COOK CPL User Manual
CPL
Centrifugal Plenum Fans
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation and
maintenance instructions for standard units of the CPL
Centrifugal Plenum Fans.
Carefully read this publication and any supplemental documents prior to any installation or
maintenance procedure.
Loren Cook catalog CPL provides additional information
describing the equipment, fan performance, available
accessories, and specification data.
For additional safety information, refer to AMCA publication 410-96, Safety Practices for Users and Installers of
Industrial and Commercial Fans.
All of the publications listed above can be obtained from
Loren Cook Company by phoning 417/869-6474, extension
166; by FAX at 417/832-9431; or by e-mail at info@lorencook.com.
For information on special equipment, contact Loren
Cook Company Customer Service Department at 417/869-
6474.
Rotating Parts & Electrical Shock Hazard:
Disconnect electric power before working on unit.
Follow proper lockout / tagout procedures to ensure
the unit cannot be energized while being installed or
serviced.
A disconnect switch should be placed near the fan in
order that the power can be swiftly cut off, in case of
an emergency and in order that maintenance
personnel are provided complete control of the power
source.
Grounding is required. All field-installed wiring must
be completed by qualified personnel. All fieldinstalled wiring must comply with National Electric
Code (NFPA 70) and all applicable local codes.
Failure to follow these instructions could result in
death or serious injury.
Storage
If the fan is stored for any length of time prior to installation, completely fill the bearings with grease or moistureinhibiting oil (refer to Lubricants on page 5). Rotate the
wheel several revolutions every three to five days to keep a
coating of grease on all internal bearing parts.
Store the fan in its original crate and protect it from dust,
debris and the weather.
Outdoor Storage
To maintain good working condition of the fan when it is
stored outdoors, follow the additional instructions below.
• Coat the shaft with grease or a rust preventative compound.
• Wrap bearings for weather protection.
• Cover the entire fan to prevent the accumulation of dirt
and moisture in the fan.
• Periodically rotate the wheel and operate the dampers (if
supplied).
• Periodically inspect the fan to prevent damaging conditions.
Installation
Most motors are shipped mounted on the fans with belts
and drives installed. However, extremely heavy motors and
drives are shipped separately and some motors are shipped
separately due to height limitations. These motors and
drives will require field installation. Please refer to page 4.
Foundation
This fan requires a strong, level foundation of reinforced
poured concrete. A correctly designed concrete foundation
provides the best means for mounting floor units. The foundation’s size is determined by fan size and arrangement,
motor size and position, and the specific location of the
installation.
Receiving and Inspection
Carefully inspect the fan and accessories for any dam-
age and shortage immediately upon receipt of the fan.
• Turn the wheel by hand to ensure it turns freely and
does not bind.
• Inspect dampers (if supplied) for free operation of all
moving parts.
• Record on the Delivery Receipt any visible sign of
damage.
Handling
Lift the fan by the base or lifting eyes on the housing.
NOTICE! Never lift by the shaft, wheel, or motor.
CPL
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 vibration 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 isolators 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.
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 proximity factors.
Minimum
1 wheel
diameter
Figure 2 - Non-ducted Inlet Clearance
Wheel-to-Inlet Clearance
The correct wheel-to-inlet clearance is critical to
proper fan performance. This clearance should be verified 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.
Size Overlap
60 - 165 3/16”
Spring Isolator
Figure 1 - Floor Mount Isolators
Rubber-In-Shear Isolator
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.
180 - 245 1/4”
270 - 300 5/16”
330 - 365 3/8”
402 7/16”
445 - 490 1/2”
540 13/16”
Wiring Installation
All wiring should be in accordance with local ordinances and the National Electrical Code, NFPA 70.
Ensure the power supply (voltage, frequency, and current 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 fractional motors have to be removed in order to make the
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connection with the terminal box at the end of the
motor. To remove motor, remove bolts securing motor
base to power assembly . Do not remove motor mounting
bolts.
Use of Variable Frequency Drives
Motors -
Motors that are to be operated using a Variable Frequency Drive (VFD) must be VFD compatible. At a minimum, this must be a Premium Efficiency motor with
Class F insulation. Motors that are not supplied by Loren
Cook Company should have the recommendation of the
motor manufacturer for use with a VFD.
Grounding -
The fan frame, motor and VFD must be connected to
a common earth ground to prevent transient voltages
from damaging rotating elements.
Wiring -
Line reactors may be required to reduce over-voltage
spikes in the motors. The motor manufacturer should be
consulted for recommended line impedence and usage of
line reactors or filters, if the lead length between the VFD
and the motor exceeds 10 feet (3m).
Fan -
It is the responsibility of the installing body to perform
coast-down tests and identify any resonant frequencies
after the equipment is fully installed. These resonant frequencies are to be removed from the operating range of
the fan by using the “skip frequency” function in the VFD
programming. Failure to remove resonant frequencies
from the operating range will decrease the operating life of
the fan and void the warranty.
Wiring Diagrams
Single Speed, Single Phase Motor
Ground A
L
T-5
J-10
1
Line
L
2
Ground B
High Speed
L
1
L
2
Low Speed
Ground A
Line
Link A & B
L
Line
L
1
2
T-1
T-4
When ground is required, attach to ground A or B with no. 6 thread forming
screw. To reverse, interchange T-1 and T-4.
Ground B
2 Speed, 2 Winding, Single Phase Motor
Ground A
T-1
T-4
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4 leads.
Single Speed, Single Phase, Dual Voltage
Ground A
L
Line
L
1
2
T-5
J-10
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.
Link A
Link B
Low Voltage
Wiring Diagrams
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
1
728
To reverse, interchange any 2 line leads.
3
9
L2L
L
3
1
High Voltage
460 Volts
456
789
12
L2L
L
1
2 Speed, 1 Winding, 3 Phase Motor
High Speed
1
Together
2
Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
3
L
4
1
L
5
2
6
L
3
2 Speed, 2 Winding, 3 Phase
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
8
7
4
6
2
1
3
Line
L
1
3
L
2
Low Speed
Motor
L
High Voltage
9
5
3
3
460 Volts
789
456
3
12
L
L
L
1
3
2
L
1
1
L
2
2
L
3
Open
Line
3
4
5
6
Typical Damper Motor Schematic
Fan
Motor
Transformer**
Damper
Motor*
Second
Damper
Motor
L3
L2
L1
Transformer**
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
line leads.
For 3 phase, damper motor voltage should be the same between L1 and
L2. For single phase application, disregard L3. *Damper motors may be
available in 115, 230 and 460 volt models. The damper motor nameplate
voltage should be verified prior to connection. **A transformer may be provided in some installations to correct the damper motor voltage to the
specified voltage.
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