Installation - Electrical; Unit Wiring Diagrams; Supply Power Wiring; Electrical Grounding Restrictions - Trane UniTrane Installation, Operation And Maintenance Manual

Installation - Electrical

Note: Any modifications, additions or changes to the
control box could void the factory warranty and UL
certification. Such modification, additions or
changes will become the responsibly of the
modifying contractor.

Unit Wiring Diagrams

Specific unit wiring diagrams, based on unit options
ordered, are provided inside each unit and can be easily
removed for reference. Use these diagrams for
connections or trouble analysis. Wiring diagrams are
attached on the inside of the front panel of vertical cabinet
and recessed models and on the fan and motor panel of
vertical concealed and all horizontal models. For typical
wiring information, see the Wiring Diagrams chapter.
Note: Any modifications, additions or changes to the
control box could void the factory warranty and UL
certification. Such modification, additions or
changes will become the responsibly of the
modifying contractor.

Supply Power Wiring

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. 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.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
Refer to the unit nameplate to obtain the minimum circuit
ampacity (MCA) and maximum overcurrent protection
(MOP) to properly size field supply wiring and fuses or
circuit breakers.
Refer to the unit operating voltage listed on the unit wiring
schematic, submittal, or nameplate. Reference the wiring
schematic for specific wiring connections.
NOTICE:
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as unit terminals are not designed
to accept other types of conductors.
60
Note: All field wiring should conform to NEC and all
applicable state and local code requirements. The
control panel box is always on the end opposite the
piping connections. Access the control box by
removing the two screws that secure the front
cover. This will allow the panel to be removed, to
provide access to the electrical components.
WARNING
Hazardous Electrical Shorts!
Insulate all power wire from sheet metal ground.
Failure to do so may cause electrical shorts that could
result in death or serious injury.
If the unit does not have electric heat, the power leads and
capped ground wire are inside the junction box directly
beneath the control panel.
If the unit has electric heat, the power leads are in the
electric heat control box directly beneath the control panel.
Lowboy power leads are in the compartment to the side of
the control box.

Electrical Grounding Restrictions

All sensor and input circuits are normally at or near ground
(common) potential. When wiring sensors and other input
devices to the Tracer® controller, avoid creating ground
loops with grounded conductors external to the unit
control circuit. Ground loops can affect the measurement
accuracy of the controller.
NOTICE:
Equipment Damage!
Unit transformer IT1 provides power to fan-coil unit
only. Field connections directly to the transformer IT1
may create immediate or premature unit component
failure.
All input/output circuits (except isolated relay contacts and
optically isolated inputs) assume a grounded source,
either a ground wire at the supply transformer to control
panel chassis, or an installer supplied ground.

Interconnection Wiring

The installer must provide interconnection wiring to
connect wall-mounted devices such as a fan control switch
or zone sensor module.
Refer to the unit wiring schematic for specific wiring
details and point-to-point wiring connections. Dashed
lines indicate field wiring on the unit wiring schematics. All
interconnection wiring must conform to NEC Class 2
wiring requirements and any state and local requirements.
Refer to the table below for the wire size range and
maximum wiring distance for each device.
UNT-SVX07J-EN