Installation and Maintenance Manual

Replacing ECM Components
130 UNT-SVX07D-EN
• Before assuming that any of the boards or components
in the new system have failed, please ensure that the
ECM engine board has been configured correctly and
that the switches on the CSTI board (where applicable)
are set correctly.
• It is necessary to configure the service replacement
ECM engine board before commissioning the unit. The
ECM engine 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.
Tips:
• 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 ECM Engine 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.
Circuit Modules Replacement Notes/Work
Instructions
1. Circuit modules are equipped with nylon standoffs
which can either be removed by squeezing the barbs at
the rear of the control panel, or squeezing the latch
above the circuit module. If the latter method is chosen,
the standoffs will be retained on the metal panel. The
new standoffs (affixed to the replacement modules)
can be removed if necessary, so the new module circuit
board can be attached to the retained standoffs.
2. If replacing the ECM engine module, special care
should be taken to avoid electro-static discharge
damage. Please use an ESD protection wrist-strap and
frequently touch a grounded surface (with unit power
off) to discharge any static buildup.
3. Replace connectors carefully onto
the appropriate
board. For units with a green wire attached to the CSTI
or standard adapter boards, please ensure that the
green wire is attached to the engine board white
connector as shown in Figure 45.
4. Ensure that the new ECM engine controller is
configured to match the ECM engine configuration
label that is present on the unit. It is necessary to
configure the ECM engine board to avoid improper
operation of the unit, discomfort to the end user, and
loud fan operation.
Figure 44.
Figure 45.
Depress latch to
remove PCB, leaving
standoff attached to
the metal panel.
Green wire attached to
white plug on blue ECM
engine board, and to
quick-connect terminal
on the adapter board.
UNT-SVX07_-EN.book Page 130 Friday, April 27, 2012 9:40 AM