Trane UniTrane Installation Operation & Maintenance page 127

Control Device
Replacement
Table 56. Trouble Shooting
Problem
Drain pan is overflowing
Standing water in drain pan
Wet interior insulation
Excess dirt in unit
Microbial growth (mold)
UNT-IOM-6
After removing the fanboard assembly from the unit, disconnect the
fan wheel/wheels from the motor shaft by loosening the Allen head
setscrew on the fan wheel hub collar. Next, remove the mounting
bolts holding the fan motor plate to the mounting bracket of the
fanboard. Then remove the motor by sliding the fan shaft from the fan
wheel hub.
During re-assembly, make certain the fan wheel(s) is/are properly
centered in the fan housing to prevent the fan wheel from contacting
the housing on either side. After the unit has been re-assembled,
verify that no unusual noise or vibration is present at startup.
To order control components such as relays, contactors, transform-
ers, low temperature detection devices, condensate overflow detec-
tion devices, differential pressure switches, sensors, control valves
and actuators, contact the local Trane Service Parts Center. To order,
the Trane parts center will need the unit model number (which can be
found on the unit nameplate), the serial number, and the part name or
ID.
Possible Cause
Plugged drain line
Unit not level
Unit not level
Plugged drain line
Coil face velocity too high
Drain pan leaks/overflowing
Condensation on surfaces
Missing filters
Filter bypass
Moisture problems
Standing water in drain pan
Remedy
Clean drain line
Level unit
Level unit
Clean drain line
Reduce fan speed
Repair leaks
Insulate surfaces
Replace filters
Reduce filter bypass
See "External Insulating
Requirements" section
on page 20.
See "Inspecting and cleaning
the drain pan" section
on page 90.
127