Viessmann Vitocal 242-S Installation And Service Instructions Manual page 73

Checking the sensors
Internal unit: Viessmann NTC 10 k
Outside temperature sensor
200
100
80
60
40
20
10
8
6
-20 -10 0
Temperature in °C
Fig. 61
Internal unit: Viessmann NTC 20 k
40
20
10
1
0.1
0 20 40
Temperature in °C
Fig. 63
(cont.)
(marked blue)
Ω
10 20 30
(marked orange)
Ω
60 80 100
Other sensors
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50
Temperature in °C
Fig. 62
120 140 160
Maintenance
70 90 110
180 200
73