Lennox ComfortSense 7500 Installation And Setup Manual page 12

Outdoor Sensor (small commercial split
systems only)
An outdoor temperature sensor (X2658) is
required for balance points and Humiditrol
operations.
Users has three options to select from (under
Installer Settings > sensor settings > outdoor
sensor):
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Option 1 is using a outdoor temperature
sensor (X2658) (default). Sensor connects
to To and Tc terminals on the thermostat.
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Option 2 is using a discharge air temperature
sensor (19L22). Connects to To and Tc
terminals on thermostat. This sensor is a
non-adjustable duct mount temperature
sensor.
NOTE: The discharge air sensor is for
monitoring and display only. There is no
control based on input from this sensor.
Indoor Sensors (remote temperature room
sensor)
This thermostat can support one to five remote
indoor temperature sensors. Users has three
options to select from under Installer Settings >
sensor settings > indoor sensor:
®
unit
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Option 1 is remote 10k (47W37)
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Option 2 is remote 20k (47W36)
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Option 3 is internal (default)
NOTE: Both external sensors are purchase
separately. Wiring examples for up to five sensors
are illustrated in figure 6 on page 13. All examples
shown result in Option 2, 20k setting.
For detail
procedure, refer to the instructions provided with
either kit. Thermostat terminals Ti and Tc are used
for indoor sensor(s).
NOTE - The outdoor sensor uses standard
thermostat wiring; it may be wired using two wires
of a multiple wire cable.
NOTE - Wire run should not exceed 300 feet
(100m).
12
installation requirements and