Operating and Maintenance Manual

Belt Tensioning Instructions

Tensioning Forces

Belt Section	Force required to deflect belt 16mm per metre of span
	Small Pulley Diameter	Kilogram Force
SPZ	56-95 mm	1.3-2.0 kg
SPZ	100-140 mm	2.0-2.5 kg
SPA	80-132 mm	2.5-3.6 kg
SPA	140-200 mm	3.6-4.6 kg
SPB	112-224 mm	4.6-6.6 kg
SPB	236-315 mm	6.6-8.7 kg
SPC	224-355 mm	8.7-11.7 kg
SPC	375-560 mm	11.7-15.3 kg

Belt Tensioning Procedure Using A Belt Tension Indicator

Calculate the deflection distance in mm on a basis of 16mm per metre of centre distance.
Set the lower marker ring at the deflection distance required in mm on the lower scale.
Set the upper marker ring against the bottom edge of the tube.
Place the belt tension indicator on top of the belt at the centre of the span, and apply a force at the right angles to the belt deflecting it to the point where the lower marker ring is level with the top of the adjacent belt.
Read off the force value indicated by the top edge of the marker ring.
Compare this force to the kgf value in the table above.
If a Belt Tension Indicator is not available, a spring balance and rule will suffice.

IMPORTANT
After the drive has been running for approximately 30 minutes, the tension should be checked and readjusted to the higher value, if necessary.

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Introductory video

Air Handlers Northern
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