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Diagnostics and Troubleshooting
UNT-SVX07J-EN
153
•
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
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.
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.
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.
5. Ensure that the CSTI adapter board switches are set
correctly, as indicated in the unit schematic (where
applicable) shown in
.
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.
Figure 112. Remove PCB
Figure 113. Configure VelociTach board
Depress latch to
remove PCB, leaving
standoff attached to
metal panel
Summary of Contents for UniTrane
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