Trane Performance Air Handlers Installationshandbuch PDF herunterladen (Seite 80)

80 CAH-SVX01B-EN

Start-Up

Figure 75. Proper drive alignment

Align Fan and Motor Sheaves

Align the fan and motor sheaves using a straightedge. The straightedge

must be long enough to span the distance between the outside edges of

the sheaves. When the sheaves are aligned, the straightedge will touch

both sheaves at points A through D (see Figure 75) to confirm the shaft

is parallel. For uneven width sheaves, place a string in the center groove

of both sheaves and pull tight. Adjust the sheaves and tighten the sheave

set screws to the proper torque given in Ta bl e 4 .

Check Multiple Belts

Tighten the belts slightly and rotate the drive several times.

On multiple belt drives, ensure the force of deflection is approximately the

same on each belt by pushing each belt in an equal distance at a point

halfway from each sheave (see Figure 75). If this force is not the same for

each belt, the motor and fan shaft are not parallel. Realign as required.

After realignment, tighten the belts again to the standard belt tensioning

specifications. If the force is still not the same for all belts, the belts or

sheaves are worn and must be replaced.

Fixed

Sheave

Adjustable

Sheave

Straight

Edge

Lines must

be parallel

Center line

must coincide

Fixed

Sheave

Table 4. Fan and drive compound torque settings (inches)

Screw Size Hex Key Square Head Hex Head Torque (in.-lb.) Torque (ft.-lb.)

1/4 1/8 3/8 7/16 66-90 5.5-7.5

5/16 5/32 1/2 1/2 126-164 10.5-13.7

3/8 3/16 9/16 9/16 228-300 19.0-25.0

7/15 7/32 5/8 5/8 348-450 29.0-37.5

1/2 1/4 3/4 3/4 504-650 42.0-54.2

5/8 5/16 15/16 15/16 1290-1390 107.0-116.0

#10 3/32 - - 28-40 2.3-3.3

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 99 100

Keine Kommentare

Trane Performance Air Handlers Installationshandbuch Seite 80