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Figure 33 - Supply Fan Banding
Power Return Axial Flow Fans (16-25 and
30 tons)
Blade Pitch Angle Setting Instructions
Step 1: Determine the new required pitch for
the fan blades
Use the fan program in AAON ECat.
Step 2: Maintain the balance of fan
Mark the HUB/RET castings across a single
joint, so the fan can be reassembled in the
same orientation.
Mark the location of any balancing weight.
Balancing weight will be on the outer bolt
circle, in the form of washers, and/or longer
bolts, or an additional balancing nut.
Number the blades and blade sockets, so that
they can be replaced into their original
positions.
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