FloAire High Velocity Restaurant Duty Utility Set - Manual (Page 4)

4
MOTOR PULLEY ADJUSTMENT
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.
In order to adjust the pulley there is an adjustable sheave on the motor. There are two hex set screws on the
pulley. One secures the pulley to the shaft. The other allows the two halves of the pulley to be adjusted
closer together or further apart. Be sure when adjusting retighten the set screws on a flat side of the pulley
base. Adjusting the halves closer together increases the fan speed, further apart slows it down. Double
grove pulleys must be turned the same number of turns or the belts will not seat properly in the groves.
Always check motor amperage after adjusting pulleys.
MAINTENANCE
WARNING: DO NOT ATTEMPT MAINTENANCE ON THE FAN UNTIL THE ELECTRICAL
SUPPLY HAS BEEN COMPLETELY DISCONNECTED.
1. Fan inlet and approaches to ventilator should be kept clean and free from any obstruction.
2. Motors are permanently lubricated. Check bearings periodically, if they have grease
fittings lubricate each season. Use caution when lubricating bearings, wipe the fittings
clean, the unit should be rotated by hand while lubricating. Caution: Use care when
touching the exterior of an operating motor. Motors normally run hot and may be
hot enough to be painful or cause injury.
3. Belt tension should be checked after two days of fan operation and each season
thereafter. See instructions elsewhere in this manual. Over-tightening will cause
excessive bearing wear and noise. Too little tension will cause slippage at startup and
uneven wear.
4. Wheels require very little attention when moving clean air. Occasionally oil and dust may
accumulate causing imbalance. If the fan is installed in a corrosive or dirty atmosphere,
periodically inspect and clean the wheel, inlet and other moving parts to ensure smooth
and safe operation. Remove bolted access panel to steam clean wheel. Swing fan up and
away to steam clean duct work,
5. All fasteners should be checked for tightness each time maintenance checks are
preformed prior to restarting unit.