McQuay IM 937 47
System Maintenance
BOA concentric inserts
1 Be sure that BOA Concentric collar is fitted square and
snug against the shoulder on the inner ring.
2 Torque BOA Concentric collar cap screw to torque
recommended in Table 21.
Note: AF = DWDI AF, SWSI = AF Plenum Fan
Monitor installed bearing
After bearing has been run for several minutes, and again after
several hours, check bearing for excessive noise or vibration.
Shutdown machine and check housing temperature: typical
applications operate at 100°F - 105°F (38°C - 66°C). Tighten
all locking devices after 500 hours or 3 months, whichever
comes first.
Table 21: Recommended Torque Values for Concentric
Locking Bearing/Shaft Size
Fan Size (in) Bore Size (in)
Torx Screw
Size
In lbs.
27 (AF)/40 & 49
(SWSI)
2-3/16 T-30 180
30 & 33 (AF)/44
(SWSI)
2-7/16 T-45 400
36 (AF) 2-11/16 T-45 400
40 (AF) 2-15/16 T-45 400
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