Greenheck SFD, SFB, SWB and SWD (455308) - Manual (Page 6)

Centrifugal Utility Fans 6
®
Wheel Rotation
Rotation direction of the wheel is critical and incorrect
rotation will result in reduced air performance,
increased motor loading and possible motor burnout.
Check wheel rotation by momentarily energizing the
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:
Approximate Wheel Clearance Dimensions
Unit Size SWB and SWD SFD SFB
SFD SFB SWD
SWB
Series
100
SWB
Series
200
SWB
Series
300
Overlap
Overlap
Tolerance
Radial
Gap
Gap Gap
inches (mm)
6 106 206 — — — 3 ⁄
8
(10) —
7.5 7 107 207 — — — 3 ⁄
8
(10) —
9 9 8 108 208 — — — 1 ⁄
2
(13) 1 ⁄
2
(13)
10 10 10 110 210 3 ⁄
8
(10) 1 ⁄
4
(6) 5 ⁄
32
(4) 1 ⁄
2
(13) 1 ⁄
2
(13)
12 212 3 ⁄
8
(10) 1 ⁄
4
(6) 5 ⁄
32
(4) — 1 ⁄
2
(13)
13 113 213 7 ⁄
16
(11) 1 ⁄
4
(6) 5 ⁄
32
(4) — 1 ⁄
2
(13)
15 15 115 215 1 ⁄
2
(13) 1 ⁄
4
(6) 5 ⁄
32
(4) — 1 ⁄
2
(13)
16 116 216 1 ⁄
2
(13) 1 ⁄
4
(6) 5 ⁄
32
(4) — —
18 18 118 218 5 ⁄
8
(16) 3 ⁄
8
(10) 5 ⁄
32
(4) — 1 ⁄
2
(13)
20 120 220 5 ⁄
8
(16) 3 ⁄
8
(10) 5 ⁄
32
(4) — 5 ⁄
8
(16)
22 222 11 ⁄
16
(18) 3 ⁄
8
(10) 5 ⁄
32
(4) — 5 ⁄
8
(16)
124 224 3 ⁄
4
(19) 3 ⁄
8
(10) 5 ⁄
32
(4) — —
25 — — — — 3 ⁄
4
(19)
27 327 7 ⁄
8
(22) 1 ⁄
4
(6) 3 ⁄
16
(5) — 3 ⁄
4
(19)
30 330 15 ⁄
16
(24) 3 ⁄
8
(10) 3 ⁄
16
(5) — 3 ⁄
4
(19)
333 1 1 ⁄
16
(27) 3 ⁄
8
(10) 3 ⁄
16
(5) — —
336 1 3 ⁄
16
(30) 3 ⁄
8
(10) 3 ⁄
16
(5) — —
340 1 1 ⁄
4
(32) 3 ⁄
8
(10) 1 ⁄
4
(6) — —
344 1 7 ⁄
16
(37) 3 ⁄
8
(10) 5 ⁄
16
(8) — —
349 1 9 ⁄
16
(40) 1 ⁄
2
(13) 5 ⁄
16
(8) — —
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.
NOTE
Models SFD and SFB units should be operated only
when attached to the system for which they were
designed. Without proper system static pressure,
the motor could be overloaded.
Backward Inclined
SWD and SWB Series 100, 200 & 300
Forward Curved
SFD and SFB
Airfoil
SWB 327 - 349
Airflow
Airflow
R
o
ta
ti
o
n R
o
ta
tio
n R
o
ta
ti
o
n
Airflow
Figure 2
Model SWB / SWD
Radial
Gap
Overlap
Wheel
Figure 3
Model SFD / SFB
Gap
Wheel
Wheels
Wheels must rotate freely and not rub on
the inlet venturi. Model SWB and SWD
wheels overlap the inlet venturi as shown
in Figure 2. Refer to the Approximate
Wheel Clearance Dimensions table for
the proper dimensions for wheel overlap
and radial gap.
Models SFD and SFB wheels do not
overlap the venturi, but have a gap
between the inlet venturi and the wheel,
see Figure 3. Wheel position is preset at
the factory and the unit is test run. Wheel
movement may occur during shipment or
installation and wheel alignment may be
necessary.