Twin City Fans With CE Mark - ES-2-06 - Manual (Page 13)

13. Twin.City.Fan.Engineering.Supplement.2-06
Air Capacity Problems
1..Resistance. of. the. system. is. not. at. design. rating.. If.
resistance. is. lower. than. expected,. both. airflow. and.
horsepower. may. be. up.. If. resistance. is. higher. than.
anticipated,.air.volume.will.be.down.
2..Fan.speed.is.not.at.design.speed.
3..Air.density.is.not.at.the.design.value..Also.check.air.
performance.measurement.techniques/procedures.
4..Devices. for. air. modulation. are. closed. or. plugged..
Also.check.filters.
5..Wheel.mounted.improperly.or.is.rotating.in.reverse.
6..Parts. of. the. system. or. fan. have. been. damaged. or.
need.cleaning.
Noise Problems
1..Air. performance. is. incorrect. and. the. fan. is. not. at.
design. point. of. operation.. Fan. is. being. forced. to.
operate.in.an.unstable.flow.region.
2..Bearing.failure..Check.bearings.(lubrication).
3..Supply.voltage.high.or.inconsistent.supply.frequency..
Adjustable. frequency. controllers. can. generate. motor.
noise.
4..Objects.that.are.installed.in.a.high.velocity.airstream.
can.generate.noise..This.includes.flow.sensors,.turn-
ing.vanes,.etc.
5..Poor.fan.inlet.conditions.
6..Acoustics.or.sound.measurement.procedure.incorrect.
Vibration Problems
1..Misalignment.of.drive.components.
2..Poor.foundation.or.mounting.structure.(resonances).
3..Foreign.material.attached.to.rotating.components.
4..Damaged. rotating. components. (bearings,. shaft,. fan,.
wheel,.sheaves).
5..Broken,.loose.or.missing.setscrews.
6..Loose.bolts.
7..Vibration.transmitted.by.another.source.
8..Water.accumulating.in.airfoil.blades.
9..Fan.is.operating.in.stall.or.unstable.flow.region.
Motor Problems
1..Incorrect.wiring.
2..Speed.of.fan.too.high.
3..Parts.improperly.installed;.binding.
4..Bearings.improperly.lubricated.
5..WR
2. capability.of.motor.too.low.for.application.
6..Protection.devices.may.be.improperly.sized.
Drive Problems
1..Belts.improperly.tensioned.
2..Drive.alignment.is.poor.
Disposal
All. metal. and. other. recyclable. materials. should. be.
separated.and.properly.recycled..Paint,.insulation,.plastic,.
packaging. materials,. lubricants,. electrical. components.
and. other. items. should. be. disposed. of. per. local.
regulations.
Handling
Roof.ventilators.should.be.lifted.by.using.straps.around.
the.fan.housing.or.base.only..Spreader.bars.should.also.
be.used.to.avoid.damage.to.stack.caps.or.hoods..DO.
NOT. LIFT. ROOF. VENTILATORS. BY. THE. STACK. CAP.
OR. HOOD.. On. hooded. units,. disassemble. the. stack.
from. hood. when. lifting.. Upblast. models. may. be. lifted.
assembled.
Installation Instructions. –. Follow. the. above. section.
titled. “Fan. Installation,. Factory. Assembled. Units”. with.
the. exception. of. the. instructions. below. for. commercial.
ventilators.
. Roof.ventilators.should.always.be.mounted.to.a.flat,.
level,. solid. and. rigid. structure.. Particular. caution. should.
be.exercised.when.installing.fans.on.metal.buildings..Be.
sure.wall.or.roof.is.capable.of.supporting.the.fan(s)..Fans.
mounted. on. walls. or. roofs. and. not. supported. correctly.
will.cause.vibration.that.could.cause.damage.or.injury.
. Fans. mounted. off. ground. level. should. be. rigidly.
mounted.to.a.structural.platform.and.be.placed.over.or.
as.near.as.possible.to.a.solid.wall.or.column.
. Support.for.suspended.fans.must.be.cross-braced.for.
live. load. support. to. prevent. side. sway.. Use. guy. wires.
to.help.secure.roof.units.if.excessively.windy.conditions.
prevail.
Appendix A – Commercial Ventilator Installation instructions
. When. the. roof. ventilator. is. designed. to. be. mounted.
on.a.curb,.the.curb.should.be.securely.installed.prior.to.
the.fan.installation.
. A.damper,.if.used,.should.be.securely.mounted.within.
the. curb. or. wall. in. a. manner. which. allows. free. and.
unobstructed.operation.
. On. roof. units,. anchor. the. fan. securely. to. the. curb..
Anchoring. through. the. vertical. portion. of. the. curb. cap.
flange.is.recommended..Use.a.minimum.of.four.lag.bolts.
or.other.suitable.fasteners..See.Fig.8.below.
Figure 8. Mounting Roof Ventilator to Curb Cap