COOK CPL - Manual (Page 2)

2
Duct Installation
Efficient fan performance relies on proper installa-
tion.
If the fan has an open inlet (no duct work), be sure it
is placed one fan wheel diameter away from walls and
bulkheads. Refer to figure 2.
Refer to the CPL catalog for discharge wall proxim-
ity factors.
Wheel-to-Inlet Clearance
The correct wheel-to-inlet clearance is critical to
proper fan performance. This clearance should be ver-
ified before initial start-up since rough handling during
shipment could cause a shift in fan components. Refer
to wheel/inlet drawing for correct overlap.
Adjust the overlap by loosening the wheel hub and
moving the wheel along the shaft to obtain the correct
value.
A uniform radial gap
(space between the
edge of the cone and
the edge of the inlet) is
obtained by loosening
the inlet cone bolts and
repositioning the inlet
cone.
Wiring Installation
All wiring should be in accordance with local ordi-
nances and the National Electrical Code, NFPA 70.
Ensure the power supply (voltage, frequency, and cur-
rent carrying capacity of wires) is in accordance with
the motor nameplate.
Leave enough slack in the wiring to allow for motor
movement when adjusting belt tension. Some frac-
tional motors have to be removed in order to make the
Size Overlap
60 - 165 3/16”
180 - 245 1/4”
270 - 300 5/16”
330 - 365 3/8”
402 7/16”
445 - 490 1/2”
540 13/16”
Minimum
1 wheel
diameter
Figure 2 - Non-ducted Inlet Clearance
Use the following guidelines to calculate foundation size:
• The overall dimensions of the foundation should extend
at least 6 inches beyond the outline of the fan and its
motor.
• The weight of the foundation should be 2 to 3 times the
weight of the fan and its motor.
Isolation
Isolation Base
If supplied, mount the fan on the rigid isolation base that
runs the entire length of the fan base angle.
When the motor is not an integral part of the unit, mount
the fan and its motor to a common rigid base running the
full length of the fan and motor.
NOTICE! Although a certain amount of vibration is
inherent in operating centrifugal fans, extreme vibra-
tion is a serious problem that may cause structural and
mechanical failure.
The base must have sufficient rigidity to resist belt pull
and prevent drive distortion which can lead to excessive
belt and bearing wear. Isolators should be located between
this rigid base and the floor.
Isolators
Floor Mounted Spring Isolators
• Mount fan and motor on an isolation base (if supplied).
• Elevate fan (or isolation base) to operating height and
insert blocks to hold in position.
• Position isolators under the fan and/or isolation base
and vertically align by inserting leveling bolt through
mounting holes in the fan or the base. The isolator
must be installed on a level surface.
• Adjust the isolators by turning the leveling nut counter
clockwise several turns at a time alternately on each
isolator until the fan weight is transferred onto the isola-
tors and the fan raises uniformly off the blocks. Then
remove the blocks.
• Turn lock nut onto leveling bolt and secure firmly in
place against the top of the mounting flange or frame.
• Secure isolators to mounting surface.
Floor Mounted Rubber-In-Shear (RIS) Isolators
• Mount fan and motor on an isolation base (if supplied).
• Elevate fan to provide room to insert isolators between
base and foundation or between the fan and foundation
and block in position.
• Position isolators under isolation base or fan and
secure bolts.
• Remove blocks and allow unit to rest on floor. Isolators
must be installed on a level surface (leveling should not
be required).
• Secure isolators to mounting surface.
Rubber-In-Shear Isolator Spring Isolator
Figure 1 - Floor Mount Isolators