Cook QMX User Manual download pdf (Page 3)

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 below for correct overlap.

Adjust the overlap by loosening the wheel hub and mov-

ing the wheel along the shaft to obtain the

correct value. Trim balance as necessary

following procedure (.0785 in/sec max).

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.

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 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 3.

c. Lock the motor plate adjustment nuts in place.

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

Pulley Alignment

Pulley alignment is adjusted by loosening the motor pulley

setscrew and by moving the motor pulley on the motor shaft.

Wheel/Inlet Overlap

SEE DETAIL A

OVERLAP

RADIAL GAP

DETAIL A

1 foot

1/4 inch

Figure 3

Figure 4 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 allow-

able gap must be adjusted by half of the

difference in width. Figure 5 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, frequency, and current carrying

capacity of wires) is in accordance with the motor name-

plate.

Lock off all power sources before unit is wired to

power source.

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. 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. Cor-

rectly 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).

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”

Personal Safety

Disconnect switches are recommended. Place the

disconnect switch near the fan in order that the

power can be swiftly cut off in case of an

emergency, and in order that maintenance

personnel are provided complete control of the

power source.

Unit

Size

Overlap

(Inches)

90 0.16

120 0.19

135 0.20

150 0.22

165 0.23

180 0.24

202 0.27

225 0.29

245 0.31

270 0.33

300 0.37

330 0.41

365 0.45

402 0.50

445 0.55

490 0.61

540 0.67

600 0.76

Figure 5

1 2 3 4 5 6 7 8 ... 11 12

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Cook QMX User Manual Page 3

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