BAXI - 925.200.1
24
GB
HU
CZ
INSTRUCTIONS PERTAINING TO THE INSTALLER
925.492.2
28. HOW TO PURGE THE DHW SYSTEM FROM LIMESTONE DEPOSITS
To clean the DHW system it is not necessary to remove the DHW heat exchanger if the assembly is equipped with the ap-
propriate taps (supplied on demand) placed on the hot water outlet and inlet.
To carry out the purge it is necessary to:
• close the cold water inlet
• drain the DHW system from the water contained therein by means of a hot water tap
• close the DHW outlet
• unscrew the two stop cocks caps
• remove the fi lters.
In case the appropriate tap is not supplied it is necessary to disassemble the DHW heat exchanger, as described in the
following section, and do the purge aside. We recommend you also purge from limestone deposits the DHW heat ex-
changer
seat and the NTC sensor fi tted on the DHW system.
To purge the exchanger and/or the DHW system we suggest the use of Cillit FFW-AL or Beckinser HF-AL.
29. HOW TO DISASSEMBLE THE DHW HEAT EXCHANGER
The stainless steel plate-type DHW heat exchanger is easily disassembled with a screwdriver by operating as described
below:
• drain, if possible, only the boiler system,
through the drain tap;
• drain the DHW system from water;
• remove the two screws (right in front of you) securing the DHW heat exchanger and pull it off its seat (fi gure 23).
30. CLEANING THE COLD WATER FILTER
The boiler is equipped with a cold water fi lter placed on the hydraulic assembly. To clean it do the following:
• drain the DHW system from water;
• unscrew the nut on the fl ow sensing assembly (Figure 19);
• pull out the fl ow sensing device and its fi lter;
• remove the impurities.
Important:
in the event of replacements and/or cleaning of the O-rings on the hydraulic unit, do not use oil or grease as
lubricant but exclusively Molykote 111.
0605_3001 / CG_1825
DHW heat exchanger securing screws
flow sensing securing nut
Figure 19
