COOK PLC User manual

Storage
If the fan is stored for any length of time prior to installa-
tion, completely fill the bearings with grease or moisture-
inhibiting 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:
• Coat the shaft with grease or a rust preventative com-
pound.
• 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 condi-
tions.
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 foun-
dation’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.
Centrifugal Plenum Fans
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
PLC
This publication contains the installation, operation and
maintenance instructions for standard units of the PLC -
Centrifugal Plenum Fans. Carefully read this publication
prior to any installation or maintenance procedure.
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Loren Cook Company’s PLC catalog provides additional
information describing the equipment, fan performance,
available accessories, and specification data.
For additional safety information, refer to AMCA publica-
tion 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 [phone], exten-
sion 166; by FAX at [phone]; or by e-mail at
[email protected].
For information on special equipment, contact Loren
Cook Company Customer Service Department at (417)
869-6474.
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.
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 field-
installed 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.
PLC

2
Refer to the PLC catalog for discharge wall proximity
factors.
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 draw-
ing for correct overlap.
Adjust the overlap by loosening the wheel hub and mov-
ing 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 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 name-
plate.
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 connec-
tion 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.
Minimum
1 wheel
diameter
Figure 2 - Non-ducted Inlet Clearance
Wheel/Inlet Overlap
Size Overlap
120 .250
135
150 .313
165 .375
180
195 .438
210
225 .500
245 .563
270 .625
300 .688
330 .625
365 .688
402 .750
445 .875
490 .938
540 1.063
600 1.108
660 1.313
730 1.438
See Detail A
Overlap
Radial Gap
Detail A
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.
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.
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.
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 bulk-
heads. Refer to figure 2.
Rubber-In-Shear Isolator
Spring Isolator
Figure 1 - Floor Mount Isolators

3
Ground A
Ground B
T-1
T-4
Low Speed
High Speed
L1
L2
Line
Motor
1
2
3
4
5
6
Together
High Speed
Line
L1
L2
L3
1
2
3
4
5
6
Open
Low Speed
Line
L1
L2
L3
Motor
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 fre-
quencies 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.
Use of Variable Frequency Drives
Motors
Motors that are to be operated using a Variable Fre-
quency Drive (VFD) must be VFD compatible. At a mini-
mum, 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 Diagrams
When ground is required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4.
Single Speed, Single Phase Motor
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4 leads.
2 Speed, 2 Winding, Single Phase Motor
Single Speed, Single Phase, Dual Voltage 2 Speed, 2 Winding, 3 Phase
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T1and T2. Both Speeds-interchange any 2
line leads.
2 Speed, 1 Winding, 3 Phase Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
T-1
T-4
Ground B
L2
L1
Ground A
Line
To reverse, interchange any 2 line leads.
7
1
6789
456
12 3
Low Voltage
208/230 Volts
High Voltage
460 Volts
8
2
4
9
3
5
L1L3
L2
L1L3
L2
3 Phase, 9 Lead Motor
Delta-Connection
456
1
7
2
8
3
9
L1L2L3
456
789
12 3
L1L2L3
Low Voltage
208/230 Volts
High Voltage
460 Volts
3 Phase, 9 Lead Motor
Y-Connection
Ground B
J-10
T-5
Ground A
Link A
Link B
Low Voltage
Line
L2
L1
Ground A
Link A & B
L1
L2
Line
Ground B
T-5
J-10
Fan
Motor
Damper
Motor*
Second
Damper
Motor
Transformer** Transformer**
L3
L2
L1
Typical Damper Motor Schematic
For 3 phase, damper motor voltage should be the same between L1and L2. For single phase application, dis-
regard 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.

