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7105764.02 (1-11/12)
17. ANNUAL SERVICING
If the boiler was operating, wait for the combustion chamber and pipes to cool down.
Before commencing any maintenance operations, make sure the boiler is disconnected from the power supply. After servicing,
reset the original operating parameters of the boiler if they were changed.
Do not clean the boiler with abrasive, aggressive and/or easily flammable substances (such as petrol, acetone, etc.).
To optimise boiler efficiency, carry out the following annual controls:
• Check the appearance and airtightness of the gaskets of the gas and combustion circuits;
• Check the state and correct position of the ignition and flame-sensing electrodes;
• Check the state of the burner and make sure it is firmly fixed;
• Check for any impurities inside the combustion chamber. Use a vacuum cleaner to do this;
• Check the pressure of the heating system;
• Check the pressure of the expansion vessel;
• Check the fan works correctly;
• Make sure the flue and air ducts are unobstructed;
• Check for any impurities inside the siphon (for condensation boilers);
• Check the magnesium anode, where present, for boilers fitted with storage boilers.
17.1 HYDRAULIC UNIT
For special areas, where the water is harder than
20 °F
(1 °F = 10 mg calcium carbonate per litre of water), install a polyphosphate
dispenser or an equivalent treatment system, compliant with current regulations.
LEGEND -
“SECTION” F
17.2 CLEANING THE FILTERS
The DHW and CH filters are housed inside removable cartridges (see figure in annex “SECTION” F at the end of this manual).
The CH cartridge is located on the CH return line (F) while the DHW cartridge is on the cold water inlet (E). To clean the filters,
proceed as described below:
• switch off the boiler;
• shut the DHW inlet valve;
• drain the water in the CH circuit by opening valve (A);
• remove the clip (1-E/F) from the filter as illustrated in the figure and take out the cartridge (2-E/F) containing the filter, taking
care not to apply excessive force;
• to extract the heating filter cartridge, first remove the 3-way valve motor (1-2G);
• eliminate any impurities and deposits from the filter;
• reposition the filter in the cartridge and put it back into its housing, securing it with the clip.
•
The NTC DHW sensor is positioned in point (D).
when replacing and/or cleaning the O-rings on the hydraulic assembly, only use Molykote 111 as a lubricant, not oil or gre
-
ase.
17.3 REMOVING SCALE FROM THE D.H.W. CIRCUIT
The DHW circuit can be cleaned without removing the water-water exchanger from its housing if the plate was initially provided
with the specific tap (available on request) located on the DHW outlet (see figure in annex “SECTION” F at the end of this manual).
To clean, proceed as follows:
• Close the DHW inlet valve;
• Drain the DHW system by opening a hot water tap;
• Close the DHW outlet tap;
• Remove the clip (1E);
• Remove the filter (2E);
•
to replace the DHW NTC probe (D).
If the special tap is not supplied, dismount the water-water heat exchanger, as described in the next section, and clean it separa
-
tely. Remove the scale from the seat and relative NTC sensor fitted on the DHW circuit (D). To clean the exchanger and/or DHW
circuit, use Cillit FFW-AL or Benckiser HF-AL.
Summary of Contents for STAR CONDENS
Page 66: ...7105764 02 1 11 12 66 S E C T I O N A ...
Page 68: ...7105764 02 1 11 12 68 S E C T I O N B STAR CONDENS 24 28 33 ...
Page 70: ...7105764 02 1 11 12 70 S E C T I O N B STAR CONDENS 1 12 1 24 ...
Page 72: ...7105764 02 1 11 12 72 S E C T I O N C ...
Page 73: ...73 S E C T I O N C 7105764 02 1 11 12 ...
Page 74: ...7105764 02 1 11 12 74 S E C T I O N D 25 mm ...
Page 76: ...7105764 02 1 11 12 76 S E C T I O N E ...
Page 77: ...77 S E C T I O N F 7105764 02 1 11 12 ...
