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926.323.1 - GB
INSTRUCTIONS FOR FITTERS
The DHW lters and the lters of the heating circuit are housed in special extractable cartridges. The cartridge of the he-
ating circuit is located on the return of the heating (gure 16F), the cartridge of the DHW circuit is on the cold water input
(gure 16E). To clean the lters, proceed as described below:
• turn off the electric power supply to the boiler;
• turn off the DHW inlet tap
• drain the water out of the heating circuit, turning on 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 cartridge of the heating lter you must rst remove the motor of the 3-way valve (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.
IMPORTANT
when replacing and/or cleaning the O-rings on the hydraulic assembly, only use Molykote 111 as a lubricant, not oil or
grease.
29. 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:
• 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 16
• Remove the lter (2E g 16).
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.
30. REMOVING SCALE FROM THE DHW CIRCUIT
The stainless steel plate-type water-water heat exchanger is easily disassembled with a screwdriver 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 16B).
31. DISMOUNTING THE WATER-WATER HEAT EXCHANGER
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