Loren Cook PLC Installation Manual
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.
PLC
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.
Centrifugal Plenum Fans
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
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.
Loren Cook catalog, PLC, provides additional info rmatio n
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.
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.
Handling
Lift the fan by the base or lifting eyes on the housing.
Never lift by the shaft, wheel, or motor.
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.
Outdoor Storage
To maintain good working condition of the fan when it is
stored outdoors, follow the additional instructions below.
• Coat the shaft with grease or a rust preventative compound.
• Wrap bearings for weather protection.
• Cover the entire fan to prevent the accumulation of dirt
and moisture in the fan.
• Periodically rotate the wheel and operate the dampers (if
supplied).
• Periodically inspect the fan to prevent damaging conditions.
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 foundation’s size is determined by fan size and arrangement,
motor size and position, and the specific location of the
installation.
Use the following guidelines to calculate foundation size:
• The overall dimensions of the foundation should extend
at least 6 inches beyond the outline of the fan and its
motor.
• The weight of the foundation should be 2 to 3 times the
weight of the fan and its motor.
Isolation
Isolation Base
If supplied, mount the fan on the rigid isolation base that
runs the entire length of the fan base angle.
When the motor is not an integral part of the unit, mount
the fan and its motor to a common rigid base running the full
length of the fan and motor.
The base must have sufficient rigidity to resist belt pull and
prevent drive distortion which can lead to excessive belt and
bearing wear. Isolators should be located between this rigid
base and the floor.
PLC
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
Scale 2.000
Isolators
Note
Although a certain amount of vibration is inhere nt in
operating centrifugal fans , extre m e vi b ra ti on is a serious problem that may cause structural and mechanical failure.
Rubber-In-Shear Isolator
Spring Isolator
Figure 1 - Floor Mount Isolators
Minimum
1 wheel
diameter
Figure 2 - Non-ducted Inlet Clearance
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.
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 counte r
clockwise several turns at a time alternately on each
isolator until the fan weight is transferred onto the isolators and the fan raises uniformly off the blocks. Then
remove the blocks.
• Turn lock nut onto leveling bolt and secure firmly in
place against the top of the mounting flange or frame.
• Secure isolators to mounting surface.
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 cou ld
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.
Floor Mounted Rubber-In-Shear (RIS) Isolators
• Mount fan and motor on an isolation base (if supplied).
• Elevate fan to provide room to insert isolators between
base and foundation or between the fan and foundation
and block in position.
• Position isolators under isolation base or fan and
secure bolts.
• Remove blocks and allow unit to rest on floor. Isolators
must be installed on a level surface (leveling should not
be required).
• Secure isolators to mounting surface.
Duct Installation
Efficient fan performance relies on proper installation.
If the fan has an open inlet (no duct work), be sure it is
placed one fan wheel diameter away from walls and bulkheads. Refer to figure 2.
Refer to the PLC catalog for discharge wall proximity
factors.
Wiring Installation
All wiring should be in accordance with local ordinances and the National Electrical Code, NFPA 70.
Ensure the power supply (voltage, frequency, and current carrying capacity of wires) is in accordance with
the motor nameplate.
Lock off all power sources before unit is wired to
power source.
Leave enough slack in the wiring to allow for motor
movement when adjusting belt tension. Some fractional motors have to be removed in order to make the
connection with the terminal box at the end of the
motor. To remove motor, remove bolts securing motor
base to power assembly. Do not remove motor mounting bolts.
2
Use of Variable Frequency Drives
T-1
T-4
Ground B
L
2
L
1
Ground A
Line
Ground B
J-10
T-5
Ground A
Link A
Link B
Low Voltage
Line
L
2
L
1
Ground A
Link A & B
L
1
L
2
Line
Ground B
T-5
J-10
Fan
Motor
Damper
Motor*
Second
Damper
Motor
T
ransformer**
Transformer**
L3
L2
L1
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 element s.
Wiring Diagrams
Wiring -
Line reactors may be required to reduce over-voltage
spikes in the motors. The motor manufactu rer sho u l d 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.
Single Speed, Single Phase Motor
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.
High Speed
Low Speed
L
1
Line
L
2
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
12
L2L
L
1
3 Phase, 9 Lead Motor
Delta-Connection
Low Voltage
208/230 Volts
8
7
4
6
2
1
3
L
1
3
L
L
2
High Voltage
460 Volts
9
5
3
3
789
456
12
L
1
3
L
L
3
2
To reverse, interchange any 2 line leads.
2 Speed, 1 Winding, 3 Phase Motor
High Speed
1
Together
2
Motor
3
L
4
1
L
5
2
6
Line
L
3
To reverse, interchange any 2 line leads. Motors require magnetic control.
Low Speed
Motor
L
1
1
L
2
2
3
Line
L
3
4
Open
5
6
Single Speed, Single Phase, Dual Voltage
When ground required, attach to ground A or B with No. 6 thread forming
screw. To reverse, interchange T-5 and J-10 leads.
Typical Damper Motor Schematic
For 3 phase, damper motor voltage should be the same between L1 and L2. For single phase application, disregard L
voltage should be verified prior to connection. **A transformer may be provided in some installations to correct
the damper motor voltage to the specified voltage.
. *Damper motors may be available in 115, 230 and 460 volt models. The damper motor nameplate
3
2 Speed, 2 Winding, 3 Phase
To reverse: High Speed-interchange leads T11 and T12.
Low Speed-interchange leads T
line leads.
3
and T2. Both Speeds-interchange any 2
1
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