COOK CP-BK User manual

4
CP-BK
2015 E. DALE STREET
SPRINGFIELD, MO 65803-4637
417.869.6474
FAX [phone]
lorencook.com
BK Broiler Exhaust Fan - February 2002

Counter Clockwise Rotation Shown, Rectangular Base
with Curb Cap, Inlet Plenum, Discharge Stack and Stand
27 1/8" Outside
48 1/2" Outside
Discharge
Stack
Inlet
Plenum
Existing
Curb
Data
120 CP-BK
3
2
120 CP-BK
CFM OV
FPM
0.250 SP 0.500 SP 0.750 SP 1.000 SP 1.250 SP 1.500 SP 1.750 SP 2.000 SP 2.250 SP 2.500 SP
RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP RPM BHP
500 961 802 .03 1018 .07 1220 .11 1396 .15
600 1154 879 .04 1060 .08 1243 .12 1413 .17 1567 .22 1708 .27
700 1346 953 .06 1128 .09 1280 .14 1437 .19 1586 .24 1724 .30 1852 .35 1973 .42
800 1538 1017 .07 1205 .11 1340 .16 1474 .21 1612 .27 1745 .33 1871 .39 1989 .45 2101 .52 2208 .59
900 1730 1076 .09 1282 .14 1414 .19 1532 .24 1651 .30 1773 .36 1894 .42 2010 .49 2120 .56 2225 .63
1000 1923 1150 .11 1355 .16 1492 .22 1603 .27 1708 .33 1815 .40 1925 .46 2035 .54 2143 .61 2245 .68
1100 2115 1234 .13 1420 .19 1568 .25 1680 .31 1779 .37 1874 .44 1971 .51 2071 .58 2171 .66 2271 .74
1200 2308 1321 .16 1476 .22 1642 .28 1758 .35 1855 .42 1945 .49 2033 .56 2121 .64 2211 .71 2303 .80
1300 2500 1410 .19 1539 .25 1710 .33 1833 .40 1933 .47 2021 .54 2104 .62 2184 .69 2265 .78 2347 .86
1400 2692 1501 .23 1615 .29 1769 .37 1906 .45 2009 .52 2099 .60 2180 .68 2257 .76 2332 .84 2406 .93
1500 2885 1592 .27 1697 .34 1826 .42 1973 .50 2084 .58 2175 .66 2258 .75 2333 .83 2405 .92 2475 1.01
1600 3077 1683 .32 1783 .39 1891 .47 2033 .56 2155 .65 2251 .73 2335 .82 2411 .91 2482 1.00
1700 3269 1776 .37 1871 .45 1966 .53 2089 .62 2221 .71 2324 .81 2410 .90 2488 1.00
1800 3462 1868 .43 1960 .51 2048 .60 2151 .69 2280 .79 2393 .89 2484 .99
1900 3654 1961 .50 2050 .58 2132 .67 2222 .76 2336 .86 2456 .97
2000 3846 2055 .57 2141 .66 2219 .75 2299 .84 2397 .95 2513 1.06
2100 4038 2148 .65 2232 .75 2307 .84 2382 .94 2467 1.04
2200 4231 2241 .74 2323 .84 2397 .94 2468 1.04
2300 4423 2337 .83 2415 .94 2486 1.04
2400 4615 2431 .94 2508 1.05
Performance shown is for Installation Type B: Free Inlet, Ducted Outlet. Power rating (BHP) does not include drive losses. Performance ratings do not include the
effects of appurtenances in the airstream. *Outlet velocity (OV) in feet per minute (FPM) at discharge stack.
Wheel Diameter - 12”
Wheel Type - Flatblade
Tip Speed (FPM) = 3.21 x RPM
Max. BHP = .068 x (RPM/1000)
3
Plenum Inlet Area = 1.95 Sq. Ft.
Outlet Area = .52 Sq. Ft.
