Greenheck ERH-20 Installation, Operation And Maintenance Manual page 20

Symptom Possible Cause
One or Both
Blower fan motor overloads are
Blowers Turn Off
tripping and auto-resetting.
Intermittently and
Exhaust Only frost control
Back on After
sensors are tripping.
About 2 Minutes
Air seals are too tight.
"Economizer" sensors are
operating.
Energy Wheel
Does NOT Turn
No power to wheel motor.
Wheel drive belt
Wheel motor overloads are
Energy Wheel
tripping, due to rubbing
Runs Intermittently
between wheel and air seals.
Fan wheel rubbing on inlet
Bearings.
Wheel out of balance.
Loose wheel on shaft.
Loose motor or blower sheave.
Excessive Noise or Belts too loose.
Vibration
Belts too tight.
Worn belt.
Motor base or blower loose.
Build up of material on wheel.
Bearing and drive misaligned.
Noise being transmitted by
duct.
* Always provide the unit model and serial number when requesting parts or service information. * Always check motor amps and compare to nameplate rating.
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
Copyright © 2002 Greenheck Fan Corp.
Trouble Shooting
Corrective Action
Decrease fan speed.
Adjust frost temperature sensor set point as needed.
See Energy Recovery Wheel on page 12
Adjust temperature or enthalpy set points as needed.
Make sure wheel drive is plugged in. 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 on page 12.
Adjust wheel and/or inlet cone. Tighten wheel hub or bearing
collars on shaft.
Replace defective bearings (s). Lubricate bearings. Tighten
collars and fasteners.
Replace or rebalance.
Tighten wheel setscrew.
Tighten sheave setscrew.
Adjust belt tension after 24 hours of operation.
Loosen to maintain a 3/8 inch deflection per foot of span
between sheaves.
Replace.
Tighten mounting bolts.
Clean wheel and housing.
Realign.
Make sure duct work 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.
Warranty
GREENHECK
P.O. BOX 410 SCHOFIELD, WISCONSIN 54476-0410
PH. 715-359-6171
®
www.greenheck.com
IOM ERH FS
Rev. 1 January 2002