Maintenance
Motor maintenance is generally limited to cleaning and lubrication (where applicable). Cleaning should be limited to exterior surfaces
only. Removing dust buildup on motor housing ensures proper motor cooling. Greasing of motors is only intended when fittings are
provided. Many fractional motors are permanently lubricated and should not be lubricated after installation. Motors supplied with
grease fittings should be greased in accordance with manufacturer’s recommendations. With motor temperatures under 104°F (40°C),
the grease should be replaced after 2000 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.
Unit Size A B C D
60-75 105/8163/4141/287/8
80-95 131/4193/4171/2117/8
100 185/8213/4191/2137/8
120 185/8233/4211/2157/8
130 185/8253/4231/2177/8
140 191/2273/4251/2197/8
160 231/231 281/2227/8
Installation
Upon receiving unit, check for any damage and report it immediately to shipper. Also check that all accessory items are accounted for.
Move fan to desired location and determine position of access panels, discharge, and motor. Make sure inlet and outlet have at least
2.5 times the wheel diameter (duct diameter) before any obstructions like an elbow or transaction. Attach fan to suitable framework as
specified (hanging or base vibration isolators are recommended). See chart below for dimensions of vibration isolator centerlines
(Fig. 1). See Fig. 2 for physical dimensions.
The voltage rating of the motor must be checked for compatibility to supply voltage prior to final electrical connection. Electrical lead-
in wires are then connected to the factory supplied safety disconnect switch. All wiring must conform to local and national codes.
A1in.
C sq.
B sq.
B sq.
1in.
C sq.
Pre-Starting Checks
Check all fasteners for tightness. The
wheel should rotate freely and be
aligned as shown in Fig. 3. Wheel
position is preset and the unit tested
at the factory. However, movement
may occur during shipment, and
realignment may be necessary.
Centering (height alignment) may be
accomplished by loosening the set
screws in the wheel and moving the
wheel to desired position.
Material Approx. Unit
Unit Size A B C Thickness (ga.) Weight (lbs.)
60-75 13 12 87/820 25
80-95 16 15 117/820 40
100 21 17 137/820 60
120 21 19 157/820 75
130 21 21 177/820 90
140 22 23 197/818 105
160 26 26 227/818 130
Overlap 1/4 in.
Gap 1/8 in.
SQ
100-160
SQ
60-95
Vibration Isolator Dimensional Data
SQ Dimensional Data
CA
A
C
Access
Panel
BA
A
AccessPanel
BD
D
B
B
AccessPanel
®
READ AND SAVE THESE INSTRUCTIONS PN 453077
Installation, Operation and Maintenance Manual
All dimensions are in inches.
All dimensions are in inches.
Model SQ Direct Drive
Centrifugal Inline Fans
Fig. 4
Wheel Rotation
Direction of wheel rotation is
critical. Reversed rotation will
result in poor air performance,
motor overloading and possible
burnout. Check wheel rotation
(all SQ fans have CW wheel
rotation when viewed from top of fan) by
momentarily energizing the unit. Rotation should be
clockwise as shown in Fig. 4 and correspond to the
rotation decal on the unit.
C
l
o
c
k
w
i
s
e
