Checking the boiler water temperature sensor and the flue
gas temperature sensor
1.
Check the sensor resistance.
Boiler water temperature sensor
Resistance: NTC 5 k
Ω
Temperature
in °C
Pressure drop
in k
Ω
30
40
50
60
70
4.03
2.66
1.80
1.24
0.87
Flue gas temperature sensor
Resistance: PT 1000
Temperature
in °C
Pressure drop
in k
Ω
20
60
90
120
150
1.08
1.23
1.35
1.46
1.57
2.
Disconnect cores from the sensor,
if actual values deviate severely
from the curve, repeat sensor mea-
surements and compare with the
actual temperature (for scanning,
see operating instructions).
3.
Depending on the result, replace
the lead or the sensor.
Repairs
26
Troubleshooting
5692
618
GB
Summary of Contents for Vitolig 300
Page 27: ...Standard control Connection and wiring diagrams 27 Connection and wiring diagrams 5692 618 GB ...
Page 37: ...Parts list cont 37 Parts lists 5692 618 GB ...
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