Working; Combustion Adjustment; Combustion Head Setting - Riello BS2/M TL Manuel D'entretien

5.

WORKING

5.1

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 concentration in the flue gases, their temperatures and the average temperature of the water in the
2
boiler. To suit the required appliance output, choose the proper setting of the combustion head, and the air
damper servomotor.
5.2

COMBUSTION HEAD SETTING,

Combustion head adjustment varies depending
on burner delivery.
It is carried out by rotating clockwise or counter-
clockwise the setting screw (6) until the set-
point marked on the regulating rod (2) is level
with the outside plane of the head assembly (1).
In figure 9, the head's regulating rod is set to set-
point 3.5.
Example for burner type 917M:
The diagram is orientative and indicates com-
bustion head setting depending on required ther-
mal power. To assure a good working of the
burner, we suggest to adjust the combustion
head according to the boiler.
The burner is installed in a 100 kW boiler. con-
sidering an efficiency of 90%, the burner will
have to deliver about 110 kW; for this output, ad-
justment should be made to setpoint 3.5.
HEAD ASSEMBLY REMOVING
To remove the head assembly, carry out the fol-
lowing operations:
Make sure servomotor (7) is in the closing po-

sition (CAM II = 0).
Disconnect the connections (3 and 5).

Loosen the screws (4) and remove the servo-

motor (7).
ATTENTION
Rotation shaft (10) managed by the servomo-
tor (7) features a safety mechanism (11) that
prevents it turning accidentally whilst main-
tenance work is in progress.
Loosen the screw (9), loosen screws (8) and

remove head-holder assembly (1) by rotating
slightly to the right.
Take care not to alter the regulating rod-el-
bow (2) position while disassembling.
REASSEMBLY OF THE HEAD SYSTEM
Refit following the above procedure in the
reverse order, restoring the head assembly (1) to
its original position.
ATTENTION
(9)
Tighten the screws

;
completely then lock them with a torque wrench
setting of 3 - 4 Nm.
Control that, during the working, there are not

gas losses coming from the screws
3134
(see fig. 9)
210,000
170,000
130,000
(without locking them)
.
5
1
3
7
4
E9223
kcal/h kW
250
230
210
190
170
150
130
110
90,000
90
70
50,000
50
30
10,000
10
0 2
10 GB
Fig. 9
1 2
4 6 8
Set point
9
6
8
11
10
D4456
10