Greenheck ERV Series Installation, Operation And Maintenance Manual page 31

Troubleshooting – Unit
Symptom Possible Cause
One or both
blowers turn off
Exhaust Only frost control sensors are
intermittently and
tripping.
back on after
about 2 minutes
Air seals are too tight.
"Economizer" sensors are operating.
Energy wheel does
No power to wheel motor.
NOT turn
Wheel drive belt.
VFD overload. (OL1 on readout)
Energy wheel runs Wheel motor overloads are tripping, due to
intermittently rubbing between wheel and air seals.
Fan wheel rubbing on inlet.
Bearings.
Wheel out of balance.
Loose wheel on shaft.
Loose motor or blower sheave.
Belts too loose.
Excessive noise
Belts too tight.
or vibration
Worn belt.
Motor base or blower loose.
Buildup of material on wheel.
Bearing and drive misaligned.
Noise being transmitted by duct.
Always have a completed Pre Start-Up Checklist, unit Start-Up Checklist, and Optional Accessories Checklist prior to requesting parts or
service information.
®
Corrective Action
Adjust frost temperature sensor set point as
needed.
See Energy Recovery Wheel under Unit
Start-Up section.
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).
Refer to VFD section. Compare motor amp
rating to setting in VFD. Adjust accordingly.
Recheck air seals, make sure they are not
too tight. See Energy Recovery Wheel under
Unit Start-Up Section.
Adjust wheel and/or inlet cone. Tighten
wheel hub or bearing collars on shaft.
Replace defective bearing(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 ductwork is supported properly.
Make sure ductwork metal thickness is
sized for proper stiffness. Check duct size at
discharge to ensure that air velocities are not
too high.
Energy Recovery Ventilator 31