3.6 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 plate, request
the relative conversion kit for quick and easy
conversion.
Boiler conversion must be carried out by a
qualified technician (e.g. Immergas After-Sales
Technical Assistance Service).
To convert to another type of gas the following
operations are required:
- remove the voltage from the appliance;
- replace the nozzle located between the gas pipe
and gas/air mixing sleeve (part. 12 fig. 1-25);
- replace the Venturi (part. 11 fig. 1-25);
- apply voltage to the appliance;
- regulate the maximum heat output by varying
the number of fan revs. (parameter N° 22 “Max
number of fan revs in CH mode”) according to
par. 3.21;
- regulate the minimum heat output by varying
the number of fan revs. (parameter N° 26 “Min
number of fan revs in CH mode”) according to
par. 3.21;
- check the value of CO
2
in the flue gas at maxi-
mum heat output with respect to the table in
par. 3.22;
- check the value of CO
2
in the flue gas at mini-
mum heat output with respect to the table in
par. 3.22;
- seal the gas flow rate regulation devices (if
settings are modified);
- after completing conversion, apply the sticker,
present in the conversion kit, near to the data-
plate. Using an indelible marker pen, cancel the
data relative to the old type of gas.
These adjustments must be made with reference
to the type of gas used.
3.7 CHECKS FOLLOWING
CONVERSION TO ANOTHER TYPE
OF GAS.
After making sure that transformation was car-
ried out with a nozzle of suitable diameter for
the type of gas used and the calibration has been
performed at the correct n°. of revs, check that:
- lthe burner flame is not too high and that it is
stable (does not detach from burner)
- there are no leaks from the gas circuit.
N.B.:
All boiler adjustment operations must
be carried out by a qualified technician (e.g.
Immergas Assistance Service).
3.8 POSSIBLE ADJUSTMENTS.
Check the nominal heat output.
The boiler heat output is correlated to the length
of the air intake and flue exhaust pipes. This de-
creases slightly with the increase of pipe length.
If installed in battery and with the flue kit, after
5 minutes of burner functioning and when the
intake air and exhaust gas temperatures have
stabilised, it is necessary to update the number
of fan revs. in CH mode according to the fol-
lowing table:
3.9 ADJUSTMENT OF THE AIR-GAS
RATIO.
Calibration of the maximum CO
2
.
Switch the boiler on and take it to chimney sweep
mode by pressing the “
MODE”
and “+” keys
simultaneously for two seconds. In this way the
boiler is forced to maximum and “
H”
appears
on the display followed by a 2-figure number.
To have an exact value of CO
2
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 in par. 3.22, on the
contrary, regulate the screws (12 fig. 3-4) (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.).
Calibration of the minimum CO
2
.
On completion of regulation of the maximum
CO
2
, switch the boiler on and allow it to fun-
ction at minimum heat capacity by pressing the
“
MODE
” and “-” keys at the same time for two
seconds. In this way the boiler is forced to mini-
mum and “
L
” appears on the display followed by
a two character number. To have an exact value
of CO
2
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 in par. 3.22, on the contrary, regulate
the screws (3 fig. 3-4) (Off-Set regulator). To
increase the CO
2
value, turn the adjustment
screw (3) in a clockwise direction and vice versa
to decrease it.
G20
G31
Single boiler
Max. N°. revs 5900
Max. N°. revs 5700
Min. N°. revs 1750
Min. N°. revs 1750
Exhaust collector kit with flue
adjusting devices
Max. N°. revs 5900
Max. N°. revs 5900
Min. N°. revs 1750
Min. N°. revs 1750
3.10 CHECK COMBUSTION
PARAMETERS.
To regulate the minimum and maximum heat
outputs take the boiler into the chimney sweep
phase by pressing the “MODE” and “+” keys at
the same time for a few seconds. Now control
the maximum fan speed (with burner on) in
order to obtain the value given in the table (par.
3.21), if the parameters are modified, see the
successive chapters.
3.11 REGULATION OF THE CH
NOMINAL OUTPUT.
The “Victrix 115 1 I” boiler is produced with heat
output on CH calibrated at maximum. It is re-
commended not to touch this regulation again.
Whenever it is necessary to reduce the heat
output, the value of parameter N° 22 must be
modified “Max number of fan revs. in CH mode”,
after having inserted the technician’s code, as
described in par. 3.3.
To check the regulated heat output value, com-
pare the n° of fan revs with that in the table
(par. 3.21).
3.12 REGULATION OF THE CH
MINIMUM OUTPUT.
Whenever it is necessary to modify the CH mi-
nimum heat output, the value of parameter N°
26 must be modified “Min number of fan revs. in
CH mode”, after having inserted the technician’s
code, as described in par. 3.3.
To check the regulated heat output value, com-
pare the n° of fan revs with that in the table
(par.21).
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