Acer 471558 Bedienungsanleitung PDF herunterladen (Seite 6)

Model G/GB Centrifugal Roof Exhaust Fans

WARNING

Correct direction of wheel rotation is critical. Reversed

rotation will result in poor air performance, motor

overloading and possible burnout.

WARNING

The fan has been checked for mechanical noises at the

factory prior to shipment. If mechanical noise should

develop, suggested corrective actions are offered in

the Troubleshooting section.

IMPORTANT

Over tightening will cause excessive bearing wear and

noise. Too little tension will cause slippage at startup

and uneven wear.

Model GB

Pre-Starting Belt Tension Checks

8. Always loosen tension enough to install belts without

stretching, see Figure 9.

9. For units with two groove pulleys, adjust so the

tension is equal in both belts.

10. If adjustments are made, it is very important to check

the pulleys for proper alignment. Misaligned pulleys

lead to excessive belt wear vibration, noise and

power loss, see Figure 10.

Figure 10

Wheel Overlap and Gap Dimensions

Figure 7

Model G - Overlap in. (mm) H - Gap in. (mm)

G 060-095 –

⁄32 (2)

G 97-163

⁄4 (6) –

GB 071-161

⁄4 (6) –

G 183-243

⁄8 (10) –

GB 180-240

⁄8 (10) –

GB 260-540

⁄2 (13) –

Pre-Starting Checks

1. Check all fasteners and set screws for tightness. The

wheel should rotate freely and be aligned as shown

in Figure 7 below.

2. Wheel position is preset and the unit is test run at the

factory. Movement may occur during shipment and

realignment may be necessary.

3. Only G unit - Centering height alignment can be

accomplished by loosening the set screws in the

wheel and moving the wheel to the desired position.

4. Only GB unit - Centering can be accomplished by

loosening the bolts holding the drive frame to the

shock mounts and repositioning the drive frame.

5. Only GB unit - Wheel and inlet cone overlap can be

adjusted by loosening the set screws in the wheel

and moving the wheel to the desired position.

6. Only GB unit - Fan RPM should be checked and

veriﬁed with a tachometer.

7. Check wheel rotation (viewing from the shaft side)

by momentarily energizing the unit. Rotation should

be clockwise as shown in Figure 8 and correspond

to rotation decal on the unit. If wheel rotation is

incorrect, reverse two of the wiring leads or check

motor wiring for single phase.

Wheel Rotation

Clockwise

Airﬂow

Counterclockwise

Airﬂow

Figure 8

Clockwise

Rotation

All Models

Do not force belt(s). Forcing the

belt(s) will break the cords and

cause belt failure

Belts

Figure 9

1 2 3 4 5 6 7 8 9 10 11 12

Kommentare zu diesen Handbüchern

Keine Kommentare

Acer 471558 Bedienungsanleitung Seite 6

Kommentare zu diesen Handbüchern