Greenheck LD/LDP/LB/LBP (453283) - Manual (Page 7)

Centrifugal Roof Exhaust Fans 7
®
PROBLEM CAUSE CORRECTIVE ACTION
Reduced Airflow
System resistance too high
Check system for proper operation of backdraft or
control dampers; remove obstructions in ductwork, etc.
Unit running backwards See Pre-Starting Checks.
Fan speed too low Increase fan speed.
Excessive dirt buildup on wheel Clean wheel.
Improper wheel alignment Center wheel on inlets.
Excessive Noise
or Vibration
Bad Bearings Replace.
Belts too tight or too loose Refer to Figure 4 and adjust tension.
Wheel improperly aligned and
rubbing
Center wheel on inlets. See Figure 1.
Loose drive or motor pulleys Align and tighten. See Pre-Start-up Checks.
Foreign objects in wheel or housing Remove objects, check for damage or unbalance.
Unbalance of wheel caused by
excessive dirt and grease buildup
Remove buildup.
Job Information
Job Name: ___________________________________ Service Organization: ______________________________
Address: _____________________________________ Address: _________________________________________
City: ________________________________________ City: _____________________________________________
State: _______________ Zip: __________________ State: ____________ Zip: __________________________
Phone: ______________________________________ Phone: ___________________________________________
Contact Person: ______________________________ Work Done By: ____________________________________
Nameplate Information Field Start-Up Documentation
Model: ______________________________________
Volts: _________ Hertz: ________ Phase: ______ Actual Voltage: _________ Hertz: _____ Phase: _____
Amps: _______________ Mark: ________________ Actual Amperage: _________________________________
Supply hp: ___________ Exhaust hp: ___________ Blower Rotation: __________________________________
Serial Number: _______________________________ Air Volume: Design cfm: _________________________
Model Voltage: _______________________________ Actual cfm: __________________________
Motor Amperage: _____________________________ Level of fan (L or H): _______________________________
Fan RPM: ______________________________________ Fan RPM Range (min.) ____________ (max.) ___________
Maintenance Documentation
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