Greenheck SQ and BSQ (477180) - Manual (Page 13)

13 Centrifugal Inline Fans
®
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 12.
Wheel improperly aligned and
rubbing
Center wheel on inlet, see Figure 9.
Loose drive or motor pulleys Align and tighten. See “Pre Start-Up Checks”, see page 7-8.
Foreign objects in wheel or
housing
Remove objects, check for damage or unbalance.
Reduced airflow
System resistance too high
Check system: Proper operation of backdraft or control
dampers, obstruction in ductwork, clean dirty filters.
Unit running backwards Correct as shown in Figure 10.
Excessive dirt buildup on wheels Clean wheel.
Improper wheel alignment
Center wheel on inlets, see Pre Start-Up Checks and Figure 9.
WARNING
Before taking any corrective action, make certain unit
is not capable of operation during repairs.
AVERTISSEMENT
Avant d’entreprendre toute action corrective, s’assurer
que l’appareil ne pourra pas fonctionner durant les
réparations.
Troubleshooting