Operation Manual

81
71.06953.01 - 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.