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START-UP AND OPERATION
Figure 4: Pulley Alignment
Before placing hand on impeller or belts, lock out power source. Check all set-screws and keys. Tighten when necessary.
Whenever belts are removed or installed, never force belts over pulleys without loosening motor first, to relieve belt
tension.
CAUTION
CAUTION
Belt Tension and Pulley Alignment
Check condition of belts and the amount of tension prior to start-up. DO NOT over-tighten, as bearing damage will occur.
Recommended belt tension should permit deflection of 1/64” per inch of span on each side of belt measured halfway between
pulley centerline. Exercise extreme care when adjusting belts so as not to misalign the pulleys. Any misalignment will cause a sharp
reduction in belt life and produce squeaky, annoying noises. On units equipped with two groove pulleys, adjust all belts with equal
tension.
Make sure inlets and approaches to the unit are free from obstruction. To ensure maximum air movement, make sure adequate
supply air is available.
Before putting fan into operation, complete the following check list:
a. Turn off and LOCK OUT power source.
b. Make sure installation is in accordance with manufacturer’s instructions.
c. Check and tighten all fasteners.
d. Spin propeller to see if rotation is free.
e. Check all set-screws and keys; tighten if necessary.
f. Torqued set screws have a colored Torque Seal mark indicating the correct torque has been applied.
g. Check belt or direct drive coupling for alignment (use recommended belt tension gauges).
h. Check belt for proper sheave selection.
i. Make sure there is no foreign or loose material in ductwork leading to and from fan or in the fan itself.
j. Properly secure all safety guards.
k. Secure all access doors to fan and ductwork.
l. Check line voltage with motor nameplate.
m. Check wiring.
Carefully inspect the unit before start-up. All motor bearings should be properly lubricated, and all fasteners should be securely
tightened. Rotate propeller by hand to ensure free movement.
