Installation Considerations; Outdoor Air Temperature Sensor Installation (Optional) - Lennox iComfort M30 Installation And Setup Manual

IMPORTANT
In all applications, the M30 thermostat can only
be used with all residential units and approved
commercial split-system matches, and those
which meet the following installation criteria:
Installation uses 18 gauge thermostat wire or
larger and wire run length DOES NOT EXCEED
300 feet (91 meters).
Load from any thermostat connection is 1 AMP
or less.
When using the outdoor sensor and connecting
to the To and Tc outdoor temperature terminal
connections we suggest using a separate 2-wire
thermostat wire cable to the sensor.
CAUTION
This is a 24VAC low-voltage thermostat. Do not
install on voltages higher than 30VAC.
Do not short (jumper) across terminals on the gas
valve or at the system control to test installation.
This will damage the thermostat and void the
warranty.

Installation Considerations

Before beginning installation, note the type of
equipment, number of stages, and any accessories
being installed. This thermostat is a 24VAC low-
voltage thermostat and requires a common wire to
the thermostat to operate.
• Shut off all power to system components before
installing thermostat.
• Make sure that all wiring conforms to local
and national building and electrical codes and
ordinances.
• Never short (jumper) across terminals on the gas
valve or at the system control to test installation.
This will damage the thermostat and void the
warranty.
• Never install thermostat on outside walls or in
direct sunlight.
Outdoor Air Temperature Sensor Installation
(Optional)
The optional outdoor air (temperature) sensor
(OATS) (X2658) wiring distance to iComfort M30
should not exceed 150 feet (45 meters) when
wired with minimum 22 #AWG (recommend 18
#AWG) dedicated 2-conductor thermostat cable.
Installation of OATS must comply with the following
requirements:
The sensor is required for:
• Outdoor temperature displays on the home
screen if enabled
• Balance point adjustment and control. The sensor
enables optimal heating equipment operation via
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