Trane RT-SVX10C-EN specifications Hazardous Voltage, Fan Belt Adjustment

Fan Belt Adjustment

The supply fan belts and optional exhaust fan belts must be inspected periodically to assure proper unit operation.

Replacement is necessary if the belts appear frayed or worn. Units with dual belts require a matched set of belts to ensure equal belt length.

When removing or installing the new belts, do not stretch them over the sheaves. Loosen the belts using the belt ten- sion adjustment bolts on the motor mounting base.

Once the new belts are installed, using a Browning or Gates tension gauge (or equivalent) illustrated below; ad- just the belt tension as follows;

Service & Maintenance (Continued)

WARNING

Hazardous Voltage!

Disconnect all electric power, including remote discon- nects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvert- ently energized. Failure to disconnect power before ser- vicing could result in death or serious injury.

1.To determine the appropriate belt deflection;

a.Measure the center-to-center shaft distance (in inches) between the fan and motor sheaves.

b.Divide the distance measured in Step 1a by 64; the resulting value represents the amount of belt deflection that corresponds to the proper belt tension.

2.Set the large O-ring on the belt tension gauge at the de- flection value determined in Step 1b.

3.Set the small O-ring at zero on the force scale of the gauge plunger.

4.Place the large end of the gauge at the center of the belt span; then depress the gauge plunger until the large O- ring is even with the top of the next belt—-or even with a

straightedge placed across the fan and motor sheaves. Refer to Figure 5-1

.

5.Remove the belt tension gauge. The small O-ring now in- dicates a number other than zero on the plunger’s force scale. This number represents the force (in pounds) re- quired to give the needed deflection.

6.Compare the "force" scale reading (Step 5) with the ap- propriate “force” value listed in Figure 5-1. If the "force" reading is outside the range, readjust the belt tension.

Note: Actual belt deflection "force" must not exceed the maximum “force” value shown in Figure 5-1.

7.Recheck the belt tension at least twice during the first 2 to 3 days of operation. Belt tension will decrease rapidly until the new belts are “run in”.

104