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Model SQ/BSQ • Centrifugal Inline Exhaust Fans
®
Troubleshooting
WARNING: Before taking any corrective action, make certain unit is not capable of operation during repairs.
PROBLEM CAUSE CORRECTIVE ACTION
Excessive noise
or vibration
Wheel unbalance
Clean all dirt off wheel. Check wheel balance, rebalance in place if
necessary.
Bad bearings Replace.
Belts too tight or too loose Adjust tension, see Figure 16.
Wheel improperly aligned and
rubbing
Center wheel on inlet, see Figure 13.
Loose drive or motor pulleys Align and tighten. See “Pre-Starting Checks”, see page 5-6.
Foreign objects in wheel or housing Remove objects, check for damage or unbalance.
Reduced airow
System resistance too high
Check system: Proper operation of backdraft or control dampers,
obstruction in ductwork, clean dirty lters.
Unit running backwards Correct as shown in Figure 14.
Excessive dirt buildup on wheels Clean wheel.
Improper wheel alignment Center wheel on inlets, see Pre-Starting checks and Figure 13.