Attic Fan Belt Deflection

Dispose of the broken fan belt or pieces of the belt in the trash. The correct tension method is to get the belt close to the correct tension by feel with a deflection of 1 64 of an inch for every 1 of distance between the two pulley centers. Adjust the motor back until there is approximately 1 2 1 3 cm to 3 4 1 9 cm deflection at the center of the belt with light pressure.

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For example if the span length is 32 inches the desired belt deflection is inch.

Attic fan belt deflection.

Pull the other end of the belt off the other hub inside the fan. Pull one end of the old fan belt off from around the hub connected to the motor shaft. A space between the belts should be about 1 3 4 at proper belt tension. The force f to apply is shown per belt in the table to the left.

Set the large o ring on the tensiometer to the desired deflection determined in step 2. Conversely an improperly tensioned belt can cause a host of easily preventable problems including noise vibration poor fan performance bearing wear and shortened fan motor life. Set the small o ring on the tensiometer to the zero mark. You can then use an app or a chart like this one to find the proper force to generate this deflection.

A properly tensioned belt ensures smooth operation and extends the service life of fans and motors. So for a 32 span the deflection amount would be 32 64 or 1 2. Slowly rotate blade one full revolution by hand to. Test belt tension with power off squeeze belt together with light force.

Lift the belt out of the fan if the fan belt is broken in half pull the two sections off the hubs and lift them out of the fan. The force shown in the table is per rib. So for a 5 rib belt you will need to multiply the force shown in the. Desired belt deflection is 1 64 of an inch for every inch of belt span.

To deflect the belt 1 64 for each 1 of belt span q.