Carrier 50BA User Manual

Page 10

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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