McQuay Skyline IM 777-6, Installation And Maintenance Manual, Page: 20 / 38

20 McQuay IM 777-6
Operation Guidelines
Figure 31: Wheel-to-Inlet Funnel Relationship—40 to 60
Plenum Fans
Table 6: Wheel-to-Inlet Funnel Relationship—40 to 60
Plenum Fan
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 7: Setscrew Torque Specifications—Belt Drive
Plenum Fans Only
Figure 32: Wheel-to-Inlet Funnel Relationship—Inline Fans
Table 8: Wheel-to-Inlet Funnel Relationship—Inline Fans
Table 9: Bearing Collar and Wheel Hub Set Screw Torque
(All Fans Except Belt Drive Plenum Fans)
Wheel-Funnel Parameters
Size A B C
40 0.82 2.00 4.88
44 0.91 2.25 5.50
49 1.00 2.50 5.50
54 1.10 2.50 5.50
60 1.23 3.00 5.50
Fan Size Setscrew Size
Torque (ft.-lb)
Aluminum Steel
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
Cross Section Reference
B
C
A
FUNNEL END TO FAN
WHEEL OPENING
EQUALLY
SPACED AROUND
DIAMETER
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
150 .375
165 .438
182 .562
200 .625
222 .688
245 .750
270 .812
300 .875
330 1.000
365 1.125
402 1.250
445 1.375
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
Overlap