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I Combination Units Installation Instructions
6. Adjustable Belt Drive Blower
Personal injury hazard.
Use extreme care during the following proce-
dures and obey Safety Information.
Failure to do so may result in personal injury.
I
The following safety rules MUST always be followed when
working near belt drive.
Always Turn The Power Off
Turn the power to the unit OFF before you begin work-
ing on it.
Always Wear Protective Clothing
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.
Ifthe blower speed needed is different than the speed of the
blower as shipped, follow the steps below to change the I
blower speed. Before changing the blower speed, read the
I
above safety rules first.
5. Turn electric power OFF.
6. Remove the side blower access panel (see Figure 1
on Page 4)
10. Loosen set screw(s) on the outer half of the adjustable
pulley.
The unit has one of two different types of adjustable
pulleys (see Figure 12 and Figure 13).
Figure 12 Adjustable Pulley (Keyway Type)
This keyway pulley has a removable key and two keyways cut through
the threads of the pulley hub. The keyways limit this type of pulley to
half turn adjustments.
Adjustable Pulley (Threaded Keys)Figure 13
Figure 11 I Motor Mount Assembly
Adjustable
Pulley
Motor Mount
Bolts (4)
__ Adjustment
Bolt
1054584
7.
8.
Loosen the four motor mount bolts.
Turn the motor adjustment bolt counterclockwise until
the belt is slack enough to come off easily (see
Figure 11).
9. Remove the belt. Do NOT pry off belt.
This type of pulley has non-removable threaded keys that ride on the
threads of the pulley shaft. This allows a full 360 °range of adjustment.
11. Remove key if unit has a keyway type pulley.
12. 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.
13. Turn the outer half of the adjustable pulley counter-
clockwise the correct number of turns to obtain the de-
sired CFM (L/s).
NOTE: To increase the blower speed, turn the outer half of
the adjustable pulley clockwise. To decrease the blower
513 01 1002 00 Ff_
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