COOK LO-PRO Installation, Operation And Maintenance Manual Download Page 2

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LO-PRO IO&M

B51021-004

Installation

To prevent damage to the fan during shipping, motors 5 HP 

and larger, and extremely heavy motors (cast iron or severe 

duty) are shipped loose and must be field mounted by bolting 

the motor on the motor mounting plate in the existing mount-

ing slots.

Damper Installation

If your fan is supplied with dampers, follow the directions 

below. If your fan does not include dampers, proceed to 

Belt 

and Pulley Installation

.

1.  Place the damper inside the curb or inside the duct work. 

Ensure the damper will open freely for the correct direc-

tion of the airflow.

2.  Secure to curb at the damper shelf.

3.  Drill hole in the curb shelf for conduit needed for motor 

wiring.

4.  Operate the dampers manually to ensure the blades move 

freely.

5.  Install ventilator over curb.

Wall Installation

1.  Position unit so that hinge on topcap is facing down.

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 efficiency and dam-

age can occur.

Do not change the pulley pitch diameter to change tension. 

The change will result in a different fan speed.

1.  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.

2.  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

.

3.  Lock the motor plate adjustment nuts in place.

4.  Ensure pulleys are properly aligned. Refer to 

Figure 2

.

Tolerance

Center 

Distance

Max. 

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

Pulley Alignment

Pulley alignment is adjusted by loos-

ening 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 

cap 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 3

 illustrates using a carpenter’s square to 

adjust the position of the motor pulley until the belt 

Figure 3

 is 

parallel to the longer leg of the square.

Wiring Installation

Leave enough slack in the wiring to allow for motor move-

ment  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.

Refer to Wiring Diagrams, page 6.

NOTICE! Follow the wiring diagram in the discon-

nect 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).

Optional Diverter

1.  Position diverter so that air flow is directed up.

2.  Seal between diverter flange and unit side panel with RTV 

400 silicone. (RTV Silicone is NOT supplied.)

3.  Use screws provided to secure diverter to unit.

Optional Grease Terminator Installation

1.  Attach hardware to drain hole in the diverter. See 

Figure 4

.

2.  Screw new canister into lid.

Conduit Nipple

Conduit Nipple

Diverter

Diverter

Terminator Lid

Terminator Lid

Sealing Nut

Sealing Nut

Terminator

Terminator

Terminator

Terminator

Terminator

Terminator

Roof Top Installation Shown

Roof Top Installation Shown

Figure 4

Figure 4

1 foot

1/4 inch

Figure 1

Figure 2

Summary of Contents for LO-PRO

Page 1: ...left unguarded Any object pulled into the inlet will become a projectile capable of causing serious injury or death When air is allowed to move through a non powered fan the impeller can rotate which...

Page 2: ...leys are properly aligned Refer to Figure 2 Tolerance Center Distance Max 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 Pull...

Page 3: ...the inspections stop the fan and inspect as per the chart below 30 Minute Interval Inspect bolts setscrews and motor mounting bolts Adjust and tighten as necessary 8 Hour Interval Inspect belt alignm...

Page 4: ...months 2 weeks Motors are provided with a polyurea mineral oil NGLI 2 grease All additions to the motor bearings are to be with a compatible grease such as Exxon Mobil Polyrex EM and Chevron SRI Maxi...

Page 5: ...and setscrews and re peat from step 5 Wheel Replacement 1 Drill two holes approximately centered between the shaft and the edge of the hub OD with the following dimensions 1 4 diameter 3 8 to 1 2 dee...

Page 6: ...le phase application disregard L3 Damper motors may be avail able in 115 230 and 460 volt models The damper motor nameplate voltage should be verified prior to connection A transformer may be provided...

Page 7: ...nced wheel Belts too loose worn or oily belts Speed too high Incorrect direction of rotation Make sure the fan rotates in same direction as the arrows on the motor or belt drive assembly Bearings need...

Page 8: ...d other than for the uses described in the com pany manual This warranty does not cover defects resulting from normal wear and tear To make a warranty claim notify Loren Cook Company General Offices 2...

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