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Fan Drive Belt Adjustment
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 that can cause
slippage.
5. Inspect V-drive on a periodic basis. Adjust tension if
the belt is slipping. Do not apply belt dressing. This can
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 the
force applied while in this position.
3. Compare this force to the values in
Figure 66: Drive Belt Adjustment
Deflection =
www.DaikinApplied.com
Figure
66.
Table
26.
Belt span
64
Table 26: Belt Deflection Force (per Browning
Specifications)
Cross
Small sheave
section
diameter (in)
0.0 to 3.5
A, AX
3.6 to 4.4
4.5 +
0.0 to 5.4
B, BX
5.5 to 7.6
7.7 +
0.0 to 8.5
5V, 5VX
0.6 to 12.0
12.1 +
Front Load Filter Option
Front loaded filter options require that the filters be removed
and replaced from inside the unit.
To remove filters, rotate the wire clips. This releases both the
prefilter and the final filter. When installing clean filters, check
to verify the filters are fully seated in the frame. See
Figure 67: Frame and Filters with Holding Clips
P r e f i l t e r
43
Service and Maintenance
Number of belts (deflection force lbs)
1
2
min
max
min
max
3.0
5.0
2.5
4.0
3.5
5.0
3.0
4.5
4.0
5.5
3.0
5.0
5.5
8.0
4.5
7.0
5.5
8.5
4.5
7.5
6.5
9.0
5.0
8.0
7.0
11.0
5.5
9.0
8.5
13.0
6.5
10.5
10.0
15.0
7.5
11.5
R o t a t e
W i r e C l i p s
IM 915-13 • VISION - EXTENDED SIZES
3 +
min
max
2.0
3.5
2.0
4.0
2.5
4.5
3.5
5.5
3.5
5.5
4.0
6.5
4.0
7.0
5.0
8.0
5.5
9.0
Figure
67.
F i n a l
F i l t e r
F i l t e r
F r a m e
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