Aerovent IM-140 - Manual

©2005 Aerovent
Bearings
Before the unit is put into operation, tighten bearing collar
setscrews and bearing anchor bolts. Rotate shaft to check
alignment.
All grease lubricated bearings are completely filled with
grease prior to shipment from the factory. This prevents the
condensation of moisture in the pillow block during shipment
and before the unit is installed.
The bearings will discharge excess grease through the seals
for a short period of time after start-up. Do not replace this ini-
tial discharge, because leakage will cease after the excess grease
has been purged from the bearings. Also, the purging of the
excess grease will cause the bearing to heat up, but the heat will
dissipate after the purging.
Observation of the amount of grease expelled from the
bearing at the time of relubrication is the best guide as to
whether the regreasing intervals and amount added should be
altered. When regreasing, use lubrication instructions for fan
ball bearings as outlined in IM-100 which is included with ship-
ment. Avoid mixing different types of grease. Bearings should
be flushed and refilled with fresh grease at approximately one-
year intervals. DO NOT OVER LUBRICATE.
Couplings
Arrangement 7 and 8 direct drive fans, which are shipped com-
pletely assembled with motor and coupling mounted, should be
checked for correct coupling alignment before putting the unit
into operation. Also check lubricant, following manufacturer’s
recommendations for type and amount of lubricant used.
Foundations
A rigid, level foundation is essential for smooth and quiet
operation, good performance, and low maintenance expenses.
Inadequate foundations may lead to excessive vibration in well-
balanced fans, resulting in possible premature failure.
Particular attention must be given to ensure a solid support
for the rotating assembly, particularly in the area of the bearing
and motor supports.
V-Belt Drive
On belt-driven units, position and anchor the motor slide base
firmly to the foundation or bearing base. Mount the motor on
the slide base and move the motor to the position closest to the
the fan. The V-belt drive should be mounted as follows:
Centrifugal Fans
1. Remove dirt and corrosion from fan and motor shafts.
2. Coat bores of sheaves with grease or oil and mount sheaves
on the shafts. Do not force the sheaves on the shafts by ham-
mering as this will damage the fan and motor bearings.
3. Install the belts. Belts should be worked carefully over the
grooves of each sheave until they are properly in place. Belts
should never be forced on with a screwdriver or similar tool
as this will break the cords in the belts. After the belts have
been installed, adjust the sheaves so that both shafts are at
right angles to the belts. See IM-101 for alignment proce-
dure. Once proper alignment is assured, tighten sheaves in
place.
4. Take up slack by adjusting the motor slide base. Proper belt
tension is important. If belts are too tight, undue wear on fan
and motor bearings will result. Insufficient tension shortens
belt life and may cause vibration. Use drive manufacturer’s
recommendations for correct belt tension.
5. IMPORTANT! BEFORE PUTTING THE UNIT
INTO CONTINUOUS OPERATION, INSTALL BELT
GUARD.
6. After several days of operation, check belt tension and
sheave alignment.
Safety Practices
1. Do not operate fan at speeds in excess of factory specified
limits for each construction class.
2. Where applicable, provide inlet or outlet screens to prevent
objects from entering the fan.
3. Provide adequate guards over rotating parts, belt guard, shaft
guards, and coupling guards.
4. Locate a disconnect switch with padlock at fan for mainte-
nance personnel. Also provide means for locking out pri-
mary power where possible.
5. Provide vibration limiting switches to detect sudden change
in fan operation, particularly on critical applications such
as high speed, high temperature, or in erosive or corrosive
atmospheres.
See AMCA Publication 410, Revision 2, for additional safety
practices.
General Installation, Operation and Maintenance Instructions For Aerovent Products
IM-140
June 1997