Loren Cook Lo-Pro 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.
Lo-Pro
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.
Low Profile Centrifugal Exhaust Fans
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
This publication contains the installation, operation
and maintenance procedures for standard units of the
Lo-Pro - Low Profile Centrifugal Exhaust Fans.
• LPD/LPB
Carefully read this publication prior to installation.
Loren Cook catalog, Lo-Pro, 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 , exte nsion
166; by FAX at 417/832-9431; or by e-mail at info@lorencook.com.
For information and instructions on special equipment,
contact Loren Cook Company 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.
• Check dampers (if included) for free operation of all
moving parts.
• Record on the Delivery Receipt any visible sign of
damage.
existing mounting slots.
Damper Installation
If your fan is supplied with dampers, follow the directions
below. If your fan does not include dampers, proceed to
Belt and Pulley Installation.
a. Place the damper inside the curb. Ensure the damper
will open freely for the correct direction of the airflow.
b. Secure to curb at the damper shelf.
c. Drill a hole in the curb shelf for conduit needed for
motor wiring.
d. Operate the dampers manually to ensure the baldes
move freely.
e. Install ventilator over curb.
Wall Installation
a. Position unit so that hinge on topcap is facing down.
Handling
Lift the fan by the base or by the shipping carton. Never
lift by the shaft, motor or housing.
Storage
If the fan is stored for any length of time prior to installation, store it in its original shipping crate and protect it from
dust, debris and the weather.
Installation
To prevent damage to the fan during shipping, motors 5
HP and larger, and extremely heavy motors (cast iron or
severe duty) are shipped loose and must be field mounted
by bolting the motor on the motor mounting plate in the
Lo-Pro
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.
Conduit Nipple
Diverter
Terminator Lid
Sealing Nut
Terminator
Terminator
Terminator
Roof Top Installation Shown
Figure 4
Belt and Pulley Installation
1 foot
1/4 inch
Figure 1
Figure 2
Tolerance
Center Distance
Maximum
Gap
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Belt tension is determined by the sound of the belts when
the fan is first started. The belts will produce a loud squeal,
which dissipates after the fan is oper ating at full capacity. If
belt tension is too tight or too loose, lost efficiency and
damage can occur.
Do not change the pulley pitch diameter to change tension. The change will result in a different fan speed. )
a. Loosen the motor plate adjustment nuts on motor
base 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 1.
c. Lock the motor plate adjustment nuts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 2.
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
CENTER
DISTANCE
(CD)
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.
Refer to the Wiring Diagrams, next page.
Lock off all power sources before unit is wired to
power source.
Leave enough slack in the wiring to allow for moto r m ovement 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.
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).
Optional Diverter
a. Position diverter so that air flow is directed up.
b. Seal between diverter flange and unit side panel with
RTV 400 silicone. (RTV Silicone is NOT supplied.)
c. Use screws provided to secure diverter to unit.
Optional Grease Terminator Installation
a. Attach hardware to drain hole in the diverter.
See Figure 4.
b. Screw new canister into lid.
Roof Top Installation Shown
Conduit Nipple
Z
B
GAP
Pulley Alignment
Pulley alignment is adjusted by loosening the motor pulley
setscrew and by moving the motor pulley on the motor shaft.
Figure 2 indicates where to measure the allowable gap
for the drive alignment tolerance. All contact points (indicated by WXYZ) are to
have a cap less than the tolerance sh own
in the table. When the pulleys are not the
same width, the allowable gap must be
adjusted by half of the difference in width.
Figure 3 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.
Figure 3
GAP
Diverter
Terminator Lid
Sealing Nut
Terminator
Terminator
Figure 4
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 on
page 4,
2
Terminator
Fan
Motor
Damper
Motor*
Second
Damper
Motor
T
ransformer**
T
ransformer**
L3
L2
L1
4
5
6
1
728
3
9
L
1
L2L
3
456
789
12
3
L
1
L2L
3
Low Voltage
208/230 Volts
High Voltage
460 Volts
3 Phase, 9 Lead Motor
Y-Connection
Wiring Diagrams
T-1
T-4
Ground B
L
2
L
1
Ground A
Line
Ground A
Ground B
T-1
T-4
Low Speed
High Speed
L
1
L
2
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
Motor
1
2
3
4
5
6
Together
High Speed
Line
L
1
L
2
L
3
1
2
3
4
5
6
Open
Low Speed
Line
L
1
L
2
L
3
Motor
Low Speed
Low Speed
Low Speed
High Speed
High Speed
High Speed
T
3
T
2
T
1
T
11
T
12
T
13
Motor
L
1
L
2
L
3
Line
7
1
6
789
456
12
3
Low Voltage
208/230 Volts
High Voltage
460 Volts
8
2
4
9
3
5
L1L
3
L
2
L
1
L
3L2
3 Phase, 9 Lead Motor
Delta-Connection
Single Speed, Single Phase Motor
Wiring Diagrams
When ground is required, attach to ground A or B with no. 6 thread forming
To reverse, interchange any 2 line leads.
screw. To reverse, interchange T-1 and T-4.
2 Speed, 2 Winding, Single Phase Motor 2 Speed, 1 Winding, 3 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.
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 T11 and T12.
Low Speed-interchange leads T
line leads.
and T2. Both Speeds-interchange any 2
1
Typical Damper Motor Schematic
For 3 phase, damper motor voltage should be the same between L1 and
. For single phase application, disregard L3. *Damper motors may be
L
2
available in 115, 230 and 460 volt models. The damper motor nameplate
voltage should be verified prior to connection. **A transfomer may be provided in some installations to correct the damper motor voltage to the
specified voltage.
3
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