COOK Propeller Upblast - Manual (Page 2)

2
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 toler-
ance. All contact points (indicated by
WXYZ) are to have a gap less than the tol-
erance shown in the table. When the pul-
leys are not the same width, the allowable
gap must be adjusted by half of the difference in width. Fig-
ure 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.
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 name-
plate. Refer to the Wiring Diagrams, on page 3.
Lock off all power sources before unit is wired to power
source.
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.
Tolerance
Center Distance
Maximum
Gap
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
Z B
CENTER
DISTANCE
(CD)
GAP GAP
Figure 2
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 emer-
gency, and in order that maintenance personnel are
provided complete control of the power source.
Installation
Damper 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 by installing at least
two sheet metal screws (#10 x 1/2”) on each side of the
damper, through the tray, with the screw head catching
the flange on the damper. This will prevent the dampers
from lifting.
c. Drill a hole in the curb shelf for conduit needed for
motor wiring.
d. Operate the dampers manually to ensure the blades
move freely. Dampers should be released from full
open position to check for proper closing.
Motor 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.
The motor should be mounted so that the motor plate is
between the fan shaft and motor shaft.
a. Remove the motor plate mounting bolts and the motor
plate.
b. Remove the motor mounting bolts from the motor plate.
c. Mount the motor to the motor plate aligning to the
appropriate holes.
d. Place the motor plate on the power assembly and rein-
stall the mounting bolts.
Belt and Pulley Installation
If your fan is a direct drive (model AUD), proceed to Wir-
ing 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.
Note
An inlet basket guard is recommended. A basket
guard prevents any large debris from being pulled
into the fan and damaging the propeller. The Loren
Cook basket guard is installed on top of the curb
before the fan is installed.
1 foot
1/4 inch
Figure 1
Figure 3