Trane VUV Installation, Operation And Maintenance Manual page 117

Replacement Checklist
NOTICE
Equipment Damage!
Failure to follow this instruction could result in
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.
 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.
Circuit Module Replacement
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.
Figure 90. Remove PCB
UV-SVX005G-EN
Depress latch to
remove PCB, leaving
standoff attached to
metal panel
Diagnostics and Troubleshooting
2. If replacing the VelociTach™ motor control board, 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 91, p. 117.
Figure 91. CSTI wiring
Adapter board
Attach green wire to
quick-connect terminal
Green wire
Attach green wire
to white plug
VelociTach
engine control
board
4. Ensure that the new VelociTach™ motor board controller is
configured to match the configuration label that is present
on the unit. It is necessary to configure the VelociTach™
board to avoid improper operation of the unit, discomfort to
the end user, and loud fan operation.
Figure 92. Configure VelociTach™ board
5. Ensure that the CSTI adapter board switches are set
correctly, as indicated in the unit schematic (where
applicable) shown in Figure 93, p. 118.
117