This publication contains the installation, operation
and maintenance instructions for standard units of the
CPL-Centrifugal Plenum Fans
lication prior to any installation or maintenance procedure.
Loren Cook catalog,
describing the equipment, fan performance, available
accessories, and specification data.
For additional safety information, refer to AMCA publication 410-96,
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.
Safety Practices for Users and Installers of
CPL
. Carefully read this pub-
, provides additional information
.
Receiving and Inspection
Carefully inspect the fan and accessories for any damage
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
age.
Delivery Receipt
any visible sign of dam-
Handling
Lift the fan by the base or lifting eyes on the housing.
Never lift by the shaft, wheel, or motor.
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.
Personal Safety
Disconnect switches are recommended. Place the
disconnect switch 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.
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.
WARNING
This unit has rotating parts. Safety precautions
should be exercised at all times during installation,
operation, and maintenance.
ALWAYS disconnect power prior to working on fan.
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
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.
Lubricants
on page 5). Rotate the
CPL
Page 2
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.
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.
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.
Note
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.
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.
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.
Duct Installation
Efficient fan performance relies on proper installation.
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.
Ground B
When ground is required, attach to ground A or B with no. 6 thread forming
screw. To reverse, interchange T-1 and T-4.
1
Line
L
2
Wiring Diagrams
3 Phase, 9 Lead Motor
To reverse, interchange any 2 line leads.
Low Voltage
208/230 Volts
4
6
5
3
1
9
728
L2L
L
1
3
2 Speed, 2 Winding, Single Phase Motor2 Speed, 1 Winding, 3 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.
High Speed
L
1
L
2
Low Speed
Line
To reverse, interchange any 2 line leads. Motors require magnetic control.
Motor
High Speed
1
Together
2
3
L
4
L
5
6
L
1
2
Line
3
Motor
Single Speed, Single Phase, Dual Voltage2 Speed, 2 Winding, 3 Phase
Ground A
L
Line
L
1
T- 5
J-10
2
Ground B
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
Ground A
Link A & B
L
1
Line
L
2
Low Speed
T
3
Low Speed
T
2
Low Speed
T
Motor
To reverse: High Speed-interchange leads T
Low Speed-interchange leads T
line leads.
1
T
11
T
12
T
13
High Speed
High Speed
High Speed
and T
1
. Both Speeds-interchange any 2
2
Typical Damper Motor Schematic
Fan
Motor
Transformer**
Transformer**
L3
L2
L1
For 3 phase, damper motor voltage should be the same between L
L
. For single phase application, disregard L
2
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.
. *Damper motors may be
3
High Voltage
460 Volts
456
789
12
L
1
Low Speed
and T
11
and
1
3
L2L
1
2
3
4
5
6
.
12
3
L
1
L
2
L
3
Open
L
L
L
Line
1
2
3
Line
Damper
Motor*
Second
Damper
Motor
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.
Lock off all power sources before unit is wired to
power source.
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 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.
Personal Safety
Disconnect switches are recommended. Place the
disconnect switch 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.
Page 4
Follow the wiring diagram in the disconnect switch
and the wiring diagram provided with the motor. Correctly label the circuit on the main power box and
always identify a closed switch to promote safety (i.e.,
red tape over a closed switch).
obtained by firmly pressing the belt. Refer to figure 3.
c. Lock the motor plate adjustment bolts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 4.
Correct
Incorrect
AirfoilBackward
Proper Wheel Rotation
Inclined
Wheel Rotation
Test the fan to ensure the rotation of the wheel is the
same as indicated by the arrow marked Rotation.
115 and 230 Single Phase Motors
Fan wheel rotation is set correctly at the factory. Changing the rotation of this type of motor should only be
attempted by a qualified electrician.
208, 230, and 460, 3 Phase Motors
These motors are electrically reversible by switching two
of the supply leads. For this reason, the rotation of the fan
cannot be restricted to one direction at the factory. See
Wiring Diagrams on page 3 for specific information on
reversing wheel direction.
Do not allow the fan to run in the wrong direction.
This will overheat the motor and cause serious damage. For 3-phase motors, if the fan is running in the
wrong direction, check the control switch. It is possible
to interchange two leads at this location so that the fan
is operating in the correct direction.
