-
1
,
0
0
,
0
1
,
0
2
,
0
3
,
0
4
,
0
5
,
0
6
,
0
7
,
0
8
,
0
50
100
150
200
250
300
350
400
450
500
550
600
pressione
ca
m
era
di
co
m
b
u
stione
m
bar
k
W
11
,
5
12
12
,
5
13
14
15
16
1
2
3
5
4
posi
z
ione
testa
pressione
g
as
in
testa
m
bar
PRE-CALIBRATION MAX GAS 500
-
1
,
0
0
,
0
1
,
0
2
,
0
3
,
0
4
,
0
5
,
0
6
,
0
7
,
0
8
,
0
50
100
150
200
250
300
350
400
450
500
550
600
pressione
ca
m
era
di
co
m
b
u
stione
m
bar
k
W
11
,
5
12
12
,
5
13
14
15
16
1
2
3
5
4
posizione
testa
pressione
gas
in
testa
m
bar
EXAMPLE OF PRE-CALIBRATION MAX GAS 500
Warning:
the pre-calibration values have been
determined on EN676 test combustion cham-
bers in ideal conditions, and are useful for the
first switch-on but must be checked and correc-
ted with calibration for the individual system.
Example in figure
:
Power required by the generator: 380 kW.
Pressure envisaged in combustion chamber: 3.5
mbar. Combustion head chamber: 2.5 (between
2 and 3). Gas pressure in head: 13 mbar.
Gas pressure in head
Head position
ADJUSTING THE AIR PRESSURE SWITCH
The air pressure switch must be adjusted so that an insufficient air flow does not allow
the CO value to exceed 1% in volume. After having adjusted the gas flow and obtained
optimum combustion (CO
2
= 9.5 to 9.8% and a CO value of less than 75 ppm), the air
pressure switch must be adjusted. Remove the cover with the burner operating, cover
the air intake progressively with a piece of cardboard to obtain a value of CO
2
= 10.8
(G20-G25)> 13 (G31) and a CO value of less than 5,000 ppm. Adjust the air pressure
switch until the burner shuts down. Remove the cardboard from the air intake and start
up the burner again. Replace the cover.
ADJUSTING THE GAS PRESSURE SWITCH
Adjust the pressure switch to 50% of the rated pressure of the gas used.
RARED PRESSURE:
G 20 = 20 mbar G 25 = 25 mbar
G 31 = 37 mbar
0,4
0,6
0,9
3,0
1,
5
2,1
1,
8
2,4
2,7
1,2
A
B
2,5
5
10
15
50
25
35
30
40
45
20
C
D
Pr
es
su
re
in
c
om
b.
c
ha
m
be
r
Gas pressure in head
Head position
Pr
es
su
re
in
c
om
b.
c
ha
m
be
r
EN
420010318203
Max Gas 350 - 500 P/P AB
22
