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Problem Probable Cause Solution
Inadequate Wheel
Performance
Incorrect wheel rotation speed Check wheel rotation speed
Worn wheel media or worn/out-of-place
seals
Check wheel integrity and seals
Adjust and/or replace seals
Unanticipated entering air conditions
Check entering air conditions and compare
to design
Dirty media Check media for dirt and clean
Improper Wheel
Rotation
Misaligned belts
Check drive belts for engagement
with sheaves
Improper motor operation
Check drive motor and drive motor wiring
for proper voltage
Improper VFD operation Check VFD programming
Improper VFD sensor operation
Check VFD input sensor (temperature/
relative humidity) for malfunctioning
High Pressure Drop
Unanticipated airflow Check airflow and compare to design
Dirty filters Check filters and clean/replace
Dirty media Check media for dirt and clean
Noise
Out-of-place seals Check seals and adjust
Worn bearings Check bearings
Misaligned belts Check belts for slippage
Table 13.5: Energy Conservation Wheel
PR Series Installation, Operation, and Maintenance Manual
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