3387
11
GB
4.
WORKING
FIRING OUTPUT
The firing must occur at reducer output and not
higher than 120 kW.
In order to measure the firing output:
– Disconnect the connector (
CN1
) on the ioniza-
tion probe cable
(see electrical wiring at page
9)
; the burner will fire and then go into lock-out
after the safety time (3s) has elapsed.
– Perform 10 firings with consecutive lock-outs.
– On the meter read the total quantity of gas
burned. This quantity must be equal to or lower
than the quantity here given:
0.10 Nm
3
for G20 (natural gas H)
0.10 Nm
3
for G25 (natural gas L)
0.03 Nm
3
for G31 (LPG).
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 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. To suit the required appliance
output, choose the proper setting of the combustion
head, and the air damper opening.
The burner leaves the factory set for the min-
imum output.
4.2
COMBUSTION HEAD SETTING,
(see Fig. 9)
It depends on the output of the burner and is
c a r r i e d o u t b y r o t a t i n g c l o c k w i s e o r
counterclockwise 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 the sketch of Fig. 10 the
combustion head is set for an output of 230
kW. The set point
4
marked of the regulating
rod is at the same level with the outside plane
of the head-assembly as indicated in the
diagram.
Example for BS3DF burners:
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.
NOTE
The diagram is orientative; to assure a good
working of the burner, we suggest to adjust the
combustion head according to the boiler.
Fig. 10
Set point
170.000
50.000
210.000
130.000
90.000
kcal/h
kW
0
8
2
4
6
210
50
70
110
130
150
170
190
90
230
250
10
D8116
91
3T
2
91
4T
2
