Optional Remote Outdoor Sensor - Lennox ComfortSense L7742U Programming And Application Manual

Optional Remote Outdoor Sensor

The outdoor sensor (X2658) may be required, especially when using
Humiditrol® EDA applications. In addition to measuring and displaying
outdoor temperature, the outdoor sensor provides dew point adjust-
ment and control for all models. If used with this thermostat, the sensor
enables optimal heating equipment operation via programmable bal-
ance points. The screen will display NO OUTDOOR SENSOR until the
outdoor sensor is installed, the feature is turned on in the USER SET-
TINGS, in the DISPLAY INFO option. The outdoor temperature is dis-
played in the information display (lower center of the screen).
NOTE − For proper operation of Humiditrol
door sensor MUST be installed.
In many applications, the ComfortSense
displays the temperature sensed by the remote outdoor sensor. With
506228−01 05/09
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EDA applications, the out-
®
Model L7742U thermostat
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the heat pump system, the remote outdoor sensor helps determine
when to turn on the second stage of heating for optimal comfort.
When the outdoor sensor is connected, the temperature displays in the
information display area (below the indoor temperature display).
Installing Remote Outdoor Sensor
Install the remote outdoor sensor on a northern wall of the home, away
from direct sunlight or other heat sources that may affect its sensitivity.
IMPORTANT
The outdoor sensor must be connected to operate a system
®
with a Humiditrol accessory.