20025473 8
COMBUSTION HEAD ADJUSTMENT
In conformity with Efficiency Directive 92/42/EEC
the application of the burner on the boiler, adjust-
ment and testing must be carried out observing
the instruction manual of the boiler, including ver-
ification of the CO and CO2concentration in the
flue gases, their temperatures and the average
temperature of the water in the boiler.
Loose the screw (A), move the elbow (B) so that
the rear plan of the coupling (C) coincides with
the set point.
Tight the screw (A).
Example:
The burner is installed on a 40 kW
boiler with an efficiency of 90%, the
burner input is about 44 kW using
the diagram below, the combustion
set point is 3.
The diagram is to be used only for
initial settings, to improve air
pressure switch operation or
improve combustion, it may be
necessary to reduce this setting
(set point toward position 0).
It is advisable to set the burner according to the type of gas used and following the indications of
the table:
IONIZATION CURRENT
The minimum current required by the
control box is 5 μA.
The burner would normally have a
higher current value than this, but if a
check is required, open the connector
fitted in the red probe lead and insert a
microammeter as shown.
EN 676 AIR EXCESS: max. output 1.2 – min. output 1.3
GAS Theoretical max. CO2
0 % O2
Setting CO2% CO
mg/kWh NOx
mg/kWh
= 1.2 = 1.3
G 20 11.7 9.7 9.0 100 170
G 25 11.5 9.5 8.8 100 170
G 30 14.0 11.6 10.7 100 230
G 31 13.7 11.4 10.5 100 230
02134
70
50
40
30
20
10
60
50,000
40,000
30,000
20,000
10,000
kcal/h kW
Set point
D5068
5
60,000
44
Ionization probe
Connector
2
Control box
terminal block D5006
