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Ensure that all mounting hardware and fasteners are properly installed and tightened to recommended torque specifications.
Ensure that the wheel is aligned and has the correct spacing in relation to the inlet venturi; it should be centered in the inlet venturi
as well. If adjustment is needed, loosen the inlet venturi bolts and shift the inlet venturi until the radial gap is the same at every point
across the circumference of the inlet venturi.
If adjustment of the overlap between the wheel and inlet venturi is needed, loosen the taper lock bushing, slide the wheel forwards
or backwards until the correct overlap is achieved, and then tighten the set screws back down.
There is a rotation sticker on the unit that specifies the direction the wheel should turn. Ensure that the wheel is rotating in the proper
direction before powering on the unit. In 3 phase units, simply switch two incoming leads to reverse rotation.
PRE-START-UP CHECKS
Airflow
A
Notes: Any increase in fan speed represents a substantial increase in horsepower required from the motor. Always check motor load amperage
and compare to nameplate rating when changing fan speed.
Gap/ overlap dimensions
Size
Inlet Venturi to Wheel Overlap Dimensions A (inches)
122
0.39
135
0.43
150
0.46
165
0.47
182
0.51
200
0.57
222
0.66
245
0.76
270
0.83
300
0.92
330
1.02
365
1.12
402
1.27
445
1.33
490
1.49
542
1.65
600
1.98
