System Wiring Diagrams; Connecting Thermostat Wiring; Supported Configurations - Lennox iComfort M30 Installation And Setup Manual

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
During heating
O terminal : OFF
B terminal : ON
During cooling
Heat/Cool
O terminal : ON
mode
B terminal : OFF
No Demand
The terminal continues the previous ON / OFF
state
The terminal state continues the state before en-
Off mode
tering off mode

System Wiring Diagrams

For system diagrams, see the included fold-out
iComfort M30 Smart Thermostat System Diagrams
®
sheet.

Connecting Thermostat Wiring

Use "Table 1. Terminal Designations" on page 7
for connecting the thermostat wiring to the back
plate terminals.
If this is a replacement thermostat, connect
to terminals as noted when removing the old
thermostat. If terminals were different on old
thermostat, use "Table 1. Terminal Designations" on
page 7 and wiring diagrams provided in the kit.
NOTE: Remember to seal the hole in the wall with
a suitable material to prevent drafts from
entering the thermostat case. Not doing
so could affect the thermostat's internal
temperature sensor.

Supported Configurations

See "Table 3. Supported Configurations" on page
9.
8