1/4 inch
1 foot
Figure 3
Belt and Pulley Installation
Belt tension is determined by the sound the belts make
when the fan is first started. Belts will produce a loud
squeal which dissipates after the fan is operating at full
capacity. If the belt tension is too tight or too loose, lost efficiency and possible damage can occur.
Do not change the pulley pitch diameter to change tension. This will result in a different fan speed than desired.
a. Loosen motor plate adjustment bolts and move motor
plate in order that the belts can easily slip into the
grooves on the pulleys. Never pry, roll, or force the
belts over the rim of the pulley.
b. Slide the motor plate back until proper tension is
reached. For proper tension a deflection of approximately 1/4” per foot of center distance should be
IncorrectIncorrect
Figure 4
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley setscrew and by
moving the motor pulley on the motor
shaft or by moving the entire motor along
the motor mounting bracket.
Figure 4 illustrates correct and incorrect pulley alignment. A recommended
method of inspecting the pulley alignment is shown in Figure 5. With the
Figure 5
shorter leg of a carpenter’s square or other straight edge
lying along the case of the motor, adjust the position of the
motor pulley (or the motor until the longer leg of the square
is parallel to the belt.
Final Installation Steps
a. Inspect fasteners and setscrews, particularly fan
mounting and bearing fasteners, and tighten according to the recommended torque shown in the table
Recommended Torque for Setscrews/Bolts
.
b. Inspect for correct voltage with voltmeter.
c. Ensure all accessories are installed.
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power
sources.
b. Ensure fasteners and setscrews, particularly those
used for mounting the fan, are tightened.
c. Inspect belt tension and pulley alignment.
d. Inspect motor wiring.
e. Ensure belt touches only the pulleys.
f. Ensure fan and ductwork are clean and free of debris.
g. Inspect wheel-to-inlet clearance. The correct wheel-
to-inlet clearance is critical to proper fan performance.
h. Close and secure all access doors.
i. Restore power to the fan.
Page 5
t
Belt
4
S
o
tart Up
Turn the fan on. In variable speed units, set the fan to its
lowest speed and inspect for the following:
• Direction of rotation.
• Excessive vibration.
• Unusual noise.
• Bearing noise.
• Improper belt alignment or tension (listen for squealing).
• Improper motor amperage or voltage.
If a problem is discovered, immediately shut the fan
off. Lock out all electrical power and check for the
cause of the trouble. See Troubleshooting .
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory opera-
tion. During the inspections, stop the fan and inspect as per
the
Conditions Chart
30 Minute Interval
Inspect bolts, setscrews, and motor mounting bolts.
Adjust and tighten as necessary.
8 Hour Interval
Inspect belt alignment and tension. Adjust and tighten as
necessary.
24 Hour Interval
Inspect belt tension, bolts, setscrews, and motor mounting bolts. Adjust and tighten as necessary.
Maintenance
Establish a schedule for inspecting all parts of the fan.
The frequency of inspection depends on the operating conditions and location of the fan.
Inspect fans exhausting corrosive or contaminated air
within the first month of operation. Fans exhausting contaminated air (airborne abrasives) should be inspected
every three months.
Regular inspections are recommended for fans exhausting non-contaminated air.
It is recommended the following inspection be conducted
twice per year.
• Inspect bolts and setscrews for tightness. Tighten as
necessary. Worn setscrews should be replaced immediately.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. Refer
• Bearings should be inspected as recommended in the
• Inspect variable inlet vanes for freedom of operation
• Inspect isolation base for freedom of movement.
• Inspect springs and rubber isolators for deterioration
• Inspect for cleanliness. Clean exterior surfaces only.
Lubricants
Loren Cook Company uses petroleum lubricant in a lithium base. Other types of grease should not be used unless
the bearings and lines have been flushed clean. If another
type of grease is used, it should be a lithium-based grease
conforming to NLGI grade 2 consistency.
A NLGI grade 2 grease is a light viscosity, low-torque,
rust-inhibiting lubricant that is water resistant. Its temperature range is from -30 ° F to +200 ° F and capable of intermittent highs of +250 ° F.
Motor Bearings
Motor bearings are pre-lubricated and sealed. Under normal conditions they will not require further maintenance for
a period of ten years. However, it is advisable to have your
maintenance department remove and disassemble the
motor, and lubricate the bearings after three years of operation in excessive heat and or in a contaminated airstream
consisting of airborne abrasives.
