COOK CFS User Manual
CFS
Centrifugal Filtered Supply Fans
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation and
maintenance instructions for standard units of the CFS
Centrifugal Filtered Supply 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 catalog, CFS, provides additional information
describing the equipment, fan performance, available
accessories, and specification data.
For additional safety information, refer to AMCA publication 410-96, Safety Practices for Users and Installers of
Industrial and Commercial Fans.
All of the publications listed above can be obtained from
Loren Cook Company by phoning 417/869-6474, extension
166; by FAX at 417/832-9431; or by e-mail at info@lorencook.com.
For information on special equipment, contact Loren
Cook Company Customer Service Department at 417/869-
6474.
Rotating Parts & Electrical Shock Hazard:
Disconnect electric power before working on unit.
Follow proper lockout / tagout procedures to ensure
the unit cannot be energized while being installed or
serviced.
A disconnect switch should be placed near the fan in
order that the power can be swiftly cut off, in case of
an emergency and in order that maintenance
personnel are provided complete control of the power
source.
Grounding is required. All field-installed wiring must
be completed by qualified personnel. All fieldinstalled wiring must comply with National Electric
Code (NFPA 70) and all applicable local codes.
Failure to follow these instructions could result in
death or serious injury.
lifting eyes on the housing. NOTICE! Never lift by the
shaft, motor, or tiers.
Storage
If the fan is stored for any length of time prior to installation, completely fill the bearings with grease or moistureinhibiting oil (refer to Lubricants on page 5). Rotate the
wheel several revolutions every three to five days to keep a
coating of grease on all internal bearing parts.
Store the fan in its original crate and protect it from dust,
debris and the weather.
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.
Installation
Motor Installation
Most motors are shipped 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 page 4.
Duct Installation
Efficient fan performance relies on the proper installation
of inlet and discharge ducts. Be sure your fan conforms to
the following guidelines.
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 remove the lid and lift by the
CFS
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
Incorrect
Discharge Duct Turns
Where possible, allow 3 duct diameters between duct
turns or elbows and the fan outlet. Refer to Discharge Duct
Turns drawing on Page 2.
Correct
MIN
3 DIA.
Wheel-to-Inlet Clearance
The correct wheel-to-inlet clearance is critical to proper
fan performance. This clearance should be verified before
initial start-up since rough handling during shipment could
cause a shift in fan components. Refer to wheel/inlet drawing for correct overlap.
Adjust the overlap by
loosening the wheel hub
and moving the wheel along
the shaft to obtain the correct value.
A uniform radial gap
(space between the edge of
the cone and the edge of
the inlet) is obtained by
loosening the inlet cone
bolts and repositioning the
inlet cone.
Size Overlap
100 - 165 3/16”
180 - 245 1/4”
270 - 300 5/16”
Incorrect
Damper and Curb Installation
a. Minimum roof opening dimensions can be found
within the CFS catalog.
b. The optional duct adapter fits on the curb to locate the
top of the duct before the fan is installed. Ductwork
requires additional support.
c. The typical damper try (optional) extends below the
curb top 38 inches. A clear 17-1/2 inches is required
to access the damper tray panel (see drawing above).
Should a longer damper tray be required, extended
lengths are available.
NOTICE! It may be necessary to add support beneath
the load carrying sides of the blower and curb.
Duct Adapter
Damper and Curb Installation Components
Damper Tray
Minimum
Roof Opening
Motorized
Intake Damper
330 - 365 3/8”
Use of Variable Frequency Drives
Motors -
Motors that are to be operated using a Variable Frequency Drive (VFD) must be VFD compatible. At a minimum, this must be a Premium Efficiency motor with Class F
insulation. Motors that are not supplied by Loren Cook
Company should have the recommendation of the motor
manufacturer for use with a VFD.
Grounding -
The fan frame, motor and VFD must be connected to a
common earth ground to prevent transient voltages from
damaging rotating elements.
Wiring -
Line reactors may be required to reduce over-voltage
spikes in the motors. The motor manufacturer should be
consulted for recommended line impedence and usage of
line reactors or filters, if the lead length between the VFD
and the motor exceeds 10 feet (3m).
Fan -
It is the responsibility of the installing body to perform
coast-down tests and identify any resonant frequencies
after the equipment is fully installed. These resonant frequencies are to be removed from the operating range of
the fan by using the “skip frequency” function in the VFD
programming. Failure to remove resonant frequencies
from the operating range will decrease the operating life of
the fan and void the warranty.
Wiring Installation
All wiring should be in accordance with local ordinances
and the National Electrical Code, NFPA 70. Ensure the
power supply (voltage, frequency, and current carrying
capacity of wires) is in accordance with the motor nameplate.
2
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.
1
Line
L
2
Wiring Diagrams
3 Phase, 9 Lead Motor
Y-Connection
Low Voltage
208/230 Volts
4
5
6
3
1
9
728
L2L
L
1
3
High Voltage
460 Volts
456
789
3
12
L2L
L
1
To reverse, interchange any 2 line leads.
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
L
1
3
High Voltage
7
6
1
5
4
3
2
L
L
3
2
9
8
460 Volts
789
456
12
L1L
L
2
3
3
2 Speed, 2 Winding, Single Phase Motor 2 Speed, 1 Winding, 3 Phase Motor
Ground A
L
T-5
J-10
Link A
Link B
Low Voltage
Ground B
Line
L
1
T-5
J-10
2
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.
Ground A
Link A & B
L
Line
L
High Speed
1
Motor
2
1
Together
2
3
L
4
1
L
5
2
6
Line
L
3
Low Speed
Motor
To reverse, interchange any 2 line leads. Motors require magnetic control.
Single Speed, Single Phase, Dual Voltage 2 Speed, 2 Winding, 3 Phase
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-5 and J-10 leads. To reverse: High Speed-interchange leads T11 and T12.
High Speed
Low Speed
L
1
Line
L
2
Low Speed-interchange leads T1 and T2. Both Speeds-interchange any 2
Typical Damper Motor Schematic
Fan
Motor
Transformer**
L3
L2
L1
Transformer**
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 or 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.
L
1
1
L
2
2
3
Line
L
3
4
Open
5
6
Damper
Motor*
Second
Damper
Motor
Lock off all power sources before unit is wired to
power source.
Leave enough slack in the wiring to allow for motor
movement when adjusting belt tension. Some fractional motors have to be removed in order to make
the connection with the terminal box at the end of the
motor. To remove motor, remove bolts securing
motor base to power assembly. Do not remove motor
mounting bolts.
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.
Airfoil
Proper Wheel Rotation
3
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