Twin City Fans With CE Mark - ES-2-06 - Manual (Page 10)

10. Twin.City.Fan.Engineering.Supplement.2-06
Drive Maintenance
V-belt.drives.need.periodic.inspection,.re-tensioning,.and.
occasional.belt.replacement..Follow.Table.5.on.page.11.
for.drive.inspections.and.maintenance..Proper.belt.ten-
sion.can.be.found.on.the.included.datasheet.specific.to.
each. fan.. A. log. should. be. kept. with. belt. tension. and.
replacement.information.
Bearing Maintenance
Proper.lubrication.of.the.fan.drive.bearings.helps.assure.
maximum.bearing.life..All.fans.are.equipped.with.decals.
indicating. re-lubrication. intervals. for. normal. operating.
conditions.. Bearings. should. be. inspected. after. the. first.
24.hours.of.operation.and.then.inspected.each.time.they.
are. lubricated.. Lubrication. schedules. for. the. included.
type.of.bearings.are.attached.to.the.fan..Note.that.all.
speeds. shown. do. not. apply. to. all. shaft. sizes. in. that.
group..Consult.the.factory.if.in.doubt.of.maximum.speed.
for. a. particular. bearing.. Note. that. every. installation. is.
different. and. the. frequency. of. re-lubrication. should. be.
adjusted.accordingly.
. On. high. moisture. applications. the. lubrication. fre-
quency.may.need.to.be.doubled.or.tripled.to.adequately.
protect.the.bearings..Double.the.relubrication.frequency.
on.fans.with.vertical.shafts.
. Observation.of.the.conditions.of.the.grease.expelled.
from.the.bearings.at.the.time.of.relubrication.is.the.best.
guide.as.to.whether.regreasing.intervals.and.amount.of.
grease.added.should.be.altered.
. Greases. are. made. with. different. bases.. There. are.
synthetic.base.greases,.lithium.base,.sodium.base,.etc..
Avoid.mixing.greases.with.different.bases..They.could.be.
incompatible. and. result. in. rapid. deterioration. or. break-
down.of.the.grease..The.lubrication.sticker.identifies.a.
list. of. acceptable. lubricants.. All. fan. shaft. bearings. are.
filled.with.a.lithium-based.grease.before.leaving.the.fac-
tory.unless.otherwise.specified..When.the.fans.are.start-
ed,.the.bearings.may.discharge.excess.grease.through.
the.seals.for.a.short.period.of.time..Do.not.replace.the.
initial. discharge. because. leakage. will. cease. when. the.
excess.grease.has.worked.out..Sometimes.the.bearings.
have. a. tendency. to. run. hotter. during. this. period.. This.
is.no.reason.for.alarm.unless.it.lasts.over.48.hours.or.
gets.very.hot.(over.200°F,.93°C).
. If. bearings. are. exhibiting. excessive. vibration. at. any.
time.or.are.running.hotter.than.200°F,.93°C,.the.bear-
ings. should. be. inspected. for. proper. lubrication,. align-
ment,. tightness. of. set. screws,. cap. bolts,. and. collars,.
and.inspected.for.signs.of.contamination.in.the.lubricant..
The.bearings.or.damaged.bearing.components.shall.be.
replaced.if.found.faulty.or.showing.signs.of.wear..When.
relubricating,.use.a.sufficient.amount.of.grease.to.purge.
the.seals..Rotate.bearings.by.hand.during.relubrication.
Wheel and Shaft Maintenance
Inspect.the.shaft.and.wheel.for.dirt.buildup,.corrosion,.
and.signs.of.excess.stress.or.fatigue.after.one.month.
of.service..Future.inspection.interval.shall.be.based.on.
findings.in.this.initial.inspection..Clean.the.components..
If. any. signs. of. damage,. stress,. or. fatigue. are. present.
