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DEX 18 / 21 / 24 / 27 KW
22
Wartungsarbeiten dürfen nur von
einem anerkannten Fach
handwerks-
betrieb durchgeführt werden.
Reinigung und Wechsel des
Filtersiebes
Der Kaltwasseranschluss des Durchlauf-
erhitzers DEX ist mit einem integrierten
Absperrventil und Sieb ausgestattet.
Durch Verschmutzung des Siebes kann die
Warmwasserleistung vermindert werden,
so dass die Reinigung beziehungsweise
der Austausch des Siebes wie folgt vorzu-
nehmen ist:
1. Schalten Sie den Durchlauferhitzer an
den Haussicherungen spannungsfrei
und sichern Sie diese gegen unbeab-
sichtigtes Wiedereinschalten.
2. Nach Öffnen der Gerätehaube drehen
Sie das Absperr ventil (20 c) im Kalt-
wasseranschlussstück zu (Position II).
3. Drehen Sie die Verschlussschraube
(20b) aus dem Kaltwasser anschluss-
stück und nehmen Sie das Sieb (20 a)
herau s.
4. Das Sieb kann nun gereinigt bezie-
hungsweise ersetzt werden.
5. Nach Einbau des Siebes drehen Sie die
Verschlussschraube fest.
6. Drehen Sie das Absperrventil im
Kaltwasseranschlussstück langsam
auf (Position I).
7. Entlüften Sie das Gerät, indem Sie das
zugehörige Warmwasserzapfventil
mehrfach langsam öffnen und schlie-
ßen, bis keine Luft mehr aus der
Leitung austritt.
8. Setzen Sie die Gerätehaube auf.
Danach schalten Sie die Spannung an
den Haussicherungen wieder ein.
Maintenance work must only be con-
ducted by an authorised professional.
Cleaning and replacing the
filter strainer
The cold water connection of the instan-
taneous water heater DEX is equipped
with an integrated shut-off valve and a
strainer. Soiling of the strainer may reduce
the warm water output.
Clean or replace the strainer as follows:
1. De-energize the instantaneous water
heater by means of the house fuses
and prevent inadvertent reactivation
of them.
2. After opening the hood of the unit,
close the shut-off valve (20 c) in the
cold water connection piece (position
II).
3. Unscrew the screw plug (20 b) from
the cold water connection piece and
take out the strainer (20 a).
4. The strainer can now be cleaned or
re placed.
5. After fitting of the strainer tighten the
screw plug.
6. Slowly open the shut-off valve in the
cold water connection piece (posi-
tionI).
7. Vent the unit by carefully opening and
closing the affiliated warm water tap
valve several times until air no longer
emerges from the pipe.
8. Fit the hood of the unit. Then reconnect
the voltage to the house fuses.
13. Wartungsarbeiten 13. Maintenance work
(20 a)(20 b)
(20 c)
22


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