Safety Requirements; Setup; Velocitach Motor Control Board - Trane BCHE Installation, Operation And Maintenance Manual

ECM Overview and Setup

Safety Requirements

Follow all recommendations below. Failure to do so could
result in death or serious injury.
• The ECM motors contain capacitors which store
residual energy. Please keep clear of the fan wheels for
5 minutes after the power has been removed from the
system, as a power request with the motor powered off,
could result in a very short period of actuation.
• 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 VelociTach 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.
• Changes to switch settings on the CSTI adapter board
take effect immediately. Changes should be made to
the CSTI configuration switches with the power off.
• Initial hookups to the CSTI and Standard Adapter
board, including low voltage interconnections, must be
made with the power off.
• Do not make connections to the motors or the adapter
boards while power is ON. Do not remove connections
to the motor or the adapter boards while the power is
ON.
• Do not free spin the fan wheels with your hands while
the unit is powered on. The system is constantly
scanning and responding to the operational status of
the motors.

Setup

Note: Normally, Trane ECMs are configured for soft ramps
and transitions between speeds. However, to aid in
commissioning of the unit, for approximately 10–
15 minutes, the ramps will be shortened to quickly
observe proper unit behavior and response to
speeds.
For new installations, all boards and motors are pre-
installed and pre-configured according to the unit
configuration, indicated by its model number.
Under normal and intended operation, the only required
intervention specific to the new ECM units is the wiring of:
• Wall-mounted low-voltage fan speed switch inputs to
the adapter boards' terminal strips and 24 Vac tap to
field-installed fan speed switch.
• Field-supplied controllers/thermostats to the adapter
boards' terminal strips and 24 Vac power tap to field
supplied controller/thermostat.
• Adjustment and calibration of the variable speed inputs
(VSP/0–10V) on the system.
• Adjustment, calibration or disabling of the optional
auto-changeover function on CSTI units.
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Otherwise, proceed with the mechanical, electrical and
controls installations as defined in other sections of this
manual, following all warnings and cautions.
After installation, turn power on.
Note: Specifications subject to change without notice.
Consult the unit submittals and unit schematics
before determining hookup requirements. Terminal
block positions, polarities and assignments are
determined for specific unit configurations only.
Signal assignments are indicated, for reference only.
Both adapter boards come equipped with integrated
terminal blocks to hook up to the field supplied/mounted
fan speed switches and external controls. Connections
should be made to the screw terminals with wires between
16 AWG and 24 AWG, with a ~4–5mm wire strip length.
The terminal blocks have 5mm spacing, and are equipped
with 3mm screws. The field-supplied wires should have an
insulation rating of 600V.

VelociTach Motor Control Board

WARNING
Safety Alert!
Failure to follow instructions below could result in
death or serious injury.
In addition to the following tasks, you MUST:
• Follow all instructions in the unit's Installation,
Operation, and Maintenance manual, including
warnings, cautions, and notices.
• Perform all required tasks in any applicable
Service Alerts and Service Bulletins.
• Review and understand all information provided
in Submittals and Design Specifications.
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.
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.
BCX-SVX002A-EN