Cleaning and Adjustments. The entire fan should
be cleaned as necessary to remove accumulated dust, dirt
and other debris which may collect on the blades or other
fan parts. For belt drive units, the belt should be inspected
and tension adjusted (see below). Be sure to check for belt
misalignment which can result in excessive wear and
premature failure. Belt tension should be rechecked after
the rst 8-10 hours of use and periodically thereafter. If rust
or corrosion are found anywhere on the fan package, the
aected area should be thoroughly cleaned and renished.
Speed and Air Volume Adjustment. On belt drive
models equipped with an adjustable pitch motor pulley, the
pitch setting made at the factory operates the fan at the
maximum safe load for the motor. Do not close the pulley to
increase fan speed as this will overload the motor, causing
motor damage and/or motor trip-out. The pulley may be
opened to reduce fan speed and thus decrease CFM. If
further information is required contact your nearest
American Coolair representative.
Belt Replacement and Tensioning.
Applicable for Belt Drive units only
a) When replacing the belt, make sure the new belt matches
both the belt section type (4L or A) and size (length) exactly
with the old belt. To replace the belt, detach the entire blade
assembly from the frame by removing bolts which connect
the shaft to the X-Brace. Tilt or lift the blade assembly just
enough for the belt to clear the end of the shaft. If the fan’s
location makes detachment dicult, it may be possible to
remove the old belt and replace a new one by slipping the
belt over the blade tips - one at a time. Loosening the bolts
holding the shaft to the X-Brace simplies this procedure.
When replacing belt, do not roll it over the pulleys under
tension, as this may damage the belt and cause premature
failure.
Notice : Do not return damaged or defective parts to American Coolair
Corp without prior authorization. If repairs under warranty are claimed, see
warranty terms in the American Coolair catalog. Claims for warranty repairs
regarding the motor should be made directly with the motor manufactur-
er’s authorized repair center.
Form No. 520-40-3 (May, 2015)
b) The belt should be inspected and belt tension adjusted at
regular intervals. To check belt tension, place a nger
midway between fan pulley and motor pulley and push the
belt inward. For proper tension, the belt should deect
about 1/2” at approximately 5 lb. force. To adjust to the
proper tension, loosen the motor bracket bolts and tap
bracket up or down as necessary. Check the alignment of
the belt, motor pulley and fan pulley, and re- tighten all
motor bracket bolts.
Repair Parts.
Belts. Belts are standard V-belts used on industrial machines
and replacements may be obtained through local industrial
supply houses. To install belts, see previous instructions.
Motors. Motor repairs should be performed only by an
authorized motor repair center. Contact the motor
manufacturer or American Coolair for certied repair
locations.
Bearings. Field replacement of bearings is not
recommended. Contact your American Coolair
representative for more information.
Blades. If one or more of the blades of the blade assembly is
damaged, contact your American Coolair representative. If
an unbalanced condition develops, thoroughly clean the
blades to remove dirt and other build up. If unbalance
persists, contact your American Coolair representative.
Lubrication. Fan bearings are factory lubricated for
extended service. Relubrication as a part of regular mainte-
nance is not necessary. For lubrication of the electric motor,
see the instructions supplied by the motor manufacturer.
CAUTION : Over tensioning the belt will cause the belt
and bearings to fail in a short period of time. Do not
over tension.
Installation Instructions—Other Side
Operation and Maintenance Instructions
for Type PT Power Tube Fans
