8’ - 24’ POWERFOILPLUS™, POWERFOIL™, & WICKERBILL FANS
WWW.BIGASSFAN.COM ©2010 DELTA T CORP. DBA BIG ASS FAN ALL RIGHTS RESERVED
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WWW.BIGASSFAN.COM ©2010 DELTA T CORP. DBA BIG ASS FAN ALL RIGHTS RESERVED
8’ - 24’ POWERFOILPLUS™, POWERFOIL™, & WICKERBILL FANS
Preparing the Work Site
Mechanical Installation
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A 24 ft (7.3 m) Powerfoil fan (our largest model) weighs, at maximum, 415 lbs (188 kg). A scissor lift, or other suitable means for
lifting the weight of the fan, and up to two (2) installation personnel will be required.
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Big Ass Fans can only be hung from an I-beam or angle irons. For specific requirements, see the Mechanical Installation section
starting on p. 11. Do not mount the fan to single purlins, trusses, or bar joists. Consult a structural engineer for installation methods
not covered in this manual.
CAUTION: Mount fan only to an
angle iron or I-Beam.
Angle Iron
I-Beam
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To reduce the risk of injury to persons, install the fan so that the blades are at least 10 ft (3.05 m) above the floor.
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The fan installation area must be free of obstructions such as lights, cables, sprinklers, or other building structure. The fan blades
should have at least 2 ft (0.61 m) of clearance from any obstructions.
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Do not install the fan where it will be continuously subjected to high winds, such as under a high velocity HVAC system. The
distance between the fan and the HVAC equipment (or other air-moving equipment) should be no less than 2x the fan’s diameter
when measured from the center of the fan to the equipment.
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The distance between multiple fans should be no less than 2.5x the fans’ diameter when measured from the centers of the fans.
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The mounting system must be able to withstand the torque forces generated by the fan. A 24 ft diameter fan generates nearly 300
ft·lb
f
(406.7 N·m) of torque during operation.
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Fans mounted on lightweight I-beams (common in steel buildings) could cause the beam to flex and the fan to move significantly
during operation. If this flexing causes a clearance problem we suggest installing a stiffening strut to a nearby beam.
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If the fan’s extension tube is 4 ft (1.2 m) or longer, the fan’s lateral movement must be secured using guy wires (see p. 21 for more
information). If the fan is close to any building fixtures it is recommended to secure the fan with guy wires as a safety measure.
Electrical Installation
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To reduce the risk of electric shock, wiring should be performed by a qualified electrician! Incorrect assembly can cause electric
shock or damage the motor and the controller!
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The installation of a Big Ass Fan must be in accordance with the National Electrical Code, ANSI/NFPA 70-1999, and all local codes.
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Acceptable Unshielded Cable Types: Stranded THHN / THNW, rated for 600V & 158°F-194°F (75°-90°C) in metallic conduit.
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Acceptable Shielded Cable Types: RHH / RHW-2, rated for 600V & 158°F-194°F (75° to 90°C); Belden 29501 through 29507; RHH
/ RHW-2, tray rated for 600V & 158°F-194°F (75°-90°C); Shawflex 2ACD / 3ACD or equivalent.
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MC cable (stranded or solid core) may not be used for fan output/motor input leads.
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The motor leads from the fan control to the fan cannot be greater than 400 ft (121.9 m).
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The fan must be visible from its controller unless a suitable means of disconnect is used at the motor.
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The output/motor leads cannot share the same conduit or piping as the AC power supply. AC supply feeds for one fan controller
can share the same conduit with AC supply feeds for one or more controllers.
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AC supply feeds for a fan controller and the output/motor leads for the same fan may not share a conduit.
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AC supply feeds for one fan controller may not share conduit with output/motor leads from one or more controllers/VFDs.
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All unused conductors that share a conduit with the AC supply feeds must be grounded on both ends.
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Controller output/motor input leads canot share a conduit with any other controller’s output/motor leads.
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Controller output/motor input leads cannot share a conduit with any other controller’s AC supply feed.