Outlet Velocity* (FPM) = CFM/.52
Max. Motor Frame - 184T, Arr. 10
Approx. Ship Wt. - 270 lbs. with
motor and drives as complete unit.
CP-BK
Information
Flow (CFM)
Static Pressure (In W.G.)
0600 1200 1800 2400 3000
2.5
2.0
1.5
1.0
0.5
0
2527 RPM
.334 HP
802 RPM
.5 HP
2350 RPM
.75 HP
2150 RPM
1 HP
1950 RPM
1.5 HP
1750 RPM
1550 RPM
1400 RPM
1200 RPM
•Acustom Cook CP continuously welded steel, arrangement
10 utility set.
•Exhaust fan package is factory assembled, balanced and
test run.
•Curb mounted inlet plenum designed for maximum effi-
ciency and minimal static pressure loss.
• Discharge stack to assure high velocity exhaust plume.
•Tested for continuous operation at 500˚F.
•Listed for both UL 705 (Safety Standard for Power Ventila-
tors) and UL 762 (Power Roof Ventilators for Restaurant
Exhaust Appliances).
•Features an “Easy Clean” finish utilizing a durable, high
temperature, non-stick cookware coating.
•Easy access for cleaning to inlet plenum and ductwork with
quick release latches and large removable panel.
•Easy access to fan wheel with hinged discharge stack quick
release latch.
•Aluminum grease trough is positioned directly under fan
drain and is easily removable for cleaning. Grease trough
includes rainwater overflow feature.
•Adjustable aluminum legs to support fan at NFPA 96
required discharge height.
• Curb cap and support legs designed to fit existing BK curb.
•All bolted connections sealed with a durable silicone adhe-
sive material rated for 600˚F continuous operation.
•Quick release inspection panels on power assembly hous-
ing allow inspection of motor and belts without removing
weather cover.
• Lifting lugs are provided for safe installation.
• Roof penetration is sealed from the elements.

8
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
www.lorencook.com
CP-BK IOM - April 2002
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.
Centrifugal Blowers
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
CP-BK
CP-BK
• Periodically rotate the wheel.
• Periodically inspect the unit to prevent damaging condi-
tions.
Installation
Motor Installation
Most motors are shipped mounted on the fans with belts
and drives installed. However, extremely heavy motors and
drives are shipped separately. These motors and drives will
require field installation. Please refer to pages 4.
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.
ITEM
NO. DESCRIPTION
VENTURI STACK
CURB CAP W/PLENUM INLET BOX
SIDE PEDESTAL COVER
MOTOR MOUNT
MOTOR
HOUSING COVER
BEARINGS (2)
SHAFT - 1"
WEATHER COVER FRONT
WEATHER COVER CAP
WHEEL (STEEL W/ALUMINUM HUB)
INLET CONE - ALUMINUM (W/O FLANGE)
WHEEL HOUSING
PEDESTAL WELDMENT
14
13
12
11
10
9
8
7
6
5
4
3
2
1
CP-BK Parts List
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 condition.
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.
•Missing heat shield from inside pedestal.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
•Missing heat shield from inside pedestal.
This publication contains the installation, operation
and maintenance instructions for standard units of the
CP-BK Kitchen Exhaust Fan .
• CP-BK
Carefully read this publication prior to any installa-
tion or maintenance procedure.
Loren Cook catalog, CP, 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 417/869-6474, extension
166; by FAX at 417/832-9431; or by e-mail at info@loren-
cook.com.
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 damage
and shortage immediately upon receipt of the fan.
• Turn the wheel by hand to ensure it turns freely and
does not bind.
• Record on the Delivery Receipt any visible sign of dam-
age.
Handling
Lift the fan by the lifting eyes. Never lift by the shaft,
motor, or housing.
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
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 com-
pound.
• Wrap bearings for weather protection.
• Cover the inlet and outlet to prevent the accumulation of
dirt and moisture in the housing.
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.

