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2.6.3
Setting Belt Tension
Follow the procedures outlined below to correctly set and measure belt tension on electric motor and engine driven models including 2475
and 2545 (with "A" belt type only). Refer to the following illustration for a visual representation.
1. Lay a straight edge across the top outer surface of the belt drive from pulley to sheave.
2. At the center of the span, perpendicular to the belt, apply pressure to the outer surface of the belt with a tension gauge. Force the belt
to the deflection indicated in the BELT TENSION TABLE in the DIAGRAMS & TABLES section. Compare the reading on the tension gauge
to the table.
Follow the procedures outlined below to correctly set and measure tension on 7.5 through 30 horsepower models 2545 and 7100 with "B"
and "C" belt types.
1. Measure the span length (t) of the drive.
2. Determine the amount of deflection (in inches) required to measure deflection force (in pounds) by multiplying the span length (t) by
1/64. For example, a 32" span length multiplied by 1/64 equals 1/2" of deflection required to measure deflection force.
3. Lay a straight edge across the top outer surface of the belt drive from pulley to sheave.
4. At the center of the span, perpendicular to the belt, apply pressure to the outer surface of the belt with a tension gauge. Force the belt
to the predetermined deflection calculated in step 2. Compare the reading on the tension gauge to the BELT TENSION TABLE in the
DIAGRAMS & TABLES section.
Ensure the pulley and sheave are properly aligned and the motor anchor screws are adequately retightened prior to restarting the
compressor.
Improper pulley/sheave alignment and belt tension can result in motor overload, excessive vibration, and premature belt and/
or bearing failure.
To prevent these problems from occurring, ensure the pulley and sheave are aligned and belt tension is satisfactory after installing new
belts or tensioning existing belts.
EN-10
RELEASED 02/Nov/2023 21:18:09 GMT
Figure 2-5 Setting Belt Tension
CAUTION
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