Greenheck PVE-20 Installation, Operation And Maintenance Manual page 28

Troubleshooting – Unit
Symptom Possible Cause
One or both
blowers turn off
intermittently and Exhaust Only frost control sensors are tripping.
back on after
about 2 minutes
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.
28
Model PVe Heat Recovery Unit
Corrective Action
Adjust frost temperature sensor set point as
needed.
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.