Troubleshooting – Unit

Symptom

Possible Cause

Corrective Action

 

 

 

 

CFM too high.

Check cfm and adjust drives if needed.

 

 

 

 

Static pressures are higher or lower than design.

If higher, ductwork should be improved.

 

If lower, fan rpm should be lower.

 

 

 

 

 

Motor over amps

Blower rotation is incorrect.

Check rotation and reverse if necessary.

 

 

Motor voltage incorrect.

Check motor nameplate versus supplied voltage.

 

 

 

 

 

Motor horsepower too low.

See specifications and catalog for fan curves to

 

determine if horsepower is sufficient.

 

 

 

 

 

 

Shorted windings in motor.

Replace motor.

 

 

 

 

Unit damper not fully open.

Adjust damper linkage or replace damper motor.

 

 

 

 

System static pressure too high.

Improve ductwork to eliminate losses using good

 

duct practices.

 

 

 

 

 

 

Blower speed too low.

Check for correct drives and rpm with catalog data.

 

 

 

 

Fan wheels are operating backwards.

For 3-phase, direction can be reversed by

 

interchanging any two of the three electrical leads.

Low airflow (cfm)

 

 

 

Dirty filter.

Follow cleaning procedures in Routine Maintenance

 

 

section.

 

 

 

 

 

 

Leaks in ductwork.

Repair.

 

 

 

 

Elbows or other obstructions may be obstructing

Correct or improve ductwork.

 

fan outlet.

 

 

 

 

 

 

Belt slippage.

Adjust belt tension.

 

 

 

 

Blower fan speed too high.

Check for correct fan rpm. Decrease fan speed if

 

necessary.

 

 

 

 

 

High airflow (cfm)

Filter(s) not in place.

Install filters.

 

 

 

Insufficient static pressure (Ps) (airflow

Induce Ps into system ductwork. Make sure grilles

 

and access doors are installed. Decrease fan speed if

 

resistance).

 

necessary.

 

 

 

 

 

 

Fan wheel rubbing on inlet.

Adjust wheel and/or inlet cone. Tighten wheel hub or

 

bearing collars on shaft.

 

 

 

 

 

 

Bearings.

Replace defective bearing(s). Lubricate bearings.

 

Tighten collars and fasteners.

 

 

 

 

 

 

Wheel out of balance.

Replace or rebalance.

 

 

 

 

Loose wheel on shaft.

Tighten wheel setscrew.

 

 

 

 

Loose motor or blower sheave.

Tighten sheave setscrew.

 

 

 

 

Belts too loose.

Adjust belt tension after 24 hours of operation.

Excessive noise

 

 

Belts too tight.

Loosen to maintain a 3/8 inch deflection per foot of

or vibration

span between sheaves.

 

 

 

 

 

 

Worn belt.

Replace.

 

 

 

 

Motor base or blower loose.

Tighten mounting bolts.

 

 

 

 

Buildup of material on wheel.

Clean wheel and housing.

 

 

 

 

Bearing and drive misaligned.

Realign.

 

 

 

 

 

Make sure ductwork is supported properly. Make

 

Noise being transmitted by duct.

sure ductwork metal thickness is sized for proper

 

stiffness. Check duct size at discharge to ensure that

 

 

 

 

air velocities are not too high.

 

 

 

Always have a completed Pre Start-Up Checklist and Unit Start-Up Checklist prior to requesting parts or service information.

30 Model ERCH-HP Energy Recovery Unit

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Greenheck Fan 473501 manual Resistance
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