4
Twin City Engineering Supplement ES-191
Structural Maintenance
All structural components or devices used to support
or attach the fan to a structure should be checked at
regular intervals. Vibration isolators, bolts, foundations,
etc., are subject to failure from corrosion, erosion, and
other causes. Improper mounting can lead to poor
operation characteristics or fan fatigue and failure.
Check metallic components for corrosion, cracks, or
other signs of stress. Concrete should be checked to
insure the structural integrity of the foundation.
Operation Checklist
Verify that proper safety precautions have been followed:
□
Electrical power must be locked off.
Check fan mechanism components:
□
Nuts, bolts and setscrews are tight.
□
Mounting connections are properly made and
tightened.
□
Bearings are properly lubricated.
□
Propeller, drive and fan surfaces are clean and free
of debris.
□
Rotating assembly turns freely and does not rub.
□
Sheaves are on the correct shafts, properly aligned
and properly tensioned.
Check fan electrical components:
□
Motor is wired for proper supply voltage.
□
Motor size is sufficient to power the rotating assembly.
□
Motor is properly grounded.
□
All leads are properly insulated.
Trial “bump”:
□
Turn on power just long enough to start assembly
rotating.
□
Check rotation for agreement with rotation arrow.
□
Listen for any unusual noise.
Run unit up to speed:
□
Bearing temperatures <180°F are acceptable after one
to two hours of operation.
After one week of operation:
□
Check all nuts, bolts and setscrews and tighten if
necessary.
□
Readjust drive tension if necessary.
Figure 5. Vertical Mounting Arrangements
Airflow
Airflow
Airflow
Airflow
4 Mounting
Holes
A
A
Discharge Down
Floor Mount
Discharge Down
Ceiling Hung
Discharge Up
Floor Mount
Discharge Up
Ceiling Hung
View A
NOTE: Fan can be supported with anchor bolts, vibration isolators,
or support rods.
Figure 4. Horizontal Mounting Arrangements
Support
Rods
Suspension
Clips
2 Support
Legs
4 Nuts &
Washers
4 Anchor
Bolts
Fan
Support Rods
Horizontal With
Suspension Clips
Horizontal With
Support Legs
Duct Supported
Installation
