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36 UNT-SVX07A-EN
electrical
requirementsInstallation
Unit Wiring Diagrams
Specific unit wiring diagrams 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 & recessed models and on the fan
and motor panel of vertical concealed &
all horizontal models.
Supply Power Wiring
WARNING
Hazardous Voltage w/Capacitors!
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. Failure to disconnect
power and discharge capacitors
before servicing could result in death
or serious injury.
Refer to the unit nameplate to obtain the
minimum circuit ampacity (MCA) and
maximum fuse size (MFS) or maximum
circuit breaker (MCB) 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 sche-
matic for specific wiring connections.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to
accept other type conductors. Failure
to use copper conductors may result
in equipment damage.
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 a disconnect
switch, the power leads and capped
ground wire are inside the control panel.
If the unit has a disconnect switch, the
power leads are wired to the junction box
switch on the control panel. Pull the
capped ground wire into the junction 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.
CAUTION
Equipment Damage!
Unit transformer IT1 provides power
to fan-coil unit only. Field connections
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.
Wall Mounted Control
Interconnection Wiring
The installer must provide interconnec-
tion wiring to connect wall mounted
devices such as a fan mode 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 Table I-ER-1 for the wire size
range and maximum wiring distance for
each device.
Recommendation: Do not bundle or run
interconnection wiring in parallel with or
in the same conduit with any high-voltage
wires (110V or greater). Exposure of
interconnection wiring to high voltage
wiring, inductive loads, or RF transmitters
may cause radio frequency interference
(RFI). In addition, improper separation
may cause electrical noise problems.
Therefore, use shielded wire (Beldon
83559/83562 or equivalent) in applica-
tions that require a high degree of noise
immunity. Connect the shield to the
chassis ground and tape at the other end.
Table I-ER-1. Maximum wiring distances for
low voltage controls, ft.
device wire size range
fan speed switch 14 - 22 AWG 500
zone sensor 16 - 22 AWG 200
Note: Do not connect any sensor or input
circuit to an external ground connection.