ADJUSTING THE GAS VALVE
− Switch on mains power to the boiler.
− Open the gas cock.
− Turn the function selector to OFF/RESET (the di-
splay shows “- -”).
− Unscrew the four screws (A) and remove the front
trim (B).
− Press the combustion analysis button (CO).
− Wait for the burner to ignite. The display will read
out “CO” and the boiler will start functioning at
maximum central heating power. The chimney
sweep function remains active for a maximum
time of 15 minutes. If the central heating flow
reaches a temperature of 85°C, the burner shuts
down. The burner will re-ignite when central
heating flow temperature drops below 75°C.
− Remove the cap and insert the combustion
analysis probe.
− Turn the HTG trimmer clockwise until maximum
fan speed is reached (see table).
− Check the CO2 content. If the value is not as spe-
cified in the table, adjust the gas valve maximum
screw accordingly.
− Turn the HTG trimmer anticlockwise until mini-
mum speed is reached (see table).
− Check the CO2 content. If the value is not as spe-
cified in the table, adjust the gas valve minimum
screw accordingly.
− Return the HTG trimmer to the correct Max CH
setting (see table).
− Turn the function selector to exit chimney sweep
mode.
− Remove the combustion analysis probe and re-
place the cap.
− Fit the front trim (B) and secure with the four
screws (A).
The combustion analysis function stops automatically if
the control card detects an error condition. If an error
occurs during combustion analysis, proceed as follows
to perform a reset. Turn the function selector to "
}
",
and then to "
{
", and then to the desired function.
0
bar
4
1
3
2
°C
0
120
20
100
40
80
60
Max. gas
power screw
Max. gas
power screw
MAXIMUM FAN SPEED
METHANE
(G20)
PROPANE
(G31)
20 ISC Solar
6.1
6.1
x 1000 rpm
30 ISC Solar
6.0
6.0
x 1000 rpm
MINIMUM FAN SPEED
METHANE
(G20)
PROPANE
(G31)
20 ISC Solar
1 .3
1 .3
x 1000 rpm
30 ISC Solar
1.6
1.6
x 1000 rpm
MAX CO
2
VALUES
METHANE (G20)
PROPANE (G31)
20 ISC Solar
9,0
10,0
%
30 ISC Solar
9,0
10,0
%
MIN CO
2
VALUES
METHANE (G20)
PROPANE (G31)
20 ISC Solar
9,5
10,0
%
30 ISC Solar
9,5
10,0
%
48
TECHNICAL ASSISTANCE SERVICE
