Greenheck Sidewall Propeller Fans (471755) - Manual (Page 5)

Sidewall Propeller Fans 5
DANGER
Always disconnect, lock and tag power source before
installing or servicing. Failure to disconnect power
source can result in fire, shock or serious injury.
DANGER
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.
Deflection =
Belt Span
64
Slack
Side
Belt
Span
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
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 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.
The filters also require periodic cleaning. The 2 inch
(51 mm) washable aluminum filters are accessed
through the bolted access panel.
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
made. Misalignment
of pulleys will result
in premature belt
wear noise, vibration
and power loss.
Routine Maintenance
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
Premature belt failures are frequently caused by
improper belt tension (either too tight or too loose) or
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.
CORRECT WRONG
WRONG WRONG
®