270
cod. 3540000251 - Rev. 00 - 03/2024
EN
ALHENA C
the three power levels "
Hi
", "
ME
" and "
Lo
” can be scrolled by pressing the
"H or -
"
buttons to recheck or correct the
CO
2
level.
• Press the
“OFF/Summer/Winter”
and
“H”
buttons for 5 seconds to exit the com-
plete manual calibration mode and save the settings. Modification of the parameters to
adjust the
CO
2
in complete manual calibration mode will take not more than about 8 minutes
Checking the combustion values
MAKE SURE THE FRONT PANEL IS CLOSED AND THE INTAKE/FUME EXHAUST DUCTS
ARE COMPLETELY ASSEMBLED.
1. Put the boiler in heating or DHW mode for at least 2 minutes.
2. Activate
TEST
mode (see *** 'TEST mode activation' on page 272 ***).
3. Using a combustion analyzer, connected to the arrangements located on the starting accesso-
ries on top of the boiler, check that the CO
2
content in the fumes, with the boiler operating at
maximum and minimum power, matches that given in table 9.
Table 9- CO2 values to respect
4. If the combustion values do not match, do the
manual calibration
as described in the following
paragraph.
5. Activate a manual calibration and then modify the
Hi
,
ME
and
Lo
values to obtain values of
CO
2
as per table 9.
THE “CO” VALUES PRODUCED BY THE DEVICE COMPLY WITH LOCAL REGULATIONS.
Calibration
IMPORTANT: During the “Complete ma-
nual calibration” or “Manual calibration”
procedure, or during the “CO
2
value che-
cking” phase, the front panel must be
closed and the inlet/fume outlet ducts
completely assembled.
Manual calibration
Calibration procedure
.
• Put the boiler in
standby mode
.
• To activate manual calibration, simultaneously press the
OFF/Summer/Winter
buttons (detail
7 - fig. 1) and the
“H”
button (detail 4 - fig. 1) for 5 seconds. Calibration will start in
heating request. If there is insufficient heat dissipation, a DHW request can be made (the three-
way valve will automatically switch in the DHW circuit).
• Manual calibration will start. During the ignition phase, the flashing symbols
MA
and
"nu"+ ra-
faucet
alternating will appear. With flame present (flashing icons “Hi + flame + faucet
+ radiator”) the boiler will do the check first in
Hi
(maximum power) then
ME
(Medium power)
then
Lo
(minimum power). Calibration can be stopped at any time by pressing the
"OFF/Sum-
mer/Winter"
and
"H”
buttons for 5 seconds.
• Afterwards, a numerical value between 0 and 6 will appear on the display
(at this point the
boiler is at minimum power "Lo").
At this point the
CO
2
can be adjusted.
Using the "DHW + and -” buttons, adjust the
CO
2
at minimum power (
Lo
); each time the
"DHW
+ or -"
buttons are pressed, the display will show the modified value and then the icon "
Lo
" (to
indicate the minimum power level). The adjustment range is from 0 to 6 (in all power levels
Hi
,
ME
,
Lo
), increasing the value will increase the
CO
2
level and vice versa.
Press the
"H"
button, the display will show the icon "
ME
", a numerical value will appear
when the ignition/intermediate power is reached. Using the
“DHW + and -”
buttons, adjust the
CO
2
at medium/ignition power
ME
; each time the
“DHW + or -”
buttons are pressed, the di-
splay will show the modified value and then the icon "
ME
" (to indicate medium/ignition power
level). Press the "H" button, the icon "
Hi
" will appear on the display and a numerical
value will appear when the maximum power is reached.
Using the
"DHW + and -”
buttons adjust the
CO
2
at maximum power (
Hi
).
G20
G30/G31
G230
9% ±0,8
10% ±1
10% ±1
