Terminal Connections; Purpose - Lennox ComfortSense 8500 Series Installation And Setup Manual

g. Route the CS8500 and outdoor tempera-
ture sensor (optional) wiring from wall
through center openings on wall plate (use
is optional) and back plate (see "Figure 3.
Route Wiring" on page 6).
Run thermostat wire
through openings
Figure 3. Route Wiring
h. Secure back plate and wall plate (option-
al) to wall with the two provided mounting
screws.
Screw
Figure 4. Secure Back Plate
NOTE: Remember to seal the hole in the wall with
a suitable material to prevent drafts from
entering the zone sensor case. Not doing
so could affect the internal temperature
and humidity sensors.
Wall Plate (optional)
Thermostat
Back Plate
Wall Plate (optional)
Thermostat
Back Plate

Terminal Connections

External sensors use standard thermostat wiring;
and may be wired using two wires of a multiple wire
cable. Wire run should not exceed 300 feet (100m).
Terminals CM- and CM+ will use wiring as refer-
enced in "Table 2. Twisted Pair Communication Wir-
ing (S-Bus - Yellow)" on page 4.
Table 3. Twisted Pair Communication Wiring
(S-Bus - Yellow)
Terminals

Purpose

24VAC
R
External indoor temperature sensor
T T
(10KΏ or 11KΏ )
Occupancy sensor
OC OC
S-Bus communication
CM- CM+
24VAC common
C
IMPORTANT!
Damage to the ComfortSense 8500 may occur if
24VAC polarity is not maintained.
6