Page 22
FIGURE 11
BLOWER SPEED ADJUSTMENT
BLOWER PULLEY
MOTOR
PULLEY
SET SCREW
KEY
BLOWER
TO INCREASE CFM
TURN PULLEY CLOCKWISE
TO DECREASE CFM
TURN PULLEY
COUNTERCLOCKWISE
MOTOR
MOUNTING PLATE
LOCKING BOLTS
(2-TOP & BOTTOM)
TO INCREASE BELT TENSION
1 - Loosen 2 locking bolts.
2 - Pull motor mounting plate.
3 - Tighten motor mounting
plate so plate is vertical.
Check Belt Tension
Overtensioning belts shortens belt and bearing life. Check
belt tension as follows:
1- Measure span length X. See figure 12.
2- Apply perpendicular force to center of span (X) with
enough pressure to deflect belt 1/64” for every inch of
span length or 1.5mm per 100mm of span length.
Example: Deflection distance of a 40” span would be
40/64” or 5/8”.
Example: Deflection distance of a 400mm span would
be 6mm.
3- Measure belt deflection force. For a used belt, the
deflection force should be 5 lbs. (35kPa). A new belt
deflection force should be 7 lbs. (48kPa).
A force below these values indicates and underten-
sioned belt. A force above these values indicates an
overtensioned belt.
MEASURE BELT TENSION
DEFLECTION 1/64” PER INCH OF SPAN
OR 1.5mm PER 100mm OF SPAN
FORCE
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