OPERATION OF FAN:
After installing the fan per these instructions and the instructions of the
manufacturers, make final safety checks to prevent injury to personnel
or damage to the equipment.
Always block rotating parts to prevent
windmilling while inspecting the fan.
1. Lock power source in “OFF” position.
2. Check bearings for alignment and proper lubrication, with wheel and
inside of the housing clean and free of debris.
3. Check wheel position for proper clearance and rotation. Unblock
rotating parts and turn wheel by hand to insure that it rotates freely.
4. Check sheave set screws or bushings and wheel set screws for tight-
ness. If fan is a HEAT FAN, check to see that the shaft cooling wheel
bolts are tight. Check foundation bolts. Secure safety guards and
5. If fan is designed for low density (such as high temp), make sure
overload of fan motor is avoided if fan is run with standard air.
6. Start fan and allow unit to reach full speed, then shut down. During
this short period, check for rotation, excessive vibration, any unusual
noise, or overheating of the motor. Check the motor amps drawn
against the nameplate rating. A plate over the fan inlet will limit the
horsepower drawn during a test run with limited ductwork.
7. After the trial run lock the power “OFF”.
8. Recheck for tightness of hold-down bolts, wheel set screws and keys,
and retighten if necessary. Recheck after eight and twenty-four hours
9. The run-in period should be at least eight hours. Check bearings a
minimum of once each hour during this period. Overgreasing may
cause bearings to heat up. There need be no concern if the bare hand
can be held on the bearings briefly. Bearings will vent extra grease
and cool down after start-up. Recheck torque of all bearing set
screws after eight and twenty-four hours of operation to insure levels
are maintained per the bearing manufacturer’s recommended levels.
Take vibration readings at the bearings, or the motor bearings if
the fan wheel is mounted directly on the motor shaft. Adhere to these
limits. Velocity limits in inches/second – Normal: 0.15; Alarm: 0.22;
Shutdown: 0.50. These values are peak velocity values, filter-in, at
the fan rotational speed.
To insure long life and trouble-free service, frequently check all bearing
lubrication. See the bearing 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 bearings, housings, foundation and drive.
3. V-belt drive improperly aligned. Belts must have proper tension,
sheaves must be balanced.
4. Check wheel set screws or bushing cap screws.
5. Foreign matter may have entered fan causing damage to wheel, shaft
6. Vibration may be coming from a source other than the fan. Stop the fan
and determine if the vibration still exists. Disconnect the driver from the
fan and operate it by itself to determine if it produces vibration.
7. Improper clearance between the wheel and the inlet cone.
A preventive maintenance schedule is a necessity for extending fan life.
Establish a lubrication schedule based on time periods suggested in
lubrication instructions and by motor and bearing manufacturers.
After approximately one (1) month of operation, all base, hub bearing,
pedestal, 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, fill bearing with grease.
Protect motor and exposed surfaces. Follow the motor manufacturer’s
recommendations for storage and rotate the shaft by hand several revo-
lutions each month.
Certain operating conditions reduce the built-in
strength in the fan impeller and may cause unsafe operation. It is the
user’s responsibility to inspect for these conditions as frequently as
necessary and 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.
The warranty on Chicago Blower fans is our standard warranty. The warranty on the motor is that extended by the motor manufacturer.