De Dietrich MS 24 [90/332] Cleaning the filters

71.03982.03 - EN

INSTALLATION INSTRUCTIONS

The DHW and CH lters are housed in special extractable cartridges. The CH cartridge is located on the CH return line

(gure 16F) while the DHW cartridge is on the cold water input (gure 16E). To clean the lters, proceed as described below:

• switch off the boiler;

• shut the DHW inlet tap

• drain the water in the CH circuit by opening tap A in gure 16.

• remove the clip (1-E/F) from the lter as illustrated in the gure and take out the cartridge (2-E/F) containing the lter,

taking care not to apply excessive force;

• to extract the heating lter cartridge, rst remove the 3-way valve motor (1-2G - gure 16);

• eliminate any impurities and deposits from the lter;

• reposition the lter in the cartridge and put it back into its housing, securing it with the clip.

• to change the DHW NTC sensor, see gure 16D.

WARNING

when replacing and/or cleaning the O-rings on the hydraulic assembly, only use Molykote 111 as a lubricant, not oil or grease.

30. CLEANING THE FILTERS

The DHW circuit can be cleaned without removing the water-water heat exchanger if the assembly is tted with the special

tap (available on request) located on the DHW outlet. To clean, proceed as follows:

• Close the DHW inlet tap;

• Drain the DHW system by opening a hot water tap;

• Close the DHW outlet tap;

• Remove the clip 1E in gure 16;

• Remove the lter (2E gure 16);

• to change the DHW NTC sensor, see gure 16D.

If the special tap is not supplied, dismount the water-water heat exchanger, as described in the next section, and clean it

separately. Remove the scale from the seat and relative NTC sensor tted on the DHW circuit (gure 16D).

To clean the exchanger and/or DHW circuit, use Cillit FFW-AL or Benckiser HF-AL.

31. REMOVING SCALE FROM THE DHW CIRCUIT