FloAire DMUA User Manual
Page 20
20
Pulley Adjustment (Belt Drive Fans)
The adjustable motor pulley is factory set for the RPM specified. Speed can be increased by closing or
decreased by opening the adjustable motor sheave. Two groove variable pitch pulleys must be adjusted
an equal number of turns open or closed. Any increase in speed represents a substantial increase in
horsepower required by the unit. Motor amperage should always be checked to avoid serious damage to
the motor when the speed is varied. Always torque setscrews according to the setscrew torque chart.
Pulley Alignment
Proper Belt Tension