COOK H-Series - Manual (Page 3)

3
The motor should be mounted in order that the motor
plate is between the fan shaft and the 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
reinstall the mounting bolts.
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 effi-
ciency 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 pul-
ley setscrew and by moving the motor pulley on the motor
shaft.
1 foot
1/4 inch
Figure 1
Figure 2 indicates where to measure the allowable gap
for the drive alignment tolerance. All contact
points (indicated 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 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.
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, previous page.
Leave enough slack in the wiring to allow for motor
movement when adjusting belt tension. Some fractional
motors have to be removed in order to make the connec-
tion 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).
Fan Installation
The fan support (roof curb) should provide a level surface
for installation. If the roof is pitched more than 1/2:12, a
sloped curb must be used to correct the problem.
Place fan over roof opening. Secure the fan with lag
screws, anchor bolts, or other suitable fasteners.
Hood Assembly
Hoods for some non-filtered fans (size 42 and larger) and
some filtered fans (size 36 or larger) require field assembly.
Assembly is accomplished using 1/2” and 9/16” socket
wrenches. Line-up punches and hand clamps will speed up
the assembly. Figure 4 shows the components used to
assembly the hood.
a. Place the hood halves (A) onto the hood supports (D).
Line up the hood flanges and bolt the flanges of the
hood ends (G) together. The top caps (B) must be inter-
locked for the flanges to meet correctly.
b. Go under the hood and bolt the hood (angle flange) to
the hood supports (D) at the four overlapping locations.
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
B
G
C
B
A
E
F
D
F
E
E
Filter
Filter Installation Detail
G
E
C
F
Figure 4