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Example with natural gas G20:
Operation at maximum modulating output
Gas pressure at test point P1)(Fig. 28)
Pressure in combustion chamber
A pressure of 30.2 mbar, column 1, corresponds in Tab. K to an
output of 6000 kW.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
To calculate the required gas pressure at test point P1)(Fig. 28),
set the maximum modulating output required from the burner op-
eration:
–
find the nearest output value in Tab. K for the burner in ques-
tion.
–
Read, on the right (column 1), the pressure at the test point
P1) (Fig. 28).
–
Add this value to the estimated pressure in the combustion
chamber.
Example with natural gas G20:
Operation at maximum modulating output
Gas pressure at an output of 6000 kW
Pressure in combustion chamber
30.2 + 5
pressure required at test point P1)(Fig. 28).
20070790
Key (Fig. 28)
P1 Pressure test point at the combustion head
P2 Pressure test point at the gas butterfly valve
2 Manual on/off valve
12 Pilot gas supply
13 Pressure adjuster of pilot line
14 Safety valve
15 Operation valve
= 35.2 mbar
=
5 mbar
35.2 - 5
= 30.2 mbar
= 30.2 mbar
=
5 mbar
= 35.2 mbar
Installation
5.13.5 Pilot - gas train connection
The burner is fitted with a dedicated gas train that is fixed to the
pipe coupling.
➤ It should be connected to the main train downstream the fil-
ter or the pressure adjuster (depending on configuration).
Oil burners (with LPG pilot) can be directly connected to the LPG
cylinder.
Supply pressure 68 ÷ 500 mbar.
WARNING
5.13.6 Ignition pilot burner
For proper operation, adjust gas pressure (measured at pressure
test point 1)(Fig. 29) as follows: 16 mbar (7.3 Nm
Check pilot flame stability before starting up the
main burner.
WARNING
In the case of ignition problems check:
➤ correct positioning of the ignition electrode;
➤ the gas pressure, according to indications.
Fig. 28
25
GB
3
/h).
D9266
Fig. 29
20010305
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