Lennox iComfort M30 - System Modes and Schedules; Selecting Operating Modes; Away Mode Operation

7
Thermostat Terminal Information
Table 1. Terminal Designations
Terminal Purpose
Tc and To
Used for connection to an optional outdoor tem-
perature sensor. Use only dedicated 2-conductor
thermostat wire.
ACC1 and
ACC2
Default factory software setting for ACC (Accessory)
is off.
Terminal function setting can be changed by going to
settings > advanced settings > terminal settings.
Available settings are off, humidify and dehumidify.
Connect accessory to terminal ACC2 and change
software setting to the applicable type of accessory.
Power is supplied by R2 to ACC1 factory jumper.
NOTE: The ACC1 is intended to be the voltage
input terminal for the ACC relay. If
the ACC relay is congured as a
Dehumidier and Humidier, the ACC1
terminal needs to be jumpered to “R2”
to supply the 24VAC from the HVAC
system’s 24V source. A jumper between
R2 and ACC1 will be shipped installed
by the factory.
NOTE: If the ACC terminal is used for ventilator
devices which have their own voltage
supply and need a set of “dry relay
contacts” then the jumper will need to be
removed from R2-ACC1.
R2
This is the secondary 24VAC power source for ACC
(Accessory). The R2 terminal is connected to the
ACC1 terminal by factory provided jumper.
Table 1. Terminal Designations
Terminal Purpose
D/H
This terminal is for an optional dehumidier or hu-
midier.
The D/H terminal is powered using the HVAC sys-
tem’s 24VAC source (“R”).
Factory default software setting is for dehumidify.
Terminal settings can be changed by going to set-
tings > advanced settings > terminal settings.
Available settings are off, humidify and dehumidi-
fy.
NOTE: The user interface refers to the terminal
as H/D.
W2
Second-stage heating (non-heat pump) or 4th stage
(heat pump).
Y2 Second-stage heating or cooling.
O/B
Heat pump reversing valve operations. When O (de-
fault) is selected under settings > advanced set-
tings > terminal settings, the relay is ON during
cooling and OFF during heating.
When B is selected, the relay is ON during heating
and OFF during cooling.
C Common 24VAC
G Fan relay
W1
First-stage heating (non-heat pump or emergency
heat) or third-stage heating (heat pump)
Y1 First-stage heating or cooling
R 24VAC power