4
d. Ensure pulleys are properly aligned. Refer to Figure 4.
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley
setscrew and by moving the motor pulley on the motor shaft.
Figure 4 indicates where to measure the allowable gap for
the drive alignment tolerance. All contact points (indicated
by WXYZ) are to have a gap less than the tolerance shown
in the table. When the pulleys are not the
same width, the allowable gap must be
adjusted by half of the difference in width
(As shown in A & B of Figure 4). Figure 5
illustrates using a carpenter’s square to
adjust the position of the motor pulley until
the belt is parallel to the longer leg of the
square.
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.
Start 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 squeal-
ing).
• Improper motor amperage or voltage.
Figure 4
Tolerance
Center
Distance
Maximum
Gap
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
ZB
CENTER
DISTANCE
(CD)
GAP GAP
NOTICE! 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).
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. Chang-
ing 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.
NOTICE! Do not allow the fan to run in the wrong
direction. This will overheat the motor and cause seri-
ous 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.
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 effi-
ciency and possible damage can occur.
Do not change the pulley pitch diameter to change ten-
sion. 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 approxi-
mately 1/4” per foot of center distance should be
obtained by firmly pressing the belt. Refer to figure 3.
c. Lock the motor plate adjustment bolts in place.
Airfoil Backward
Inclined
1 foot
1/4 inch
Figure 3
Figure 5

5
• Inspect springs and rubber isolators for deterioration
and replace as needed.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling. Removing dirt from the wheel
and housing prevent imbalance and damage.
Lubrication - Fan Bearings
Greasable fan bearings are lubricated through a grease
fitting on the bearing and should be lubricated by the
schedule, Lubrication Conditions Chart.
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.
Before lubricating, the grease nipple and immediate
vicinity should be thoroughly cleaned without the use of
high pressure equipment. The grease should be supplied
slowly as the bearing rotates until fresh grease slips past
the seal. Excessive pressure should be avoided to prevent
seal damage.
In the event the bearing cannot be seen, use no more
than three injections with a hand-operated grease gun.
Exceptions to the greasing interval chart:
• Periodic Applications (any break of one week or
more): it is recommended that full lubrication be performed
prior to each break in operation.
• Higher Temperature: it is recommended to halve the
intervals for every 30F increase in operating temperature
above 120F not to exceed 230F for standard bearings;
High Temperature bearings (optional) can operate up to
400F.
• Vertical Shaft: it is recommended that the intervals
should be halved.
Loren Cook Company uses petroleum lubricant in a lith-
ium 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 tempera-
ture range is from -30F to +200F and capable of intermit-
tent highs of +250F.
Lubrication - Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Motor bearings without provisions for relubrication will
NOTICE! If a problem is discovered, immediately
shut the fan off. Lock out all electrical power and
check for the cause of the trouble. See Trouble-
shooting.
Inspection
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 mount-
ing 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 con-
ditions and location of the fan.
Inspect fans exhausting corrosive or contaminated air
within the first month of operation. Fans exhausting con-
taminated air (airborne abrasives) should be inspected
every three months.
Regular inspections are recommended for fans exhaust-
ing 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 imme-
diately.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. Refer
to Belt and Pulley Installation, page 4.
• Bearings should be inspected as recommended in the
Conditions Chart.
• Inspect variable inlet vanes for freedom of operation
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.
• Inspect isolation base for freedom of movement.
Recommended Torque for Setscrews/Bolts (IN/LB.)
Setscrews
Hold Down Bolts
Size
Key Hex
Across
Flats
Recommended
Torque
Min. Max. Size Wrench
Torque
No.10 3/32” 28 33 3/8”-16 240
1/4” 1/8” 66 80 1/2”-13 600
5/16” 5/32” 126 156 5/8”-11 1200
3/8” 3/16” 228 275 3/4”-10 2100
7/16” 7/32” 348 384 7/8”- 9 2040
1/2” 1/4” 504 600 1”- 8 3000
5/8” 5/16” 1104 1200 1-1/8” - 7 4200
3/4” 3/8” 1440 1800 1-1/4” - 7 6000
Lubrication Conditions Chart
Fan Class Fan Status Shaft Size Maximum Interval
(operational hrs)
Centrifugal Blower
Class I
Normal Conditions
(Clean, Dry & Smooth)
> 1-1/2” 10,000
< 1-1/2” 2,000
Extreme Conditions
(Dirty/Wet/Rough)
> 1-1/2” 2,000
< 1-1/2” 400
Centrifugal Blower
Class II
Normal Conditions
(Clean, Dry & Smooth)
> 2” 7,500
< 2” 1,000
Extreme Conditions
(Dirty/Wet/Rough)
> 2” 1,500
< 2” 200
Centrifugal Blower
Class III
Normal Conditions
(Clean, Dry & Smooth)
> 2” 3,000
< 2” 500
Extreme Conditions
(Dirty/Wet/Rough)
> 2” 500
< 2” 100

