Vibration Isolators - Greenheck SQ 60-75 Installation, Operation And Maintenance Manual

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.
Wheel Overlap Dimensions
Model
SQ 60-95
SQ 100-160
BSQ 70-160
BSQ 180-240
BSQ 300-420
CORRECT
Figure 9
Wheel Rotation:
2.
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
Belt Span
unit.
WARNING
Correct direction of wheel rotation is critical.
Reversed rotation will result in poor air performance,
motor overloading and possible burnout.
For BSQ Installation Instructions
Imperial
Used in the USA
6
Centrifugal Inline Exhaust Fans
G - Overlap H - Gap
in. (mm) in. (mm)
CORRECT
1/8
-
(3)
1/4 -
(6)
1/4 -
(6)
3/8
(10) -
1/2
(13) -
G
CORRECT
WRONG
H
Direction of wheel rotation
Belt Span
For BSQ Installation Instructions
Imperial
Belt Span
Deflection = Belt Span Used in the USA
Figure 10
For BSQ Installation Instructions
Imperial
Used in the USA

Vibration Isolators:

3.
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 5
and refer to respective parts list on page 11.
Make certain all connectors are tight and that all
washers are in.
For BSQ Fans:
4.
very important to check the pulleys for proper
alignment. Misaligned pulleys lead to excessive
belt wear, vibration, noise, and power loss. (see
Figure 11).
CORRECT WRONG
G
WRONG
WRONG
Figure 11
For BSQ Fans:
5.
Belt Span
Deflection = Belt Span
64
by loosening four fasteners marked "R" on the
drive frame. (refer to Figure 13 on page 7). 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
For BSQ Installation Instructions
Imperial
Figure 12). Over-tightening will cause excessive
Deflection = Belt Span
Used in the USA
bearing wear and noise. Too little tension will
64 64
cause slippage at start-up and uneven wear.
After fan is moved to
If adjustments are made, it is
G
WRONG WRONG
G
WRONG
WRONG
Belt tension can be adjusted
Deflection = Belt Span
64
Belt Span
Deflection = Belt Span
For BSQ-M Installation Instructions
Metric
Used in China
G
WRONG WRONG
WRONG
Belt Span
Defle
Belt Span
For BSQ-M Installation
Metric
Used in China
Deflec
62.5
For BSQ-M Installation In
Metric
Used in China
®