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900
800
700
600
500
400
300
200
100
0
0
°F
-40
-20
(-29)
(-18)
(°C)
(-40)
Fig. 3. C7089B sensor resistance vs. temperature
performance characteristics.
CHECKOUT
Allow the C7089B Outdoor Sensor to soak in the outdoor air
for a minimum of five minutes before taking a reading.
With an accurate thermometer (±1°F [0.5°C]) measure the
temperature at the sensor location, allowing time for the
thermometer to stabilize before reading. Press the
Information key on the thermostat until the display shows
Outdoor followed by the temperature reading. See Fig. 4. The
reading should match the reading taken outdoors.
To verify the resistance of the sensor, remove one wire from
one of the C7089B wiring terminals. Use an ohmmeter to
measure the resistance across the sensor. Then verify sensor
accuracy with the temperature/resistance curve of Fig. 3.
60
20
40
80
(-7)
(16)
(27)
(4)
OUTDOOR TEMPERATURE
100
120
(49)
(38)
M10172A
CALIBRATION
The C7089B Outdoor Sensor is calibrated at the factory
and cannot be recalibrated at the field.
3
C7089B OUTDOOR SENSOR
T8600
Fig. 4. Outdoor temperature display
on the thermostat.
M13284
69-1020—2
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