6
operate up to 10 years under normal conditions with no
maintenance. In severe applications, high temperatures or
excessive contaminates, it is advisable to have the mainte-
nance department disassemble and lubricate the bearings
after 3 years of operation to prevent interruption of service.
For motors with provisions for relubrication, follow inter-
vals of the following table.
Motors are provided with a polyurea mineral oil NGLI #2
grease. All additions to the motor bearings are to be with a
compatable grease such as Exxon Mobil Polyrex EM and
Chevron SRI.
The above intervals should be reduced to half for vertical
shaft installations.
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 representa-
tive.
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
key, if equipped.
b. Turn the pulley rim to open or close the groove facing.
If the pulley has multiple grooves, all must be adjusted
to the same width.
c. After adjustment, inspect for proper belt tension.
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.
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.
Relubrication Intervals
Service
Conditions
NEMA Frame Size
Up to and
including 184T 213T-365T 404T and larger
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
1800 RPM
and less
Over 1800
RPM
Standard 3 yrs. 6 months 2 yrs. 6 months 1 yr. 3 months
Severe 1 yr. 3 months 1 yr. 3 months 6 months 1 months
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
imperfections 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 bear-
ing 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
thoroughly.
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 swiv-
els in the housing to compensate for misalign-
ment. 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.
Max Class Speeds of PLC
Size Class I Class II Class III
120 4,165 4,768 -
135 3,642 4,137 -
150 3,232 3,669 -
165 2,800 3,289 -
180 2,532 2,980 4,101
195 2,291 2,722 3,682
210 2,103 2,504 3,333
225 1,939 2,317 3,062
245 1,759 2,112 2,732
270 1,527 1,895 2,400
300 1,346 1,685 2,233
330 1,276 1,558 1,984
365 1,144 1,392 1,772
402 1,091 1,286 1,604
445 965 1,149 1,484
490 885 1,031 1,306
540 782 929 1,190
600 738 843 1,084
660 650 753 959
730 576 658 834

7
1
2
4
3
5
6
7
PLC Parts List - Arrangement 3
4
l
3
2
1
Part
No.
Description
Sizes
1 Shaft
2 Drive Side Bearing
3 Housing
4 Wheel
5 Inlet Cone
6 Extended Lube Line
7 Inlet Side Bearing
Troubleshooting
Problem and Potential Cause
Low Capacity or Pressure
•Incorrect direction of rotation. Make sure the fan rotates in same direc-
tion 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 direc-
tion 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 direc-
tion 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.
r. Test run and retighten all setscrews and bolts. Trim
balance 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.
PLC-D Parts List
Part
No.
Description
Sizes
1 Inlet Cone
2 Wheel
3 Motor
4 Motor Base

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2
3
4
5
6
7
8
9
10
11
12
13
1
23
4
5
6
7
8
9
10
11
12
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Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
lorencook.com
PLC IOM - March 2011
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, mis-
used, 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.
PLC Parts List - Arrangement 3V
6
1
2
3
4
5
12
11
10
8
Part
No.
Description
Sizes
1 Shaft
2 Drive Side Bearing
3 Housing
4 Wheel
5 Inlet Cone
6 Extended Lube Line
7 Inlet Side Bearing
8 Motor Base
9 Motor
10 Motor Sheave
11 Belt Set
12 Fan Sheave
PLC Parts List - Arrangement 3T
Part
No.
Description
Sizes
1 Shaft
2 Drive Side Bearing
3 Housing
4 Wheel
5 Inlet Cone
6 Extended Lube Line
7 Inlet Side Bearing
8 Motor Base
9 Motor
10 Motor Sheave
11 Belt Set
12 Fan Sheave
13 Removeable Cross Brace
PLC Parts List - Arrangement 3S
Part
No.
Description
Sizes
1 Shaft
2 Drive Side Bearing
3 Housing
4 Wheel
5 Inlet Cone
6 Extended Lube Line
7 Inlet Side Bearing
8 Motor Mounting Pedestal
9 Motor Slide Base
10 Motor
11 Motor Sheave
12 Belt Set
13 Fan Sheave