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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 (
1
/
2
-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 (
1
/
2
-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