Maintenance; Fasteners And Setscrews - Greenheck AER Installation, Operation And Maintenance Manual

Maintenance

Always disconnect, lock and tag power source before
installing or servicing. Failure to disconnect power
source can result in fire, shock or serious injury.
Pour écarter les risques d'incendie, de choc électrique
ou de blessure grave, veiller à toujours débrancher,
verrouiller et étiqueter la source de courant avant
l'installation ou l'entretien.
Once the fan has been put into operation, a periodic
maintenance program should be set up to preserve the
reliability and performance of the fan. Items to be
included in this program are belts, bearings, fasteners
and setscrews, lubrication, and removal of dust and dirt.
Belts
Do not force belt(s). Forcing the
Premature belt failures are frequently caused by
belt(s) will break the cords and
improper belt tension (either too tight or too loose) or
cause belt failure
misaligned pulleys. The proper tension for operating a
V-belt is the lowest tension at which the belts will not
slip at peak load conditions. For initial tensioning, the
proper belt deflection halfway between pulley centers
is 1/64 inch (0.4 mm) for each inch of belt span. For
example, if the belt span is 64 inches (1626 mm),
the belt deflection should be one inch (25 mm) using
moderate thumb pressure at midpoint of the drive. See
figure shown below.
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Slack
Side
Check belt tension two times during the first 24 hours
of operation and periodically thereafter. To adjust belt
tension, simply loosen four fasteners (two on each side
of the motor plate) and slide the motor plate away from
the fan shaft until proper belt tension is attained. On
some fans, fasteners attaching the motor to the motor
plate must be loosened in order to adjust the belt.
It is very important
that the drive pulleys
remain in proper
alignment after
adjustments are
Belt Span
Belt
64 made. Misalignment
Span
of pulleys will result in
premature belt wear
noise, vibration and
power loss.
®
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DANGER
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Belt Span
Deflection =
64
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Bearings (for belt drive fans only)
Bearings are the most critical moving part of the fan
and should be inspected at periodic intervals. Locking
collars and setscrews, in addition to fasteners attaching
the bearings to the bearing plate, must be checked for
tightness. In a clean environment and temperatures
above 32ºF (0ºC) and below 200ºF (93ºC), fan shaft
bearings with grease fittings should be lubricated semi-
annually using a high-quality lithium based grease. If
unusual environmental conditions exist, temperatures
below 32ºF (0ºC) and above 200ºF (93ºC), moisture or
contaminants, more frequent lubrication is required.
With the unit running, add grease very slowly with a
manual grease gun until a slight bead of grease forms
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at the seal. Be careful not to unseat the seal by over
lubricating or using excessive pressure. Bearings
without grease fittings are lubricated for life.

Fasteners and Setscrews

Any fan vibration has a tendency to loosen mechanical
fasteners. A periodic inspection should include checking
all fasteners and setscrews for tightness. Particular
attention should be paid to setscrews or taper-lock
bushings attaching the propeller to the motor shaft
and the motor shaft to the bearings. Loose bearing
setscrews will lead to premature failure of the fan shaft.
In addition, check all fasteners attaching the motor to
the motor plate.
Lubrication
Refer to the paragraph on bearings for bearing
lubrication. Many fractional horsepower motors installed
on the smaller fans are lubricated for life and require
no further attention. Motors equipped with oil holes
Belt
Span
should be oiled in accordance with the manufacturer's
instructions printed on the motor. Use a high grade SAE
20 machine oil and use caution not to over lubricate.
Motors supplied with grease fittings should be greased
according to directions printed on the motor.
Removal of Dust and Dirt
Dirt clogs cooling openings on the motor housing,
contaminates bearing lubricant and collects on propeller
blades causing severe imbalance if left unchecked.
The exterior surface of the motor, fan panel and entire
propeller should be thoroughly cleaned periodically.
Use caution and do not allow water or solvents to enter
the motor or bearings. Motors or bearings must not be
sprayed with steam or water.
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The filters also require periodic cleaning. The 2 inch
(51 mm) washable aluminum filters are accessed
through the bolted access panel.
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Sidewall Propeller Fans 5