Arrangement 10
a. Mark the position on the shaft of both bearing races,
setscrews, and the wheel and pulley. Mark the location
and orientation of the inlet cone. Note the clearance
between the wheel and inlet cone.
b. Remove the fan pulley.
c. Remove the inlet cone.
d. Remove the wheel from the shaft. A 2-jaw puller may
be needed.
e. Remove bearing hold-down bolts. Remove shaft and
bearings as one unit.
f. Remove the anti-corrosion coating from the shaft with
a suitable solvent.
g. 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.
h. Smooth and clean the shaft and bearing bore thor-
oughly.
i. 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.
j. 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 .
k. Align the setscrews on the bearings and tighten one
setscrew on each bearing.
l. Rotate the shaft to allow the bearing outer rings to
find their center of free movement.
m. Install the wheel on the shaft. Install the inlet cone in
its original location. And adjust bearing position and
inlet cone to center the wheel in the inlet cone.
n. Tighten hold-down bolts to proper torque.
o. Tu rn the shaft by hand. Resistance should be the
same as it was before hold-down bolts were fully tight-
ened.
p. Tighten bearing setscrews to specified torque. Refer
to Torque chart.
q. Re-install the pulley and 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.
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. Tu rn 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 and
shafts.
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.
An emery cloth or file may be needed to remove imper-
fections in the shaft left by the setscrews.
Maximum RPM
CP-BK
Maximum RPM
Class
I
120 2527
1 foot
1/4 inch
Figure 3
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 Wir-
ing Diagrams above 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 direc-
tion, check the control switch. It is possible to inter-
change 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 efficiency 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 nuts on 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. Adjust the motor plate until proper tension is reached.
For proper tension a deflection of approximately 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 nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 4 .
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 move-
ment 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.
Units with Arrangement 10 have a hole provided at the
base of the bearing pedestal to accommodate wiring.
Follow the wiring diagram for the disconnect switch
(Pages 4 & 5) 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/INLET
WHEEL/INLET
OVERLAP
VERLAP
RADIAL
RADIAL
CLEARANCE
CLEARANCE
OVERLAP
VERLAP
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.
7
2
Backward Inclined
Size Overlap
120 5/8”

Pulley Alignment
Pulley alignment is adjusted by loosening the motor pul-
ley setscrew and by moving the motor pulley on the motor
shaft or by moving the entire motor along the motor mount-
ing bracket.
Figure 4 illustrates correct and incorrect pulley alignment.
A recommended method of inspecting the pulley alignment
with a square is shown below in Figure 5 .
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 Rec-
ommended 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.
Correct Incorrect
Incorrect Incorrect
Figure 4
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
Tu rn 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.
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
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.
Recommended Torque for Setscrews/Bolts (IN/LB.)
Setscrews
Hold Down Bolts
Size Key Hex
Across Flats
Recommended Torque
Inch-lbs.
Min. Max. Size Wrench Torque
(inch-lbs)
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
3
6
Conditions Chart
RPM Temperature Fan Status Greasing Interval
100 Up to 120˚F Clean 6 to 12 months
500 Up to 150˚F Clean 2 to 6 months
1000 Up to 210˚F Clean 2 weeks to 2 months
1500 Over 210˚F Clean Weekly
Any Speed Up to 150˚F Dirty 1 week to 1 month
Any Speed Over 150˚F Dirty Daily to 2 weeks
Any Speed Any Temperature Very Dirty Daily to 2 weeks
Any Speed Any Temperature Extreme
Conditions Daily to 2 weeks
Current Switch Set-UP
General Notes:
1. The current sensor is preset at factory.
2. The sensor is designed to shut down the broiler in the
event that the motor current drops below normal. This
will reflect a problem such as a broken belt.
3. Current sensor shall be enclosed in a (UL Listed for
Outdoor Use) conduit box. Wire shall be ran through
(UL Listed for Outdoor Use) conduit and connectors.
