Immergas HERCULES Condensing 26 2 E Manual page 32

Technical Documentation
Regulation of the air-gas ratio (off-set).
The correct regulation of the air-gas ratio (1:1) takes place
in the factory and must be retouched only when carbon
dioxide (CO ) values are detected in the fumes that are
2
not optimal.
With this scope, during the initial check or following ex-
traordinary maintenance interventions, flue analysis must
be performed at maximum heat output and minimum heat
output, which attests the goodness of the combustion in refer-
ence to the values indicated in the table below:
26 2 E
HERCULES Condensing
CO at nominal output
2
(central heating)
G 20 9,40% ± 0,2
G 30 12,10% ± 0,2
G 31 10,70% ± 0,2
32 2 I
HERCULES Condensing
CO at nominal output
2
(central heating)
G 20 9,40% ± 0,2
G 30 12,30% ± 0,2
G 31 10,50% ± 0,2
To carry out the control correctly and, if necessary, regulate
the air-gas ratio, proceed as follows:
VK 8115 gas valve
Calibration of the minimum CO
- start the boiler in chimney sweep functioning mode without
withdrawing DHW and adjust the C.H. temperature selec-
tor, present on the control panel, to minimum.
- withdraw the combustion products by inserting the analyser
probe fully home.
- check whether the value of carbon dioxide (CO
the limits indicated in the table regarding the minimum heat
output (see table);
- if the values are incorrect, take them within the limits by
acting on the off-set adjusting screws (3) of the gas valve.
By turning in a clockwise direction the CO
by turning in an anti-clockwise direction, it increases.
Calibration of the maximum CO
- take the C.H. temperature selector, present on the control
panel, to maximum and check the correspondence of the
carbon dioxide (CO ) value measured with that indicated
2
in the table regarding the nominal heat output (see table).
- if the values are incorrect, take them within the limits by
acting on the off-set adjusting screws (12) of the gas valve.
STHCkW ed 0409
CO at minimum output
2
(central heating)
8,90% ± 0,2
11,80% ± 0,2
10,20% ± 0,2
CO at minimum output
2
(central heating)
8,90% ± 0,2
11,90% ± 0,2
10,30% ± 0,2
.
2
) is within
2
value decreases,
2
.
2
Technical Documentation
Key:
1 - Gas valve inlet pressure point
2 - Gas valve outlet pressure point
3 - Off-Set adjustment screw
12 - Outlet gas flow rate regulator
By turning in a clockwise direction the CO
by turning in an anti-clockwise direction, it increases.
Gas transformation.
The adaptation to the type of gas different to that for which
the boilers are prepared as per standard is performed using the
relevant kit (methane or LPG).
The transformation consists in the replacement of the gas noz-
zle positioned in correspondence with the inlet of the Venturi
pipe and adjustment of the maximum heat output (see nominal
and minimum heat output regulation).
Finally, check the carbon dioxide value (CO
and minimum power output, which must be corrected if
necessary by regulating the off-set signal (see air-gas ration
regulation).
30
value decreases,
2
) at maximum
2
HERCULES Condensing Export