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Model SQ/BSQ • Centrifugal Inline Exhaust Fans
®
WARNING
The fan has been checked for mechanical noises
at the factory prior to shipment. If mechanical
noise should develop, suggested corrective ac-
tions are offered in the Troubleshooting section.
IMPORTANT
Over tightening will cause excessive bearing wear
and noise. Too little tension will cause slippage at
start-up and uneven wear.
IMPORTANT
Adjust (tighten) belt tension after the rst 24-48
hours of operation.
6. The adjustable motor pulley is factory set for
the RPM specified. Speed can be increased by
closing or decreased by opening the adjustable
motor sheave. Two groove variable pitch pulleys
must be adjusted an equal number of turns open
or closed. Any increase in speed represents a
substantial increase in the horsepower required
by a unit. Motor amperage should always be
checked to avoid serious damage to the motor
when speed is varied.
Belt Span
Deflection =
Belt Span
64
WRONGWRONGWRONGCORRECT
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Figure 16
Figure 17
NOTE: Identical fasteners on opposing side must
also be loosened.
R
Operation: SQ / BSQ
1. Before starting up or operating fan, check all
fasteners for tightness. In particular, check
the setscrews in wheel hub (and pulleys, if
applicable).
2. While in the OFF position or before connecting
the fan to power, turn the fan wheel by hand
to be sure it is not striking the venturi or any
obstacle.
3. Start the fan and shut it off immediately to check
rotation of the wheel with directional arrow in the
motor compartment, see Figure 14.
4. When the fan is started, observe the operation
and check for any unusual noises.
5. With the system in full operation and all
ductwork attached, measure current input to the
motor and compare with the nameplate rating to
determine if the motor is operating under safe
load conditions.
6. Keep inlets and approaches to fan clean and
free from obstruction.
Inspection: SQ / BSQ
Inspection of the fan should be conducted at the
rst 30 minute and 24 hour intervals of satisfactory
operation.
30 Minute Interval
Inspect bolts, setscrews and motor mounting bolts.
Adjust and tighten as necessary.
24 Hour Interval
Check all internal components. On BSQ unit only,
inspect belt alignment and tension. Adjust and
tighten as necessary.