Lennox XC20-036-230-01 Installation And Service Procedure page 25

3
ROUTE CONTROL WIRES
Maximum length of wiring (18 gauge) for all connections on the RSBus is 1500 feet (457 meters). Wires should be color-coded, with
a temperature rating of 95
field-provided field-installed grommet installed in electrical inlet.
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The iComfort Wi-Fi or iComfort
®
iComfort control and four wires between the outdoor unit and the furnace/air handler iComfort
with more than four wires is used, the extra wires must be properly connected to avoid electrical noise (see below).
Use a wire nut to bundle the four unused wires at each end of the cable. Each bundle should also include an additional wire that should
be connected on each end to the C terminal as shown in the figure below.
PROVIDED RAST
6-PIN CONNECTOR
4
ROUTE HIGH VOLTAGE AND GROUND WIRES
Any excess high voltage field wiring should be trimmed and secured away from any low voltage field wiring. To facilitate a conduit, a
cutout is located on the bottom of the control box. Connect conduit to the control box using a proper conduit fitting.
º º
F (35 C) minimum, and solid-core (Class II Rated Wiring). All low voltage wiring must enter unit through
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S30 thermostats require four thermostat wires between the thermostat and the furnace / air handler
CONNECTS TO
RAST 6-PIN
CONNECTOR
ROUTE CONTROL
WIRING THROUGH
GROMMET AND
SECURE WITH
CABLE TIE
Single Wire To
C Terminal
Unused Wires
Figure 13. Electrical Installation (Continued)
OUTDOOR UNIT
GROMMET AND
CABLE TIE.
INDOOR CONTROL
Indoor Control
Single Wire To C Terminal
25
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control. When a thermostat cable
CONNECT CONDUIT
TO CUTOUT AND
ROUTE HIGH
VOLTAGE WIRING
USE WATERTIGHT
CONDUIT FOR HIGH
VOLTAGE
Unused Wires
XC20