16
18-BC105D1-1D-EN
Electrical – Low Voltage Communicating
Table 20. Low Voltage Maximum Wire Length
Table 20, p. 16 defines the size and combined total maximum length of
low voltage wiring from the outdoor unit, to the indoor unit, and to the
thermostat.
Note: The use of color coded low voltage wire is recommended to
simplify connections between the outdoor unit, the control, and
the indoor unit.
Note: The maximum total cable length for the entire comfort control
communicating system is 500 ft. 18 AWG.
CONTROL WIRING
WIRE SIZE MAX. WIRE LENGTH
18 AWG 500 Ft. Combined
Table 21. Low Voltage Hook-up Diagrams in Link mode
Figure 1. Fully Communicating System
Neatly bundle all low
voltage wires as shown.
White
Green
Blue
Red
Communicating Outdoor Unit
Only used
for Load Shed,
Link SmartCharge
TM
and
to disable indoor heat during
auxiliary power operation
(Cap off if not used)
The Brown data wire used in clii mode is NOT
used in Link mode (Cap off if not used)
R
DH
DL
B
R
DH
DL
B
R
DH
DL
B
R
DH
DL
B
UX360
Smart Thermostat
SC360
System Controller
Distribution
Board
Indoor
Unit
1. In communicating mode, unused terminals are non-functional. Do not use.
2. Terminals present will vary by indoor model.
3. “D” is the data line. Installer to select a wire color.
Note: Anti-oxidizing grease is supplied in the documentation package for use when making low voltage field wiring connections at the outdoor
unit. Apply grease to field wiring before installing wire caps to protect these connections from corrosion.
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