COOK CP User Manual
CA/CF/CP
Centrifugal Blowers
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation and
maintenance instructions for standard units of the CA, CF,
and CP Centrifugal Blowers.
• CA / CF SWSI • CA DWDI
• CA-4 SWSI • CA-4 DWDI
• CPFD • CPFB
• CAF-DW
• CPA / CPA-A / CPS / CPS-A / CPV
Carefully read this publication and any
supplemental documents prior to any
installation or maintenance procedure.
Loren Cook Company’s catalog CA/CF & CP provides
additional information describing the equipment, fan
performance, available accessories, and specification data.
For additional safety information, refer to AMCA
publication 410-96, Safety Practices for Users and Installers
of Industrial and Commercial Fans.
All of the publications listed above can be obtained from
Loren Cook Company by phoning (417)869-6474, extension
166; by FAX at (417)832-9431; or by e-mail at
info@lorencook.com.
For information on special equipment, contact Loren Cook
Company Customer Service Department at (417)869-6474.
Handling
Lift the fan by the base or lifting eyes. NOTICE! Never lift
by the shaft, motor, or housing.
Storage
If the fan is stored for any length of time prior to
installation, completely fill the bearings with grease or
moisture-inhibiting oil (refer to Lubricants on page 6).
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.
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 inlet and outlet to prevent the accumulation of
dirt and moisture in the housing.
• Periodically rotate the wheel and operate dampers (if
supplied).
• Periodically inspect the unit to prevent damaging
conditions.
Rotating Parts & Electrical Shock Hazard:
Disconnect electric power before working on unit.
Follow proper lockout / tagout procedures to ensure
the unit cannot be energized while being installed or
serviced.
A disconnect switch should be placed near the fan in
order that the power can be swiftly cut off, in case of
an emergency and in order that maintenance
personnel are provided complete control of the power
source.
Grounding is required. All field-installed wiring must
be completed by qualified personnel. All fieldinstalled wiring must comply with National Electric
Code (NFPA 70) and all applicable local codes.
Failure to follow these instructions could result in
death or serious injury.
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 delivery receipt any visible sign of
damage.
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.
CA SWSI
The attachment of roof mounted fans to the roof curb
as well as the attachment of roof curbs to the building
structure must exceed the structural requirements
based on the environmental loading derived from the
applicable building code for the site. The local code
official may require variations from the recognized
code based on local data. The licensed engineer of
record will be responsible for prescribing the correct
attachment based on construction materials, code
requirements and environmental effects specific to
the installation.
Failure to follow these instructions could result in
death or serious injury.
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 unit and its motor.
Isolation
NOTICE! Although a certain amount of vibration is
inherent in operating centrifugal fans, extreme
vibration is a serious problem that may cause
structural and mechanical failure.
Isolation Base: To prevent vibration and noise from being
transferred to the building isolators are recommended.
Arrangement 1, 2, & 3 (CA or CF) fans require an isolation
base to effectively isolate the fan system which includes the
fan, base, motor, drive, guards, etc. Bases must have
sufficient rigidity to resist belt pull and prevent drive
distortion which can lead to excessive belt and bearing
wear; its perimeter should contain all base angles and
rotating parts. Arrangement 9 or 10 fans (CA, CF, and CP)
above size 270 require isolation rails. Please consult
factory for isolation of arrangement 9 fans due to the
potential of uneven loading caused by the motors and
drives. Isolators should be located between the fan system
and the support structure.
Ceiling Mounted Isolators: Some applications require fan
systems designed for floor mounting to be suspended from
ceiling supports. In such cases, all CA, CF, or CP fans of all
arrangements should be installed on either rails or bases in
the classical orientation. Typically, these systems are hung
from the corners by rods, which include isolation hangers of
either spring or rubber-in-shear design. NOTICE! Under no
circumstances is the fan to be inverted and hung by its
base angles.
Ceiling Mounted Spring Isolator
Figure 1 - Ceiling Mount Isolators
Rubber-In-Shear Ceiling Isolators
Floor Mounted Spring Isolators
1. Mount fan and motor on isolation base (if supplied).
2. Elevate fan (or isolation base) to operating height and
insert blocks to hold in position.
3. Position isolators under the fan 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.
4. 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.
5. Turn lock nut onto leveling bolt and secure firmly in
place against the top of the mounting flange or frame.
6. Secure isolators to mounting surface.
Spring Isolator
Figure 2 -Floor Mount Isolators
Rubber-In-Shear Isolator
Floor Mounted Rubber-In-Shear (RIS) Isolators
1. Mount fan and motor on an isolation base (if supplied).
2. Elevate fan to provide room to insert isolators between
the base and foundation and block in position.
3. Position isolators under fan and secure bolts.
4. Remove blocks and allow fan to rest on floor. Isolators
must be installed on a level surface (leveling should
not be required).
5. Secure isolators to mounting surface.
2
Duct Installation
Efficient fan performance relies on the proper installation
of inlet and discharge ducts. Be sure your fan conforms to
the following guidelines.
Non-Ducted Inlet Clearance: If your fan has an open inlet
(no duct work), the fan must be placed 1 fan wheel
diameter away from walls and bulkheads.
