Twin City Heavy Duty Centrifugal Fans - ES-995 - Manual

Introduction
This bulletin has been prepared to guide the users of heavy
duty centrifugal fans in the proper installation, operation and
maintenance procedures to insure maximum equipment life
with trouble-free operation.
Many fans of this type have custom features or compo-
nents. When manufacturers of components provide detailed
installation and operation manuals, they will be provided.
Because of the wide variety of equipment covered in this
bulletin, the instructions given here are general in nature.
Additional product and engineering information is available
at www.tcf.com.
For safe installation, startup and operational life of this
equipment, it is important that all involved with the equipment
be well versed in proper fan safety practices and read this
bulletin. Please review the safety section before beginning
any work. It is the user’s responsibility to make sure that
all requirements of good safety practices and any applicable
safety codes are strictly adhered to.
Shipping and Receiving
All Twin City Fan & Blower products are carefully constructed
and inspected before shipment to insure the highest standards
of quality and performance. Compare all components with the
bill of lading or packing list to verify that the proper unit was
received. Check each unit for any damage that may have
occurred in transit. Any damage should be reported imme-
diately to the carrier and the necessary damage report filed.
Handling
Handling of all air moving equipment should be conducted
by trained personnel and be consistent with safe handling
practices. Verify the lift capacity and operating condition of
handling equipment. Maintain handling equipment to avoid
serious personal injury.
Units shipped completely assembled may be lifted with
slings and spreader bars. (Use well-padded chains, cables
or nylon straps.) On most units, lifting lugs are fashioned to
protect the fan and fan housing from damage. 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 coat-
ings 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 spreaders.
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 sepa-
rated 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 running
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.
Unit Storage
If fan installation is to be delayed, store the unit in an envi-
ronmentally stable and protected area. During storage, the fan
should not be subjected to vibration from external sources or
bearing damage may occur. The unit should be reasonably
protected from any accidental impacts. Cover the fan to pro-
tect coatings and to prevent any foreign material or moisture
from entering the inlet or discharge. Take care to protect the
motor, drives and bearings.
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 atmosphere in
which they are stored 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.
Spherical roller bearings with split pillow block housings must
be opened up and grease removed before start-up.
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 deterioration, they should be
replaced prior to startup.
Motors should be stored in a clean, dry, vibration-free loca-
tion. 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
condensation. 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
which 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
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.
Rigid foundation stiffness must be between 1x10 6 lbs./in. to
4x10 6 lbs./in. depending upon size and speed. The founda-
tion should extend 6" 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 of sufficient size should
be used and should be tied into the reinforcing bar for the
foundation. After the concrete is poured, a pipe sleeve with
a diameter of 2 to 2 1 ⁄
2
times the anchor bolt diameter should
be provided around the anchor bolt for final adjustment (see
Figure 4). The mounting surface of the foundation should be
smooth for good shim contact. When deciding the thickness
©2012 Twin City Fan Companies, Ltd.
ES-995
September 2012
Heavy Duty Centrifugal Fans
INSTALLATION, OPERATION & MAINTENANCE MANUAL