Open Plenum Array
5
Efficient array performance can be maintained by having the correct radial gap, overlap and wheel alignment. These
items should be checked after the array has been in operation for 24 hours and before start-up after the unit has
been serviced.
Overlap, or offset,
is adjusted
by loosening the wheel hub
from the shaft and moving the
wheel to the desired position
along the motor shaft. The
transition between the inlet
cone and wheel should be as
shown; there is a smooth feel
to the profile when moving from
one component to the other.
Overlap
Wheel Back
to Inlet Cone
Radial Gap, Overlap and Wheel Alignment
Backward Curved Aluminum Wheel (Mill Finish)
Unit
Size
Overlap
Overall Assembly
Wheel Back to Inlet Cone
inch
mm
inch
mm
315
0.12
3.2
7.26
184
355
0.14
3.6
8.17
208
400
0.16
4.0
9.09
231
450
0.18
4.5
10.19
259
500
0.20
5.0
11.32
288
560
0.22
5.6
12.80
325
630
0.25
6.3
14.49
368
Airfoil Aluminum Wheel (Mill Finish)
Unit
Size
Overlap
Overall Assembly
Wheel Back to Inlet Cone
inch
mm
inch
mm
315
0.12
3.2
7.43
189
355
0.14
3.6
8.43
214
400
0.16
4.0
940
239
450
0.18
4.5
10.58
269
500
0.20
5.0
11.71
298
560
0.22
5.6
13.11
333
630
0.25
6.3
14.84
377
Taper-Lock Bushing Installation & Removal
To Install Taper-Lock™ Bushings:
1. Clean shaft, bore and outside of bushing, and bore of hub (taking bushings from hub if
already assembled). Remove any oil, grease and dirt.
2. Place hub onto shaft. Slip bushing onto shaft and into hub. Oil threads and points of
setscrews or threads and under heads of capscrews. DO NOT lubricate the hub bore
or the outside of the bushing. Place screws loosely in holes that are threaded on hub
side (shown as
on diagram above).
3. Locate assembly in desired position and tighten screws slightly to seat bushing in hub.
4. Tighten screws alternately and evenly to the fastener torque. Do not overtorque. Using
a hammer and drift, hammer against large end of bushing. Hammer first beside the screw farthest from the
bushing split and then hammer on the bushing on the opposite side of the screw. Avoid hammering close to the
OD of the bushing to prevent damage.
Working towards the split, hammer on the bushing on each side of the setscrews. Then hammer on each side of
the bushing split. Make sure that the surfaces on both sides of the split are even. Screws can now be tightened
to fastener torque. Repeat sequence, hammering and retightening until the specified fastener torque no longer
turns the screws after hammering.
Wheel Removal / Installation
WARNING
DO NOT use lubricants on the bushing body or hub bore.
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