Fan Bearings
Greasable fan bearings are lubricated through a grease
fitting on the bearing and should be lubricated by the
schedule,
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can burst
seals thus reducing bearing life.
In the event the bearing cannot be seen, use no more
than three injections with a hand-operated grease gun.
Motor Services
Should the motor prove defective within a one-year
period, contact your local Loren Cook representative or
your nearest authorized electric motor service representative.
Changing Shaft Speed
All belt driven fans with motors up to and including 5 HP
(184T max.) are equipped with variable pitch pulleys. To
change the fan speed, perform the following:
a. Loosen setscrew on driver (motor) pulley and remove
b. Turn the pulley rim to open or close the groove facing.
c. After adjustment, inspect for proper belt tension.
and Pulley Installation
Conditions Chart
.
and excessive wear. The vane position should agree
with the position of the control arm. As the variable inlet
vanes close, the entering air should spin in the same
direction as the wheel.
and replace as needed.
Removing dust and grease on motor housing assures
proper motor cooling. Removing dirt from the wheel
and housing prevent imbalance and damage.
Conditions Chart
key, if equipped.
If the pulley has multiple grooves, all must be adjusted
to the same width.
, page
.
.
.
Page 6
Speed Reduction
Open the pulley in order that the belt rides deeper in
the groove (smaller pitch diameter).
Speed Increase
Close the pulley in order that the belt rides higher in
the groove (larger pitch diameter). Ensure that the RPM
limits of the fan and the horsepower limits of the motor
are maintained.
Conditions Chart
RPMTemperature
100Up to 120˚FClean6 to 12 months
500 Up to 150˚FClean2 to 6 months
1000 Up to 210˚FClean2 weeks to 2 months
1500 Over 210˚FCleanWeekly
Any
Speed
Any
Speed
Any
Speed
Any
Speed
Up to 150˚FDirty1 week to 1 month
Over 150˚FDirtyDaily to 2 weeks
Any TemperatureVery DirtyDaily to 2 weeks
Any Temperature
Fan
Status
Extreme
Conditions
Greasing
Interval
Daily to 2 weeks
Pulley and Belt Replacement
a. Remove pulleys from their respective shafts.
b. Clean the motor and fan shafts.
c. Clean bores of pulleys and coat the bores with heavy
oil.
d. Remove grease, rust, or burrs from the pulleys
e. Remove burrs from shaft by sanding.
f. Place fan pulley on fan shaft and motor pulley on its
shaft. Damage to the pulleys can occur when exces-
sive force is used in placing the pulleys on their
respective shafts.
g. Tighten in place.
h. Install belts on pulleys and align as described in the
Belt and Pulley Installation
section.
Bearing Replacement
The fan bearings are pillow block ball bearings. Bearings
should be replaced individually for each side of fan.
An emery cloth or file may be needed to remove imper-
fections in the shaft left by the setscrews.
a. Remove belts.
b. If replacing drive side bearing, mark location of pulley
and remove.
c. Mark bearing location on bearing support and loosen
bearing hold down bolts.
d. Support the shaft to remove weight from bearing.
e. Remove anti-corrosion coating from the shaft with a
suitable degreaser.
f. Remove the bearing from the shaft using a bearing
puller. If a bearing puller is not available, tap on the
bearing with a wood block and hammer to remove it.
g. Smooth and clean the shaft and bearing bore thor-
oughly.
h. Place the bearings into position making sure they are
not on a worn section of the shaft. Tapping the inner
ring face with a soft driver may be required.
Do not hammer on the housing.
i. The outer ring of the bearing is spherical and swivels
in the housing to compensate for misalignment.
Secure hold-down bolts, but do not fully tighten.
j. Align the setscrews on the bearings and tighten one
setscrew on each bearing.
k. Rotate the shaft to allow the bearing outer rings to find
their center of free movement.
l. Tighten hold-down bolts to proper torque as shown in
the torque chart.
m. Turn the shaft by hand. Resistance should be the
same as it was before hold-down bolts were fully tightened.
n. Tighten bearing setscrews to specified torque (see
chart).
o. Re-install the pulley and adjust the belt tension. Refer
to Belts and Pulley Installation.
p. Repeat the process for opposite bearing.
q. Adjust the belt tension.
r. Test run and retighten all setscrews and bolts. Trim bal-
ance as necessary (.0785 in/sec max.).
