COOK Lo-Pro - Manual (Page 2)

2
Wiring Installation
All wiring should be in accordance with local
ordinances and the National Electrical Code,
NFPA 70. Ensure the power supply (voltage, fre-
quency, and current carrying capacity of wires)
is in accordance with the motor nameplate.
Refer to the Wiring Diagrams, next page.
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.
NOTICE! 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.
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, Recommended Torque for Setscrews/Bolts.
b. Inspect for correct amperage and voltage with an
ammeter and voltmeter.
c. Ensure all accessories are installed.
d. Check wheel-to-inlet clearance on power roof fans.
e. Test the fan to be sure the rotation is the same as indi-
cated by the arrow marked ‘Rotation’.
NOTICE! Do not allow the fan to run in the wrong
direction. This will overheat the motor and cause seri-
ous damage. For 3-phase motors, if the fan is running
Conduit Nipple Conduit Nipple
Diverter Diverter
Terminator Lid Terminator Lid
Sealing Nut Sealing Nut
Terminator Terminator
Terminator Terminator Terminator Terminator
Roof Top Installation Shown Roof Top Installation Shown
Figure 4 Figure 4
Wall Installation
a. 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
damage can occur.
Do not change the pulley pitch diameter to change ten-
sion. 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.
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 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
is parallel to the longer leg of the square.
1 foot
1/4 inch
Figure 1
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
Z B
CENTER
DISTANCE
(CD)
GAP GAP
Figure 2
Tolerance
Center Distance
Maximum
Gap
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Figure 3