Trane Custom Climate Changer Air Handlers Startup Tension the Fan Belt, Tension Belts Correctly

Startup

Tension the Fan Belt

Check the fan belt tension at least three times during the first days of operation because there is a rapid decrease in tension until the belt settles in (see Figure 46 and Figure 47).

￿WARNING Hazardous Voltage with Capacitors!

Disconnect all electric power, including remote disconnects and discharge all motor start/run capacitors before servicing. Follow proper lockout/tagout procedures to ensure the power cannot be inadvertently energized. For variable frequency drives or other energy storing components provided by Trane or others, refer to the appropriate manufacturer’s literature for allowable waiting periods for discharge of capacitors. Verify with an appropriate voltmeter that all capacitors have discharged. Failure to disconnect power and discharge capacitors before servicing could result in death or serious injury.

CAUTION

Tension Belts Correctly!

Over-tensioning belts can cause damage to bearings, shafts, and drive components. Under tensioning belts is the primary cause of premature belt failure. Belts should not squeal at startup. Recheck belt tension after 8 hours, 24 hours, and 100 hours of operation and monthly thereafter.

Proper belt tension is required to

ensure maximum bearing and drive Figure 47. Belt tensioner component life and is based on

motor horsepower requirement. A label located on the bearing support on the drive side of the unit lists all drive parts, the proper belt tension, and deflection for that tension for the specific drive.

If the drive is changed from the original, proper belt tension can be estimated using Table 3.

The correct operation tension for a V-belt drive is the lowest tension at which the belts will not slip under the peak load conditions. It may be necessary, however, to increase the tension of some drives to reduce excessive belt flopping or to reduce excessive startup squealing.

Figure 46. Belt tension measurement

CAH-SVX01A-EN 45