De Dietrich MS 24 BIC [81/292] Cleaning the filters

71.06199.02 - 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 15F). 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 15.

• remove the clip (1-F) from the lter as illustrated in the gure and take out the cartridge (2-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 15);

• 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.

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

To clean, proceed as follows:

• Turn off the DHW inlet tap

• Drain the DHW system by opening a hot water tap

• Turn off the DHW outlet tap

• Remove the clip 1E in gure 15.

• Remove the lter (2E gure 15).

Dismount the water-water heat exchanger, as described in the next section, and clean it separately.

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

31. REMOVING SCALE FROM THE DHW CIRCUIT

The stainless steel plate-type water-water heat exchanger can be easily disassembled with an M4 spanner by operating

as described below:

• drain the system, just the boiler if possible, through the drain tap;

• drain the DHW system;

• remove the two screws at the front securing the water-water heat exchanger and pull it out (gure 15B).

32. DISMOUNTING THE WATER-WATER HEAT EXCHANGER

DRAINING THE STORAGE BOILER

Drain the water in the storage boiler as follows:

- close the water inlet tap;

- open a user tap;

- open the relative drain tap (Fig. 2-B);

- loosen the nut on the DHW outlet pipe at the bottom of the storage boiler.