Troubleshooting - Greenheck FumeJet FJC-300 Installation, Operation And Maintenance Manual

Troubleshooting

WARNING
Before taking any corrective action, make certain unit
is not capable of operation during repairs.
Problem
Excessive Noise
Low CFM
High CFM
Static Pressure Wrong
High Motor Amp Draw
Fan Doesn't Operate
Overheated Bearing
Excessive Vibration
* Always check motor amps and compare to nameplate rating. Excessive fan speed may overload the motor and
result in motor failure. Do not exceed the maximum cataloged rpm of the fan.
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Cause
Wheel Rubbing Inlet
V-Belt Drive
Bearings
Wheel Unbalance
Fan
Duct System
Fan
Duct System
Duct system has more
or less restriction than
anticipated
Fan
Duct System
Electrical Supply
Drive
Motor
Lubrication
Mechanical
Belts
System Unbalance
AVERTISSEMENT
Avant d'entreprendre toute action corrective, s'assurer
que l'appareil ne pourra pas fonctionner durant les
réparations.
Corrective Action
Adjust wheel and/or inlet cone.
Tighten wheel hub or bearing collars on shaft.
Tighten sheaves on motor/fan shaft. Adjust belt tension. Align
sheaves properly (see procedure).
Replace worn belts or sheaves.
Replace defective bearing(s). Lubricate bearings.
Tighten collars and fasteners.
Clean all dirt off wheel. Check wheel balance.
Check wheel for correct rotation.
Higher pressure than design. Filters need replacement.
Decrease fan speed.
Resize ductwork. Access door, filters, dampers not installed.
Remove obstructions in system. Use correction factor to
adjust for temperature/altitude. Resize ductwork. Clean filters/
coils. Change fan speed.*
Check rotation of wheel. Reduce fan speed.
Resize ductwork. Check proper operation of isolation and
bypass dampers. Check filters and access doors.
Check fuses/circuit breakers. Check for switches turned off or
disconnected. Check for correct supply voltage.
Check for broken belts. Tighten loose pulleys.
Assure motor is correct horsepower and not tripping overload
protector.
Check for excessive or insufficient grease in the bearing.
Replace damaged bearing. Relieve excessive belt tension.
Align bearings. Check for bent shaft.
Adjust tightness of belts. Replacement belts should be a
matched set.
Check alignment of shaft, motor and pulleys. Adjustable
pitch pulleys with motors over 15 hp are especially prone to
unbalance. Check wheel balance, rebalance if necessary.
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FumeJet Fume Exhaust Fans 19