BAC 3872C User Manual

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• RefertoTable 3 on Page 15fornormaloperatingoilcapacityofeachgeardrive.
• RefertoTable 4or5onPage 16orthegeardrivenameplateforspecicgearmodel
numberforeachunit.
• Quarterlychecktoensureproperalignmentofallsystemcomponents.
• Checktoensurethatallboltsandexternalfastenersaretight.
• BACrecommendsdailyvisualinspectionsandobservationforoilleaksandunusual
noisesandvibrations.Ifanyoftheseoccur,shutdowntheunituntilthecauseisfound
andcorrected.
• Ifequippedwithanexternaloillineandsitegauge,checkweeklytomakesurethe
breatherholeatthetopofthesightgaugeisopen.
Routine Maintenance During Operation
• Periodicallyrecheckthealignmentandtightenexternalfastenersasnecessary.No
specialbreak-inproceduresarerequired.
• Excessivenoiseorvibrationatinitialoperationisanindicationofoneormoreofthe
following:
– Misalignment
– Imbalanceofthefanorotherrotatingparts
– Improperlyadjustedfanblades
– Operationatthemechanicalequipmentresonantfrequency
• Forgearsequippedwiththelowspeedoption,operatethefanmotoratfullspeedfor
atleastveminutesweeklytosupplyoiltotheupperbearingreservoirinsidethegear
casing.
• Duringperiodsofinactivity,thelubricantdoesnotconstantlylubricatetheinternal
partsofthegeardrive,leavingthegeardrivesusceptibletocorrosion.Therefore,the
followingspecialprecautionsarenecessaryduringperiodsofinactivity:
– Forbestresults,letthegeardrivecoolforapproximately4hoursaftershutdown.
– Startthefanandletitrunforapproximately5minutes.Thiswillcoattheinternal
partsofthedrivewithcooloil.
– Thereafter,runthefanfor5minutesonceaweek,throughouttheshutdownperiod
tomaintaintheoillmontheinternalpartsofthegeardrive.
• Cleantheoutsideofthegeardriveatleastquarterly.
Prolonged Shutdown
Followtheproceduresbelowwhenageardrivewillnotbeusedforaprolongedperiodof
time,includingseasonalshutdown.
• Drainalloftheoldoilfromthegeardriveandproperlydiscard.
• Re-installdrainplug.
• Removetheairbreatherfromthegeardrive.
• Completelyllthegeardrivethroughtheairbreatherportwitharecommended
lubricantlistedon page 15.Oncethegearislled,donotusethefanmotortorotate
thegearaspressurewillbuildupinthegearboxandcausedamage.
• Aftercompletelyllingthegearwithoil,plugthepreviouslyremovedairbreatherport,
andallremainingopenports.Usesteelplugstoplugtheopenings,andstoretheair
breathersothatyoucanreuseitwhenthegeardriveisputbackinoperation.
• Securelyattacha“warning”tagtothegearboxandmotorstarterstatingthatithas
been“overlled”toremindstart-uppersonnelthattheyneedtodrainthegearoilback
totheproperlevelbeforeusing.
• Toestablishamoisturebarrier,coverthedrivewithatarpaulinorotherprotectivecover.
• Forstart-upafterprolongedshutdown,thegearboxmustbefullydrained,thenrelled
withnewoilatornearthemiddleoftheoillevelsightgaugetopreventdamage.
Re-installtheairbreatherwhichwasremovedpriortotheprolongedshutdown.Then,
followthestepsin“InitialStart-up”onpage 13.
ATTENTION: If noise or vibration
persists, shut the unit down and
correct the cause before continuing
operation.
ATTENTION: When reversing the
direction of rotation, allow the fan
to come to a complete stop before
restarting the motor.
ATTENTION: For installations with
2-speed motors when slowing
from high speed, allow a minimum
15-second time delay for the fan
to slow down before energizing the
low-speed winding.
ATTENTION: Upon start-up, the
gear box must be drained back to
the proper level before operation
to prevent damage. The fan motor
should be locked and tagged out in
order to prevent operation until the
oil level is returned to normal.

BAC 3872C Specifications

General

Brand	BAC
Model	3872C
Category	Air Conditioner
Language	English