20017633
9
GB
4.
WORKING
4.1
COMBUSTION 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 observ-
ing the instruction manual of the boiler,
including verification of the CO and CO
2
con-
centration in the flue gases, their tempera-
tures and the average temperature of the
water in the boiler. To suit the required appli-
ance output, choose the proper setting of the
combustion head, and the air damper opening.
4.2
COMBUSTION HEAD SETTING,
(see fig. 9)
Setting depends on the output of the burner.
Rotate the setting screw (6) in a clockwise or
anticlockwise direction until set point marked
on the regulating rod (2) is level with the out-
side plane of the head assembly (1).
Figure 9 shows the head regulating rod set on
set point
3
.
Example for HELIS 2 GI1210 2A burner:
The burner is installed in a 100 kW boiler.
Taking an efficiency level of 90% the burner
should give an output of app. 110 kW with the
regulating rod set at set point
3
as shown in
the diagram.
The diagram is for indication purposes: to as-
sure good working from the burner we sug-
gest adjusting the combustion head according
to the boiler.
REMOVING THE HEAD ASSEMBLY
Proceed as follows to remove the head assembly:
Disconnect the connections (3 and 5).
Extract the small tube (4) and loosen the
screws (10).
Unscrew and remove the screws (7), pull
out the head assembly support (1) turning
it slightly to the right.
Take care not to change the setting posi-
tion on the elbow-bracket (2) during dis-
mantling.
REASSEMBLING THE HEAD ASSEMBLY
Follow the above instructions in reverse, re-
turning the head assembly (1) to its original
position.
WARNING
Tighten the screws (7) completely (without
locking them); then lock them with a torque
wrench setting of 3-4 Nm.
Check there are no gas leaks from the screws during these operations.
If the pressure test point (13) should work loose, it must be correctly fixed ensuring that the hole (F) in-
side the head assembly (1) is facing downwards.
Fig. 9
S7006
Set-point
D8958
170,000
50,000
210,000
130,000
90,000
10,000
kcal/h
kW
0
8
2
4
6
210
10
50
70
110
130
150
170
190
30
90
230
250
10
270
12
916T1
91
7T
1
91
8T
1
