Bryant DURAPAC PLUS 581A User Manual download pdf (Page 39)

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IV. EVAPORATOR FAN PERFORMANCE ADJUSTMENT

(Fig. 32 and 33)

Fan motor pulleys are factory set for speed shown in Table 1.

To change fan speeds:

1. Shut off unit power supply.

2. Loosen nuts on the 4 carriage bolts in the mounting

base. Using adjusting bolts and plate, slide motor and

remove belt.

3. Loosen movable-pulley flange setscrew (see Fig. 33).

4. Screw movable flange toward fixed flange to increase

speed and away from fixed flange to decrease speed.

Increasing fan speed increases load on motor. Do not

exceed maximum speed specified in Table 1.

See Table 24 for air quantity limits.

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.)

6. Replace and tighten belts (see Belt Tension Adjust-

ment section below).

7. Restore power to unit.

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.

V. BELT TENSION ADJUSTMENT

To adjust belt tension:

1. Turn off unit power.

2. Slide out fan deck to service position as shown in Evap-

orator Fan Service and Replacement section above.

3. Loosen fan motor bolts.

4. Move motor mounting plate to adjust to proper belt

tension. See Table 30. Motor adjuster bolts may be

used to tighten belts. See Fig. 32.

5. Check for proper belt alignment. Adjust if necessary.

6. Tighten motor mounting plate bolts to lock motor in

proper position.

7. Return fan deck back into operating position.

8. Restore power to unit.

Table 30 — Belt Tension Adjustment

LEGEND

VI. CONDENSER-FAN ADJUSTMENT (Fig. 34)

1. Shut off unit power supply.

2. Remove condenser-fan assembly (grille, motor, motor

cover, and fan) and loosen fan hub setscrews.

3. Adjust fan height as shown in Fig. 34.

4. Tighten setscrews and replace condenser-fan assembly.

5. Turn on power to unit.

581A

UNIT

SIZE

VOLTAGE

BELT TENSION (lb)

Fan Type

Low Vert High Vert Low Horz High Horz

210

230 4.9 5.1 4.7 5.0

460 4.9 5.1 4.7 5.0

575 3.9 5.2 3.8 4.7

240

230 5.1 5.6 5.0 5.5

460 5.1 5.6 5.0 5.5

575 5.1 5.6 5.0 5.5

300

230 5.9 4.5 5.9 4.5

460 5.9 4.5 5.9 4.5

575 5.9 4.5 5.9 4.5

Horz — Horizontal

Vert — Ver tical

Fig. 32 — Evaporator-Fan Motor Adjustment

Fig. 33 — Evaporator-Fan Alignment and Adjustment

FAN

PULLEY

MOTOR

MOUNTING

BASE

MOTOR

PULLEY

(HIDDEN)

SLIDE-OUT

FAN DECK

Fig. 34 — Condenser-Fan Adjustment

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 55 56

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Bryant DURAPAC PLUS 581A User Manual Page 39

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