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

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ELECTRI C DUCT 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 duct heat er s consi st i ng 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 duct heat er s i ncl udi ng use l i f e, syst em f unct i onal f l ows, saf et y f eat ur es, and mechani cal aut omat ed det ai l s.

c. Submi t manuf act ur er ' s i nst r uct i ons f or duct heat er s i ncl udi ng i nst al l at i on dr awi ngs showi ng any 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. Cl ear l y not e i mpedances, hazar ds and saf et y pr ecaut i ons.

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

I nst al l at i on Dr awi ngs; G

SD- 03 Pr oduct Dat a

Equi pment and Per f or mance Dat a; G

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Duct Heat er s; G

Heat i ng El ement s; G

Encl osur es; G

Cont r ol 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 duct heat er s wi t h t he capaci t y i ndi cat ed, pl us or mi nus 5 per cent . Ensur e duct 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.

2. 1. 1 Per f or mance Requi r ement s

Pr ovi de duct heat er s conf or mi ng t o t he r equi r ement s of UL 1996.

2. 2 COMPONENTS

2. 2. 1 Heat i ng El ement s And Encl osur es

I nst al l heat i ng el ement s wi t h a f r amewor k compl et e wi t h t er mi nal , and const r uct j unct i on boxes of mi l l - al umi ni zed or gal vani zed car bon st eel .

Pr ovi de wi t h a magnet i c cont act or i n a separ at e encl osur e i nsul at ed f r om t he duct at duct heat er l ocat i on or at a separ at e, r emot e l ocat i on.

Ensur e al l gasket i ng i s 1/ 16- i nch t hi ck non- asbest os woven- cl ot h t ape, wi t h f l ange dept h sui t abl e f or duct i nsul at i on pr ovi ded. I nsul at e t er mi nal j unct i on box t o pr event el evat ed t emper at ur es.

Pr ovi de open heat i ng- el ement consi st i ng of a hel i x- wound r esi st ance wi r e al l oy appr oxi mat el y 80 per cent ni ckel and 20 per cent chr omi um. Wat t age densi t y i s not t o exceed 50 wat t s per l i near i nch of heat ed el ement .

Ensur e el ement suppor t mi ni mi zes abr asi on and saggi ng. Pr ovi de saf et y scr eens on bot h upst r eam and downst r eam si des of heat er el ement s.

Pr ovi de dummy el ement s or i ncl ude ot her pr ovi s i ons s i mi l ar t o open ar ea per f or at ed scr eens i f r equi r ed t o uni f or ml y di st r i but e ai r f l ow acr oss heat er f ace.

2. 2. 2 Controls

Pr ovi de uni t s wi t h i nt egr al over heat cut out s f or pr i mar y and secondar y pr ot ect i on, wi t h aut omat i c- r eset pr i mar y cut out of t he di sk t ype and sui t abl e f or 277- vol t , 60- her t z ser vi ce.

Pr ovi de di sk t ype manual - r eset secondar y cut out s wi r ed i n ser i es wi t h each circuit.

Pr ovi de i ndi cat i ng l i ght ( s) t o show:

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a. Heat er on

b. Each ci r cui t on

Local l y pr ovi de pi l ot swi t ch t o cut of f heat er t hr ough i nt egr al magnet i c contactors.

For heat er assembl i es r at ed at 45 amper es and l ar ger , pr ovi de t he heat er assembl y subdi v i ded and f used. Fuse each subdi v i ded 45- amper e heat er l oad sect i on. I n c i r cui t s of l ess t han 45 amper es, f use appr opr i at e sect i ons.

Pr ovi de UL- appr oved magnet i c cont act or s, ( ot her t han i nt egr al over heat - cut out associ at ed uni t s) , r emot el y l ocat ed as i ndi cat ed.

Pr ovi de st ep cont r ol l er s f or sequenci ng heat er l oads of UL- appr oved component s and i ncl ude t he f ol l owi ng:

a. Del ay t o pr event l i ne sur ge when ener gi z i ng l oads

b. I ndi v i dual f usi ng of each st ep

c. I nt er component wi r i ng t o t er mi nal s f or f i el d connect i on cabi net

Pr ovi de st age t ype wal l mount ed t her most at s.

Pr ovi de 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. Ensur e r ange i s bet ween 55 and 105 degr ees F, wi t h di f f er ent i al not t o exceed 1. 5 degr ees F, r at ed f or oper at i on at 24 vol t s, 60 her t z. Pr ovi de any necessar y t r ansf or mer s, wi r i ng, and devi ces t o meet t hi s r equi r ement . Fi ni sh cases i n br ushed or sat i n chr ome.

Pr ovi de cont r ol of power t o uni t by a UL- l i s t ed sol i d- st at e s i l i con- cont r ol l ed r ect i f i er ( SCR) syst em such t hat vol t age i s cont i nuousl y i mpr essed and var i ed i n mi nut e i ncr ement s over a r ange of zer o t o r at ed vol t age or t o 105 per cent of r at ed vol t age maxi mum.

PART 3 EXECUTI ON

3. 1 INSTALLATION

I nst al l duct heat er s i n accor dance wi t h t he manuf act ur er ' s i nst r uct i ons and l ocat e duct heat er s t o per mi t access t o t he heat er af t er i nst al l at i on.

I nst al l t emper at ur e pr obe r out ed t o t he bui l di ng cont r ol l er i ndi cat i ng when t he uni t i s i n heat i ng mode.

For duct heat er s i nsi de a VAV, di spl ay f an st at us at t he bui l di ng controller.

3. 2 FI ELD QUALI TY CONTROL

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

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

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Cycl e duct 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.

- - End of Sect i on - -

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