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FAN SIZE

2000

2214

2412

2700

3000

3300

3612

4014

4412

A (In.)

23/64

25/64

7/16

35/64

3/8

11/32

3/8

3/8

15/32

WHEEL AND INLET CONE OVERLAP DETAIL

WHEEL

SIDE PLATE

INLET

CONE

A

THREADED

HOLES USED

FOR REMOVING

BUSHING

5. If the wheel is striking, correct it by loosening the hub set screws and

reposition the wheel on the shaft, or loosen the motor mounting bolts

and realign the wheel to the inlet so it does not hit. Retighten all set

screws and bolts and turn by hand again.

6. If the fan wheel is fastened with a taper-lock bushing and the wheel

must be shifted, follow this procedure:

a. Remove all bolts from the bushing.

b. Insert two bolts in the threaded holes in the bushing. See Detail.

(Note that one bolt is left over and not used in demounting.)

c. Tighten bolts alternately until bushing is loosened in hub. If the

bushing does not loosen immediately, lightly tap hub while

applying torque to the bolts.

To reinstall the taper-lock bushing in the wheel hub, clean bushing,

hub and shaft of all oil, lacquer, grease or dirt, and insert the three

mounting bolts through the unthreaded bushing holes into the hub.

Alternately tighten the bolts. When tightening, the bolts should be

turned down equally to the Initial Torque requirement given below.

Then tighten the bolts progressively one-half turn per bolt to the

Second Torque setting. Finally, the bolts should be tightened in small

increments to the Final Torque settings.

ARRANGEMENT 4

9. The run-in period should be at least eight hours. Check the

motor bearings a minimum of once each hour during this peri-

od. Do not overgrease motor bearings. Consult your motor

instruction book.

10.

Take vibration readings at the motor bearings. Adhere to

these limits. Velocity Limits in inches/second – Normal: 0.15; Alarm:

0.22; Shutdown: 0.50. Readings are based at operating speed (filter-

in).

MAINTENANCE:

To insure long life and trouble-free service, frequently check motor

bearing lubrication. See the motor manufacturer’s instructions

packed with the fan. Should excessive vibration develop, check the

following possibilities:

1. Build-up of dirt or foreign material on the wheel.

2. Loose bolts on motor, fan housings or foundation.

3. The wheel eroding or corroding..

4. Wheel set screws are loose.

5. Foreign matter may have entered fan causing damage to

wheel.

6. Vibration may be coming from a source other than the fan.

Stop the fan and determine if the vibration still exists. Disconnect

the motor from the fan and operate it by itself to determine if it pro-

duces vibration.

7. Proper clearance between the wheel and the inlet.

A preventive maintenance schedule is a necessity for extending fan life.

Establish a lubrication schedule based on time periods suggested in

lubrication instructions by motor manufacturers.

After approximately one (1) month of operation, all base, hub, motor, etc.

bolts should be checked.

Potentially damaging conditions are often signaled in advance by

change in vibration and sound. A simple, regular audio-visual inspection

of fan operation leads to correction of the condition before expensive

damage occurs. Vibration levels should be checked by an approved

technician using electronic balancing equipment.

If air handled by the fan contains corrosive, erosive or sticky materials,

fan should be shut down regularly for inspection, cleaning and recondi-

tioning of interior parts.

If the fan is to remain idle for an extended period, protect motor and

exposed surfaces. Follow the motor manufacturer’s recommendations

for storage and rotate the shaft by hand several revolutions each month.

Mechanical Integrity:

Certain operating conditions reduce the built-in

strength of the fan impeller and may cause unsafe operation. It is the

user’s responsibility to inspect for these conditions as frequently as

necessary and to make corrections as required. Failure to comply with

the following limits voids the Chicago Blower Corporation warranty.

Maximum Safe Speed and Temperature:

Operation exceeding maxi-

mum safe RPM and temperature even for a short time causes over-

stressing or fatigue cracking of the impeller resulting in unsafe condition.

Maximum safe speed and maximum safe temperature are shown on fan

assembly drawings, catalogs or order acknowledgement.

TAPER-LOCK

BUSHING DETAIL

3

Q & R

P

57

36

120

84

108

72

240

132

228

132

348

192

Size

Bushing Alum.

Steel

Alum.

Steel

Alum.

Steel

Check bushing to verify type or refer to the bushing box located in

the plastic envelope.

7. Check the motor wiring and fusing in accordance with the

National Electrical Code and local requirements. Follow wiring dia-

gram on the motor nameplates.

8. Check motor bearing lubrication. They were lubricated at the fac-

tory, but recheck, and if required use a good grade motor lubricant.

Consult your motor instruction book.

Initial Torque*

Second Torque*

Final Torque*

BLADE TIP

WIDTH

WHEEL

BACKPLATE

D1900 Series Only

Torque values shown are inch lbs. and apply when both components are

either aluminum or steel. If either component is aluminum, use values for

aluminum. Values for steel are for Grade 5 hardware.

*