Centrifugal Inline Fans
8
®
Maintenance: SQ-M / BSQ-M
Installation and maintenance are to be performed only
by qualified 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 for model BSQ-M. Motor cleaning should be
limited to exterior surfaces only. Removing dust buildup
on the motor housing ensures proper motor cooling.
Greasing of motors is only intended when fittings are
provided. Many fractional horsepower motors are
permanently lubricated and should not be lubricated
after installation. Motors supplied with grease fittings
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.
DANGER
Always disconnect, lock and tag power source before
servicing. Failure to disconnect power source can
result in fire, shock or serious injury.
IMPORTANT
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).
Torque Specifications for Bushings
Refer to the torque values imprinted on the hub as
shown in Figure 12 for torque specifications. If there is
no torque value on the hub, refer to the table below.
Belt/Bearing Maintenance BSQ-M 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-Start-Up Checks.”
5. Shaft bearings can be classified in two groups:
permanent lubricated and re-lubricating bearings.
All bearings on standard model SQ-M fans are
permanent lubricated bearings and require no
further lubrication under normal temperature use.
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 fittings 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.
Figure 12
Torque Values For
SQ-M & BSQ-M
Set Screw
Torque
M8
11.3 Nm
M10
25.4 Nm
