Troubleshooting
CLCH-SVX07K-EN 167
Energy wheel or
CDQ wheel will
not rotate
Motor is not running
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.
Excessive friction at the seals
Re-adjust the diameter seals. See “Energy Wheel Seal Adjustment,”
p. 160 or “CDQ Seal Adjustment,” p. 154.
Energy wheel frame or spokes are bent or warped
Inspect the wheel, locate the bent section, and straighten the section or
replace the frame.
During winter operation, excessive frost/ice forms
in the heat transfer media
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 degrees by hand until the “new” section rotates into the warm exhaust
air stream. Continue this procedure until the wheel is completely thawed.
Drive belt is broken Inspect visually. Replace the drive belt.
Wheel main shaft bearing is seized Replace the seized bearing.
Loss of energy
wheel capacity
Wheel is not rotating See above
Wheel is rotating too slowly
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.
Energy transfer surface is contaminated
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.
Frost/ice forms on heat transfer surfaces
Thaw the wheel surfaces per procedure above. Consider adding outside
air preheat.
Worn diameter
seals in energy
wheel
Maximum wheel pressure drop exceeded
Adjust wheel airflow so that the pressure drop across the wheel is less
than 1.25 inches wg.
Seal adjusted too tight Adjust seals. See “Energy Wheel Seal Adjustment,” p. 160.
UV light fails
Ballast fails to energize light.
Disconnect high voltage leads (green, white, and black connectors) from
the ballast enclosure. Wait for three minutes, this will reset the end-of-
light circuitry and then reconnect.
End of life. Replace bulb. See “Replacing the Bulbs,” p. 163.
Table 56. Air handler troubleshooting recommendations (continued)
Symptom Probable Cause Recommended Action
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