Converting The Boiler To Other Types Of Gas; Calibration Of Number Of Fan Revs; Adjustment Of The Air-Gas Ratio - Immergas VICTRIX EXA 28 1 ERP Instruction And Recommendation Booklet

3.4 CONVERTING THE BOILER TO
OTHER TYPES OF GAS.
If the boiler has to be converted to a different
gas type to that specified on the data nameplate,
request the relative conversion kit for quick and
easy conversion.
The gas conversion operation must be carried
out by an authorised company (e.g. Authorised
After-Sales Technical Assistance Service).
To convert to another type of gas the following
operations are required:
- disconnect the appliance;
- replace the nozzle located between the gas pipe
and gas/air mixing sleeve (Part. 9 Fig. 1-31);
- re-power the appliance;
- calibrate the number of fan revolutions (parag.
3.5):
- adjust the correct air/gas ratio (parag. 3.6);
- seal the gas flow rate regulation devices (if set-
tings are modified);
- after completing the conversion, apply the
sticker, contained in the conversion kit, near
the data nameplate. Using an indelible marker
pen, delete the data relative to the old type of
gas.
These adjustments must be made with reference
to the type of gas used, following that given in
the table (Par. 3.18).
CO
output (99 %)
G 20
G 30
G 31
Gas Valve 848
3.5 CALIBRATION OF NUMBER OF FAN
REVS.
Attention: verification and calibration is neces-
sary, in the case of transformation to other types
of gas, in the extraordinary maintenance phase
with replacement of the PCB air/gas circuit com-
ponents or in the case of installations with flue
extraction systems, with horizontal concentric
pipe measuring more than 1 metre.
The boiler heat output is correlated to the length
of the air intake and flue exhaust pipes. This
decreases with the increase of pipe length. The
boiler leaves the factory adjusted for minimum
pipe length (1m). It is therefore necessary, espe-
cially in the case of maximum pipe extension, to
check the ∆p gas values after at least 5 minutes
of the burner operating at nominal heat output,
when the temperatures of the intake air and ex-
haust flue gas have stabilised. Adjust the nominal
and minimum heat output in the domestic hot
water and central heating modes according to
the values in the table (Par. 3.18) using the dif-
ferential manometers connected to the ∆p gas
pressure points (17 and 18 Fig. 1-31).
Enter the configurations menu and regulate the
following parameters (Par. 3.8):
- minimum DHW power output;
- maximum DHW power output;
- minimum central heating output;
- maximum central heating output;
- Ignition power.
Victrix EXA 28 1 ErP
at nominal CO at minimum
2 2
output (0 %)
9.40 8.60
12.00 11.40
10.80 10.40
P1
P3
2
1
3.6 ADJUSTMENT OF THE AIR-GAS
Attention: the CO
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.
To have an exact value of CO
the technician must insert the sampling probe
to the bottom of the sample point, then check
that the CO
ing tables (using maximum tolerance of ± 2%),
otherwise change the value described as follows:
- Calibration of the minimum CO
central heating power).
Enter the chimney sweep phase without
withdrawing domestic hot water and take the
selector switches to minimum (turn them in
an anti-clockwise direction until "0" is seen on
the display).
Adjust the screw (3 Fig. 3-4) (Off-Set adjuster).
To increase the CO
screw (3) in a clockwise direction and vice versa
to decrease it.
- Calibration of the maximum CO
central heating power).
On completion of the adjustment of the
minimum CO
function active, take the heating selector switch
to maximum (turn it in a clockwise direction
until "99" is seen on the display).
Adjust the screw (3 Fig. 3-4) (gas flow rate
regulator). To increase the CO
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 32 1 ErP
CO at nominal
2
output (99 %)
G 20 9.60
G 30 12.30
G 31 10.50
12
3
28
RATIO.
verification operations must
2
in the flue gases,
2
value is that specified in the follow-
2
(minimum
2
value, turn the adjustment
2
2
keeping the chimney sweep
2
value, turn the
2
CO at minimum
2
output (0 %)
8.70
11.10
9.70
Key:
1 - Gas valve inlet pressure point
2 - Gas valve outlet pressure point
3 - Off/Set adjustment screw
12 - Outlet gas flow rate regulator
(nominal
3-3
3-4