2546001
10
GB
2)
For the maximum capacity required, first set the head (section 5.1), and then the manual air damper
as per the table at page 9.
3)
Select the manual
(MAN)
mode operation, and switch
ON
the burner.
4)
When the burner is alight, press the
(+)
button to manually drive the servomotor to the high fire posi-
tion and check that the gas pressure also increases.
5)
Check the gas flow rate at high fire. To set the correct flow rate use the screw adjustments
V
and
N
on
the valve body (mainly
V
). Increasing the setting of either
V
or
N
increases the gas flow.
6)
Adjust the manual air damper to give the required CO
2
level in the flue products. If adjusting the air
damper alters the gas flow rate then adjust
V
accordingly.
7)
Decrease the servomotor position to low fire by pushing the
(–)
button. Check the gas flow rate and
adjust if necessary, with screw
N
only, to give the required CO
2
level in the flue products.
8)
If the low fire output is then more or less than required, adjust
CAM III (Orange)
accordingly. Any
adjustment of screw
N
will affect the high fire gas rate.
9)
Return the servomotor to the high fire position. Re-adjust the high fire gas rate using only screw
V
.
10)
Again return the servomotor to the low fire position and re-adjust the low fire gas rate using only screw
N
.
11)
Repeat steps (9) and (10) two or three times until no re-adjustment of screws
V
and
N
is necessary.
12)
Finally return the selector switch to the automatic
(AUT)
mode position.
5.4 COMBUSTION ADJUSTMENT
In conformity with Efficiency Directive 92/42/EEC the application of the burner on the boiler, adjustment
and testing must be carried out observing the instruction manual of the boiler, including verification of the
CO and CO
2
concentration in the flue gases, their temperatures and the average temperature of the water
in the boiler.
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 necessary for the control box operation is 2 ±A. The burner normally supplies a
higher current value, so that no check is needed.
Anyway, if you want to measure the ionization current, you have to open the connector
(CN3)
(see electrical
scheme page 6) fitted on the wire and insert a microammeter.
EN 676
AIR EXCESS:
max. output
λ
ð 1.2
– min. output
λ
ð 1.3
GAS
Theoretical max. CO
2
0 % O
2
Setting CO
2
%
CO
mg/kWh
NO
x
mg/kWh
λ
= 1.2
λ
= 1.3
G 20
11.7
9.7
9.0
100
170
G 30
14.0
11.6
10.7
100
230
G 31
13.7
11.4
10.5
100
230
Probe
Connector
Control box
terminal strip
D5006
1
