Operating instructions

138
Checking flow temperature sensor
Pressure drop curve
10
1
10 30 50 70 90 110
Temperature in °C
0.4
0.6
0.8
2
4
6
8
20
Resistance in kΩ
Sensor type: NTC 10 kΩ
1.
Remove plug ? (flow temperature
sensor).
2. Check the sensor resistance and
compare it with the curve.
Replace the sensor in the case of
severe deviation.
Checking the Vitotronic 200-H (accessory)
The Vitotronic 200-H is connected to the
control unit via the LON cable. To test the
connection, carry out a subscriber check
at the boiler control unit (see page 57).
Troubleshooting
Repairs
(cont.)
5772 909 GB