20014622
7
GB
4.3 AIR DAMPER SETTING
The regulation of the air-rate is made by adjusting the air damper
(1)
, af-
ter loosing the screws
(2)
.
When the optimal regulation is reached,
screw tight the screws (2)
.
4.4
BURNER STARTING
Air evacuation:
it can be obtained by opening the right screw on the
pressure test point placed at the beginning of the valves (see scheme
page 4).
REVISION OF THE GAS OUTPUTS
In order to obtain the gas output
Qn
under normal conditions
(0°C - 1013 mbar), correct the output measured at the counter
Qr
with a corrective factor (
f
):
Example:
Output measured at the counter . = 14 m
3
/h
Atmospheric pressure
. . . . . . . . = 998 mbar
Gas temperature . . . . . . . . . . . . . = 10°C
Gas pressure . . . . . . . . . . . . . . . . = 25 mbar
Corrective factor . . . . . . . . . . . . . = 0.9742
Nominal output . . . . . . . . . . . . . . = 13.64 m
3
/h
4.5
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 control
box operation is 3 µA.
The burner normally supplies a higher current
value, so that no check is needed. However, if
you want to measure the ionization current, you
must open the connector fitted to the red 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
1
D5231
2
2
Qn = f . Qr
f = 0.2695 .
Patm + Pgaz
273 + tgaz
Patm
= atmospheric pressure (mbar)
Pgaz
= gas pressure at the counter (mbar)
tgaz
= temperature at the counter (°C)
(m
3
/h)
or:
Probe
Connector
Terminal board
of control-box
D5006
10
