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VISIONPRO
®
IAQ TOTAL HOME COMFORT SYSTEM
68-0287—04 34
C7089U1006 Outdoor Temperature Sensor
Operation
When installed with Thermostat Installer Setup Number 0342
set to 1, the outside temperature can be displayed on the
thermostat. See Fig. 34.
Fig. 34. Outside temperature reading on
VisionPRO
®
IAQ Thermostat.
The C7089U1006 Outdoor Sensor converts outdoor ambient
temperature to a resistance that the thermostat can interpret.
The C7089U1006 has a negative temperature coefficient
(NTC), which means that resistance decreases as the
temperature increases. See Table 12.
Checkout
Allow C7089U1006 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
C7089U1006 60-in. leadwires. Use an ohmmeter to measure
the resistance across the sensor. Then verify the sensor
accuracy with the temperature/resistance in Table 12.
Calibration
The C7089U1006 Outdoor Sensor is calibrated at the factory
and cannot be recalibrated in the field.
C7189U1005 Remote Indoor Temperature
Sensor
Operation
When installed with Thermostat Installer Setup Number 0340
set to 1, the remote inside temperature is displayed on the
thermostat home screen as Inside Temperature. The
thermostat internal temperature sensor is not used. When
SCHEDSCHED HOLDHOLD CLOCK SCREEN
DONE
WAKE
LEAVE RETURN SLEEP CANCEL
MON
TUE WED THU FRI SA SUN
Inside
M23679
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
In
s
i
de
Outside
Se
t T
o
M22453
Table 12. Sensor Resistance at
Outdoor Temperature.
Outdoor
Temperature
Ohms of
Resistance
Outdoor
Temperature
Ohms of
Resistance°F °C °F °C
-20 -28.9 106926 52 11.1 17136
-18 -27.8 100923 54 12.2 16387
-16 -26.7 95310 56 13.3 15675
-14 -25.6 90058 58 14.4 14999
-12 -24.4 85124 60 15.6 14356
-10 -23.3 80485 62 16.7 13743
-8 -22.2 76137 64 17.8 13161
-6 -21.1 72060 66 18.9 12607
-4 -20.0 68237 68 20.0 12081
-2 -18.9 64631 70 21.1 11578
0 -17.8 61246 72 22.2 11100
2 -16.7 58066 74 23.3 10644
4 -15.6 55077 76 24.4 10210
6 -14.4 53358 78 25.6 9795
8 -13.3 49598 80 26.7 9398
10 -12.2 47092 82 27.8 9020
12 -11.1 44732 84 28.9 8659
14 -10.0 42506 86 30.0 8315
16 -8.9 40394 88 31.1 7986
18 -7.8 38400 90 32.2 7672
20 -6.7 36519 92 33.3 7372
22 -5.6 34743 94 34.4 7086
24 -4.4 33063 96 35.6 6813
26 -3.3 31475 98 36.7 6551
28 -2.2 29975 100 37.8 6301
30 -1.1 28558 102 38.9 6062
32 0.0 27219 104 40.0 5834
34 1.1 25949 106 41.1 5614
36 2.2 24749 108 42.2 5404
38 3.3 23613 110 43.3 5203
40 4.4 22537 112 44.4 5010
42 5.6 21516 114 45.6 4826
44 6.7 20546 116 46.7 4649
46 7.8 19626 118 47.8 4479
48 8.9 18754 120 48.9 4317
50 10.0 17926 —