Greenheck SQ and BSQ (477180) - Manual (Page 7)

7 Centrifugal Inline Fans
®
Pre Start-Up Checks
1. Check all fasteners for tightness. The wheel
should rotate freely and be aligned as shown in
Figure 9. Wheel position is preset and the unit is
tested at the factory. Movement may occur during
shipment, and realignment may be necessary.
Centering can be accomplished by loosening
the bolts holding the inlet (venturi) panel and
repositioning. Wheel and inlet cone overlap can be
adjusted by loosening the setscrews in the wheel
and moving the wheel to the desired position.
2. Wheel Rotation: Direction of wheel rotation is
critical. Reversed rotation will result in poor air
performance, motor overloading and possible
burnout. Check wheel rotation by momentarily
energizing the unit
(all SQ and BSQ
fans have clockwise
wheel rotation when
viewed from top of
fan). Rotation should
be clockwise as
shown in Figure 10
and correspond to the
rotation decal on the
unit.
3. Vibration Isolators: After fan is moved to desired
location, punch out the four knockout holes which
are located on the unit top and bottom panels.
Assemble the brackets to the unit according to
the appropriate drawings on page 6 and refer to
respective parts list on page 12. Make certain all
connectors are tight and that all washers are in.
4. For BSQ Fans: If adjustments are made, it is very
important to check the pulleys for proper alignment.
Misaligned pulleys lead to excessive belt wear,
vibration, noise, and power loss. (see Figure 11).
5. For BSQ Fans: Belt tension can be adjusted by
loosening four fasteners marked “R” on the drive
frame. (refer to Figure 13 on page 8). The motor
plate slides on the slotted adjusting arms. Belt
tension should be adjusted to allow 1/64 inch
of deflection per inch of belt span. For example,
a 15 inch belt span should have 15/64 inch (or
about 1/4 inch) of deflection with moderate thumb
pressure at mid-point between pulleys (see
Figure 12). Over-tightening will cause excessive
bearing wear and noise. Too little tension will cause
slippage at start-up and uneven wear.
Wheel Overlap Dimensions
Figure 9
Model
G - Overlap
in. (mm)
H - Gap
in. (mm)
SQ 60-95 - 1/8 (3)
SQ 100-160 1/4 (6) -
BSQ 70-160 1/4 (6) -
BSQ 180-240 3/8 (10) -
BSQ 300-420 1/2 (13) -
G
H
C
lo
ck
w
is
e
Figure 10
Figure 11
Belt Span
Deflection = Belt Span
64
WRONG WRONG WRONG CORRECT
G
C
lo
c
k
w
is
e
For BSQ Installation Instructions
Imperial
Used in the USA For BSQ-M Installation Instructions
Metric
Used in China
Belt Span
Deflection = Belt Span
62.5
Belt Span
Deflection = Belt Span
64
WRONG WRONG WRONG CORRECT
G
C
lo
c
k
w
is
e
For BSQ Installation Instructions
Imperial
Used in the USA For BSQ-M Installation Instructions
Metric
Used in China
Belt Span
Deflection = Belt Span
62.5
Belt Span
Deflection = Belt Span
64
WRONG WRONG WRONG CORRECT
G
C
lo
c
k
w
is
e
For BSQ Installation Instructions
Imperial
Used in the USA For BSQ-M Installation Instructions
Metric
Used in China
Belt Span
Deflection = Belt Span
62.5
WARNING
Correct direction of wheel rotation is critical. Reversed
rotation will result in poor air performance, motor
overloading and possible burnout.
AVERTISSEMENT
La turbine doit impérativement tourner dans le bon
sens. Une rotation en sens inverse entraînerait de
mauvaises performances de soufflage, une surcharge
du moteur voire un grillage du moteur.
Belt Span
Deflection = Belt Span
64
WRONG WRONG WRONG CORRECT
G
C
lo
c
k
w
is
e
For BSQ Installation Instructions
Imperial
Used in the USA For BSQ-M Installation Instructions
Metric
Used in China
Belt Span
Deflection = Belt Span
62.5