McQuay Skyline OAC 003G Installation And Maintenance Manual page 22

Operation Guidelines
Setscrews on MPQ fan wheels must be installed using a
calibrated torque wrench to the value listed below, ±5%.The
fasteners must be periodically checked to satisfy agency
requirements for components on rotating machinery.
Table 10: Setscrew Torque Specifications—Class II Plenum
Fans Only
Fan Size Setscrew Size
11/12/13 3/8
15 3/8
16 3/8
18 3/8
20 3/8
22 3/8
24 3/8
27 3/8
30 1/2
33 1/2
36 1/2
40 1/2
44 1/2
49 1/2
54 1/2
60 3/4
Figure 34: Wheel-to-Inlet Funnel Relationship—Inline Fans
Table 11: Wheel-to-Inlet Funnel Relationship—Inline Fans
Wheel—funnel overlap
Size
150
165
182
200
222
245
270
300
330
365
402
445
22
Torque (ft.-lb)
Aluminum Steel
19.2 N/A
19.2 N/A
19.2 N/A
19.2 N/A
19.2 N/A
19.2 N/A
19.2 N/A
19.2 22
41.7 55
41.7 55
41.7 55
41.7 55
41.7 55
41.7 55
41.7 55
115 150
Overlap
Overlap (in.)
0.375
0.438
0.562
0.625
0.688
0.750
0.812
0.875
1.000
1.125
1.250
1.375
Table 12: Wheel to Inlet Funnel Relationship - Direct Drive
Class II fans
Fan Size Overlap (in.)
11
12
15
16
18
20
22
24
27
30
33
36
40
44
Table 13: Wheel to Inlet Funnel Relationship - Direct Drive
Class III fans
Fan Size Overlap (in.)
13
15
16
18
20
22
24
27
30
33
36
40
44
49
54
60
Table 14: Bearing Collar and Wheel Hub Set Screw Torque
(All Fans Except Class II Plenum Fans)
Set screw
Diameter (in)
1/4
1/16
3/8
7/16
1/2
5/8
0.25
0.25
0.25
0.38
0.38
0.41
0.45
0.50
0.55
0.61
0.67
0.75
0.82
0.91
0.12
0.19
0.25
0.31
0.38
0.44
0.50
0.56
0.62
0.75
0.81
0.88
0.94
1.0
1.06
1.12
Minimum torque
ft/lbs kg/m.
5.5 .76
10.5 1.45
19.0 2.63
29.0 4.01
42.0 5.81
92.0 12.72
McQuay IM 777-7