3150
12
GB
4.3
AIR DAMPER SETTING,
(fig. 8, page 11)
Do not carry out the first ignition with the air
damper lower than set point 1.
The air damper leaves the factory set for minimum
output.
To vary the setting proceed as follows:
³
Loosen the nut (9) and the screws (8).
³
Once you have done, tighten the nut (9).
4.4
PROBE-ELECTRODE POSITIONING
³
Ensure that the plate (3, fig. 9) is always inserted in the
flattening of the electrode.
³
Lean the probe insulator (4) against the cup (2).
4.5
POSITIONING OF PRESSURE TEST POINT
Should the pressure test point device (8, fig. 1 page 2)
on the air intake come loose by accident, you are ad-
vised to secure it properly as illustrated in figure 10.
4.6
COMBUSTION CHECK
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 con-
trol box operation is 5 µA.
The burner normally supplies a higher cur-
rent value, so that no check is needed. Any-
way, if you want to measure the ionization
current, you have to open the connector
(
CN1
see electrical scheme page 10) fitted
on the wire and insert a microammeter.
EN 676
AIR EXCESS: max. output
λ
≤
1.2
– min. output
λ
≤
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 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
D6088
±
0.3
3.5
±
0.3
A
Fig. 9
1
3
2
4
Fig. 10
1
2
0
°
D4497
View from inside
air intake
TYPE
A (mm)
911 T1
17
912 T1
30
913 T1
31
914 T1
31
KEEP TO GIVEN DISTANCES
ATTENTION
For type 911 T1 only
D4631
+
_
SO
CN1