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- apply voltage to the appliance;
- calibrate the number of fan revs. (Par. 3.5):
- adjust the correct air/gas ratio (Par. 3.6);
- 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, following that given in
the table (par. 3.17).
3.5 CALIBRATION OF NUMBER OF FAN
REVS.
Important: 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 circuit board, air/gas
circuit components or in the case of installations
with fume 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
burner functioning at nominal heat output, when
the temperatures of the intake air and exhaust
fumes have stabilised. Adjust the nominal and
minimum heat output in the domestic hot water
and central heating modes according to the va-
lues in the table (Par. 3.17) using the differential
manometers connected to the ∆p gas pressure
point (39 and 40 Fig. 1-23).
Enter the configurations menu under the "SER-
VICE" item and adjust the following parameters
(Par. 3.8):
- boiler maximum heat output "P62";
- boiler minimum heat output "P63";
- maximum central heating output "P64";
- minimum central heating output "P65";
Below find the default settings present on the
boiler:
G20:
P62
5580 (rpm)
4980 (rpm)
G20:
P63
1020 (rpm)
1010 (rpm)
G20:
P64
5100 (rpm)
4500 (rpm)
G20:
P65
1020 (rpm)
1010 (rpm)
3.6 ADJUSTMENT OF THE AIR-GAS
RATIO.
Calibration of the minimum CO
heating power).
Enter the chimney sweep phase without wi-
thdrawing domestic hot water and take the
selector switches to minimum (turn them in an
anti-clockwise direction until "0" is seen on the
SIT 848 Gas Valve
display). to have an exact value of CO
fumes the technician must insert the sampling
probe to the bottom of the sample point, then
check that the CO
table, otherwise adjust the screw (3 Fig. 3-3) (Off-
Set adjuster). To increase the CO
adjustment screw (3) in a clockwise direction and
vice versa to decrease it.
Calibration of the maximum CO
heat output).
On completion of the adjustment of the mini-
mum CO
keeping the chimney sweep function
2
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
in the fumes the technician must insert
2
the sampling probe to the bottom of the sample
LPG:
point, then check that the CO
cified in the table, otherwise adjust the screw (12
LPG:
Fig. 3-3) (Gas flow adjuster).
To increase the CO
LPG:
screw (12) in an anti-clockwise direction and vice
versa to decrease it.
LPG:
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.).
(minimum
2
in the
2
value is that specified in the
2
value, turn the
2
(nominal
2
3.7 CHECKS FOLLOWING CONVERSION
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);
value is that spe-
N.B.: All boiler adjustment operations must
2
be carried out by a qualified technician (e.g.
Immergas After-Sales Technical Assistance
value, turn the adjustment
Service).
2
Key:
1 - Gas valve inlet pressure
point
2 - Gas valve outlet pressu-
re point
3 - Offset adjustment screw
12 - Outlet gas flow rate
regulator
P.C.B.
Key:
4 - Line fuse 3.15AF
5 - Fan speed check
connector
CO
at nominal
CO
at minimum
2
2
output
output
(central heating)
(central heating)
G 20
9,50% ± 0,2
9,00% ± 0,2
G 30
12,30% ± 0,2
11,80% ± 0,2
G 31
10,60% ± 0,2
10,10% ± 0,2
TO ANOTHER TYPE OF GAS.
PL
CZ
HU
RO
Fig. 3-3
IE
SK
Fig. 3-4
143
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