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4
JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
Belt Tensioning:
Belt tension information is included on the fan skid data
plate as shown in Figure. 4-2. Sample data plate shows
4.3 lbs pressure at .30 inches defl ection.
A Browning Belt tension gauge is used in Figure. 4-3
to prop er ly tension belts.
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FIG. 4-2 – FAN DATA PLATE - BELT TENSION
FIG. 4-3 – BELT TENSIONING GAUGE
LD06354
An incorrectly aligned and tensioned belt can
sub stan tial ly shorten belt life or overload blow er and
motor bear ings, shortening their life ex pect an cy. A belt
tensioned too tightly can over load the motor electrical,
causing nui sance trip ping of the motor overloads and/or
motor fail ure and/or shaft fail ure.
Belt Replacement
Always replace belts as a set. Follow the steps below
to replace belts:
1. Release the tension on the belts by loos en ing the
ad just ing nuts on the fan motor.
2. Remove old belts and recheck the sheave align ment
with a straight edge.
3. Install the new belts on the sheaves.
Never place the belts on the sheaves by using a
screw driv er to pry the belt over the rim of the sheave.
This will permanently damage the belts.