90
71.03982.03 - EN
INSTALLATION INSTRUCTIONS
The DHW and CH ilters are housed in special extractable cartridges. The CH cartridge is located on the CH return line
(igure 16F) while the DHW cartridge is on the cold water input (igure 16E). To clean the ilters, 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 igure 16.
• remove the clip (1-E/F) from the ilter as illustrated in the igure and take out the cartridge (2-E/F) containing the ilter,
taking care not to apply excessive force;
• to extract the heating ilter cartridge, irst remove the 3-way valve motor (1-2G - igure 16);
• eliminate any impurities and deposits from the ilter;
• reposition the ilter in the cartridge and put it back into its housing, securing it with the clip.
• to change the DHW NTC sensor, see igure 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 itted 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 igure 16;
• Remove the ilter (2E igure 16);
• to change the DHW NTC sensor, see igure 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 itted on the DHW circuit (igure 16D).
To clean the exchanger and/or DHW circuit, use Cillit FFW-AL or Benckiser HF-AL.
31. REMOVING SCALE FROM THE DHW CIRCUIT
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