Notes for Current Sensor:
1. Typical operation: Line voltage applied continuously.
After seven seconds of fault, relay trips. If current is
below set point, red LED will light. Current window is
adjustable between 1-10 amps. Adjustments are inde-
pendent.
2. Typical setup: Adjust undercurrent pot to minimum,
clockwise is maximum. Apply current. Once current has
stabalized, adjust undercurrent pot by turning up until red
LED lights. Then turn down within seven seconds until red
light turns off. If a light remains on for more than ten sec-
onds, disconnect supply voltage to reset. Fault window var-
ies by how far the pots are adjusted. Now if a fault occurs
for greater than seven seconds, the relay will trip until sup-
ply voltage is removed.
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 contam-
inated 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 immedi-
ately.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. See
Belt and Pulley Installation , page 3.
• Bearings should be inspected as recommended in the
Conditions Chart .
• 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.
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 con-
forming 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.
Motor Bearings
Motor bearings are pre-lubricated and sealed. Under nor-
mal 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 opera-
tion 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 sched-
ule, 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.
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 representa-
tive.
Figure 5Figure 5

4 5
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
T3
T2
T
1
T
11
T
12
T
13
Motor
L1
L2
L3
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
456
1
72 83
9
L1L2L3
456
789
12 3
L1L2L3
Low Voltage
208/230 Volts High Voltage 460 Volts
3 Phase, 9 Lead Motor
Y-Connection
7
1
6789
456
12 3
Low Voltage
208/230 Volts High Voltage 460 Volts
8
2
49
3
5
L1L3
L2
L1L3
L2
3 Phase, 9 Lead Motor
Delta-Connection
WIRE MUST MAKE ONE
FULL LOOP THROUGH
SENSOR COIL AS INDICATED
REMOVABLE
WEATHER
COVER
REMOVABLE
BELT GUARD
PLASTIC COVER
IS SEALED WITH
NEOPRENE GASKET
REMOVABLE
PEDESTAL
MOTOR
ACCESS
DOOR
POWER SOURCE
FROM STORE
SHOWN OPEN WITHOUT
PLASTIC COVER
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
To reverse, interchange any 2 line leads.
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 2 Speed, 1 Winding, 3 Phase Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
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 T
11
and T
12
.
Low Speed-interchange leads T
1
and T
2
. Both Speeds-interchange any 2
line leads.
T-1
T-4
Ground B
L2
L1
Ground A
Line
Ground A
Ground B
T-1
T-4
Low Speed
High Speed
L1
L2Line
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
Wiring Diagrams Continued
Wiring Diagrams
AT THE MACHINE ON THE ROOF CURRENT
SENSOR
12345
LOOP
ONCE
RED LED
FAN MOTOR
NEUTRAL
HOT HOT
NEUTRAL
FAN DISCONNECT
INSIDE THE STORE
BROILER CONTACTOR
HOT
NEUTRAL
FAN MAIN SWITCH
NEUTRAL NEUTRAL
HOT HOT
208 VOLTS
SINGLE PHASE
ADJUSTMENT POTS
Current Switch Set-Up Diagram (Sensor Wiring ONLY)
ITEM QTY. P/N DESCRIPTION
15 AS REQD - WIRE, BLK, GRN, WHT 14 AWG. 19 STRAND, ANY TYPE, THHN, THWN, MTW, AWN
14 2 125300 WIRE CONNECTOR (WIRE NUT)
13 6 137320 SPEED SCREW, HEX WASHER HEAD, BSD TYPE
