Cleaning The Filters; Removing Scale From The Dhw Circuit; Dismounting The Water-Water Heat Exchanger - Baxi Fourtech Series Operating And Installation Instructions

The DHW filters and the filters 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 (figure 16F), the cartridge of the DHW circuit is on the cold water input
(figure 16E). To clean the filters, proceed as described below:
taking care not to apply excessive force;
IMPORTANT
when replacing and/or cleaning the O-rings on the hydraulic assembly, only use Molykote 111 as a lubricant, not oil or grease.

30. REMOVING SCALE FROM THE DHW CIRCUIT

The DHW circuit can be cleaned without removing the water-water heat exchanger if the assembly is fitted with the special
tap (available on request) located on the DHW outlet.
To clean, proceed as follows:
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 fitted on the DHW circuit (figure 16D).
To clean the exchanger and/or DHW circuit, use Cillit FFW-AL or Benckiser HF-AL.

31. DISMOUNTING THE WATER-WATER HEAT EXCHANGER

The stainless steel plate-type water-water heat exchanger is easily disassembled with a screwdriver by operating as
described below:
INSTRUCTIONS FOR FITTERS

29. CLEANING THE FILTERS

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