Carrier 50BA - Manual (Page 10)

Step 8 — Align fan shaft and wheel.
HORIZONTAL WHEEL CENTERING — All
wheels must be horizontally centered between the
inside edges of their fan scroll venturis (Eig. 11).
WHEEL
VENTURI
/SCROLL
MUST BE EQUAL ALL AROUND
Fig. 11 — Horizontal Wheel Centering
Adjust as follows:
Unit Sizes 50BA,BBQ04 thru 024
1. Loosen setscrews holding wheel support to shaft
(Eig. 12).
2. Center the wheel by sliding it horizontally.
3. Retighten setscrews.
Unit Sizes 50BA'BBQ28 thru 064
1. Loosen fan wheel locking clamps on each side
of fan support (Fig. 12).
2. Center the wheel by sliding it horizontally.
3. Retighten locking clamp bolts to torque speci­
fied in Table 3.
Table 3 — Torque Requirements
BOLT SIZE (in.)
FAN CLAMP BOLT
RECOMMENDED TORQUE (Ib-ft)
5/16
7/16 15-18
30-35
CONCENTRIC ALIGNMENT Shaft and
wheels must be concentrically centered with the
venturi or air inlet of the fan housing (Fig. 13).
Unit Sizes 50BA,BB004 thru 024 — Shaft bearings
are supported by spider (Fig. 14). If shaft and wheels
are concentrically misaligned from shipping shock,
it is possible to rebend spider arms to original posi­
tions. Replace the spider if it has been extensively
damaged by shipping shock.
VENTURI
LOCKING COLLAR
SHAFT
Fig. 14 — Fan Shaft Bearings — 004,006,
008,012,016,024
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