Carrier 48TF004-007 specifications Adjust Evaporator-FanSpeed - Ad, Direct Drive Motor Mounting

Step 9 — Adjust Evaporator-Fan Speed — Ad-

just evaporator-fan rpm to meet jobsite conditions. Table 5 shows fan rpm at motor pulley settings. Table 6 shows motor performance. See Table 7 for Accessory/FIOP Static Pressure. Refer to Tables 8-29 to determine fan speed settings.

DIRECT-DRIVE MOTORS — The evaporator-fan motor factory speed setting is shown on label diagram affixed to base unit. If other than factory setting is desired, refer to label diagram for motor reconnection. See Fig. 39 for direct drive motor location.

BELT-DRIVE MOTORS — Fan motor pulleys are factory set for speed shown in table 1. See Fig. 40 for belt drive motor location.

NOTE: Before adjusting fan speed, make sure the new fan speed will provide an air temperature rise range as shown in Table 1.

To change fan speed:

1.Shut off unit power supply.

2.Loosen belt by loosening fan motor mounting nuts. See Fig. 40.

3.Loosen movable pulley flange setscrew (see Fig. 41).

4.Screw movable flange toward fixed flange to increase speed and away from fixed flange to decrease speed. In- creasing fan speed increases load on motor. Do not ex- ceed maximum speed specified in Table 1.

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.)

Fig. 39 — Direct Drive Motor Mounting

To align fan and motor pulleys:

1.Loosen fan pulley setscrews.

2.Slide fan pulley along fan shaft.

Make angular alignment by loosening motor from mounting.

To adjust belt tension:

1.Loosen fan motor mounting nuts.

2.Slide motor mounting plate away from fan scroll for proper belt tension (1/2-in. deflection with one finger).

3.Tighten motor mounting nuts.

4.Adjust bolt and tighten nut to secure motor in fixed position.

MOTOR MOUNTING

PLATE NUTS

Fig. 40 — Belt Drive Motor Mounting

Fig. 41 — Evaporator-Fan Pulley Adjustment

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