Replacing Ecm Components; Replacement Guidelines; Replacement Checklist - Trane UniTrane Fan Coil Installation, Operation And Maintenance Manual

Replacing ECM Components

WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious injury.
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. Verify with an appropriate
voltmeter that all capacitors have discharged.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN

Replacement Guidelines

• ECM motors contain capacitors which store residual
energy. Please keep clear of the fan wheels for
five 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 VelociTach motor
control 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 VelociTach motor
control board. If it is not practical to stay clear of these
areas during adjustment, 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
• Ensure that drip-loops are maintained on wiring on
pipe end of unit to avoid wicking of water into the unit.
• Before assuming that any of the boards or components
in the new system have failed, please ensure that the
VelociTach motor control board has been configured
UNT-SVX07E-EN
correctly and that the switches on the CSTI board
(where applicable) are set correctly.
• It is necessary to configure the service replacement
VelociTach motor control board before commissioning
the unit. The board is pre-configured with safe values,
but will NOT work correctly unless properly
configured.
• Only genuine Trane replacement components with
identical Trane part numbers should be used.
• Unit fan assemblies contain concealed wires that
should be removed before the fan-board is removed,
to avoid nicking the wire.
• Care should be maintained to retain the order of the
motors with respect to the motor plugs. On a unit with
two motors, the double-shafted motor will always be
to the left side, and will be designated as Motor 2 by the
controller.

Replacement Checklist

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.
 Ensure that motor nameplate voltage is the same as
unit voltage (for 3-phase/ 4-wire units with Neutral,
motor voltage will be L-N, not L1-L2).
 Ensure that motor harness is correct (harness will have
jumper installed for 115V units only).
 Ensure that configuration on the VelociTach motor
control board matches the affixed label.
 Maintain correct plug/motor association. The plugs
will have the motor number and shaft configuration
printed on an affixed label.
 Ensure that configuration of switches on CSTI adapter
board matches depiction of switches on the unit
schematic.
 Ensure that all wires are plugged in securely.
 Ensure that edge protection on sharp edges,
grommets, and wire management devices are
maintained when replacing components.
 Ensure that blunt-tip screws are used when in the
proximity of wire harnesses.
ECM Motors
151