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3Störungssuche und -beseitigung
Serviceanleitung Logamax U112(K)/U114(K)/U122(K)/U124(K) • Ausgabe 12/2004 55
Änderungen aufgrund technischer Verbesserungen vorbehalten! W
3.1.22 Umwälzpumpe prüfen
z Verschlussschraube an der Umwälzpumpe
abschrauben.
z Netzschalter am UBA auf „I“ stellen.
z Prüfen, ob Umwälzpumpe läuft. Durch längere Still-
standszeit der Heizungsanlage kann die Umwälz-
pumpe mechanisch blockiert sein. Mit Hilfe eines
Schraubendrehers und Drehen in Laufrichtung der
Umwälzpumpe lässt sich diese Blockade lösen.
Führt dies zu keinem Erfolg, ist die Umwälzpumpe
defekt.
z Ist die Umwälzpumpe in Ordnung, Verschluss-
schraube einschrauben.
3.1.23 Umwälzpumpe tauschen
z Anlage vom Stromnetz trennen.
z Wartungshähne schließen.
z Logamax U122/U124 entsprechend „Montage- und
Wartungsanweisung“ entleeren.
z Schraube am Klemmenkasten der Umwälzpumpe
lösen und Klemmenkasten öffnen. Kabelzuordnung
notieren, Kabel lösen.
z Verschraubungen an der Umwälzpumpe lösen und
Pumpe herausnehmen.
z Neue Pumpe einsetzen und verschrauben.
z Kabel in der zuvor notierten Zuordnung im Klemmen-
kasten anklemmen, Klemmenkasten schließen und
verschrauben.
z Anlage ans Stromnetz schalten.
z Wartungshähne öffnen.
DHINWEIS!
Logamax U122/U124 entsprechend „Montage-
und Wartungsanweisung“ füllen und entlüften.
Abb. 65 Umwälzpumpe prüfen
Abb. 66 Logamax U112/122 (11 KW): Umwälzpumpe tau-
schen
55


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