Greenheck Fan HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING HRE-20 - Manual (Page 44)

*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 Cause Symptom 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 under Unit Start-Up section .
‘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 under Unit Start-Up Section .
Fan wheel rubbing on inlet Adjust wheel and/or inlet cone . Tighten wheel hub or bearing
collars on shaft .
Bearings . Replace defective bearings (s) . Lubricate bearings . 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 .
Build-up of material on wheel . Clean wheel and housing .
Bearing and drive misaligned . Realign .
Noise being transmitted by
duct . 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 .
Excessive Noise or
Vibration
Troubleshooting
#461248 IOM HRE FS
Rev . 4, April 2012
Copyright © 2012 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 specifications without notice .