Cook FCP User Manual download pdf (Page 3)

restricted to one direction at the factory. See Wiring

Diagrams above 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.

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

than desired.

1. 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.

2. Slide the 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 Figure 3.

3. Lock the motor plate adjustment nuts in place.

4. Ensure pulleys are properly aligned. Refer to Figure 4.

OFFSET ANGULAR OFFSET/ANGULAR

CENTER

DISTANCE

(CD)

GAP

Figure 4

Tolerance

Center

Distance

Maximum

Gap

Up thru 12” 1/16”

12” up through

48”

1/8”

Over 48” 1/4”

Wheel-to-Inlet Clearance

The correct wheel-to-inlet clearance is critical to proper

fan performance. This clearance should be verified before

initial start-up since rough handling during shipment could

cause a shift in fan components. Refer to wheel/inlet draw-

ing for correct overlap.

Adjust the overlap by loosening the wheel hub and mov-

ing the wheel along the shaft to obtain the correct value.

A uniform radial gap (space between the edge of the

cone and the edge of the inlet) is obtained by loosening the

inlet cone bolts and repositioning the inlet cone.

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.

(See page 5 for diagram)

NOTICE! Fan must be grounded to prevent electrical

discharge.

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.

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).

Wheel Rotation

Test the fan to ensure the rotation of

the wheel is the same as indicated by

the arrow marked Rotation.

For 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.

For 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

Wheel/Inlet Overlap

Radial Clearance

Overlap

Size

Maximum

Overlap

120 - 180 5/8”

225 - 270 3/4”

300 - 365 1”

OVERLAP

RADIAL

GAP

DETAIL A

1 foot

1/4 inch

Figure 3

1 2 3 4 5 6 7 8

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Cook FCP User Manual Page 3

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