21
924.674.3 - GBINSTRUCTIONS PERTAINING TO THE INSTALLER
To clean the DHW system it is not necessary to remove the DHW heat exchanger if the assembly is equipped with the
appropriate 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 lters.
In case the appropriate tap is not supplied it is necessary to disassemble the DHW heat exchanger, as described in the fol-
lowing section, and do the purge aside. We recommend you also purge from limestone deposits the DHW heat exchanger
seat and the NTC sensor 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.
28.
HOW TO PURGE THE DHW SYSTEM FROM LIMESTONE DEPOSITS
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 (gure 19).
29. HOW TO DISASSEMBLE THE DHW HEAT EXCHANGER
The boiler is equipped with a cold water
lter placed on the hydraulic assembly.
To clean it do the following:
• drain the DHW system from water;
• unscrew the nut on the ow sensing
assembly (Figure 19);
• pull out the ow sensing device and
its lter;
• remove the impurities.
Important: in the event of replace-
ments and/or cleaning of the O-rings
on the hydraulic unit, do not use oil
or grease as lubricant but exclusively
Molykote 111.
30. CLEANING THE COLD WATER FILTER
0606_2703 / CG_1839
ow sensing securing nut
Figure 19
DHW heat exchanger securing screws
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