AAON LL-540 User Manual
Page 40
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40
5. Determine whether the pin is in the HUB
or RET
Figure 19 - Fan HUB and RET Castings
6. Determine the current blade pitch and the pin location for the new blades
Table 5 - Return/Exhaust Fan Pin Location
Type
Bushing
Mount
Blade Pitch Angle
20°
25°
28°
30°
33°
35°
38°
40°
45°
50°
5Z
A
-
RET
-
RET
RET
RET
HUB
HUB
HUB
HUB
B
-
HUB
-
HUB
HUB
HUB
RET
RET
RET
RET
Table 6 - Return/Exhaust Fan Pin Location
Type
Rot.
Blade Pitch Angle
20°
25°
28°
30°
33°
35°
38°
40°
45°
50°
5Z
R
-
4
-
3
2
1
4
3
2
1
L
-
1
-
2
3
4
1
2
3
4
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