COOK LC - Manual (Page 4)

4
Operation
Pre-Start Checks
a. Lock out all the primary and secondary power sources.
b. Inspect fasteners and setscrews, particularly those
used for mounting the fan, and tighten if necessary.
c. Inspect belt tension and pulley alignment. (Remember,
if belt tension is correct, a loud squeal occurs as the
fan increases to full power.)
d. Inspect motor wiring.
e. Ensure the belt touches only the pulleys.
f. Ensure fan and ductwork are clean and free of debris.
g. Test the fan to ensure the rotation of the wheel is the
same as indicated by the rotation label.
h. Restore power to unit.
Start Up
Turn the fan on. In variable speed units, set the fan to its
lowest speed. Inspect for the following:
• Direction of rotation.
• Excessive vibration.
• Unusual noise.
• Bearing noise.
• Improper belt alignment or tension (listen for a
continuous squealing noise).
• Improper motor amperage or voltage.
NOTICE! If a problem is discovered, immediately shut
off the fan. Lock out all electrical power and check for
the cause of the trouble. Refer to Troubleshooting,
page 6.
Inspection
Inspection of the fan should be conducted at the first 30
minute, 8 hour and 24 hour intervals of satisfactory
operation. During 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 alignment and tension. Adjust and tighten as
necessary.
24 Hour Interval
Inspect belt tension. Adjust and tighten as necessary.
Maintenance
Establish a schedule for inspecting all parts of the fan.
The frequency of inspection depends on the operating
conditions and location of the fan.
Recommended Torque for Setscrews/Bolts (IN/LB.)
Setscrews
Hold Down Bolts
Size
Key Hex
Across
Flats
Recommended
Torque Inch-lbs.
Min. Max. Size
Wrench
Torque (inch-lbs)
No.10 3/32” 28 33 3/8”-16 240
1/4” 1/8” 66 80 1/2”-13 600
5/16” 5/32” 126 156 5/8”-11 1200
3/8” 3/16” 228 275 3/4”-10 2100
7/16” 7/32” 348 384 7/8”-9 2040
1/2” 1/4” 504 600 1”-8 3000
5/8” 5/16” 1104 1200 1-1/8”-7 4200
3/4” 3/8” 1440 1800 1-1/4”-7 6000
Inspect fans exhausting corrosive or contaminated air
within the first month of operation. Fans exhausting
contaminated air (airborne abrasives) should be inspected
every three months. Clean the wheel and air inlets if
material build-up is excessive. Excessive build-up can
cause imbalance and failure of the wheel.
Regular inspections are recommended for fans
exhausting non-contaminated air.
It is recommended the following inspections be
conducted twice per year.
• Inspect bolts and setscrews for tightness. Tighten as
necessary.
• Inspect belt wear and alignment. Replace worn belts
with new belts and adjust alignment as needed. See
Belt and Pulley Installation, page 1.
• Bearings should be inspected as recommended in the
Conditions Chart.
• Inspect for cleanliness. Clean exterior surfaces only.
Removing dust and grease on motor housing assures
proper motor cooling.
Fan Bearings
The fan bearings are provided prelubricated. Any
specialized lubrication instructions on fan labels
supersedes information provided herein. Bearing grease is
a petroleum lubricant in a lithium base conforming to a
NLGI #2 consistency. If user desires to utilize another type
of lubricant, they take responsibility for flushing bearings
and lines, and maintaining a lubricant that is compatible
with the installation.
A NLGI #2 grease is a light viscosity, low-torque, rust-
inhibiting lubricant that is water resistant. Its temperature
range is from -30°F to 200°F and capable of intermittent
highs of 250°F.
Bearings should be relubricated in accordance with the
condition chart below.
For best results, lubricate the bearing while the fan is in
operation. Pump grease in slowly until a slight bead forms
around the bearing seals. Excessive grease can damage
seal and reduce life through excess contamination and/or
loss of lubricant.
In the event that the bearing cannot be seen, use no more
than three injections with a hand operated grease gun.
Motor Bearings
Motors are provided with prelubricated bearings. Any
lubrication instructions shown on the motor nameplate
supersede instructions below.
Conditions Chart
For moist or otherwise contaminated installations; divide the interval by a
factor of 3. For vertical shaft installations divide the interval by a factor of 2.
RPM Temp °F Greasing Interval
Up to 1000
-30 to 120 6 months
120 to 200 2 months
1000 to 3000
-30 to 120 3 months
120 to 200 1 month
Over 3000
-30 to 120 1 month
120 to 200 2 weeks
Any Speed < -30 Consult Factory
Any Speed > 200 1 week