Aerovent ES-2-06 - Manual (Page 2)

2 Twin City Fan Companies Engineering Supplement 2-06
Handling
Handling of all air moving equipment should be con-
ducted by trained personnel and be consistent with safe
handling practices. Verify the lift capacity and operat-
ing condition of handling equipment. Maintain handling
equipment to avoid serious personal injury.
On most units, lifting lugs are fashioned to protect
the fan and fan housing from damage. Secure lifting
equipment to all provided lifting lugs to avoid instability
while moving the equipment. Units shipped completely
assembled may be lifted with slings and spreader bars.
(Use well-padded chains, cables or nylon straps.) Never
lift a fan by the inlet or discharge flange, shafting or
drives, wheel or impeller, motor or motor base, or in any
other manner that may bend or distort parts. Never lift
with slings or timbers passed through the fan inlets.
Partial or disassembled units require special handling. All
parts should be handled in a fashion which protects the
coatings and parts from damage. Components should be
handled such that forces are not concentrated to avoid
bending or distortion.
The housing should be lifted using straps and spread-
ers. Do not distort housing or side plates when lifting.
Bearing pedestals should be lifted using straps or
padded chains. Under no circumstance should an
attached or separated bearing pedestal be lifted by the
shaft, bearings, drives, motor or wheel.
The shaft and wheel assembly may be lifted using
a hoist and a spreader with a sling around the shaft
at points nearest the wheel. Use the spreader bar to
ensure that the slings do not push against the sides of
the wheel as this may distort the wheel. Take care not
to scratch the shaft where the wheel or bearings will
be mounted. Never lift or support the assembly by the
wheel. Always support the assembly by the shaft when
lifting or storing. Do not support the shaft or the wheel
on the housing sides.
Wheels shipped separately can be lifted by slings run-
ning between the blades or around the hub. Never lift
the wheel by blades or flanges. Always transport wheels
by lifting. Do not roll the wheel as this can damage
coatings and change the balance of the wheel.
Bent shafting is a source of vibration and bearing
failure, so handle the shaft with care. Any scratches on
the shaft may be removed with fine emery cloth or a
stone.
For roof ventilators, also see instructions specific to
handling roof ventilators in Appendix A.
Pins to hold insulation to the housing are supplied
for some high temperature fan designs. Use caution
when handling and working around fans that have these
insulation pins as the points are sharp.
Unit Storage
If fan installation is to be delayed, store the unit in
an environmentally stable and protected area. Vibration
should not exceed 0.051 mm peak – peak displacement
at the storage site unless the fan is properly isolated
from the vibration. The unit should be reasonably pro-
tected from any accidental impacts. Cover the fan to
protect coatings and to prevent any foreign material or
moisture from entering the inlet or discharge. Take care
to protect the motor, drives and bearings. The following
precautions should be taken during extended storage to
ensure the equipment is not damaged:
• Extended storage requires monthly inspections.
Check for corrosion or damage to the unit and for
debris within the fan.
• Bearings tend to take on moisture if the atmo-
sphere they are stored in is not at a constant
temperature. To avoid corrosion, it is necessary to
keep the bearings full of grease and to rotate them
periodically. Even when full of grease, bearings will
take on moisture, so it is necessary to purge the
bearings with new grease to expel moisture every
thirty days. It is recommended that the bearings be
purged with grease while being rotated by hand.
Do not use high-pressure greasers as they may
ruin the bearing seals.
• The drives and belts should be removed if the fan
is to be stored for a prolonged period. The drives
should be labeled for service and stored in a dry
place. Belts should be removed, coiled without
kinks, placed in a heavy carton, and stored in a
dry, well-ventilated place. To prevent belt deterio-
ration storage conditions should not exceed 85°F
and 70% humidity. If belts show signs of deteriora-
tion, they should be replaced prior to startup.
• Motors should be stored in a clean, dry, vibration-
free location. The packaging should be opened up
enough to allow air circulation around the motor.
The winding temperature should be kept slightly
above that of the surroundings to prevent conden-
sation. This can be accomplished by energizing
the internal heaters, if the motor is so equipped,
or by using space heaters. If it is impossible to
heat the windings, the motor should be wrapped
tightly with a waterproof material that also encloses
several bags of desiccant. Replace the desiccant
regularly to prevent moisture problems. The motor
rotor should also be rotated regularly (monthly) to
assure the bearing parts are well greased.
Foundations and Supporting Structures
— Industrial Fans
The best means of floor mounting a fan is on a well-
designed, flat, level concrete foundation. The foundation
should have a mass of at least three times that of
the supported assembly. The foundation should extend
150mm beyond the outer dimensions of the fan and
driver; however, it should be no more than twice the
area required for the equipment. If it is made larger, the
mass should be increased accordingly to resist rocking
modes of vibration. J or T type anchor bolts using one
size smaller than the nominal dimension of the base hole
shall be used. Anchor bolts should be tied into the rein-
forcing bar of the foundation for the foundation. A pipe
Figure 1. Lifting Lug Locations
Lifting Lugs
Lifting Lugs