BAC 3872C User Manual

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13
Detailed Component
Maintenance
Procedures
Fan Drive System
BALTIDRIVE
®
Power Train/
BALTIGUARD™ and
BALTIGUARD PLUS™ Fan
System
Optional Gear Drive System
Optional Gear Drive System
Initial Start-Up
• Iftheunitisequippedwithanextendedlubricationlineoptionorexternalsightglass,
makesuretheballvalvelocatedatthegearboxisopenpriortostart-up.
• BACshipsallgeardriveslledwithoil.Theinitialoillevelshouldbeatornearthe
middleoftheoillevelsightgauge.
• Internallymountedgeardrivesarefactoryinstalled,aligned,andtightened.Double
checkallgeardrivefastenersaftertheunithasbeeninstalled.
• Onunitswithexternallymountedmotors,installandalignthemotoranddriveshaft
inaccordancewithBAC’sinstallationinstructions.Recheckthealignmentandall
externalfastenersaftertwoweeksofoperation.
• Oninstallationswithvariablefrequencydrives,donotoperatethestandardgeardrives
below450RPMmotorspeed(gearinputspeed).Forspeedslessthan450RPM,a
lowspeedoptiongeardrivemustbesupplied.
• Priortothestart-up,checkallttingsonthegeardrivetoensurethatthereareno
visibleleaks.RefertoFigure 5 forlocationsofthegeardrivettings.
Change Interval
• Initial oil change:Replacetheoriginaloilafter500hoursorfourweeksofoperation,
whichevercomesrst.
• Aftertheinitialoilchange,changetheoilevery2,500hoursorsixmonths,whichever
comesrst.
• Draintheoilatoperatingtemperaturethroughthedrainplug.
• Rellthegeardrivethroughtheoilllelbowwiththerecommendedtypeandamount
oflubricant(Table 3, page 15).RefertoFigure 5forlocationsofthesecomponents.
Inspection & Maintenance
• Maintaintheoillevelatornearthemiddleoftheoillevelsightgauge.Theoillevel
shouldalwaysbevisibleinthesightgaugewindowwhentheunitisnotoperating/
energized,andtheoilisatambienttemperature.
• Checkoillevelweeklywiththeunitidle.Onunitssuppliedwithanexternalsight
gauge,checktheoilleveloftheexternalsightgaugeandthesightgaugeonthegear
drivetoensurethattheproperamountofoilisinthegeardrive.
• Addoilthroughtheoilllelbowiflevelisbelowtheoillevelsightgauge.
• Thestandardoilprovidedismineraloil.Syntheticlubricantsarealsoavailableasan
option(seeFanDriveSystem“Lubrication”onPage 15).
ATTENTION: Gear drives should
not be used with Wye-Delta (Y-)
motors.
Air Breather Plug
Oil Level
Sight Gauge
Oil Drain Plug
Oil Fill Elbow
Name Plate
Figure 5. Gear Drive
NOTE: Continued operation at a
speed which resonates with the
gear drive system may result in
torsional vibrations which can
damage system components. The
most common indicator of torsional
vibration is an unusual rumbling or
grinding noise from the gear drive
at a narrow speed range. The noise
will decrease to normal levels when
the speed is increased or decreased
away from the offending speed
range. This noise is not indicative
of a defect, but results when the
vibratory torque exceeds the drive
torque, causing the gear teeth to
separate and clash together very
rapidly. On variable frequency
applications, avoid operation near
this resonance speed by locking out
the resonance speed range.

BAC 3872C Specifications

General

Brand	BAC
Model	3872C
Category	Air Conditioner
Language	English