38
+
+
3
12
2
1
P1
P3
49
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
Key:
1 - Gas valve inlet pressure point
2 - Gas valve outlet pressure point
3 - Off/Set adjustment screw
12 - Outlet gas flow rate adjuster
Gas Valve VK8205VE1011
3.8 CALIBRATION OF FAN SPEED.
Attention:
verification and calibration are necessary, in the case of
transformation to other types of gas, in the extraordinary mainte-
nance phase with replacement of the PCB, air/gas circuit compo-
nents 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 coaxial).
- activate flue test (Parag. 3.15);
- detect the flue signal ∆P (Det. 18 and 19 Fig. 36);
- compare the signal ∆P and, if necessary, correct the S1 operating
parameters with the following table:
Victrix Tera Vip
∆P > 200 Pa
G20
S1 = 126 (6300 rpm)
G31
S1 = 121 (6050 rpm)
G230
S1 = 127 (6350 rpm)
3.9 CO
2
ADJUSTMENT.
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 CO
2
at minimum output
Enter the chimney sweep mode without withdrawing DHW and
set the output to minimum (0%). To have an exact value of CO
2
in the flue, 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 (Par. 4.2), otherwise adjust the screw (Det.
3 Fig. 38) (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 CO
2
at maximum output
When you finish the minimum CO
2
adjustment, while main-
taining the chimney sweep function active, set the output to
maximum (99%). To have an exact value of CO
2
in the flue,
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 (Par. 4.2), otherwise adjust the screw
(Part. 12 Fig. 38) (gas flow rate regulator).
To increase the CO
2
value, turn the adjustment screw (12) in a
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.).
3.10 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);
Maintenance interventions must be carried out by
an authorised company (e.g. Immergas After-Sales
Technical Assistance Service).
