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WARNING
Hazardous Voltage!
Di
sconnect all electric power, including remote
disconnects before servicing. Follow proper
lockout/tagout procedures to ensure the power
can not be inadvertently energized. Failure to
disconnect power before servicing could result
.
in death or serious injury
Table 4. Troubleshooting energy wheels
Probable Cause
Symptom
Wheel will
Motor is not running
not rotate
Excessive friction at the
seals
Energy wheel frame or
spokes are bent or warped
During winter operation,
excessive frost/ice forms
in the heat transfer media
Drive belt is broken
Wheel main shaft bearing
is seized
Loss of
Wheel is not rotating
wheel
Wheel is rotating too
capacity
slowly
Energy transfer surface is
contaminated
Frost/ice forms on heat
transfer surfaces
Worn
Maximum wheel pressure
diameter
drop exceeded
seals
Seal adjusted too tight
CLCH-SVX02C-EN
Troubleshooting
WARNING
Toxic Hazards!
Do not use an energy wheel in an application
where the exhaust air is contaminated with
harmful toxins or biohazards, which could
.
result in death or serious injury
Recommended Action
The fuse or circuit breaker may be blown or open. Check the breaker/fuse box and replace.
There may be a loss of incoming power. Attempt to trace the power loss back to its source
and correct.
The motor may have failed. Check for power at the motor terminals. If present, disconnect
the belt from the motor pulley and see if the motor runs without a load. If it still doesn't
run, replace the motor.
The motor may have failed because it is connected to a variable frequency drive.
Disconnect the VFD and run the motor on 60 Hz power only.
Re-adjust the diameter seals per the Seal Adjustment procedure.
Inspect the wheel, locate the bent section, and straighten the section or replace the frame.
Disconnect power to the wheel motor, adjust outside air dampers shut and let the wheel
thaw. After the initial section thaws, rotate the wheel 90° by hand until the "new" section
rotates into the warm exhaust air stream. Continue this procedure until the wheel is
completely thawed.
Inspect visually. Replace the drive belt.
Replace the seized bearing.
See above
Belt is stretched, slipping. Replace the belt
Ice forms on the wheel; thaw per above.
Seized bearing on the main shaft; replace the bearing.
Excessive friction in seals; adjust.
Clean the energy transfer surfaces. Consider purchasing a second set of energy transfer
segments for continuous operation while cleaning.
Replace the energy transfer segments if they are severely contaminated and cannot be
cleaned. Consider adding a contaminate filter before (upstream) the energy wheel.
Thaw the wheel surfaces per procedure above. Consider adding outside air preheat.
Adjust wheel airflow so that the pressure drop across the wheel is less than 1.25 inches wg.
Adjust seals per procedure in "Seal Adjustment" on page 17.
WARNING
Rotating Parts!
Disconnect all electrical and remote
disconnects before servicing. Secure drive
sheaves to ensure rotor cannot freewheel. Keep
hands away from the rotating wheel! Contact
with the rotating wheel can cause physical
injury.
19
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