17
ADJUSTABLE BELT DRIVE BLOWER
Personal injury hazard.
Use extreme care during the following procedures
and obey Safety Information.
Failure to do so may result In personal Injury.
The following safety rules MUST always be followed
when working near belt drive.
Always Turn the Power Off
1. Turn the power to the unit OFF before you begin
working on it.
Always Wear Protective Clothing
2. NEVER wear loose or bulky clothes, such as
neckties, exposed shirttails, loose sleeves, or lab
coats around belt drives. Wear gloves while
inspecting sheaves to avoid nicks, burrs, or
sharply worn pulley edges.
The blower speed is changed by adjusting the
variable speed pulley mounted on the blower
motor.
If the blower speed needed is different than the
speed of the blower as shipped, follow the steps
below to change the blower speed. Before
changing the blower speed, read the above
safety rules first.
3. Turn electric power OFF.
4. Remove the side blower access panel.
Loosen the four motor mount bolts.
6. Turn the motor adjustment bolt counterclockwise
until the belt is slack enough to come off easily.
7. Remove the belt. Do NOT pry off belt.
8. Loosen set screw(s) on the outer half of the
adjustable pulley.
9. The unit has one of two different types of
adjustable pulleys.
10. Remove key if unit has a keyway type pulley.
11. To set the blower for a desired CFM (L/s), first
turn the outer half of the adjustable pulley
clockwise until it meets the inner half of the
pulley.
12. Turn the outer half of the adjustable pulley
counter clockwise the correct number of turns to
obtain the desired CFM (L/s).
NOTE: To increase the blower speed, turn the
outer half of the adjustable pulley clockwise. To
decrease the blower speed, turn the outer half of
the adjustable pulley counter clockwise.
13. Replace key if unit has keyway type pulley.
14. Tighten set screw(s).
15. Put on belt.
16. Turn motor adjustment bolt clockwise until the
belt has enough tension at the proper deflection.
Use one of the commercially available belt
tension gauges to set the correct tension at the
proper deflection.
17. Use a straight edge (angle iron, straight piece of
board or anything with a good straight surface or
edge) to check the alignment of the blower pulley
with blower motor pulley.
18. It may be necessary to back the tension off the
belt temporarily and tighten one of the motor
mount bolts before it is possible to adjust the
angle of the blower motor.
19. Tighten all four blower motor mount bolts
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