89
Viessmann Pt500A (green identifica-
tion label)
460
20
540
100
Resistance in
Temperature in °C
60
140 180
620
700
780
860
-20
Temperature sensors in external unit (no marking)
Type NTC 10 kΩ
0.1
1
10
100
1000
Resistance in k
Ω
-30 -20 -10 0 10 20 30 40 50 60 70 80 90 100
Temperature in °C
Troubleshooting
Repairs
(cont.)
5782 176 GB
Service
