Trane LO - Manual (Page 108)

Terminal Unit
Control (TUC)
108 UNT-IOM-6
Remove the 24 VAC power from the board and then reapply it to
cycle the unit through a power-up sequence. By default, the controller
attempts to reset all diagnostics at power-up.
The TUC editor’s reset failure point allows the user to reset controller
diagnostics. Also, Tracer ® versions 14.4 and higher provide a “+
enter” option from the TUC service summary screens that allow
latching diagnostic reset.
When using a Tracer Summit ® system, reset the unit diagnostics with
the reset diagnostics button on the TUC editor screen.
The unit’s operating machine state is in standby when one of the
following conditions occurs:
1. Tracer ® override is present.
2. During the power-up sequence or any time when the TUC is
calibrating its end devices.
3. When the TUC is in the unoccupied mode and there is no call for
heating or cooling.
4. In the occupied mode when the desired capacity is unavailable.
ie: the TUC requests a 2-pipe unit to heat, yet no hot water or electric
heat is available. The TUC will list the unit as being in standby mode.
Unit Mode Listed
as Standby
Cycling Power to the
TUC
Using Tracer 100i ™ or
100L ™
Using Tracer Summit ®