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Troubleshooting
Symptom
Electrical
Unit is NOT
operating
Motor
Fan wheel rubbing on inlet
Excessive noise
Bearings
Wheel out of balance
Fan speed too low
Fan wheels are operating
backwards
Low airflow (cfm)
Dirty filters or energy wheel
High static pressure
Fan speed too high
High airflow (cfm)
Low static pressure
Air seals too tight
Energy wheel does
No power to wheel motor
NOT turn
Wheel drive belt
Wheel motor overloads are
Energy wheel runs
tripping due to rubbing between
intermittently
wheel and air seals.
Always provide the unit model and serial number when requesting parts or service information. Always check
motor amps and compare to nameplate rating.
14
Energy Recovery Ventilator
Possible Cause
Corrective Action
Check fuses/circuit breakers, replace if needed. Check
for On/Off switches. Check for correct supply voltage.
Check motor horsepower is correct and not tripping
overloads.
Adjust wheel and/or inlet cone. Tighten wheel hub or
bearing collars on shaft.
Replace defective bearing(s). Lubricate bearings.
Tighten collars and fasteners.
Clean, replace or rebalance.
Check for correct rpms with catalog data.
Refer to Blower Wheel Rotation information on page 12.
Replace filters and/or follow the cleaning procedures.
Incorrect fan-to-duct connections. Make sure dampers
open appropriately. Increase fan speed
Check for correct fan rpm.
Make sure grilles, filters and access doors are installed.
Decrease fan speed.
Refer to Energy Recovery Wheel, Air Seals on page 12.
Make sure wheel drive is plugged in/connected. Verify
power is available.
Check for loose or broken belts. Replace belts; consult
factory.
Recheck air seals, make sure they are not too tight. See
Energy Recovery Wheel, Air Seals on page 12.
®
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