7105764.02 (1-11/12)
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17.4 DISMOUNTING THE WATER-WATER HEAT EXCHANGER
The stainless steel plate-type water-water heat exchanger is easily disassembled with a screwdriver (see figure in annex “SEC
-
TION” F at the end of the manual ) 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 (B).
Pay great attention when dismantling the individual parts of the hydraulic assembly. Do not use sharp tools, do not apply
excessive force when removing the fixing clip.
17.5 POSITIONING THE ELECTRODES
See the figure in
“SECTION” F
at the end of this manual.
17.6 REPLACEMENT OF PARTS
If one or more of the following components are replaced:
•
Water-fumes exchanger
•
Fan
•
Gas valve
•
Gas nozzle
•
Burner
•
Flame sensing electrode
perform the Automatic Calibration procedure described below, then check and adjust the CO2% value as indicated in the section
“
COMBUSTION ADJUSTMENT FUNCTION (CO2% )
”.
When working on the appliance, check the condition and position of the flame sensing electrode and replace it if necessary.
AUTOMATIC CALIBRATION FUNCTION
Before performing this function make sure there are no heat demands in progress.
Press
and
together and hold down for at least 6 seconds. When the display indicates “
On
” press
(within 3
seconds after pressing the previous buttons).
If the display indicates “
303
” the Automatic Calibration function has not been activated. Disconnect the boiler from the
mains power supply for a few seconds and repeat the procedure.
When the function is enabled, and
flash on the display
After the ignition sequence, which can also take place after a few attempts, the boiler performs three operations (each lasting
approximately 1 minute) going first to maximum power, then to ignition power and lastly to minimum power. Before moving on to
the following phase (from maximum power to ignition power and then to minimum power),
and appear on the display.During
this phase, the power level reached by the boiler and the delivery temperature alternate on the display.
When , and
flash together on the display, the calibration function has terminated.
Press
to leave the function. The display shows
ESC
.
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 ...
