AAON LN-140 - Manual (Page 26)

26
Axial Flow Condenser Fans
Multi-Wing Z Series Aluminum Fan Blade
Pitch Angle Setting Instructions
1. Maintain the balance of fan
Mark the hub castings across a joint, so the
fan hub 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 are replaced into their original position.
Figure 8 - Fan with the HUB on the top and
RET on the bottom.
2. Determine the direction of rotation
Right, R, is clockwise when facing the
discharge side of the fan and Left, L, is
counterclockwise when facing the discharge
side of the fan.
3. Determine the bushing mount location
The bushing mount is the center section of
the hub through which the fan is mounted to
the shaft, and typically contains either
setscrews or a center-tapered hole where the
bushing inserts.
Location A is with the bushing mount on air
inlet side of the fan.
Location B is with the bushing mount on air
discharge side of the fan.
Figure 9 - Bushing Mount Location
4. Determine the pin location groove
Disassemble fan on a flat surface and note in
which groove the pin is located.
Figure 10 - RET with Pin in Groove 4
Bushing
Mount
A B
Bushing
Mount
Bushing Bushing
1 2 3 4