IV. Evaporator FAN Performance Adjustment

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

581A			BELT TENSION (lb)
UNIT	VOLTAGE		Fan Type
SIZE
SIZE		Low Vert	High Vert	Low Horz	High Horz
		Low Vert	High Vert	Low Horz	High Horz
	230	4.9	5.1	4.7	5.0
210	460	4.9	5.1	4.7	5.0
	575	3.9	5.2	3.8	4.7
	230	5.1	5.6	5.0	5.5
240	460	5.1	5.6	5.0	5.5
	575	5.1	5.6	5.0	5.5
	230	5.9	4.5	5.9	4.5
300	460	5.9	4.5	5.9	4.5
	575	5.9	4.5	5.9	4.5

LEGEND

Horz — Horizontal

Vert — Vertical

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.

		MOTOR
	FAN	PULLEY
	FAN	(HIDDEN)
	PULLEY	(HIDDEN)
	PULLEY
		MOTOR
		MOUNTING
		BASE
		SLIDE-OUT
		FAN DECK

Fig. 32 — Evaporator-Fan Motor Adjustment

Fig. 33 — Evaporator-Fan Alignment and Adjustment

Fig. 34 — Condenser-Fan Adjustment

—39—

581A specifications

The Bryant 581A is a pivotal model in the realm of heating, ventilation, and air conditioning (HVAC) systems, known for its robust performance and energy efficiency. As part of the Bryant product lineup, the 581A offers a blend of innovative technologies combined with reliable engineering, making it a suitable choice for both residential and light commercial applications.

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