69-1020—2
3
C7089B OUTDOOR SENSOR
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.
Fig. 4. Outdoor temperature display
on the thermostat.
CALIBRATION
The C7089B Outdoor Sensor is calibrated at the factory
and cannot be recalibrated at the field.
0
100
200
300
400
500
600
700
800
900
RESISTANCE (K ohm)
-40
(-40)
-20
(-29)
0
(-18)
20
(-7)
40
(4)
60
(16)
80
(27)
100
(38)
120
(49)
°
F
(
°
C)
OUTDOOR TEMPERATURE
M10172A
T8600
M13284
Outdoor
