Bryant 548D User Manual

Page 20

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5. Set movable flange at nearest keyway of pulley hub

and tighten setscrew. (See Table 1 for speed change
for each full turn of pulley flange).

To align fan and motor pulleys:

1. Loosen fan pulley setscrews.

2. Slide fan pulley along fan shaft.

3. Make angular alignment by loosening motor from

mounting plate.

To adjust belt tension:

1. Loosen fan motor mounting plate nuts.
2. Units 090,102 — Slide motor mounting plate away

from fan scroll for proper belt tension (

-in.

deflection with 5 to 10 lbs of force) and tighten
mounting nuts with 10 lbs torque (see Fig. 36).
Unit 120 — Slide motor mounting plate downward to
tighten belt tension (

-in. deflection with 5 to 10 lbs

of force). Secure motor mounting plate nuts with
10 lbs of torque. See Fig. 37.

3. Adjust bolt and nut on mounting plate to secure

motor in fixed position.

Realign fan and motor pulleys:

1. Loosen fan pulley setscrews.
2. Slide fan pulley along fan shaft.
3. Make angular alignment by loosening motor from

mounting plate.

MOTOR MOUNTING

PLATE NUTS

Fig. 36 — Typical Belt-Drive Motor

Mounting for Sizes 090 and 102

Fig. 37 — Typical Belt-Drive Motor

Mounting for Size 120

Fig. 38 — Indoor-Fan Pulley Adjustment