Cook H-Series Manuel d'utilisateur télécharger pdf (Page 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

CENTER

DISTANCE

(CD)

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

Filter

Filter Installation Detail

Figure 4

1 2 3 4 5 6 7 8

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Cook H-Series Manuel d'utilisateur Page 3

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