12 2 137548 6-32, WIZZNUT
11 2 137485 6-32 X 1 1/2, COUNTERSUNK FLATHEAD MACHINE SCREW
10 4 125334 LOCKING FORK TERMINAL
91 132408 2-POLE SINGLE CURRENT SWITCH, 120-277 VOLT, 20 AMP
84 125312 SINGLE-WIRE FEMALE FLAG QUICK CONNECT
71 132115 CURRENT SENSOR, 208 VOLT, 10 AMP
61 125605 1/2” 90
O
ELBOW FITTING, LIQUID TIGHT, ZINC PLATED, CAST METAL
51 125645 1/2” STRAIGHT FITTING, LIQUID TIGHT, ZINC PLATED, CAST METAL
41 125105 LIQUID TIGHT, EF 1/2”, FLEXIBLE CONDUIT (OUTDOOR USE UL APPROVED)
31 125347 NEMA 4, JUNCTION BOX, 4” X 4” X 2” GREY, PVC (OUTDOOR USE UL APPROVED)
21 125416 NEMA 3, DISCONNECT SWITCH COVER
11 125415 NEMA 3, DISCONNECT SWITCH, 1/2” 3 HOLE, SINGLE GANG DEEP, CAST METAL

4 5
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
T3
T2
T
1
T
11
T
12
T
13
Motor
L1
L2
L3
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
456
1
72 83
9
L1L2L3
456
789
12 3
L1L2L3
Low Voltage
208/230 Volts High Voltage 460 Volts
3 Phase, 9 Lead Motor
Y-Connection
7
1
6789
456
12 3
Low Voltage
208/230 Volts High Voltage 460 Volts
8
2
49
3
5
L1L3
L2
L1L3
L2
3 Phase, 9 Lead Motor
Delta-Connection
WIRE MUST MAKE ONE
FULL LOOP THROUGH
SENSOR COIL AS INDICATED
REMOVABLE
WEATHER
COVER
REMOVABLE
BELT GUARD
PLASTIC COVER
IS SEALED WITH
NEOPRENE GASKET
REMOVABLE
PEDESTAL
MOTOR
ACCESS
DOOR
POWER SOURCE
FROM STORE
SHOWN OPEN WITHOUT
PLASTIC COVER
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
To reverse, interchange any 2 line leads.
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 2 Speed, 1 Winding, 3 Phase Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
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 T
11
and T
12
.
Low Speed-interchange leads T
1
and T
2
. Both Speeds-interchange any 2
line leads.
T-1
T-4
Ground B
L2
L1
Ground A
Line
Ground A
Ground B
T-1
T-4
Low Speed
High Speed
L1
L2Line
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
Wiring Diagrams Continued
Wiring Diagrams
AT THE MACHINE ON THE ROOF CURRENT
SENSOR
12345
LOOP
ONCE
RED LED
FAN MOTOR
NEUTRAL
HOT HOT
NEUTRAL
FAN DISCONNECT
INSIDE THE STORE
BROILER CONTACTOR
HOT
NEUTRAL
FAN MAIN SWITCH
NEUTRAL NEUTRAL
HOT HOT
208 VOLTS
SINGLE PHASE
ADJUSTMENT POTS
Current Switch Set-Up Diagram (Sensor Wiring ONLY)
ITEM QTY. P/N DESCRIPTION
15 AS REQD - WIRE, BLK, GRN, WHT 14 AWG. 19 STRAND, ANY TYPE, THHN, THWN, MTW, AWN
14 2 125300 WIRE CONNECTOR (WIRE NUT)
13 6 137320 SPEED SCREW, HEX WASHER HEAD, BSD TYPE
12 2 137548 6-32, WIZZNUT
11 2 137485 6-32 X 1 1/2, COUNTERSUNK FLATHEAD MACHINE SCREW
10 4 125334 LOCKING FORK TERMINAL
91 132408 2-POLE SINGLE CURRENT SWITCH, 120-277 VOLT, 20 AMP
84 125312 SINGLE-WIRE FEMALE FLAG QUICK CONNECT
71 132115 CURRENT SENSOR, 208 VOLT, 10 AMP
61 125605 1/2” 90
O
ELBOW FITTING, LIQUID TIGHT, ZINC PLATED, CAST METAL
51 125645 1/2” STRAIGHT FITTING, LIQUID TIGHT, ZINC PLATED, CAST METAL
41 125105 LIQUID TIGHT, EF 1/2”, FLEXIBLE CONDUIT (OUTDOOR USE UL APPROVED)
31 125347 NEMA 4, JUNCTION BOX, 4” X 4” X 2” GREY, PVC (OUTDOOR USE UL APPROVED)
21 125416 NEMA 3, DISCONNECT SWITCH COVER
11 125415 NEMA 3, DISCONNECT SWITCH, 1/2” 3 HOLE, SINGLE GANG DEEP, CAST METAL

Pulley Alignment
Pulley alignment is adjusted by loosening the motor pul-
ley setscrew and by moving the motor pulley on the motor
shaft or by moving the entire motor along the motor mount-
ing bracket.
