WheelAlignment
Arrangements1and9
Manuallyrotatethefanwheeltobe
surethatitturnsfreely.Thetip
clearancesaresetinthefactoryand
normallydonotrequirereadjustment.
todetermineifadjustmentis
required,measureandrecordthe
clearancesbetweenwheeland
housingatsixequallyspaced
intervalsaroundtheinsideofthefan
housing.Clearancesshouldbe
measuredattheleadingandlagging
edgeofthebladetip.Ifadjustmentis
necessaryloosenthefrontbearing
boltsandreadjustbearinglocation.
SeeFigure10.Onsizes16through
44,additionaladjustmentcanbe
obtainedbylooseningfrombearing
bracketandreadjustingposition.
Retightenallfastenersandtorque
perTables4and5.
TipclearancesaregiveninTable3
andbolttorquesinTable4and5.
Checkthespacingbetweentherear
edgeofthefanwheelanddiffuser
cylinder.Ifthisspacingisnotas
showninFigure11,movethefan
wheelontheshaftforproper
measurement.Toachievethis,
loosenthesetscrew(s)andmovethe
fanwheeloutsufficientlytoinserttwo
piecesofthecorrectthicknessbar
stock,oneateachsideofthewheel.
Movewheelgentlyagainstbarstock
pieces.Tightensetscrewandremove
barstockpieces.SeeFigure11.
Installation—QFan
QFNA-IOM-1 15
Figure11—ClearanceFanWheelDiffuser
Figure10—FrontBearingBracket