ELECTRICAL WIRING
WARNING
If the fans are going to be used for livestock building ventilation to support life where
failure could result in loss or injury, the user must provide an adequate backup
ventilation system and a failure alarm system. The user must accept the risk of such
loss or injury from failure of the ventilation system.
All wiring must comply with national, state, and local electrical codes. If fans are to be used for livestock ventilation
to support life where failure could result in loss or injury, and continuous ventilation is essential, it is recommended
that the fans be wired to individual electrical circuits, or at least two circuits per room. Any minimum ventilation
fans should be on individual circuits.
Spin the blade assembly by hand. Make
sure that the blade assembly rotates
freely and did not shift during shipment. If
the blades rub in the fan orifice in the
direction of the fan uprights, it will be
necessary to loosen the four (4) 3/8” bolts
that secure the fan x-braces to the fan
uprights, center the blade assembly, and
tighten the bolts to 25-30 ft-lbs torque. If
the blades rub in the direction
perpendicular to the fan uprights, it will be
necessary to loosen the two (2) 3/8” bolts
that secure the blade assembly’s
hexagonal shaft to the fan x-braces,
center the blade assembly, and tighten
the bolts to 25-30 ft-lbs torque.
Next, the fan drive assembly should be
checked for alignment. The fan drive
assembly must be aligned for proper fan
performance and to minimize pulley and
belt wear. Before wiring and operating
the fan, check that the drive pulley, driven
disc and auto belt tensioner are aligned
by using a straight edge such as a scale
or yard stick. If an adjustment is
necessary, loosen the set screw on the
motor pulley and adjust to proper
alignment. Make sure to retighten the
motor pulley set screw before the fan is
operated. See Figure 24.
BLADE AND BELT ALIGNMENT INSTRUCTIONS
Figure 24 — Detailed View of Properly Aligned Fan Sheaves
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