Non-ducted Inlet
Clearance
MIN 1 DIA
The installation diagram below has a solid curb cap duct
adapter placed over the top of the curb. The welded grease
duct with recommended transition is either welded or
sealed with UL recognized fire caulk to both the curb cap
duct adapter and the bottom of the fan. A minimum of two
separate outlines of caulk is recommended at the outer
portion of the curb cap duct adapter.
Free Discharge: Avoid a free discharge into the plenum.
This will result in lost efficiency because it doesn’t allow for
a static regain.
Correct
Free Discharge
Incorrect
Inlet Duct Turns: For ducted inlets, allow at least 3 fan
wheel diameters between duct turns or elbows and the fan
inlet.
MIN 3
Correct
Incorrect
Inlet Duct Turns
DIA
Discharge Duct Turns: Where possible, allow 3 duct diameters between duct turns or elbows and the fan outlet. Refer
to figure above.
MIN 3
DIA
Correct
Discharge Duct Turns
Incorrect
CP with Optional Curb Cap & Inlet Box
UL 762 / NFPA96 and local codes may dictate
additional or modifications to this installation.
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.
CA, CF, & CP
Size Overlap
60 - 165 3/16”
180 - 245 1/4”
270 - 300 5/16”
330 - 365 3/8”
402 7/16”
445 - 490 1/2”
540 - 730 13/16”
CAF-DW
Size Overlap
120
135 - 165
180
195
210
225
245
270 - 445
490 17/32”
540 - 600
660 - 730
1/8”
5/32”
1/4”
5/32”
1/4”
5/32”
9/32”
1/4”
27/32”
25/32”
3
1 foot
1/4 inch
Wiring Installation
NOTICE! 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.
(See page 5 for diagram)
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.
Units with Arrangement 10 have a hole provided at the
base of the bearing pedestal to accommodate wiring.
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).
tension. This will result in a different fan speed than desired.
1. Loosen motor plate adjustment nuts on L-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.
2. 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 obtained by firmly pressing the belt. Refer to
Figure 3.
3. Lock the motor plate adjustment nuts in place.
4. Ensure pulleys are properly aligned. Refer to Figure 4.
Tolerance
Center
Distance
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Maximum
Gap
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
CENTER
DISTANCE
(CD)
Airfoil
Backward Inclined
Forward Curved
Wheel Rotation
Test the fan to ensure the
rotation of the wheel is the
same as indicated by
the arrow marked
Rotation.
For 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.
For 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 above 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
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.
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
Figure 3
Figure 4
Z
B
GAP
GAP
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
Figure 5
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
1. Inspect fasteners and setscrews, particularly fan
mounting and bearing fasteners, and tighten according
to the recommended torque shown in the following
table.
2. Inspect for correct voltage with voltmeter.
3. Ensure all accessories are installed.
Recommended T orque for Setscrews & Hold Down Bolts
Setscrews Hold Down Bolts
Key
Size
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
4
Hex
Across
Flats
Recommended
Torque
(inch/lbs)
Min. Max.
Size
Wrench Torque
(inch/lbs)
Operation
Pre-Start Checks
1. Lock out all the primary and secondary power
sources.
2. Ensure fasteners and setscrews, particularly those
used for mounting the fan, are tightened.
3. Inspect belt tension and pulley alignment.
4. Inspect motor wiring.
5. Ensure belt touches only the pulleys.
6. Ensure fan and ductwork are clean and free of debris.
7. Inspect wheel-to-inlet clearance. The correct wheelto-inlet clearance is critical to proper fan performance.
8. Close and secure all access doors.
9. 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
squealing).
• Improper motor amperage or voltage.
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 Troubleshooting.
Wiring Diagrams
Single Speed, Single Phase Motor
Ground A
L
T-1
T-4
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.
2 Speed, 2 Winding, Single Phase Motor
Ground A
T-1
T-4
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-1 and T-4 leads.
Single Speed, Single Phase, Dual Voltage
Ground A
L
Line
L
1
2
T-5
J-10
Ground B
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.
Link A
Link B
Low Voltage
Typical Damper Motor Schematic
Fan
Motor
Transformer**
Line
L
T-5
J-10
Ground B
1
2
High Speed
L
1
L
2
Low Speed
Ground A
L3
L2
L1
Transformer**
Line
L
Line
L
1
2
Link A & B
For 3 phase, damper motor voltage should be the same between L1 and
L2. For single phase application, disregard L3. *Damper motors may be
available in 115, 230 and 460 volt models. The damper motor nameplate
voltage should be verified prior to connection. ** A transformer may be provided in some installations to correct the damper motor voltage to the
specified voltage.
Wiring Diagrams
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
1
728
To reverse, interchange any 2 line leads.
3
9
L2L
L
3
1
High Voltage
460 Volts
456
789
12
L2L
L
1
2 Speed, 1 Winding, 3 Phase Motor
High Speed
1
Together
2
Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
3
L
4
1
L
5
2
6
Line
L
3
2 Speed, 2 Winding, 3 Phase
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
line leads.
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
8
7
4
6
2
1
3
L
1
3
L
2
Low Speed
Motor
L
High Voltage
9
5
3
3
1
2
3
4
5
6
460 Volts
789
456
12
L
1
L
1
L
2
Line
L
3
Open
3
L
L
3
2
Damper
Motor*
Second
Damper
Motor
5
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