Thermostat Terminal Information - Lennox iComfort M30 Installation And Setup Manual

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Hermostat erminal
Table 1. Terminal Designations
Terminal Purpose
Used for connection to an optional outdoor tempera-
Tc and To
ture sensor.
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
ACC1 and
software setting to the applicable type of accessory.
ACC2
Power is supplied by R2 to ACC1 factory jumper.
NOTE: Do not remove the factory installed
jumper between ACC1 and R2 terminals
unless a secondary 24VAC power
source is connected to ACC1.
This is the secondary 24VAC power source for ACC
R2 (Accessory). The R2 terminal is connected to the
ACC1 terminal by factory provided jumper.
This terminal is for an optional dehumidifier or hu-
midifier.
Factory default software setting is for dehumidify.
Terminal settings can be changed by going to set-
tings > advanced settings > terminal settings.
D/H
Available settings are off, humidify and dehumidi-
fy.
NOTE: The user interface refers to the terminal
as H/D.
Second-stage heating (non-heat pump) or 4th stage
W2
(heat pump).
Y2 Second-stage heating or cooling.
i
nformation
Table 1. Terminal Designations
Terminal Purpose
Heat pump reversing valve operations. When O (de-
fault) is selected under settings > advanced set-
tings > terminal settings, the relay is ON during
O/B
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
First-stage heating (non-heat pump or emergency
W1
heat) or third-stage heating (heat pump)
Y1
First-stage heating or cooling
R
24VAC power
Table 2. O/B Terminal Relationship States
State O/B Terminal Control
O terminal : ON (If O terminal selected)
Power ON
B terminal : OFF (If B terminal selected
Heat only or
O terminal : always OFF
emergency
B terminal : always ON
heat mode
O terminal : always ON
Cool mode
only
B terminal : always OFF
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