Torit Backward Inclined Fan, TBI-3 through 30
14
Problem
Probable Cause
Remedy
Excessive vibration
Externally transmitted vibration
Isolate collector from external vibration.
Accumulation of foreign
material on the wheel
Clean the wheel.
Excessive system pressure or
restriction of airflow due to
closed dampers
Open dampers far enough for fan to operate in stable
flow regime.
Inadequate performance
Fan running too slowly
Check power frequency against fan motor design
frequency.
Fan wheel rotating in wrong
direction or installed backwards
on shaft
Proper fan rotation is clockwise from the top of the
fan. The fan can be viewed through the back of the
motor.
Poor system design, closed
dampers, air leaks or clogged
filters
Check system for damper positions leak points.
Check filter Delta P.
Sharp deflection of airstream at
fan outlet
Do not place fan discharge next to a wall.
Missing discharge fittings
Install discharge fittings.
Excessive noise
Fan operating near “stall” due
to incorrect system design or
installation
Correct system or replace with correctly sized fan.
Vibration originating elsewhere
in the system
Vibration isolate collector from the system.
Loose accessories or
components
Tighten accessories or components.
