Trane Climate Changer TCFS Nstallation, Operation, And Maintenance page 83

Table 11. Air handler troubleshooting recommendations
Symptom Probable Cause
Motor is not running
Energy wheel
will 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
Wheel is not rotating
Wheel is rotating too slowly
Loss of energy
wheel capacity
Energy transfer surface is contaminated
Frost/ice forms on heat transfer surfaces
Worn diameter
Maximum wheel pressure drop exceeded
seals in energy
wheel
Seal adjusted too tight
Ballast fails to energize light.
UV light fails
End of life.
CLCH-SVX010A-EN
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. See
p. 76.
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 degrees 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. See "Energy Wheel Seal Adjustment," p.
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.
Replace bulb. See "Replacing the Bulbs," p.
Troubleshooting
"Energy Wheel Seal Adjustment,"
76.
80.
83