Figure 4 illustrates correct and incorrect pulley alignment.
A recommended method of inspecting the pulley alignment
with a square is shown below in Figure 5 .
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 Rec-
ommended 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.
Correct Incorrect
Incorrect Incorrect
Figure 4
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
Tu rn 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.
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
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.
Recommended Torque for Setscrews/Bolts (IN/LB.)
Setscrews
Hold Down Bolts
Size Key Hex
Across Flats
Recommended Torque
Inch-lbs.
Min. Max. Size Wrench Torque
(inch-lbs)
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
3
6
Conditions Chart
RPM Temperature Fan Status Greasing Interval
100 Up to 120˚F Clean 6 to 12 months
500 Up to 150˚F Clean 2 to 6 months
1000 Up to 210˚F Clean 2 weeks to 2 months
1500 Over 210˚F Clean Weekly
Any Speed Up to 150˚F Dirty 1 week to 1 month
Any Speed Over 150˚F Dirty Daily to 2 weeks
Any Speed Any Temperature Very Dirty Daily to 2 weeks
Any Speed Any Temperature Extreme
Conditions Daily to 2 weeks
Current Switch Set-UP
General Notes:
1. The current sensor is preset at factory.
2. The sensor is designed to shut down the broiler in the
event that the motor current drops below normal. This
will reflect a problem such as a broken belt.
3. Current sensor shall be enclosed in a (UL Listed for
Outdoor Use) conduit box. Wire shall be ran through
(UL Listed for Outdoor Use) conduit and connectors.
Notes for Current Sensor:
1. Typical operation: Line voltage applied continuously.
After seven seconds of fault, relay trips. If current is
below set point, red LED will light. Current window is
adjustable between 1-10 amps. Adjustments are inde-
pendent.
2. Typical setup: Adjust undercurrent pot to minimum,
clockwise is maximum. Apply current. Once current has
stabalized, adjust undercurrent pot by turning up until red
LED lights. Then turn down within seven seconds until red
light turns off. If a light remains on for more than ten sec-
onds, disconnect supply voltage to reset. Fault window var-
ies by how far the pots are adjusted. Now if a fault occurs
for greater than seven seconds, the relay will trip until sup-
ply voltage is removed.
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 contam-
inated 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 immedi-
ately.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. See
Belt and Pulley Installation , page 3.
• Bearings should be inspected as recommended in the
Conditions Chart .
• 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.
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 con-
forming 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.
Motor Bearings
Motor bearings are pre-lubricated and sealed. Under nor-
mal 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 opera-
tion 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 sched-
ule, 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.
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 representa-
tive.
