Trane LO - Manual (Page 127)

UNT-IOM-6 127
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.
Control Device
Replacement
Table 56. Trouble Shooting
Problem
Possible Cause Remedy
Drain pan is overflowing Plugged drain line Clean drain line
Unit not level Level unit
Standing water in drain pan Unit not level Level unit
Plugged drain line Clean drain line
Wet interior insulation Coil face velocity too high Reduce fan speed
Drain pan leaks/overflowing Repair leaks
Condensation on surfaces Insulate surfaces
Excess dirt in unit Missing filters Replace filters
Filter bypass Reduce filter bypass
Microbial growth (mold) Moisture problems See “External Insulating
Requirements” section
on page 20.
Standing water in drain pan See “Inspecting and cleaning
the drain pan” section
on page 90.