ECM Overview and Setup
UNT-SVX041D-EN
35
with 3-mm screws. The field-supplied wires should have
an insulation rating of 600 V.
VelociTach Motor Control Board
The motor control board functions and unit specific
settings are summarized on the motor control board
configuration label affixed to the back side of the control
panel low voltage lid on every unit.
To check status, configuration, or to change settings on the
motor control board with the power on the unit, remove
the two screws at the top of the low voltage access lid and
open.The motor control board will be visible. See the
following figure.
The motor control board features a nested menu
integrated user interface (UI) that supports:
•
Status display for instant touch-free confirmation of
unit operation.
•
Configuration parameter and value display and
modification changes (using integrated menu/set
buttons).
•
Error code prioritized reporting.
Note:
Characters on the VelociTach motor control board
display appear in red, on a black background.
The display contains decimal positions as well that change
position with each parameter, as appropriate. Under
normal conditions (i.e., with no error code displayed), the
status will loop the following message:
WARNING
Safety Alert!
You MUST follow all recommendations below. Failure
to do so could result in death or serious injury.
All settings take effect immediately, including fan
startup and enabling of electric heat. Caution should be
taken to stay clear of hazardous voltages, moving parts
and electric heat elements while making adjustments
to the motor control board. If it is not practical to stay
clear of these areas during adjustment of the motor
control board, please contact Trane Global Parts for
configuration kit that allows easy powering of the
motor control board outside of the unit with a
9V battery.
CAUTION
Burn Hazard!
Failure to follow this instruction could result in the unit
overheating and becoming hot to the touch, which
could result in minor or moderate injury, and/or
equipment damage. On electric heat units, certain
parameter values are locked out to prevent overheating
of the unit. These functions will appear to be saved;
however, they will not be accepted if the Electric Heat
Protection setting is “On”. Do not change the Electric
Heat Protection setting to “Off” and make changes to
the protected settings unless you are programming an
unconfigured service replacement board to match the
unit settings on a ECM configuration label.
Figure 21.
VelociTach motor control board
