485448 • SQ Mixed Flow, Rev. 3, April 2024 Copyright 2024 © Greenheck Fan Corporation12
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature
section of the website at Greenheck.com/Resources/Library/Literature.
®
Phone: 715.359.6171 • Fax: 715.355.2399 • Parts: 800.355.5354 • E-mail: gfcinfo@greenheck.com • Website: www.greenheck.com
Our Commitment
AMCA Publication 410-96, Safety Practices for Users and Installers of Industrial and Commercial Fans, provides additional safety
information. This publication can be obtained from AMCA International, Inc. at www.amca.org.
PROBLEM CAUSE CORRECTIVE ACTION
Excessive noise
or vibration
Wheel unbalance
Clean all dirt off wheel. Check wheel balance, rebalance in
place if necessary.
Wheel improperly aligned and
rubbing
Center wheel on inlet cone, see Figure 1 (page 9).
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. See Operation (page 9), step 4, to correct wheel
rotation.
Excessive dirt buildup on wheel Clean wheel.
Improper wheel alignment Center wheel on inlet cone, see Figure 1 (page 9).
For Vari-Green
®
motor troubleshooting, refer to the Vari-Green Motor Installation, Operation, and Maintenance
Manual.
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
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