Terminal Connections; Purpose; Wiring Thermostat - (With Or Without Co ) - Lennox ComfortSense 8500 Installation And Setup Manual

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 require wiring as
specified in "Table 3. Twisted Pair Communication
Wiring (SysBus - Yellow)" on page 4.
Table 4. Twisted Pair Communication Wiring
(SysBus - Yellow)
Terminals

Purpose

10VDC to damper actuator
DO
Common to damper actuator
SG
Heat relay
HR
Fan relay
FR
Relay hot
RH
24VAC
R
External indoor temperature sensor
T
T (10KΏ or 11KΏ)
OC
Occupancy sensor
OC
Zone bus communications (L
CM-
CM+ Connection)
24VAC common
C
IMPORTANT!
Damage to the ComfortSense 8500 may occur if
24VAC polarity is not maintained.
Wiring CS8500 (with or without CO
Below are the terminal designations and a general
description of their purpose.
1. Connect wiring
applicable controller.
2. Connect external sensors if applicable.
3. Seal the hole in the wall with a suitable material
to prevent drafts from entering the CS8500
case.
4. Configure CS8500 and equipment for system
type and test system.
6
)
2
between CS8500 and