Trane LO manual Control Device Replacement, Trouble Shooting, Problem Possible Cause Remedy

Control Device

Replacement

Table 56. Trouble Shooting

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.

Problem Possible Cause Remedy

Drain pan is overflowing

Standing water in drain pan

Wet interior insulation

Excess dirt in unit

Microbial growth (mold)

Plugged drain line	Clean drain line
Unit not level	Level unit
Unit not level	Level unit
Plugged drain line	Clean drain line
Coil face velocity too high	Reduce fan speed
Drain pan leaks/overflowing	Repair leaks
Condensation on surfaces	Insulate surfaces
Missing filters	Replace filters
Filter bypass	Reduce filter bypass
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.

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