(deformation,. cracks,. excessively. worn. surfaces). the.
part.shall.be.replaced..Any.material.buildup.on.rotating.
parts.or.parts.that.could.contact.rotating.parts.shall.be.
cleaned..If.the.wheel.is.removed.for.any.reason,.make.
sure. that. it. is. securely. attached. to. the. shaft. before.
restarting. the. fan.. The. wheel. and. shaft. shall. also. be.
inspected.any.time.excessive.vibration.is.observed.(filter.
in.readings.should.be.7.2.mm/s.RMS.or.less)..Reference.
ISO. 14694:2003,. “Industrial. Fans. –. Specifications. for.
Balance. Quality. and. Vibration. Levels”. for. more. details.
on.acceptable.fan.vibration.levels.
Structural Maintenance
All. structural. components. or. devices. used. to. support.
or.attach.the.fan.to.a.structure.should.be.checked.at.
regular. intervals.. Vibration. isolators,. bolts,. foundations,.
etc.,. are. all. subject. to. failure. from. corrosion,. erosion,.
and.other.causes..Improper.mounting.can.lead.to.poor.
operation.characteristics.or.fan.fatigue.and.failure..Check.
metallic. components. for. corrosion,. cracks,. or. other.
signs.of.stress..Replace.any.components.showing.any.
of. these. signs.. Concrete. should. be. checked. to. insure.
the.structural.integrity.of.the.foundation.and.repaired.or.
replaced.if.any.signs.of.damage.are.found.
. Where. the. fan. is. used. to. handle. toxic. gasses. or.
vapors,. the. housing,. and. welds. shall. be. inspected. for.
signs. of. corrosion. or. cracking. at. regular. intervals. to.
assure. no. toxic. gasses. can. escape.. The. condition. of.
the. coating. shall. be. inspected. as. well. to. verify. that.
bare.parts.of.the.fan.are.not.exposed..All.gaskets.and.
ducting.shall.be.inspected.for.signs.of.erosion.as.well..
An.initial.inspection.after.one.month.of.service.shall.be.
used.to.determine.an.appropriate.inspection.interval.
Fan Operation
Proper Use and Application
It.is.critical.that.fans.are.operated.only.as.their.design.
intended..Standard.construction.is.designed.for.standard.
applications.as.defined.below:
•. Clean.air.–.no.solids,.particles,.or.corrosive.or.abra-
sive.gasses..
•. Air.stream.temperatures.between.120°F.(49°C).and.
-20°F.(-29°C).with.a.maximum.temperature.fluctua-
tion.of.15°F.(8°C).per.minute..
•. Ambient.temperatures.shall.not.exceed.104°F.(40°C).
for.standard.design.fans.
•. Constant.speed.operation.
Operating.a.fan.in.any.of.the.following.conditions.could.
cause.a.safety.hazard:
•. Do.not.operate.a.fan.in.an.environment.that.it.was.
not.designed.for..This.includes.operating.the.fan.in.
temperatures. or. with. abrasive. or. corrosive. vapors.
or. chemicals. or. solid. material. (including. fly. ash).
other.than.the.fan.was.designed.for..Operating.at.
elevated.temperatures.or.with.abrasive.or.corrosive.
vapors.requires.special.considerations.that.must.be.
incorporated.in.the.design,.material.selection,.coat-
ing,.and.maintenance.of.the.fan..
•. Do.not.operate.a.fan.at.a.higher.speed.than.the.
fan,. drives,. seals,. bearings,. or. other. components.
were.designed.for..
•. Do.not.use.variable.rotational.speed.service.without.
first.consulting.Twin.City.Fan.Companies,.Ltd.
•. Do.not.operate.a.fan.without.the.bearings.and.cou-
plings. properly. lubricated.. Lubrication. intervals. are.
explained.in.corresponding.maintenance.sections.of.
this.manual..
•. Do.not.operate.a.fan.exhibiting.increased.vibration.
levels..Filter.in.readings.should.be.7.2.mm/s.RMS.
or.less.
•. Do.not.operate.the.fan.in.stall.
•. Do.not.operate.the.fan.with.replacement.or.added.
components. that. are. not. recommended. by. Twin.
City. Fan. Companies,. Ltd.. The. use. of. insufficient.
components. could. cause. premature. wear. and.
failure..