Radial Gap, Overlap And Wheel Alignment - Greenheck APD Installation, Operation And Maintenance Manual

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.
Inlet Cone to Backplate
Unit
Size
A Dimension*
± Tolerance (in.)
± 1/8
7 1 3 ⁄
16
± 1/8
8 2 3 ⁄
16
± 1/8
9 3 3 ⁄
16
± 1/8
10 3 7 ⁄
16
± 1/8
12 4
± 1/8
13 4 7 ⁄
16
± 1/8
15 5
± 1/8
16 5 7 ⁄
16
± 1/8
18 6 3 ⁄
8
± 3/16
20 7
± 3/16
22 7 ⁄
13
16
± 1/4
24 8 ⁄
5
8
± 1/4
27 9 7 ⁄
16
± 3/8
30 10 9 ⁄
16
± 3/8
33 11 7 ⁄
16
± 3/8
36 12 3 ⁄
4
± 3/8
40 14 3 ⁄
16
± 3/8
44 15 9 ⁄
16
± 1/2
49 17 1 ⁄
8
± 1/2
54 18 13 ⁄
16
± 1/2
60 20 15 ⁄
16
± 1/2
66 22 7 ⁄
8
± 1/2
73 25 1 ⁄
2
*A dimension does not apply to partial width wheels.
PLG
A Dimension*
± Tolerance (mm) ± Tolerance (in.)
± 3
30
± 3
36
± 3
81
± 3
87
± 3
102 1/8
± 3
113
± 3
127 1/8
± 3
138 3/16
± 3
162 3/16
± 5
178 1/4
± 5
198 1/4
± 6
219 5/16
± 6
240 3/8
± 10
268 3/8
± 10
291 7/16
± 10
324 7/16
± 10
360 1/2
± 10
395 9/16
± 13
435 5/8
± 13
478 5/8
± 13
532 3/4
± 13
581 7/8
± 13
648 1
APM, APH
Wheel Cone to Inlet Cone
Offset Offset
± Tolerance (mm)
± 1/16 ± 1.5
3
± 1/16 ± 1.5
3
± 1/16 ± 1.5
5
± 1/16 ± 1.5
5
± 1/16 ± 1.5
6
± 1/16 ± 1.5
6
± 1/16 ± 1.5
8
± 1/16 ± 1.5
9.5
± 1/16 ± 1.5
9.5
± 1/16 ± 1.5
11
± 1/8 ± 3
11
± 1/8 ± 3
13
± 1/8 ± 3
14
± 1/8 ± 3
16
± 1/8 ± 3
16
± 1/8 ± 3
19
± 1/8 ± 3
22
± 1/8 ± 3
25
Housed Plenum Array, Plug and Plenum
HPA
Wheel Cone to Inlet Cone
Offset Offset
± Tolerance (in.) ± Tolerance (mm)
± 1/16
7/16 11
± 1/16
7/16 11
± 1/16
7/16 11
± 1/16
7/16 11
± 1/16
7/16 11
± 1/16
7/16 11
± 1/16
7/16 11
± 1/8
9/16 14
± 1/8
9/16 14
± 1/8
9/16 14
± 1/8
9/16 14
± 1.5
± 1.5
± 1.5
± 1.5
± 1.5
± 1.5
± 1.5
± 1.5
± 1.5
± 1.5
± 3
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