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START-UP
Check List —
Make a walkway inside unit components to
protect insulation. Remove all construction debris from unit
interior. Remove walkway before starting unit.
FILTERS — Install unit filters in all filter sections.
FANS
1. Check lubrication of fan, motor bearings, and linkages.
a. Note that bearings are shipped completely full of
grease for corrosion protection and may run warm
temporarily on start-up until excess grease has
discharged.
b. Hand-operate all linkages, such as damper and
guide vanes, to check for freedom of movement.
2. Check tightness of bearing setscrews or locking collars
(Fig. 35). Also, check tightness of setscrews on fan
wheels and sheaves.
3. Check tightness of fan shaft bearing mounting.
4. Recheck sheave alignment and belt tension. (Refer to
Fig. 14 and 15.)
5. Hand turn fan to make certain fan wheel does not rub in
housing.
Fig. 34 — Fan Discharge Positions, Fans with IGVs
LEGEND
THF — Top Horizontal Front
THR — Top Horizontal Rear
UBF — Upblast Front
UBR — Upblast Rear
SQUEEZE-TYPE LOCKING COLLAR
BEARING SETSCREW TORQUE (in.-lb)
BEARING HOLDDOWN BOLT TORGQUE (ft-lb)
Fig. 35 — Fan Shaft Bearing Details
39L UNIT SIZE TORQUE
03,06,08,10,12 70
15,18,21,25 90
BOLT SIZE TORQUE
3
/
8
-16 30
1
/
2
-13 63
5
/
8
-11 100