Installation and Maintenance Manual

UNT-SVX07D-EN 129
Replacing ECM Components
Notes:
• Ensure that drip-loops are maintained on wiring on
pipe end of unit to avoid wicking of water into the unit.
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
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.
• Caution should be taken to stay clear of hazardous
voltages, moving parts and electric heat elements
while making adjustments to the ECM engine board.
If it is not practical to stay clear of these areas during
adjustment of the ECM engine board, please contact
Trane Global Parts for configuration kit that allows
easy powering of the engine board outside of the unit
with a 9V battery.
• For safe operation, it is necessary to configure
replacement boards to match the setup/switch
configuration of the previously installed boards.
• Ensure that new circuit modules are firmly seated on
the nylon standoffs, and that the nylon standoffs are
firmly seated on the metal panel.
NOTICE:
Equipment Damage!
The motor harness attached to the single plug to which
the motor mates contains the very important 115V
motor voltage jumper; the motor harness should
always be present for 115V units and should not be
modified or substituted. Failure to follow this
instruction could result in equipment damage.
UNT-SVX07_-EN.book Page 129 Friday, April 27, 2012 9:40 AM