Damper Installation; Pulley Alignment; Wiring Installation - COOK LO-PRO Installation, Operation And Maintenance Manual

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 existing mount-
ing 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.
1. Place the damper inside the curb or inside the duct work.
Ensure the damper will open freely for the correct direc-
tion of the airflow.
2. Secure to curb at the damper shelf.
3. Drill hole in the curb shelf for conduit needed for motor
wiring.
4. Operate the dampers manually to ensure the blades move
freely.
5. Install ventilator over curb.
Wall Installation
1. Position unit so that hinge on topcap is facing down.
Belt and Pulley Installation
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 operating at full capacity. If
belt tension is too tight or too loose, lost efficiency and dam-
age can occur.
Figure 1
Do not change the pulley pitch diameter to change tension.
The change will result in a different fan speed.
1. 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.
2. 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.
3. Lock the motor plate adjustment nuts in place.
4. Ensure pulleys are properly aligned. Refer to Figure 2.
Tolerance
OFFSET
Center Max. A
Distance Gap
W
Up thru 12" 1/16"
12" up
1/8"
through 48
Over 48 1/4"
X
Y
Figure 2
Z
LO-PRO IO&M
ANGULAR OFFSET/ANGULAR
CENTER
DISTANCE
(CD)
B
GAP

Pulley Alignment

Pulley alignment is adjusted by loos-
ening 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 shown in
the table. When the pulleys are not the
same width, the allow-able 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 Figure 3 is
parallel to the longer leg of the square.

Wiring Installation

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.
Refer to Wiring Diagrams, page 6.
NOTICE! Follow the wiring diagram in the discon-
nect 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
1. Position diverter so that air flow is directed up.
2. Seal between diverter flange and unit side panel with RTV
400 silicone. (RTV Silicone is NOT supplied.)
3. Use screws provided to secure diverter to unit.
Optional Grease Terminator Installation
1. Attach hardware to drain hole in the diverter. See Figure 4.
2. Screw new canister into lid.
Figure 4 Figure 4
GAP
2
Roof Top Installation Shown Roof Top Installation Shown
Conduit Nipple Conduit Nipple
Diverter Diverter
Terminator Lid Terminator Lid
Sealing Nut Sealing Nut
Terminator Terminator
Terminator Terminator
Terminator Terminator
B51021-004