Filter
Top Products
VisionPRO
TM
8000 Touchscreen Programmable Thermostat
37 68-0280—01
C7189U Remote Indoor Temperature Sensor
Operation
When installed with Thermostat Installer Setup Number 0340
set to 3, the remote inside temperature is displayed on the
Thermostat Home Screen as Inside Temperature. The
thermostat internal temperature sensor is not used. See Fig.
36.
Fig. 36. Inside temperature reading on
TH8000 Series Thermostat.
The C7189 Wall Mount Temperature Sensor converts room
temperature to a resistance that the thermostat can interpret.
The C7189 has a negative temperature coefficient (NTC),
which means that resistance decreases as the temperature
increases. See Table 13.
The C7189 can be used to provide one remote sensor input
(see Fig. 28) or as a temperature averaging network with
multiple C7189 Sensors connected, as shown in Fig. 29.
Checkout
For best results, allow C7189 Wall Mount Temperature Sensor
to absorb the air moving through the room for a minimum of
twenty minutes before taking a resistance measurement.
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
C7189 wiring terminals. Use an ohmmeter to measure the
resistance across the sensor. Then verify the sensor accuracy
with the temperature/resistance in Table 13.
Calibration
The C7189 Wall Mount Temperature Sensor is calibrated at
the factory and cannot 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
In
s
i
de
Se
t T
o
M19974
Table 13. Sensor Resistance at Room Temperature.
Room
Temperature
Ohms
of
Resis-
tance
Room
Temperature
Ohms
of
Resis-
tance°F °C °F °C
40 4.4 22537 72 22.2 11100
42 5.6 21516 74 23.3 10644
44 6.7 20546 76 24.4 10210
46 7.8 19626 78 25.6 9795
48 8.9 18754 80 26.7 9398
50 10.0 17926 82 27.8 9020
52 11.1 17136 84 28.9 8659
54 12.2 16387 86 30.0 8315
56 13.3 15675 88 31.1 7986
58 14.4 14999 90 32.2 7672
60 15.6 14356 92 33.3 7372
62 16.7 13743 94 34.4 7086
64 17.8 13161 96 35.6 6813
66 18.9 12607 98 36.7 6551
68 20.0 12081 100 37.8 6301
70 21.1 11578 —