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www.DaikinApplied.com 107
IM 893-10 • ROOFPAK SINGLEZONE UNITS
Drive Belt Alignments
Sheave Alignment
Mounting:
1. Verify both driving and driven sheaves are in alignment
and the shafts are parallel. The center line of the driving
sheave must be in line with the center line of the driven
2. Verify that all setscrews are torqued to the values shown
in
before starting drive. Check
setscrew torque and belt tension after 24 hours of
service.
Figure 109: Sheave Alignment (Adjustable Shown)
Drive Belt Adjustment
General Rules of Tensioning
1. The ideal tension is the lowest tension at which the belt
will not slip under peak load conditions.
2. Check tension frequently during the first 24 – 48 hours of
operation.
3. Over tensioning shortens belt and bearing life.
4. Keep belts free from foreign material which may cause
slippage.
5. Inspect V-belts on a periodic basis. Adjust tension if the
belt is slipping. Do not apply belt dressing. This may
damage the belt and cause early failure.
Tension Measurement Procedure
2. Place belt tension checker squarely on one belt at
the center of the belt span. Apply force to the checker,
perpendicular to the belt span, until the belt deflection
equals belt span distance divided by 64. Determine force
applied while in this position.
3. Compare this force to the values on the drive kit label
found on the fan housing.
Figure 110: Drive Belt Adjustment
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