween 55 and 105 degr ees F and a di f f er ent i al not exceedi ng 1. 5 degr ees F.

Pr ovi de t her most at r at ed f or oper at i on at 24 vol t s, 60 her t z. Pr ovi de t r ansf or mer s, wi r i ng, and devi ces necessar y t o meet t hi s r equi r ement .

Fi ni sh cases i n br ushed or sat i n chr ome.

2. 2. 3 Pr opel l er s and Mot or s

Pr ovi de pr opel l er s wi t h al l - al umi num bl ades st at i cal l y and dynami cal l y bal anced t o wi t hi n 0. 5 per cent . Pr ovi de uni t s wi t h f an- i nl et saf et y guards.

AMCA cer t i f y pr opel l er s and mot or s f or ai r per f or mance and noi se l evel .

Pr ot ect mot or s agai nst damage by t he heat i ng el ement and r esi l i ent mount .

Conf or m t o Sect i on 26 60 13. 00 40 LOW- VOLTAGE MOTORS f or mot or s, except t hat l oad- mat ched and cust om- desi gned mot or s may be used and be so i dent i f i ed on t he shop dr awi ngs. For mot or s not so i dent i f i ed conf or m t o t he r equi r ement s speci f i ed.

Subf r act i onal and f r act i onal cust om- desi gned or appl i ed mot or s may devi at e f r om t he pr ecedi ng mot or r equi r ement s as f ol l ows:

a. Shaded- pol e mot or s r at ed l ess t han 1/ 6- hor sepower may be used f or di r ect - dr i ve ser vi ce.

b. Per manent spl i t - capaci t or , spl i t - phase, and capaci t or - st ar t mot or s r at ed 1/ 4- hor sepower and l ess may be used f or di r ect - dr i ve ser vi ce.

c. Spl i t - phase and capaci t or - st ar t mot or s, r at ed 1/ 4- hor sepower and l ess, may be used f or bel t - dr i ve ser vi ce.

d. Mot or bear i ngs may be manuf act ur er ' s st andar d pr el ubr i cat ed sl eeve t ype except pr ovi de mot or wi t h ant i f r i c t i on t hr ust bear i ngs, when speci f i ed. Ensur e l ubr i cant pr ovi s i ons ar e ext ended ser vi ce t ype, r equi r i ng r epl eni shment not mor e t han t wi ce per year of cont i nuous operation.

Pr ovi de mot or i dent i f i cat i on pl at e per manuf act ur er ' s st andar d.

Pr ovi de mot or speed and cont r ol per uni t - heat er manuf act ur er ' s st andar d.

PART 3 EXECUTI ON

3. 1 INSTALLATION

I nst al l uni t heat er s i n accor dance wi t h t he manuf act ur er ' s i nst r uct i ons at t he mount i ng hei ght s i ndi cat ed.

3. 1. 1 Casings

Pr ovi de casi ngs wi t h smoot hl y cont our ed pr opel l er or i f i ce r i ngs of not l ess t han 20- gage col d- r ol l ed car bon st eel . Pr ovi de casi ng sur f ace f i ni sh wi t h phosphat e pr et r eat ment , pr i me coat i ng, and baked- enamel f i ni sh.

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3. 1. 2 Ai r Di st r i but i on

Pr ovi de hor i zont al uni t s wi t h adj ust abl e s i ngl e- or doubl e- def l ect i on louvers.

3. 2 FI ELD QUALI TY CONTROL

Demonst r at e i n t he pr esence of t he Cont r act i ng Of f i cer t hat t he uni t heat er s oper at e sat i sf act or i l y .

Cycl e uni t heat er s f i ve t i mes, f r om st ar t t o oper at i ng t her mal condi t i ons t o of f , t o ver i f y adequacy of const r uct i on, syst em cont r ol s, and component performance.

Conduct an oper at i onal t est f or a mi ni mum of 6 hour s.

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