4
McQuay IM 777-7
Introduction
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 per-
sonal 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
General Rules of
Tensioning‚ page 30
.
