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6. With the wheel temporarily pushed flush against the inside plenum

wall, the shaft can be centered on the hole, the inboard bearing

mounting bolts tightened and then the outboard bearing mounting

bolts tightened. This locates the shaft perpendicular to the plenum

wall and fan drive panel. Check level shaft.

If the fan is vertically mounted with inlet down, block the wheel and

shaft in place with wood blocking to prevent damage. Do not block

bearings to shaft yet.

7. Slide the shaft through the bearings and locate its drive end flush

with the end of the motor shaft. Make sure the bearing locking collar

is in position and tighten set screws to the bearing manufacturer’s

torque levels. See bearing manufacturer’s instructions enclosed for

details.

8. Slide the wheel along the shaft and position it a distance from the

plenum wall, determined by the thickness of the insulation or the

gap designed in the plenum. This dimension is not critical. Any

extra length of shaft may extend through the hub without harm.

9. Install the inlet cone loosely on the housing or plenum structure,

attaching it only at four points until final adjustments are made.

Move the wheel along the shaft so that it slightly overlaps the inlet

cone. Position the inlet cone to be concentric to the wheel opening

with equal spacing in a radial direction all around. The inlet cone

can be firmly fastened at this time.

On a Heat Fan or a fan not operating at maximum static pressure, it

is satisfactory to have an axial

gap between the wheel and

inlet cone of 3/16" to 5/8"

depending upon the fan size.

This axial gap can be adjusted

by moving the wheel closer to

or farther away from the cone.

Position the wheel so that the

set screw over the key is at the

bottom. Torque the bottom set

screw first and then the oppos-

ing set screw next. Torque all

set screws per the Torque Values chart.

Recheck the wheel cone to inlet cone clearance.

Mount the adjustable motor base on the drive panel gusset as

shown in the illustration. Mount the motor on the adjustable motor

base and adjust the base height for the approximate center distance

of the V-belt being used.

Loosely install the fan and motor sheaves and the belts. Tighten the

fan sheave first, then align the motor sheave to the fan sheave. The

fan and motor shafts must be parallel. See V-belt Drive section of

this manual for sheave alignment and installation.

If the fan handles air above 300° F, install the shaft-cooling wheel by

either centering it in the space between the inboard bearing and drive

panel, or by setting it in the recessed area in the drive panel. Two self-

tapping bolts clamp the cooler to the shaft. Install all shaft, cooling

wheel, bearing guards and belt guards as required.

If the fan has been provided with an Inlet Volume Control (IVC), it is

mounted in the inlet cone and no further adjustments are required

except to hook up the operating lever to the Customer’s Control.

The IVC should be checked for correct rotation. Looking at the IVC

from the inlet side with IVC blades half closed, the blades should

pre-spin the entering air in the same direction as the fan wheel is

rotating.

Chicago Blower requires that all appurtenances, including ductwork

or stacks, which are attached to the fan inlet or outlet, be inpen-

dently supported, unless prior approval has been obtained from

Chicago Blower. Excess dead loads or wind loads can distort the

fan housing causing misalignment and possible failure. Flexible

connections are also necessary to prevent duct expansion or

movement from adding loads to the fan.

NOTE: For High Temperature Applications – The fan should not be

shut off until the airstream temperature is below 200°F.

ASSEMBLY PROCEDURE:

1. Drive panel must be mounted on a rigid and substantial foundation on

the plenum chamber wall. Careful design of the mounting structure is

needed to insure vibration-free operation. If the structure is not rigid,

harmonic vibrations occur. On some “soft” structures, field touch-up

balancing may be necessary to

balance the complete system struc-

ture.

2. Make sure the wheel rotation is correct (

clockwise or counterclock-

wise as viewed from the drive side

) for the planned discharge from

the plenum chamber or accessory housing.

3. If the accessory housing is being used, it should be installed flush against

the inside plenum wall before the wheel is put on the fan shaft. Fasten

to the plenum wall by bolting or stitch welding.

4. Check shaft and keyways for nicks from handling. File off. Slide the

wheel onto shaft end with the longest keyway. Insert the key and lightly

tighten the wheel set screws with the wheel positioned half way along

the keyway.

5. From inside the plenum, push the drive end of the drive shaft through the

plenum shaft hole and through the inboard bearing bracket. With the

shaft end halfway to the outboard bracket, slip one bearing on the shaft.

Then push the wheel-shaft assembly all the way through and install the

drive bearing. Use mounting hardware as shown below. Both bearings

are the same.

FLANGE MOUNT BEARING DETAIL

PILLOWBLOCK BEARING DETAIL

SET SCREW TORQUE VALUES

1/4

5/16

3/8

7/16

1/2

5/8

3/4

20

18

16

14

13

11

10

65.5

136.0

239.0

381.0

586.0

1163.0

2076.0

Bolt

Size

(In. Dia.)

Threads

Per

Inch

Steel Grade 2

Non-Plated

(Inch-lbs.)

DETAIL A

DETAIL A

*SHIMMING UNDER BEARING FEET IS

NECESSARY TO VERTICALLYALIGN BEAR-

10.

11.

12.

13.

14.

15.