Aerovent IM-170 - Manual

Assembly Procedures
1. Lay hub on a horizontal surface with openings of
shank sockets (Fig. 3) facing up. This is normally
the discharge side of the assembly.
2. Lay blade shank in socket with discharge side of
the blade up. The discharge side of the blade is the
side with the angle setting mark. Line up the index
mark on the blade with the proper angle mark on
the end of the shank socket (Figs. 2 and 4) on the
underside of assembly.
3. Place cap over blade shank with beveled end
toward center. Install U-bolts and elastic nut stops.
Before tightening lock nuts, pull the blade outward
to set the key against the keyway and check angle
setting (Fig. 3).
4. Tighten elastic stop nuts evenly and torque to the
following foot-pounds:
5. Check angle setting to be sure it has not changed
during assembly. If so, loosen lock nuts and reset
angle. Tighten nuts again to proper torque. Do not
over-tighten. Be sure to tighten U-bolts evenly.
Setting Angle With Protractor (optional)
Under most conditions, the preceding assembly proce-
dure using the index marks is of sufficient accuracy.
When greater accuracy is desired, use a level bubble
protractor. Before the final tightening of the nuts, set
the protractor on the angle setting mark. (The hub and
blade assembly must be level for accurate setting.)
Adjust the angle by tapping the shank end with a
mallet. Tighten lock nuts to proper torque. Again check
the angle setting. Rotate propeller to check angle on
each blade in the same location.
Propellers may be assembled so the cap side of the
hub is the inlet side (reverse bore). If blades do not
have the index mark on the discharge side, it is then
necessary to adjust the blade angle with a protractor.
The hub and blades are balanced separately. The
weight distribution throughout the length of the blade
varies slightly. Therefore, the balance is to a constant
moment and blades may be assembled at random
even though the weights are slightly different. Blades
are marked for size and rotation (Fig. 4). “54 R” means
a 54" diameter fan with right-hand rotation.
Adjustable Pitch Propeller Taper-Lock Hub
©2005 Aerovent
Cap and U-Bolt Side Lock Nut Side
Fig. 1
Angle setting index on shank socket. Marked from 10° through 50°. Each
mark is 2°. When hub is viewed as shown above, scale on left side
should be used for right-hand propeller and scale on right side should
be used for left-handed propellers.
Fig. 2
Fig. 4
Blade Size
and Rotation
Trailing
Edge
Angle
Setting
Mark
Index
Mark
Inlet Side Discharge Side
PROPELLER HUB U-BOLT TORQUE (FT/LBS)
DIA. DIA. SIZE ALUMINUM FIBERGLASS
54" – 72" 14" 1/2" 20 30
81" – 144 18" 3/4" 45 50
General Installation, Operation and Maintenance Instructions For Aerovent Products
U-Bolts
Cap
Blade
Elastic Stop Nuts
Blade
Shank
Hub
Index Marks
Key
Keyway
Fig. 3
IM-170
June 1997