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Installation
Move the fan to the desired location. Check and
tighten fasteners throughout the unit and then fasten
securely through mounting holes provided in the base
angles. The unit must be set level (shimming may be
necessary). Flexible duct connections and vibration
isolators should be used where noise is a factor.
The motor voltage and ampere rating must be checked
for compatibility with the electrical supply prior to final
electrical connection. Supply wiring to the fan must
be properly fused, and conform to local and national
electrical codes.
Discharge Positions
TH
UB
The discharge is factory set as specified by customer
order, however, certain sizes can be rotated to other
discharge positions in the field if necessary. If rotating
the fan housing, accommodations may need to be
made for the fan to drain properly. Removal of the
housing bolts allows the discharge to be rotated to the
clockwise positions above. For DB discharge position,
a portion of the frame angle must be removed.
Fan rotation is always specified from the drive side of
the housing.
Method for Centering Wheel
On belt drive units, centering can be accomplished
by (a) loosening the inlet cone bolts to move the inlet
cone or by (b) loosening the bearings in order to
move the shaft. Wheel and inlet cone overlap can be
adjusted by loosening the wheel hub set screws and
moving the wheel to the desired position. Tighten all
fasteners and set screws securely and realign drive
pulleys after adjustment.
®
V-Belt Drive Installation
1. Remove the protective coating from the end of the
2. Slide sheaves on shafts. Do not drive sheaves on
3. Align fan and motor sheaves with a
4. Place belts over sheaves. Do
5. Adjust the tension until
6. With the fan off and disconnect locked out, adjust
BH
Alignment of Pulleys and Belts
Check pulleys and belts for proper alignment to avoid
unnecessary belt wear, noise, vibration and power
loss. Motor and drive shafts must be parallel and
pulleys in line as shown in Figure 1.
Do not force belt(s). Forcing the
belt(s) will break the cords and
cause belt failure
Figure 1
To avoid motor overheating and possible burnout,
motor load amperes should always be checked and
compared to nameplate rating when fan speed is
increased.
Wheel Rotation
Rotation direction of the wheel is critical. Incorrect
Belt Span
rotation will result in reduced air performance,
Deflection =
64
increased motor loading and possible motor burnout.
Slack
Check wheel rotation by momentarily energizing the
Side
unit and noting if rotation
is in the same direction
as the airflow at the outlet
and conforms to the
rotation decal affixed to
the unit.
Wheels as viewed from
the drive side:
fan shaft using mineral spirits or another similar
solvent. Check to ensure that the shaft is free of
nicks and burrs.
as this may result in bearing damage.
straight edge or string and tighten.
not pry or force belts, as this
could result in damage to
the cords in the belts.
the belts appear snug.
Run the unit for a few
minutes and allow the
belts to "set" properly.
the belt tension by moving the motor pivot plate.
When in operation, the tight side of the belts should
be in a straight line from sheave to sheave with a
slight bow on the slack side.
CORRECT
WRONG
Belt
Span
Centrifugal Single-Width Blower
MOTOR
FAN
FAN
Aligning Sheaves with
a Straight Edge
These are the original drawings on the Illustrator file
when I opened it. The IOM had the wheel layered on
top of the scroll.
I will incorporate the
wheel on the scroll
without creating
an additional
layer in the
InDesign file.
WRONG
WRONG
Airflow
CORRECT
WRONG
WRONG
WRONG
Backward Inclined
Airflow
Centrifugal
Backward Inclined
April 19, 2011
I positioned the wheels onto the scroll outline. The forwar
positioned on the scroll above. This is how was done in th
The wheel was laid on top of the scroll within the InDesign
barb w
MOTOR
5
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