Unit Storage
•
Store on a level surface in a clean, dry location where
temperature can be controlled if possible .
• Pack fan and motor bearings (unless motor bearings are
sealed) with compatible grease with the shaft stationary.
After grease has been installed, rotate shaft about 10
rotations .
• Isolate unit from shock and vibration .
• Once a month, rotate shaft a minimum of 10 revolutions .
Insure the stopped position is different than the original
position .
•
Coat shafts with lubricant as needed to prevent corrosion.
• A descant bag may be hung in the interior of the unit to
minimize corrosion in humid storage environments . Do
not clean galvanized steel surfaces with oil dissolving
chemicals . This may remove the protective coating and
accelerate corrosion .
•
Do not allow coverings to trap moisture on galvanized
surfaces .
Belt-Driven fans
• Reduce belt tension by at least 50% or remove the belts .
Remove belts if they will be subjected to temperatures
exceeding 85° F to avoid deterioration .
•
Remove belt guard when adjusting belts
• Reduce belt tension prior to removing or installing belts .
• Removing or installing tensioned belts may cause
personal injury and damage to the sheaves, belts,
bearings or shafts .
•
Adjustable sheaves should be opened as wide as
possible and the adjustment threads lubricated so they
do not corrode . Be careful not to put lubricant on the belt
running surface
Prior to start up
•
Set screws on bearings, fan wheels, and sheaves need to
be checked for proper torque . Also check bolt torque for
any taper lock hubs either on the wheel or sheaves.
•
Check sheaves for corrosion. Significant corrosion can
cause belt or sheave failure .
•
Purge old grease from fan bearings while rotating the
shaft to distribute the new grease evenly and prevent
bearing seal failure .
• Correctly align and tension belts . See
on page 42
.
IM 672-11 • VISION AIR HANDLING UNIT
4
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nTroduCTIon
