Twin City Modular Plenum Fans - MPLFN / MPLFS / MPLQN / MPLQS - IM-495 - Manual (Page 4)

4 Twin City IM-495
Operation Check List
Verify that proper safety precautions have been followed:
□.Electrical.power.must.be.locked.off.
Check fan mechanism components:
□ System.connections.are.properly.made.and.tightened..□
□ Bearings.are.properly.lubricated.
□ Wheel,.drives.and.fan.surfaces.are.clean.and.free...
..of.debris.
□ Rotate.the.impeller.by.hand.to.verify.it.has.not.shifted.
..in.transit.
□ Check.fan/wheel.overlap..(See.Figure.4.)
Check fan electrical components:
□ Motor.is.wired.for.proper.supply.voltage.
□ Motor.was.properly.sized.for.power.and.rotational..
..inertia.of.rotating.assembly.
□ Motor.is.properly.grounded.
□ All.leads.are.properly.insulated.
Trial “bump”:
□ Turn.on.power.just.long.enough.to.start.assembly..
..rotating.
□ Check.rotation.for.agreement.with.rotation.arrow..
. Does. the. assembly. make. any. unusual. noise?..
..(See.Figure.5.)
□ Correct.any.problems.which.may.have.been.found..
..(Follow.safety.guidelines.-.shut.power.off.).Perform...
..checklist.again.until.unit.is.operating.properly.
□ Run.unit.up.to.speed.
Verify fastener tightness. These may have loosened dur-
ing shipment or installation.
□ Setscrews.attaching.wheel.hub.to.shaft.
□ Nuts.on.inlet.funnel.
□ Nuts.and.bolts.holding.motor.
□ Nuts.holding.housing.frame.to.base.and.base.to.
..ground.
□ Bolts.in.taper-lock.bushings.
□ Grease.line.connections.
After.one.week.of.operation,.check.all.nuts,.bolts.and.
setscrews.and.tighten.if.necessary.
Maintenance of Fans
This. section. contains. general. maintenance. instructions.
for.your.Twin.City.Fan.&.Blower.unit..For.specific.infor-
mation. about. maintenance. of. components,. particularly.
for.special.application.fans,.see.the.attached.documents.
General Motor Maintenance
The.three.basic.rules.of.motor.maintenance.are.keep.the.
motor.clean,.dry.and.properly.lubricated.
.
Keeping.motors.and.windings.clean.is.important.because.
dirt.and.dust.serve.as.thermal.insulators..Heat.normally.
dissipated. by. the. motor. is. trapped. causing. overheating.
and/or.premature.failure..Blow.dust.and.dirt.out.of.wind-
ings.and.off.the.motor.periodically..Use.low.pressure.(50.
psig).airstream.so.that.winding.damage.does.not.occur..
Keep.the.area.surrounding.the.motor.open.so.the.air.can.
circulate. through. the. motor. cooling. fan.. Follow. normal.
maintenance.schedule.given.to.the.right.
Motors.should.be.kept.dry.to.avoid.electrical.short.cir-
cuits.. Motors. kept. in. storage. for. long. periods. of. time.
can.have.moisture.condense.on.the.windings..Be.certain.
the.motor.is.dry.before.using.
Some.smaller.motors.are.lubricated.for.life..Motor.bear-
ing.lubrication,.if.required,.must.follow.a.rigorous.sched-
ule..Motors.less.than.10.hp.running.about.eight.hours.
a.day.in.a.clean.environment.should.be.lubricated.once.
every. five. years;. motors. 15. to. 50. hp,. every. 3. years;.
and.motors.50.to.150.hp,.yearly..For.motors.in.a.dusty.
or.dirty.environment.or.running.24.hours.a.day,.divide.
the.service.interval.by.2..If.the.environment.is.very.dirty.
or.high.temperatures.exist,.divide.the.service.interval.by.
4..Lubrication.requirements.are.normally.attached.to.the.
motor..Do.not.overlubricate.
.
A
DIA
B
Figure 4. Wheel-Funnel Overlap
Size A B Size A B
122 12.75 0.130 245/245C 25.51 0.50
150 15.62 0.172 270/270C 28.11 0.55
165 17.18 0.203 300/300C 31.23 0.61
182/182C 19.00 0.38 330/330C 34.36 0.67
200/200C 20.82 0.41 365/365C 38.00 0.75
222/222C 23.16 0.45
MPLFN/MPLFS/MPLQN/MPLQS
MPLFN, MPLFS,
MPLQN, & MPLQS
Wheels
Rotation
Figure 5. Proper Wheel Rotation