22
McQuay IM 777-7
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
Figure 34: Wheel-to-Inlet Funnel Relationship—Inline Fans
Table 11: Wheel-to-Inlet Funnel Relationship—Inline Fans
Table 12: Wheel to Inlet Funnel Relationship - Direct Drive
Class II fans
Table 13: Wheel to Inlet Funnel Relationship - Direct Drive
Class III fans
Table 14: Bearing Collar and Wheel Hub Set Screw Torque
(All Fans Except Class II Plenum Fans)
Fan Size
Setscrew Size
Torque (ft.-lb)
Aluminum
Steel
11/12/13
3/8
19.2
N/A
15
3/8
19.2
N/A
16
3/8
19.2
N/A
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
Wheel—funnel overlap
Size
Overlap (in.)
150
0.375
165
0.438
182
0.562
200
0.625
222
0.688
245
0.750
270
0.812
300
0.875
330
1.000
365
1.125
402
1.250
445
1.375
Overlap
Fan Size
Overlap (in.)
11
0.25
12
0.25
15
0.25
16
0.38
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
Fan Size
Overlap (in.)
13
0.12
15
0.19
16
0.25
18
0.31
20
0.38
22
0.44
24
0.50
27
0.56
30
0.62
33
0.75
36
0.81
40
0.88
44
0.94
49
1.0
54
1.06
60
1.12
Set screw
Minimum torque
Diameter (in)
ft/lbs
kg/m.
1/4
5.5
.76
1/16
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