Figure 5Figure 5

Arrangement 10
a. Mark the position on the shaft of both bearing races,
setscrews, and the wheel and pulley. Mark the location
and orientation of the inlet cone. Note the clearance
between the wheel and inlet cone.
b. Remove the fan pulley.
c. Remove the inlet cone.
d. Remove the wheel from the shaft. A 2-jaw puller may
be needed.
e. Remove bearing hold-down bolts. Remove shaft and
bearings as one unit.
f. Remove the anti-corrosion coating from the shaft with
a suitable solvent.
g. 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.
h. Smooth and clean the shaft and bearing bore thor-
oughly.
i. 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.
j. 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 .
k. Align the setscrews on the bearings and tighten one
setscrew on each bearing.
l. Rotate the shaft to allow the bearing outer rings to
find their center of free movement.
m. Install the wheel on the shaft. Install the inlet cone in
its original location. And adjust bearing position and
inlet cone to center the wheel in the inlet cone.
n. Tighten hold-down bolts to proper torque.
o. Tu rn the shaft by hand. Resistance should be the
same as it was before hold-down bolts were fully tight-
ened.
p. Tighten bearing setscrews to specified torque. Refer
to Torque chart.
q. Re-install the pulley and 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.
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. Tu rn 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 and
shafts.
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.
An emery cloth or file may be needed to remove imper-
fections in the shaft left by the setscrews.
Maximum RPM
CP-BK
Maximum RPM
Class
I
120 2527
1 foot
1/4 inch
Figure 3
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 Wir-
ing Diagrams above 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 direc-
tion, check the control switch. It is possible to inter-
change 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 efficiency 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 nuts on 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. Adjust the motor plate until proper tension is reached.
For proper tension a deflection of approximately 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 nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 4 .
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 move-
ment 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.
Units with Arrangement 10 have a hole provided at the
base of the bearing pedestal to accommodate wiring.
Follow the wiring diagram for the disconnect switch
(Pages 4 & 5) 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/INLET
WHEEL/INLET
OVERLAP
VERLAP
RADIAL
RADIAL
CLEARANCE
CLEARANCE
OVERLAP
VERLAP
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.
7
2
Backward Inclined
Size Overlap
120 5/8”

8
Corporate Offices: 2015 E. Dale Street Springfield, MO 65803 417.869.6474
www.lorencook.com
CP-BK IOM - April 2002
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.
Centrifugal Blowers
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
CP-BK
CP-BK
• Periodically rotate the wheel.
• Periodically inspect the unit to prevent damaging condi-
tions.
Installation
Motor Installation
Most motors are shipped mounted on the fans with belts
and drives installed. However, extremely heavy motors and
drives are shipped separately. These motors and drives will
require field installation. Please refer to pages 4.
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.
ITEM
NO. DESCRIPTION
VENTURI STACK
CURB CAP W/PLENUM INLET BOX
SIDE PEDESTAL COVER
MOTOR MOUNT
MOTOR
HOUSING COVER
BEARINGS (2)
SHAFT - 1"
WEATHER COVER FRONT
WEATHER COVER CAP
WHEEL (STEEL W/ALUMINUM HUB)
INLET CONE - ALUMINUM (W/O FLANGE)
WHEEL HOUSING
PEDESTAL WELDMENT
14
13
12
11
10
9
8
7
6
5
4
3
2
1
CP-BK Parts List
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 condition.
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.
•Missing heat shield from inside pedestal.
Overheated Bearings
•Improper bearing lubrication
•Excessive belt tension.
•Missing heat shield from inside pedestal.
This publication contains the installation, operation
and maintenance instructions for standard units of the
CP-BK Kitchen Exhaust Fan .
• CP-BK
Carefully read this publication prior to any installa-
tion or maintenance procedure.
Loren Cook catalog, CP, 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 417/869-6474, extension
166; by FAX at 417/832-9431; or by e-mail at info@loren-
cook.com.
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 damage
and shortage immediately upon receipt of the fan.
• Turn the wheel by hand to ensure it turns freely and
does not bind.
• Record on the Delivery Receipt any visible sign of dam-
age.
Handling
Lift the fan by the lifting eyes. Never lift by the shaft,
motor, or housing.
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
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 com-
pound.
• Wrap bearings for weather protection.
• Cover the inlet and outlet to prevent the accumulation of
dirt and moisture in the housing.
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.