Troubleshooting (Ecm) - Trane HUV Installation, Operation And Maintenance Manual

Table 53. Outdoor air damper remains open
Probable
Cause Explanation
Unit wiring The wiring between the controller outputs and the outdoor
air damper must be present and correct for normal outdoor
air damper operation. Refer to applicable wiring diagram.
Failed end Check damper actuator to ensure proper operation.
device
Normal The controller opens and closes the outdoor air damper
operation based on the controller occupancy mode and fan status.
Normally, the outdoor air damper is open during occupied
mode when the fan is running and closed during
unoccupied mode. (Refer to
Air Damper (UC400)," p.
Unit The controller must be properly configured based on the
configuration actual installed end devices and application. If the unit
configuration does not match the actual end device, the
outdoor air damper may not work correctly.
UV-SVN02C-EN
"Modulating Outdoor/Return
82.)

Troubleshooting (ECM)

WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by Trane
or others, refer to the appropriate manufacturer's
literature for allowable waiting periods for discharge of
capacitors. Verify with an appropriate voltmeter that all
capacitors have discharged. Failure to disconnect
power and discharge capacitors before servicing could
result in death or serious injury.
WARNING
Safety Alert!
You MUST follow all recommendations below. Failure
to do so could result in death or serious injury.
• The BLDC 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. Unplugging the motor is adequate to
ensure that there will be no power request.
• The adapter boards contain high voltage.
Configuration adjustments to the ECM engine board
should be made through the SMALLER of the two
low-voltage lids on the front of the control panel,
through the low-voltage insulation/shielding.
• Initial hookups to the CSTI and standard adapter
boards, 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.
Notes:
• The new Trane BLDC system is a closed loop system
that has equipment protections and envelope
enforcements. Do not assume that the motor has failed
without first consulting the ECM engine status/
diagnostics screen. In many cases, the engine shuts
down the motor operation and locks it out to prevent
equipment damage.
• Electric Heat operation and Changeover Coil control on
CSTI units are co-coordinated by the ECM engine
board. Changeover function on Tracer ZN units can
also be affected by incorrect configuration of the ECM
engine or improper wiring of terminals to analog
Diagnostics
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