After 24 hours of operation, retighten the setscrews to
the appropriate torque. This assures full locking of the inner
race to the shaft. Make sure the socket key or driver is in
good condition with no rounded corners. The key should be
fully engaged in the setscrew and held squarely to prevent
rounding out of the setscrew socket when applying maximum torque.
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly.
•Poor fan inlet conditions. There should be a straight clear duct at the
inlet.
•Improper wheel alignment.
Excessive Vibration and Noise
•Damaged or unbalanced wheel.
•Belts too loose; worn or oily belts.
•Speed too high.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly.
•Bearings need lubrication or replacement.
•Fan surge or incorrect inlet or outlet conditions.
Overheated Motor
•Motor improperly wired.
•Incorrect direction of rotation. Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly.
•Cooling air diverted or blocked.
•Improper inlet clearance.
•Incorrect fan RPMs.
•Incorrect voltage.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
Page 7
CPL Parts List - Arrangement 3
4
8
7
9
6
10
5
3
2
1
15
Part
No.
1Motor Sheave9Inlet Cone
2Motor10Inlet Panel
3Belt Set11Inlet Side Bearing
4Fan Sheave12Inlet Side Bearing Support
5Shaft13Pedestal Assembly
6Drive Side Bearing14Isolation Base
7Wheel15Motor Slide Base
8Safety Screen Enclosure (optional)
14
Description
Sizes 120 - 730Sizes 120 - 730
13
Part
No.
11
Description
CPL Parts List (Arrangement 3S)
8
1
2
3
4
6
5
7
9
10
12
11
12
13
14
Part
No.
1Pedestal Assembly8Safety Screen Enclosure (optional)
2Fan Sheave9Inlet Cone
3Belt Set10Inlet Panel
4Motor Base11Inlet Side Bearing
5Shaft12Inlet Side Bearing Support
6Drive Side Bearing13Motor
7Wheel14Motor Sheave
Limited Warranty
Loren Cook Company warrants that your Loren Cook fan was manufactured free of defects in materials and workmanship, to the extent stated herein. For a period of one (1)
year after date of shipment, we will replace any parts found to be defective without charge, except for shipping costs which will be paid by you.
This warranty is granted only to the original purchaser placing the fan in service.
This warranty is void if the fan or any part thereof has been altered or modified from its original design or has been abused, misused, damaged or is in worn condition or if
the fan has been used other than for the uses described in the company manual. This warranty does not cover defects resulting from normal wear and tear.
To make a warranty claim, notify Loren Cook Company, General Offices, 2015 East Dale Street, Springfield, Missouri 65803-4637, explaining in writing, in detail, your complaint and referring to the specific model and serial numbers of your fan. Upon receipt by Loren Cook Company of your written complaint, you will be notified, within thirty (30)
days of our receipt of your complaint, in writing, as to the manner in which your claim will be handled. If you are entitled to warranty relief, a warranty adjustment will be completed within sixty (60) business days of the receipt of your written complaint by Loren Cook Company.
This warranty gives only the original purchaser placing the fan in service specifically the right. You may have other legal rights which vary from state to state.
Description
Sizes 120 - 730Sizes 120 - 730
Part
No.
Description
Page 8
CPL Parts List (Arrangement 3T)
2
1
Part
No.
1Motor Sheave7Inlet Cone
2Motor8Inlet Panel
3Belt Set9Inlet Side Bearing
4Fan Sheave10Motor Base
5Shaft11Inlet Side Bearing Support
6Wheel12Pedestal Assembly
4
3
5
12
Description
Sizes 120 - 730Sizes 120 - 730
Part
No.
6
7
8
9
Description
CPL Parts List (Arrangement 3V)
1
4
5
10
11
Part
No.
6
Description
2
3
9
8
Part
No.
1Pedestal Assembly6Inlet Panel
2Shaft7Inlet Side Bearing Support
3Drive Side Bearing8Motor
4Wheel9Motor Base
5Inlet Cone
Description
Sizes 120 - 730Sizes 120 - 730
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
www.lorencook.com
7
CPL IOM- January 1999
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