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PROBLEM
Fan wobbles.
Fan moves
backwards and
forwards when
turned on.
Refer to page 23-DYNAMIC BLADE BALANCING KIT.
•
Warning: If any of the blades are bent or damaged,
•
do not use the unit any further. All blades are weighed
and grouped by weight. Natural woods vary in
density which could cause the fan to wobble even
though all blades are weight-matched. The following
procedures should eliminate most of the wobble.
Check for wobble after each step.
• Check that all blades are screwed firmly into blade
brackets.
• Check that all blade brackets are tightened securely
to motor.
• Make sure that canopy and hanger bracket are
tightened securely to ceiling outlet box and outlet
box is mounted firmly to ceiling joist.
• Most wobble problems of fan are caused when
blades are not in equal level. To check the blade
levels, select a point on the ceiling above the tip of
any blade. Measure the distance from the ceiling to
the blade tip, to an accuracy of 1/8" (3 mm). Rotate
the blades until the next blade is in the measuring
position. Repeat measurement for each blade. If all
blade levels are not equal, you can adjust blade
levels by the following procedure. To adjust a blade
tip down, insert a washer (not supplied) between the
blade and blade bracket at the screw closest to the
motor. To adjust a blade tip up, insert washer (not
supplied) between the blade and blade bracket at
the two screws farthest from the motor.
• Interchanging two adjacent blades could
redistribute the weight and possibly result in smoother
operation.
• This is normal start-up procedure for DC motor fans.
The partial movement during start-up is the result
of the DC motor aligning the internal magnetic
poles for proper motor operation. This design saves
electricity and allows the fan to operate much
quieter than standard AC motor fans.
22
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