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