3. Check the blower fan for proper
alignment. The fan should be centered in the
housing. The belt should be tightened so
that you can push down on the belt with one
finger depressing the belt one inch in the
center between the pulleys (Fig. 3).
4. The pulleys should be lined up so that a
straightedge will lay flat against the sides of
both pulleys (Fig. 5). If the pulleys are out of
alignment they must be aligned prior to
operation of the unit. Incorrect alignment will
result in premature belt failure and excessive
pulley wear.
FAN SHAFT POSITION ADJUSTMENT
If the shaft is not properly centered, the fan may scrape against the scroll. To center the assembly,
loosen the Allen set screw on the locking collar of each fan shaft bearing. Slide the shaft into the
proper position and replace the locking collar.
To replace the collar, push it against the
inner race of the bearing, turn the collar in
the direction of the shaft rotation until tight,
then tighten the set screws. Tightening the
locking collar in the direction of the fan
rotation will result in further tightening of the
collar should the set screw work loose.
FAN WHEEL ADJUSTMENT
If the fan is not centered in the scroll and/or
is rubbing against the scroll, it should be
repositioned. Loosen the square head bolt
holding the fan wheel hub to the shaft.
Position the fan wheel in the center of the
fan housing and tighten the locking bolt.
Clearances between the wheel and housing
should be the same on each side.
6
INSTALLATION
BELT TENSION
(1" Maximum)
BLOWER ROTATION
Fig. 3
Fig. 4
!
Do not change the pulley sizes on the unit without factory
authorization. The motor size and blower RPM are balanced with
the standard filter configuration to provide optimum performance
and protect the motor from overload and permanent damage.
ADJUSTMENTS
