Honeywell TH8320 Benutzerhandbuch
VisionPRO
TM
8000 Touchscreen Programmable Thermostat
68-0280—01
36
C7089U Outdoor Temperature Sensor
Operation
When installed with Thermostat Installer Setup Number 0340
set to 1 or 2, the outside temperature can be displayed on the
thermostat. See Fig. 35.
Fig. 35. 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 12.
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
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 12.
Calibration
The C7089 Outdoor Sensor is calibrated at the factory and
cannot be recalibrated in the field.
SCHED
HOLD
CLOCK SCREEN
MORE
MON
TUE
WED
THU
FRI
SAT
AAT
SUN
AM
FAN
AUTO
SYSTEM
HEAT
Following
Schedule
Inside
Outside
Set To
M22453
Table 12. Sensor Resistance at Outdoor Temperature.
Outdoor
Temperature
Ohms of
Resis-
tance
Outdoor
Temperature
Ohms of
Resis-
tance
°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
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