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3Störungssuche und -beseitigung
Serviceanleitung Logamax U112(K)/U114(K)/U122(K)/U124(K) • Ausgabe 12/2004 57
Änderungen aufgrund technischer Verbesserungen vorbehalten! W
3.1.27 Heizwassersensor prüfen
z Steckverbindung am Kabel zum Heizwassersensor
auseinanderziehen.
z Widerstand messen, Temperatur am Thermo-Mano-
meter ablesen (Toleranz ± 5 K) und mit den Werten
in Tab. 3 vergleichen. Weichen die Werte stark ab,
ist der Heizwassersensor defekt.
z Wenn der Heizwassersensor in Ordnung ist, Steck-
verbindung wieder herstellen.
Abb. 70 Heizwassersensor prüfen
Tab. 3 Widerstandswerte des Vorlauf- und Heizwassersen-
sors (Richtwerte)
Temperatur [°C] Widerstand []
0 29490
5 23462
10 18787
15 15136
20 12268
25 10000
30 8197
35 6754
40 5594
45 4656
50 3893
55 3271
60 2760
65 2339
70 1990
75 1700
80 1458
85 1255
90 1084
95 939,6
100 817,2
57


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