Daikin RDT-135c Installation And Maintenance Manual

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Daikin RDT-135c Installation And Maintenance Manual Manual pdf 107 page image

IM 738-2 105Check, Test, and Start Procedures: Sheave AlignmentSheave AlignmentMounting:1 Verify both driving and driven sheaves are in alignment andthe shafts are parallel. The center line of the driving sheavemust be in line with the ce1nter line of the driven sheave.See Figure 107.2 Verify that all setscrews are torqued to the values shown inTable 28 on page 115 before starting drive. Check setscrewtorque and belt tension after 24 hours of service.Figure 107. Sheave alignment (adjustable shown)Drive Belt AdjustmentGeneral Rules of Tensioning1 The ideal tension is the lowest tension at which the belt willnot slip under peak load conditions.2 Check tension frequently during the first 24–3 48 hours of operation.4 Over tensioning shortens belt and bearing life.5 Keep belts free from foreign material which may causeslippage.6 Make V-drive inspection on a periodic basis. Adjust tensionif the belt is slipping. Do not apply belt dressing. This maydamage the belt and cause early failure.Tension Measurement Procedure1 Measure the belt span. See Figure 108.2 Place belt tension checker squarely on one belt at the centerof the belt span. Apply force to the checker, perpendicularto the belt span, until the belt deflection equals belt spandistance divided by 64. Determine force applied while inthis position.3 Compare this force to the values on the drive kit labelfound on the fan housing.Figure 108. Drive belt adjustmententerlinesmustcoincideMustbeparallelMustbeparallelAdjustableSheaveMotorBearingBeltSpanDeflection=BeltSpan64