6
Model BCSW-FRP
Radial Gap, Overlap and Wheel Alignment
Efficient fan performance can be maintained by having the correct radial gap, overlap and wheel alignment.
These items should be checked after the fan has been in operation for 24 hours and before start-up after the
unit has been serviced.
Radial Gap
is adjusted by loosening the housing bolts
and centering the inlet cone on the wheel. If additional
adjustment is required to maintain a constant radial
gap, loosening the bearing bolts and centering the
wheel is acceptable as a secondary option.
Overlap
is adjusted by loosening the wheel hub from
the shaft and moving the wheel to the desired position
along the 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.
Inlet Cone
Wheel
Unit
Size
A Dimension
Radial Gap
Overlap (maximum)
± Tolerance
(in.)
± Tolerance
(mm)
± Tolerance
(in.)
± Tolerance
(mm)
± Tolerance
(in.)
± Tolerance
(mm)
6
3
± 1/8
76
± 3
1
⁄
8
± 1/32
3
± 1
3
⁄
8
± 1/16
10
± 2
8
4
± 1/8
102
± 3
1
⁄
8
± 1/32
3
± 1
7
⁄
16
± 1/16
11
± 2
10
5
± 1/8
127
± 3
1
⁄
8
± 1/32
3
± 1
7
⁄
16
± 1/16
11
± 2
15
5
7
⁄
16
± 1/8
138
± 3
1
⁄
8
± 1/32
3
± 1
3
⁄
4
± 1/16
19
± 2
18
7
1
⁄
8
± 1/8
181
± 3
1
⁄
8
± 1/32
3
± 1
1
1
⁄
8
± 1/16
29
± 2
22
7
15
⁄
16
± 1/8
202
± 5
3
⁄
16
± 1/32
5
± 1
1
1
⁄
4
± 1/16
32
± 2
25
9
1
⁄
8
± 1/8
232
± 6
3
⁄
16
± 1/32
5
± 1
7
⁄
8
± 1/16
22
± 2
30
11
1
⁄
8
± 1/8
283
± 10
3
⁄
16
± 1/32
5
± 1
1
± 1/16
25
± 2
36
13
1
⁄
4
± 1/8
337
± 10
3
⁄
16
± 1/16
5
± 2
1
1
⁄
4
± 1/16
32
± 2
44
15
1
⁄
2
± 1/8
394
± 10
3
⁄
16
± 1/16
5
± 2
1
3
⁄
4
± 1/16
44
± 2
48
17
1
⁄
8
± 1/8
435
± 13
3
⁄
16
± 1/16
5
± 2
1
1
⁄
2
± 1/16
38
± 2
54
19
3
⁄
16
± 1/8
487
± 13
3
⁄
16
± 1/16
5
± 2
1
7
⁄
16
± 1/16
37
± 2
60
21
± 1/8
533
± 13
7
⁄
32
± 1/16
6
± 2
3
⁄
4
± 1/16
19
± 2
73
25
3
⁄
4
± 1/8
654
± 13
1
⁄
4
± 1/16
6
± 2
1
1
⁄
4
± 1/16
32
± 2
Inlet Cone
Overlap
Impeller Wheel
A
Radial
Gap
Inlet Cone
Impeller Wheel
A
Overlap
Radial
Gap
BCSW-FRP
Sizes 15 thru 73
BCSW-FRP
Sizes 6 thru 10
