Trane QFNA-IOM-1 Fan User Manual


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InstallationofMotorand
BeltguardWhenNOT
FactoryInstalled
Arrangements1and9
Removethedischargecone
coveringthefanshaft.Checkthe
sheaveboreforburrsand
lubricateforeasiermounting.Do
notuseexcessiveforcewhen
mountingsheaves,asthismay
damagethebearings.Besurethe
fanandmotorshaftsareparallel.
SeeFigure9.
Setthemotorsheavewitha1/2"
spacebetweenblock-offretainer
andbackofsheaveasshownin
Figure6.Alignthesheaveswitha
straightedgeasinFigure9and
tightenthesetscrews.Whenthe
sheavesarenotthesamewidth,
placeastringinthecentergroove
ofbothsheavesandpulltight.The
stringshouldgostraightthrough
thecenterofbothgrooves.
Movethemotorinasclosetothe
fanshaftcenterlineasthe
adjustingangleswillpermit.
Slipthebeltsoverthesheaves
withoutforcingthem.Forcingthe
beltsmaycausedamage.
Tightenthebeltsslightlyand
manuallyrotatethedriveseveral
times.Asacheck,onmultiplebelt
drives,determinethattheforceof
deflectionisapproximatelythe
samebypushingeachbeltinan
equaldistanceatapointhalfway
betweenthesheaves.
Afterrealignment,tightenthebelts
toareasonabletension.Operate
theunitafewminutestoallow
beltstoseat(SeeStart-Up).Belts
shouldnotslipwhenrunning,but
aslightsquealatstartupis
normal. Donotover-tensionbelts.
Belttensionshouldberechecked
aftereighthoursofoperationand
monthlythereafter.Whenthebelt
isinoperation,thetightsideofthe
beltshouldformastraightline
fromsheavetosheavewithonlya
slightbowontheslackside.
Attachthefrontsideofthebelt
guardtotherearpanelassembly
alreadyinplaceontheunitusing
clipsorscrewsprovided.Keepthe
polyurethanegasketinposition
duringthisoperation.
Replacetheendconeusingthe
screwsand/orclipsoriginally
used.Besurebeltsdonotscrape
theedgeofthecutoutintheend
conewhentheunitisinoperation
Installation—QFan
14 FNA-IOM-1
Figure9—AligningSheavesWithAStraightEdge
ForSheavesOfTheSame
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