FloAire DMUA - Manual (Page 24)

24
2 weeks after startup
1. Belt tension should be checked after the first 2 weeks of fan operation on belt drive fans. Belts tend to
stretch and settle into pulleys after an initial start-up sequence. Do not tension belts by changing the
setting of the motor pulley, this will change the fan speed and may damage the motor. To re-tension
belts, turn the power to the fan motor OFF. Loosen the fasteners that hold the motor to the fan. Move the
motor to the left or right to adjust the belt tension. Belt tension should be adjusted to allow 1/64” of
deflection per inch of belt span. Exercise extreme care when adjusting V-belts as not to misalign pulleys.
Any misalignment will cause a sharp reduction in belt life and produce squeaky noises. Over-tightening will
cause excessive belt and bearing wear as well as noise. Too little tension will cause slippage at startup and
uneven wear. Whenever belts are removed or installed, never force belts over pulleys without
loosening motor first to relieve belt tension. When replacing belts, use the same type as supplied by the
manufacturer. On units shipped with double groove pulleys, matched belts should always be used.
2. All fasteners should be checked for tightness each time maintenance checks are preformed prior to
restarting unit.
Every 3 months
1. Belt tension should be checked quarterly for belt drive fans. See instructions in the previous maintenance
section. Over-tightening will cause excessive bearing wear and noise. Too little tension will cause slippage
at startup and uneven wear.
2. Fans need to be cleaned quarterly, and more often in severe conditions.
Yearly
1. Inspect bearings for wear and deterioration. Replace/grease if necessary.
2. Inspect belt wear and replace torn or worn belts on belt drive fans.
3. Inspect bolts and set screws for tightness. Tighten as necessary.
4. Inspect motor for cleanliness. Clean exterior surfaces only. Remove dust and grease from the motor
housing to ensure proper motor cooling. Remove dirt and grease from the wheel and housing to prevent
imbalance and damage.