TROUBLE SHOOTING
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Electrical Check fuses/circuit breakers, replace if needed. Check for On/Off
switches. Check for correct supply voltage.
Unit is NOT
Drive Check for broken or loose belts. Tighten loose pulleys.
Operating
Motor Check that the motor hp is correct and not tripping overloads.
Fan Wheel Rubbing on Inlet Adjust wheel and/or inlet cone. Tighten wheel hub or bearing
collars on shaft.
Excessive
Bearings Replace defective bearing(s). Lubricate bearings. Tighten collars
Noise
and fasteners.
Belts Tighten sheaves on motor/fan shaft. Adjust belt tension. Align
sheaves properly (see page 14). Replace worn belts or sheaves.
Wheel Out of Balance Replace or rebalance.
Blower Fan Speed too Low Check for correct drives and rpm’s with catalog data.
Fan wheels are operating For 3 phase see Fan Wheel Rotation on page 13.
backwards. Check blower rotation.
Low
Airflow (cfm)
Dirty filters or energy wheel Follow cleaning procedures on page 17.
High Static Pressure Incorrect fan-to-duct connections. Make sure dampers open
appropriately. Increase fan speed.
Blower Fan Speed too High Check for correct fan rpm.
High
Airflow (cfm) Low Static Pressure Make sure grilles, filters, and access doors are installed. Decrease
fan speed.
Blower fan motor overloads are Decrease fan speed.
One or Both Blowers tripping
Turn Off
Exhaust Only or On/Off frost Adjust frost temperature sensor set point as needed.
control sensors are tripping
Air seals too tight See Energy Recovery Wheel on page 12.
Energy Wheel
"Economizer" temperature Adjust temperature or enthalpy set points as needed.
Does NOT Turn
sensors are operating
No power to wheel motor Make sure wheel drive is plugged in. Verify power is available.
Wheel Drive Belt Check for loose or broken belts. Replace belts (consult factory).
Energy Wheel Runs
Wheel motor overloads are Recheck air seals, make sure they are not to tight. See Energy
Intermittently
tripping, due to rubbing Recovery Wheel on page 12.
between 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.
Warranty
Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the
purchase date. The energy recovery wheel is warranted to be free from defects in material and workmanship for a period of
five years from the purchase date. Any units or parts which prove defective during the warranty period will be replaced at
our option when returned to our factory, transportation prepaid.
Motors are warranted by the motor manufacturer for a period of one year. Should motors furnished by Greenheck prove
defective during this period, they should be returned to the nearest authorized motor service station. Greenheck will not be
responsible for any removal or installation costs.
Due to continuing product development, Greenheck has the right to change specifications without notice
IOM ERV - FS
Rev 4 September 2000
Copyright © 2000 Greenheck Fan Corp.
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