BAC 3872C User Manual

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11
Detailed Component
Maintenance
Procedures
Cold Water Basin
Inspection & Maintenance
Fan
Inspection & Maintenance
Fan Drive System
BALTIDRIVE
®
Power Train/
BALTIGUARD™ and
BALTIGUARD PLUS™ Fan System
• Tip Clearance:Checktheclearancebetweenthetipofthebladeandthefancowl.The
clearanceshouldbesufcienttopreventthefanbladesfromcontactingthefancowl
duringoperation.ContactyourlocalBACRepresentativeifthereareanyconcerns.
• Drain Holes:Onhollowblades,thedrainholeinthebladetipshouldbeunobstructed.
Tip:Useapieceofwiretoprobethedrainhole.
• Blade Pitch:Checktoensurethatthebladesareallatthesamepitch.Ifuncertain,
measurethepitchwithaninclinometer.Allbladesshouldbewithin1/2°ofeach
other.
• Rotation: Turnthefanbyhandtoensurethatitmovesfreelywithnoroughspots,
binding,orothermalfunctionsthatcouldcausevibrationorfanmotoroverload.While
rotatingthefan,checkthebladetracking.Allbladesshouldtrackwithina1”bandat
anysinglepointaroundthecowl.
• Direction of Rotation: Oninitialstart-up,orifthefanmotorhasbeenrewired,briey
energizethefanmotorandnotethedirectionoffanrotation.Itshouldrotateinthe
directionindicatedbythearrowonthefancowl.
• Operation:Oninitialstart-up,runthefaninthemanualpositionforseveralminutes,
andcheckforanyunusualnoisesorvibration.
Fan Drive System
BALTIDRIVE
®
Power Train/BALTIGUARD™ and BALTIGUARD PLUS™
Fan System
TheBALTIDRIVE
®
PowerTrainconsistsofasolid-
backed,multi-groove,neoprene/polyesterbeltrated
forcoolingtowerservice,andcorrosion-resistant
sheaves.Thesecomponentsprovidehighreliability
withlowmaintenancerequirements.
TheBALTIGUARD™FanSystemconsistsof
twostandardsingle-speedfanmotorsanddrive
assemblies.Onedriveassemblyissizedforfullspeed
andload,andtheotherissizedforapproximately2/3
speedandconsumesonly1/3thedesignhorsepower.

TheBALTIGUARDPLUS™FanSystembuildsontheadvantagesoftheBALTIGUARD™
FanSystembyaddingaVFDtooneofthemotors.
Inspection & Maintenance
Thesedrivesrequireaperiodiccheckofthebeltconditionand,whennecessary,tension
adjustment.Therecommendedserviceintervalsareasfollows:
• Initial Start-Up:Thedrivehasbeentensionedandalignedatthefactory;however,prior
toinitialstartup,checkbelttension.
• Seasonal Start-Up: Readjustthebelttension(ifrequired).
• Operation:Aftertherst24hoursofoperation,readjustthebelttensiononanewunit
start-uporinstallationofanewbelt.Thereafter,checkthebeltconditionmonthly,and
adjusttensionasnecessary.Readjusttensionatleastonceeverythreemonths.
Figure 2. BALTIGUARD™ Fan System
ATTENTION: Check to ensure the
controls for the fan motor are set
to allow a maximum of six on-off
cycles per hour to prevent motor
overload.

BAC 3872C Specifications

General

Brand	BAC
Model	3872C
Category	Air Conditioner
Language	English