COOK SQN - Manual (Page 3)

3
square to adjust the position of the motor pul-
ley until the belt is parallel to the longer leg of
the square.
Blower Installation
The blower is shipped with the motor in the
12 o’clock position and the feet are shipped
loose.
a. Upon receipt of the fan, remove the
eight (8) feet shipped with the fan and ensure the feet
are the correct type. Refer to Figure 4.
b. Determine how the fan is to be mounted. Refer to
Figure 5.
c. Remove the 5/16” bolt(s) from the corner of the hous-
ing in which the foot is to be attached.
d. Place the foot over the open bolt hole(s) and bolt the
foot to the unit. Refer to Figure 4.
Not on direct drive (C)
Not on direct drive (B)
Not on direct drive (A)
Not on direct drive
(D)
Not on direct drive (E)
Figure 5
Foot Mounting Illustrations
Sizes 70 - 135 Sizes 150 - 225 Sizes 245 - 402
iew of A or E Foot Assembly
Figure 4
Belt and Pulley Installation
If your fan is a direct drive, proceed to Blower Installa-
tion.
Belt tension is determined by the sound the belts make
when the fan is first started. Belts will produce a loud
squeal which dissipates after the fan is operating at full
capacity. If the belt tension is too tight or too loose, lost effi-
ciency and possible damage can occur.
Do not change the pulley pitch diameter to change ten-
sion. This will result in a different fan speed.
a. Loosen motor plate adjustment nuts on L-bolts 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 Figure1.
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 (indi-
cated by WXYZ) are to have a gap less than the tolerance
shown in the table. When the pulleys are not the same
width, the allowable gap must be adjusted by half of the dif-
ference in width. Figure 3 illustrates using a carpenter’s
1 foot
1/4 inch
Figure 1
Figure 2
OFFSET ANGULAR OFFSET/ANGULAR
A
W
X
Y
Z B
CENTER
DISTANCE
(CD)
GAP GAP
Tolerance
Center Distance
Maximum
Gap
Up thru 12” 1/16”
12” up through 48 1/8”
Over 48” 1/4”
Figure 3