COOK CV - Manual (Page 2)

2
1 foot
1/4 inch
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 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.
Final Installation Steps
1. Ensure that all accessories are installed.
2. Ensure that the blower is secured to ductwork.
3. Inspect wheel-to-inlet clearance. Ensure wheel does
not rub against the inlet.
4. Test the fan to ensure the rotation of the wheel is the
same as indicated by the rotation label.
5. Inspect for correct amperage with an ammeter and
correct voltage with a voltmeter.
Wheel Rotation
Test the fan to ensure the rotation of the wheel is the
same as indicated by the arrow marked Rotation.
115 and 230 Single Phase Motors
Fan wheel rotation is set correctly at the factory.
Changing the rotation of this type of motor should only be
attempted by a qualified electrician.
208, 230, and 460, 3 Phase Motors
These motors are electrically reversible by switching two
of the supply leads. For this reason, the rotation of the fan
cannot be restricted to one direction at the factory. See
Wiring Diagrams for specific information on reversing
wheel direction.
NOTICE! Do not allow the fan to run in the wrong
direction. This will overheat the motor and cause
serious damage. For 3-phase motors, if the fan is
running in the wrong direction, check the control
switch. It is possible to interchange two leads at this
location so that the fan is operating in the correct
direction.
Figure 3
Figure 1
Figure 2
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
Wiring Installation
NOTICE! 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 nameplate. Refer to the
Wiring Diagrams, on page 3.
NOTICE! Lock off all power sources before unit is wired to
power source.
Direct drive - Wire the electrical box on the blower housing.
Belt drive - The motor can be wired directly since the motor is
external to the fan.
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 connection with the terminal box at
the end of the motor. To remove motor, remove bolts securing
motor base to power assembly. Do not remove motor mounting
bolts.
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 identify the closed switch to promote
safety (i.e., red tape over a closed switch).
Belt and Pulley Installation
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
efficiency and possible damage can occur.
Do not change the pulley pitch diameter to change
tension. This will result in a different fan speed.
a. Loosen motor plate adjustment bolts and slide motor
plate so 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. Slide motor plate back 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 bolts in place.
d. Ensure pulleys are properly aligned. Refer to Figure 2.