CLCH-SVX009J-EN
51
Electrical Requirements
Unit Wiring Diagrams
Specific unit wiring diagrams are provided on the inside of
the control panel door. Use these diagrams for
connections or trouble analysis.
Supply Power Wiring
It is the installer’s responsibility to provide power supply
wiring to the unit. Wiring should conform to NEC and all
applicable code requirements. When units are ordered
without controls, the contractor must also furnish an on/
off switch, thermostat, and a fused disconnect switch in
compliance with national and local electrical codes.
For indoor units, bring supply wiring through the knockout
in the unit control box. Connect the three phase wires to
the power terminal block or the non-fused disconnect
switch in the control box terminals. Refer to specific wiring
diagrams and fuse information in the unit’s control panel.
For outdoor units, bring supply wiring through cutout in
the unit base in the unit control box or electric heat control
box. For return fan units without single point power, also
bring supply wiring through cut out in the unit base next
to the return fan. To access cutouts, remove cover plate on
base to expose conduit holes in the unit base.
For the electric heat or unit control box, connect the three
phase wire to the power terminal block.
For the return fan, connect the three phase wires to the
auxiliary junction box attached to the return fan.
For outdoor units, unit disconnect is not provided.
Refer to unit specific wiring diagrams for specific wiring
connections. Locate unit wiring diagrams on the inside of
the control box cover. Refer to the unit nameplate for unit
specific electrical information, such as voltage, minimum
circuit ampacity (MCA), and maximum fuse size (MFS).
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 control interface or controller, avoid
creating ground loops with grounded conductors external
to the unit control circuit. Ground loops can affect the
measurement accuracy of the controller.
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.
Note:
Do not connect any sensor or input circuit to an
external ground connection.
The installer must provide interconnection wiring to
connect wall mounted devices such as a 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
for the wire size range and
maximum wiring distance for each device.
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
Figure 56.
Conduit cover plate
VFD
VFD
Control
box
Control
box
Conduit
floor openings
Cover plate
removed
Conduit
cover plate
NOTICE
Use Copper Conductors Only!
Failure to use copper conductors could result in
equipment damage as equipment is not designed or
qualified to accept other types of conductors.
NOTICE
Motor Winding Damage!
Voltage sparkover could cause damage to the motor
windings. Do not use a megohm meter or apply voltage
greater than 50 Vdc to a compressor motor winding
while it is under a deep vacuum.
Table 10. Zone sensor maximum wiring distance
Wire Size Range
Max. Wiring Distance
16-12 AWG
200 ft
