PART I: INSTALLATION
23
Gas pressure in combustion head vs. gas flow rate curves
Gas pressure
in
combustion
h
ead
NG550
Gas rate Stm
3
/h
NGX550
Ga
s pre
ssu
re
in
combu
stio
n head
LG550 L.P.G.
L.P.G. rate Stm
3
/h
ATTENTION:
before starting the burner up, be sure that the manual cutoff valves are open and check that the pres-
sure upstream the gas train complies the value quoted on paragraph “Technical specifications”. Be sure that the
mains switch is closed.
ATTENTION: During commissioning operations, do not let the burner operate with insufficient air flow (danger of
formation of carbon monoxide); if this should happen, make the fuel decrease slowly until the normal combustion
values are achieved.
WARNING: NEVER LOOSE THE SEALED SCREWS! OTHERWISE, THE DEVICE WARRANTY WILL BE INVALIDATE!
The values in the diagrams refer to
natural gas
with a calorific value of 8125 kcal/Stm
3
(15°C, 1013 mbar) and a density of
0.714 kg/Stm
3
.
The values in the diagrams refer to
GPL
with a calorific value of 22300 kcal/Stm
3
(15°C, 1013 mbar) and a density of 2.14 kg/
Stm
3
. When the calorific value and the density change, the pressure values should be adjusted accordingly.
0
1
2
3
4
5
6
7
8
9
10
15
20
25
30
35
40
45
50
55
60
65
0
1
2
3
4
5
6
7
8
9
10
11
12
10
15
20
25
30
35
40
45
50
55
5
10
15
20
25
5
7
9
11
13
15
17
19
21
23
25
Where:
Natural gas pressure shown in diagram
Real gas pressure
Natural gas flow rate shown in diagram
Real gas flow rate
Natural gas density shown in diagram
Real gas density