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Model SQ/BSQ • Centrifugal Inline Exhaust Fans
®
Maintenance: SQ / BSQ
Installation and maintenance are to be performed
only by qualied personnel who are familiar
with local codes and regulations and who are
experienced with this type of equipment.
Motor maintenance is generally limited to cleaning
and lubrication (where applicable). Cleaning should
be limited to exterior surfaces only. Removing dust
buildup on motor housing ensures proper motor
cooling.
Greasing of motors is only intended when ttings
are provided. Many fractional horsepower motors
are permanently lubricated and should not be
lubricated after installation. Motors supplied with
grease ttings should be greased in accordance
with manufacturers’ recommendations. Where
motor temperatures do not exceed 104ºF (40ºC),
the grease should be replaced after 2,000 hours of
running time as a general rule.
Wheels require very little attention when moving
clean air. Occasionally, oil and dust may accumulate
causing imbalance. When this occurs the wheel and
housing should be cleaned to ensure smooth and
safe operation.
All fasteners should be checked for tightness each
time maintenance checks are performed prior to
restarting unit.
A proper maintenance program will help these units
deliver years of dependable service.
Belt/Bearing Maintenance BSQ Unit
1. Belts tend to stretch after a period of time. They
should be checked periodically for wear and
tightness. When replacing belts, use the same
type as supplied with the unit.
2. Matched belts should always be used on units
with multi-groove pulleys.
3. For belt replacement, loosen the tensioning
device enough to allow removal of the belt by
hand. Do not force belts on or off. This may
cause cords to break, leading to premature belt
failure.
4. Once installed, adjust belts as shown in
“Pre-Starting Checks.”
5. Shaft bearings can be classied in two groups:
relubricating and non-relubricating. All bearings
on standard Model BSQ fans are factory
lubricated and require no further lubrication
under normal use (between -20ºF and 180ºF in a
relatively clean environment).
6. Units installed in hot, humid or dirty locations
should be equipped with special bearings.
These bearings will require frequent lubrication.
Caution should be employed to prevent
overpacking or contamination.
7. Grease ttings should be wiped clean. The unit
should be in operation while lubricating. Extreme
care should be used around moving parts.
8. Grease should be pumped in very slowly until a
slight bead forms around the seal. A high grade
lithium base grease should be used.
Recommended Relubrication
Frequency in Months
NOTE: If unusual environment conditions exist
(extreme temperature, moisture or contaminants)
more frequent lubrication is required.
A good quality lithium base grease, conforming to
NLGI Grade 2 consistency, such as those listed here
may be used.
WARNING
Always disconnect, lock and tag power source
before servicing. Failure to disconnect power
source can result in re, shock or serious injury.
CAUTION
Uneven cleaning of the wheel will produce an out
of balance condition that will cause vibration in the
fan.
WARNING
This unit should be made non-functional when
cleaning the wheel or housing (fuses removed,
disconnect locked off).
Table 3: Grease Manufacturers
Manufacturer Grease (NLGI #2)
U.S. Electric Motors Grease No. 83343
Chevron U.S.A. Inc Chevron SRI Grease #2
Mobil Oil Corporation
Mobilith
Mobil 532
Texaco, Inc.
Premium BRB #2
Texaco Multifak #2
Amoco Oil Co. Rykon Premium #2
Exxon Unirex N2
Shell B Shell Alvania #2
Table 2: Suggested Fan Bearing Greasing Intervals
Interval
(months)
Type of Service
1 to 3
Heavy duty in dirty, dusty locations; high
ambient temperatures; moisture laden
atmosphere; vibration.
3 to 6
12 to 24 hours per day, heavy duty, or if
moisture is present
6 to 12
8 to 16 hours per day in clean, relatively dry
atmosphere
12 to 18
Infrequent operation or light duty in clean
atmosphere