6
Figure 3.
Alignment
Mount belts straight. Shafts must be parallel
And sheaves in alignment to prevent belt wear.
Figure 4.
Two Groove Sheaves
Two groove adjustable sheaves must be opened
the same number of turns on both sides.
Figure 5
. Belts
Do not force belt. Forcing the belt will break the
cords and cause belt.
Maintenance
Installation and maintenance are to be
performed only by qualified personnel who are
familiar with local codes and regulations and
experienced with this type of equipment.
CAUTION:
Sharp edges and screws
are a potential injury hazard. Avoid
them.
WARNING:
Hazardous moving parts.
Unit may contain protected fan motor
which may start automatically and
cause injury. Allow time for reset.
Disconnect power before servicing.
Preventive maintenance is the best way to
avoid unnecessary expense and inconvenience.
Start-up and routine maintenance should cover
the following items:
a. Tighten all setscrews, bolts and wire
connections.
b. Check belt tension and sheaves for wear.
c. Lubricate fan bearings (see Tables 1 and 2).
d. Cleaning of unit, wheel and damper (if
present).
All motors containing ball bearings
are permanently lubricated from the
factory. No additional maintenance is
required.
1. Before performing any maintenance on the
fan, be sure power is turned off and locked
in the OFF position at the service entrance.
2. Ventilators should be carefully checked at
least once a year. For critical or rugged
applications, a routine check every two or
three months is suggested.
3. All motors supplied with Fantech ventilators
carry a one-year limited warranty from date
of shipment. For repairs within the warranty
period, the motor must be taken to the
motor manufacturer’s authorized service
dealer. Contact your representative for
additional warranty details.
4. A periodic motor check should consist of
spinning the motor shaft with the power
off to be sure the motor turns freely and
the bearings run smoothly. The belt on belt
driven units should be removed from the
motor sheave.
5. When removing or installing a belt, do not
force the belt over the sheave. Loosen the
motor mount so that the belt can be easily
slipped over the sheave.
6. The belt on belt driven units should be
removed and carefully checked for glazing,
cracks, ply separation or irregular wear.
A small irregularity in the contact surface
of the belt will result in noisy operation. If
any of these defects are apparent, the belt
should be replaced. Check the sheaves also
for chipping, dents or rough surfaces which
could damage the belt.
7. The correct belt tension is important. Too
tight of a belt will result in excess bearing
pressure on the motor bearings and shaft
pillow blocks and may also overload the
motor. Too loose of a belt will result in
slippage which will quickly “burn” out belts.
A belt should feel “live” when thumped,
approximately W belt deflection (3 to 5 lb.)
when subject to finger pressure at midpoint
between sheaves.
8. The belt alignment should also be checked to
be sure the belt is running perpendicularly
to the rotating shafts. Fan and motor shafts
must be parallel. Improper alignment will
result in excessive belt wear.
9. Check sheave setscrews to ensure
tightness. Proper keys must be in keyways.
10. Do not readjust fan RPM. If sheaves are
replaced, use only sheaves of identical size
and type.
11. If unit is to be left idle for an extended
period, it is recommended that belts be
removed and stored in a cool, dry place to
avoid premature belt failure.
12. The standard pillow block bearings on belt
driven ventilators are factory lubricated and
are provided with external grease fittings.
Lubrication annually is recommended, or
more frequently if needed (see Table 1).
It is recommended to add fresh grease at
start-up, but do not over-grease. Use only
1 or 2 shots of a recommended lubricant
with a hand gun in most cases (see Table 2).
Maximum hand gun rating 40 P.S.I. Rotate
bearings during lubrication where good
safety practice permits.
CAUTION:
Greases of different soap
bases (lithium, sodium, etc.) may not
be compatible when mixed. Prevent
such intermixing by completely purging
the bearing of old greases.
The most frequent causes of bearing
failure are not greasing often enough,
using an excessive quantity of grease,
or using incompatible greases.
Excessive vibration, especially if the
bearing is not rotating, will also cause
bearings to fail. Bearings must also be
protected from water and moisture to
avoid internal corrosion.
13. During the first few months of operation it
is recommended that the bearing setscrews
be checked periodically to ensure that they
are tight.
14. The rotating wheel requires particular
attention since materials in the air being
handled can build up on the blades to
cause destructive vibration or weaken the
structure of the wheel by corroding and/or
eroding the blade metal. Regular inspection
and corrective action at intervals determined
by the severity of each application are
essential to good service life and safety.
INCORRECT
CORRECT
