Q & R
Chicago Blower Corporation equipment is prepared for shipment in
accordance with the Uniform Freight Classification. It is thoroughly
inspected at the factory and, barring damage in transit, should be in
good condition upon arrival.
When a carrier signs Chicago Blower Corporation’s bill of lading, the
carrier accepts the responsibility
for any subsequent shortages or
damage evident or concealed, and
any claim must be made against
the carrier by the purchaser.
Evident shortage or
damage should be
noted on the carrier’s delivery document
before signature of accep-
tance. Inspection by the carrier of damage evident or concealed must be
requested. After inspection, issue a purchase order for necessary parts
or arrange for return of the equipment to Chicago Blower Corporation
factory for repair.
Chicago Blower fans are shipped, skidded, and may be handled and
moved using good rigging techniques, being careful to avoid concentrated
stresses that distort any of the parts.
If the fan installation is to be delayed, store the unit in a dry, protected
area. Protect the fan, especially fan and motor bearings, from moisture
and vibration. Protect all machined surfaces such as shafts, couplings,
and bushings. Rotate the wheel several revolutions every two weeks,
stopping the wheel in a position other than its initial position. Keep the
bearings fully greased by filling monthly with a grease compatible to that
originally supplied. Contact Chicago Blower for extended storage instructions.
The fan which you have purchased is a rotating piece of equipment and
can become a source of danger to life or cause injury if not properly
maximum operating temperature
for which this
fan is designed
must not be exceeded
. These limits are given in our
catalog or on Chicago Blower Corporation drawings.
Personnel who will operate this fan, or those who will perform mainte-
must be given this bulletin to read and warned of the
potential hazards of this equipment.
This pamphlet contains general recommendations, but specific require-
ments may apply to the individual installation. Such requirements are
outlined in federal, state and local safety codes. Strict compliance with
these codes, and strict adherence to these installation instructions are
the responsibility of the user.
1. Good results
require a proper foundation
. Foundations should be
level, rigid, and of sufficient mass for the equipment. Concrete is
preferable. Its mass should be at least four times the fan weight.
Adequately brace steel platforms in all directions. The minimum natu-
ral frequency of any part must be at least 50% higher than the fan
2. Shim the fan support points before tightening foundation bolts. Do not
distort or twist the equipment. Duct connections should be smooth
and straight. Elbows and other transitions should be located at least
five wheel diameters from fan inlet and outlet (see AMCA Publication
201 for further details).
should be used at inlet
and discharge. The
fan should never support or restrain
weight or force.
3. Make sure the power is locked “OFF”.
4. Check wheel-to-inlet clearance to make sure it has not shifted during
shipment or handling. There should be approximately equal radial
clearance all around. Rotate wheel by hand to check that it runs free.
5. If the wheel is striking, correct it by
loosening the hub set screws and
reposition the wheel on the shaft, or
loosen the motor mounting bolts
(for Arrangement 4 fans) and
realign the wheel to the inlet so it
does not hit. Position the wheel so
that the set screw over the key is at
the bottom. Torque the bottom set
screw first and then the opposing
set screw next. Torque all set
screws per Torque Values chart.
Turn wheel by hand to verify wheel
to inlet cone clearance.
6. If the fan wheel is fastened with a taper-lock bushing and the wheel
must be shifted, follow this procedure:
a. Remove all bolts from the bushings.
b. Insert two bolts in the threaded holes in the bushing. (Note that one
bolt is left over and not used in the demounting.)
c. Tighten bolts alternately until bushing is loosened in hub. If bushing
does not loosen immediately, lightly tap hub while applying
torque to the bolts.
To reinstall the taper-lock bushing in the wheel hub, insert the three
mounting bolts through the unthreaded bushing holes into the hub.
Alternately tighten the bolts. When tightening, the bolts should be
turned down equally to the Initial Torque requirement given below.
Then tighten the bolts progressively one-half turn per bolt to the
Second Torque setting. Finally, the bolts should be tightened in small
increments to the Final Torque settings.
*Torque values shown are inch lbs. and apply when both components
are either aluminum or steel. If either component is aluminum, use
values for aluminum. Values for steel are for Grade 5 hardware.
Check bushing to verify type or refer to bushing box sent with the fan.
7. Check the motor wiring and fusing in accordance with the National
Electrical Code and local requirements. Follow wiring diagram on the
8. Chicago Blower requires that all appurtenances, including ductwork or
stacks, which are attached to the fan inlet or outlet, be independently
supported, unless prior approval has been obtained from Chicago
Blower. Excess dead loads or wind loads can distort the fan housing
causing misalignment and possible failure. Flexible connections are
also necessary to prevent duct expansion or movement from adding
loads to the fan.
9. Chicago Blower recommends the use of caulk or gasket when
mounting appurtenances to the inlet or outlet flanges to minimize
Steel Grade 2
SET SCREW TORQUE VALUES