Operation Guidelines
www.DaikinApplied.com 27
IM 915-13 • VISION - EXTENDED SIZES
Figure 43: Fan Wheel Rotation
Table 9: Wheel to Inlet Funnel Relationship—
Direct-Drive Class II Fans
Fan Size
Overlap (in .)
18
0.38
20
0.41
22
0.45
24
0.50
27
0.55
30
0.61
33
0.67
36
0.75
40
0.82
44
0.91
Table 10: Wheel to Inlet Funnel Relationship—
Direct Drive Class III Fans
Fan Size
Overlap (in .)
18
0.31
20
0.38
22
0.44
24
0.50
27
0.55
30
0.62
33
0.75
36
0.81
40
0.88
44
0.94
49
1.0
54
1.06
60
1.12
Table 11:
Setscrew Torque Specifications—
Class II Plenum Fans Only
Fan Size
Setscrew Size
Torque (ft .-lb)
Aluminum
Steel
18
3/8
19.2
N/A
20
3/8
19.2
N/A
22
3/8
19.2
N/A
24
3/8
19.2
N/A
27
3/8
19.2
22
30
1/2
41.7
55
33
1/2
41.7
55
36
1/2
41.7
55
40
1/2
41.7
55
44
1/2
41.7
55
49
1/2
41.7
55
54
1/2
41.7
55
60
3/4
115
150
Table 12: Bearing Collar and Wheel Hub Set Screw Torque
(all fans except Class II plenum fans)
Set Screw Diameter
(in)
Minimum torque
ft/lbs (kg/m)
1/16
5.5 (0.76)
1/4
10.5 (1.45)
3/8
19.0 (2.63)
7/16
29.0 (4.01)
1/2
42.0 (5.81)
5/8
92.0 (12.72)
Содержание Vision
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