28
INS
T
ALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
3.6 ADJUSTMENT OF THE AIR-GAS
RATIO.
Attention:
the CO
2
verification operations must
be carried out with the casing mounted, while the
gas valve calibration operations must be carried
out with the casing open and disconnecting the
boiler from the power supply.
Calibration of the minimum CO
2
(minimum
heating power).
Enter the chimney sweep phase without with-
drawing domestic hot water and take the se-
lector switches to minimum (turn them in an
anti-clockwise direction until "0" is seen on the
display). To have an exact value of CO
2
in the flue
gas the technician must insert the sampling probe
to the bottom of the sample point, then check
that the CO
2
value is that specified in the table,
otherwise adjust the screw (3 Fig. 3-3) (Off-Set
adjuster). To increase the CO
2
value, turn the
adjustment screw (3) in a clockwise direction
and vice versa to decrease it.
Calibration of the maximum CO
2
(nominal
central heating power).
On completion of the adjustment of the mini-
mum CO
2
keeping the chimney sweep function
active, take the heating selector switch to maxi-
mum (turn it in a clockwise direction until “99”
is seen on the display). To have an exact value of
CO
2
in the flue gas the technician must insert
the sampling probe to the bottom of the sample
point, then check that the CO
2
value is that speci-
fied in the table, otherwise adjust the screw (12
Fig. 3-3) (gas flow rate regulator).
To increase the CO
2
value, turn the adjustment
screw (12) in an anti-clockwise direction and vice
versa to decrease it.
At every adjustment variation on the screw 12 it
is necessary to wait for the boiler to stabilise itself
at the value set (about 30 sec.).
Victrix EXA 24 X 1 ErP
CO
2
at nominal
output
(central heating)
CO
2
at minimum
output
(central heating)
G 20
9.40
%
±
0.2
8.60
%
±
0.2
G 30
12.00
%
±
0.2
11.40
%
±
0.2
G 31
10.80
%
±
0.2
10.40
%
±
0.2
3.7 CHECKS FOLLOWING
CONVERSION TO ANOTHER TYPE
OF GAS.
After making sure that conversion was carried
out with a nozzle of suitable diameter for the
type of gas used and the settings are made at the
correct pressure, check that the burner flame is
not too high or low and is stable (does not detach
from burner);
N.B.:
all boiler adjustment operations must be
carried out by a qualified company (e.g. Author-
ised After-Sales Technical Assistance).
3.8 PROGRAMMING THE P.C.B.
The boiler is prepared for possible programming
of several operation parameters. By modifying
these parameters as described below, the boiler
can be adapted according to specific needs.
To access the programming phase, position
the DHW selector (5) on position “6”, the CH
selector (6) on position “9” and press the “Reset”
(3) and “Summer/Winter” buttons for about 8
seconds (2).
Once the menu has been accessed, it is possible
to scroll through the three sub-menus present
(s, p, t) by pressing the “Summer/Winter” (2)
button for 1 second.
Use the "DHW regulator" selector (5), to select
the parameter (inside the same sub-menu) and
rotate the "CH regulator" selector (6) to modify
the value according to the range available.
Press the "Reset" button (3) for 1 second to
memorise the variation of the parameters
Memorisation is represented via "88" on the
indicator (14) for 2 seconds.
Exit the programming mode by waiting for
15 minutes or by pressing the, “Reset” (3) and
"Summer/Winter" (2) buttons simultaneously.
Parameter
ID
Parameter
Description
Range
Default
S0
Minimum DHW
output
The boiler also has electronic modulation that adapts the boiler potentiality to the ef-
fective heating demand of the house. Therefore the boiler works normally in a variable
gas pressure field between minimum and maximum power depending on the system
heat load, setting fan speed (in rpm, hundreds of revs are represented on the display).
N.B.:
the boiler is produced and calibrated in the central heating phase at nominal output.
Approximately 10 minutes are needed to reach the nominal heat output, which can be
changed using the parameter (S3).
N.B.:
selection of parameters in the presence of requests, allows boiler functioning with
current equal to the respective value.
900
÷
1500
1400
S1
Maximum DHW
output
3500
÷
6100
G20
=
4600
LPG
=
4600
S2
Minimum CH
output
S0
÷
S3
1400
S3
Maximum CH
output
S2
÷
S1
G20
=
4600
LPG
=
4600
S4
Power
block
1500
÷
3500
G20
=
2000
G30
=
2000
G31
=
2000
S5
Central heating
set point mini-
mum tempera-
ture
Defines the minimum flow temperature.
20
÷
50
°
C
25
S6
Central heating
set point maxi-
mum tempera-
ture
Defines the maximum flow temperature.
(S5
+
5)
÷
85
°
C
85
S7
External probe
correction
If the reading of the external probe is not correct it is possible to correct it in order to
compensate any environmental factors.
(Over the value of
+
9 the display shows “CE”, which enables an external control function
of the boiler for coupling of the same with a system supervisor)
-9
÷
9 K
0
S8
Boiler power
Identifies the boiler's power (only useful with a coupled storage tank and parameter
P0
=
1).
0
=
12 kW
1
=
26 kW
2
=
28 kW
3
=
32 kW
1
