Fan Drive Belt Adjustment - Daikin Destiny VFD Series Installation And Maintenance Manual

Fan Drive Belt Adjustment

Moving belt and fan can cause severe personal injury or
death .
During installation and filter maintenance:
• Lock and tag out fans to prevent accidental start up.
• Do not enter the filter compartment until the fan is completely stopped.
• Use approved equipment for reaching filters located above normal reach.
Do not step on filter frames or unit components.
• Floor surfaces must be dry and free of oil or grease.
Figure 52: Sheave/Belt Alignment
Must be
parallel
Bearing
Motor
Must be
parallel
IM 782-12 • DESTINY AIR HANDLERS
WARNING
Center lines
must coincide
Adjustable
sheave
General Rules of Tensioning
1. The ideal tension is the lowest tension at which the belt
does not slip under peak load conditions.
2. Check tension frequently during the first 24 to 48 hours
of operation.
3. Over tensioning shortens belt and bearing life.
4. Keep belts free from foreign material, which may cause
slippage.
5. Make V-drive inspection 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
1. Measure the belt span. See
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 in
4. Adjust to the minimum value. If the belts slip, add tension.
Figure 53: Drive Belt Adjustment
50
Service and Maintenance
Figure 53.
Table 38.
Belt span
Deflection =
64
www.DaikinApplied.com