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C7089 OUTDOOR SENSOR
3 69-1709EFS
OPERATION
Once installed and the Thermostat Installer Setup
Number 0340 is set to 1 or 2, the outside temperature
can be displayed on the thermostat. See Fig. 3.
Fig. 3. Outside temperature reading on
TH8000 Series Thermostat.
The C7089 Outdoor Sensor converts outdoor ambient
temperature to a resistance that the thermostat can
interpret.
The C7089 has a negative temperature coefficient (TC), which
means that resistance decreases as
the temperature increases. See Table 1.
CHECKOUT
Allow C7089B Outdoor Sensor to absorb outdoor air for a
minimum of twenty 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.
To verify sensor resistance, remove one wire from one of
the C7089 60-in. leadwires. Use an ohmmeter to
measure the resistance across the sensor. Then verify
the sensor accuracy with the temperature/resistance in
Table 1.
CALIBRATION
The C7089 Outdoor Sensor is calibrated at the factory and can-
not be recalibrated in the field.
Heat
On
SCHED HOLD CLOCK SCREEN MORE
MON
T
UE
WED
THU
FRI
SA
T
A
A
T
SUN
AM
FAN
A
U
T
O
SYSTEM
HEAT
Following
Schedule
Outside
Se
t T
o
M19971
Table 1. Sensor Resistance
at Outdoor Temperature .
Outdoor Temperature
Ohms of
Resistance°F °C
-20 -28.9 106926
-18 -27.8 100923
-16 -26.7 95310
-14 -25.6 90058
-12 -24.4 85124
-10 -23.3 80485
-8 -22.2 76137
-6 -21.1 72060
-4 -20.0 68237
-2 -18.9 64631
0 -17.8 61246
2 -16.7 58066
4 -15.6 55077
6 -14.4 53358
8 -13.3 49598