Honeywell Home C7089U Mode D'emploi page 3

OPERATION
Make sure to configure the thermostat or compatible
device for a 10K Ohm wired outdoor sensor. Installer
setup options vary according to thermostat/device
model.
The C7089U Outdoor Sensor converts outdoor
ambient temperature to a resistance that the
thermostat can interpret.
The C7089U has a negative temperature coefficient
(TC), which means that resistance decreases as the
temperature increases. See Table 1.
CHECKOUT
Allow C7089U 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 C7089U 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 C7089U Outdoor Sensor is calibrated at the
factory and cannot be recalibrated in the field.
Table 1. Sensor Resistance
at Outdoor Temperature .
Outdoor Temperature
°F
-40
-38.2
-36.4
-34.6
-32.8
-31
-29.2
-27.4
-25.6
-23.8
-22
-20
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
3
C7089U OUTDOOR SENSOR
Ohms of
°C Resistance
-40 195652
-39 184917
-38 174845
-37 165391
-36 156512
-35 148171
-34 140330
-33 132957
-32 126021
-31 119493
-30 113347
-28.9 106926
-27.8 100923
-26.7 95310
-25.6 90058
-24.4 85124
-23.3 80485
-22.2 76137
-21.1 72060
-20.0 68237
-18.9 64631
-17.8 61246
-16.7 58066
-15.6 55077
-14.4 53358
-13.3 49598
-12.2 47092
-11.1 44732
-10.0 42506
-8.9 40394
-7.8 38400
-6.7 36519
-5.6 34743
-4.4 33063
-3.3 31475
-2.2 29975
-1.1 28558
0.0 27219
1.1 25949
2.2 24749
3.3 23613
4.4 22537
5.6 21516
69-1709EFS—05