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GREENHECK
P.O. BOX 410 SCHOFIELD, WISCONSIN 54476-0410
PH. 715-359-6171
www.greenheck.com
#462255 APEX IOM FS
Rev. 1 March 2004
Copyright © 2004 Greenheck Fan Corp.
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.
As a result of our commitment to continuous improvement,
Greenheck reserves the right to change specificaions without notice.
* Always provide the unit model and serial number when requesting parts or service information. * Always check motor amps and compare to nameplate rating.
Energy Wheel
Does NOT Turn
Blower fan motor overloads are
tripping and auto-resetting.
Decrease fan speed.
Possible CauseSymptom Corrective Action
Exhaust Only frost control
sensors are tripping.
Adjust frost temperature sensor set point as needed.
Air seals are too tight.
See Energy Recovery Wheel on page 17.
“Economizer” sensors are
operating.
Adjust temperature or enthalpy set points as needed.
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).
One or Both
Blowers Turn Off
Intermittently and
Back on After
About 2 Minutes
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 on page 17.
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 bearing(s). Tighten
collars and fasteners.
Wheel out of balance.
Replace or rebalance.
Loose wheel on shaft.
Tighten wheel setscrew.
Energy Wheel
Runs Intermittently
Loose motor or blower sheave.
Tighten sheave setscrew.
Belts too loose.
Adjust belt tension after 24 hours of operation.
Belts too tight.
Loosen to maintain a 3/8 inch deflection per foot of 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.
Noise being transmitted by
duct.
Make sure ductwork is supported properly. Make sure duct-
work metal thickness is sized for proper stiffness. Check duct
size at discharge to ensure that air velocities are not too high.
Excessive Noise or
Vibration
Troubleshooting