Riello 20162652, Инструкции по установке, использованию и обслуживанию

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27 20162733 GB
Installation
5.12.4 Gas pressure
Tab. L indicates the minimum pressure drops along the gas sup-
ply line, depending on the maximum burner output.
The values shown in Tab. L refer to:
–
Natural gas G 20 NCV 9.45 kWh/Sm
3
(8.2 Mcal/Sm
3
)
Column 1
Combustion head pressure drop.
Gas pressure measured at the test point P1)(Fig. 22), with:
•
Combustion chamber at 0 mbar;
• Burner working at maximum output;
• Combustion head adjusted as in page 22.
Column 2
Pressure loss at gas butterfly valve 14)(Fig. 4 on page 13) with
maximum opening: 90°.
Calculate the approximate maximum output of the burner in this
way:
–
subtract the combustion chamber pressure from the gas
pressure measured at test point P1)(Fig. 22).
– Find, in the table Tab. L related to the burner concerned, the
pressure value closest to the result of the subtraction.
– Read the corresponding output on the left.
Example RS 410/EV FGR with G20 natural gas:
Maximum output operation
Gas pressure at test point P1)(Fig. 22)
= 25.0 mbar
Pressure in combustion chamber = 5 mbar
25.0 - 5 = 20.0 mbar
A pressure of 20.0 mbar, column 1, corresponds in the table Tab.
L to an output of 2745 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. 22),
set the MAX output required from the burner operation:
–
find the nearest output value in the table Tab. L for the burner
in question.
– Read, on the right (column 1), the pressure at the test point
P1)(Fig. 22).
– Add this value to the estimated pressure in the combustion
chamber.
Example for RS 410/EV FGR with G20 natural gas:
Required burner maximum output operation: 2745 kW
Gas pressure at an output of 2745 kW
= 20.0 mbar
Pressure in combustion chamber = 5 mbar
20.0 + 5 = 25.0 mbar
Pressure required at test point P1)(Fig. 22).
Tab. L
WARNING
The heat output and gas pressure data in the
head refer to operation with gas butterfly valve
fully open (90°).
kW
1

p (mbar) 2

p (mbar)
G 20
RS 410/EV FGR
595 2 0.3
953 4 0.5
1312 6 0.7
1670 9 1
2028 12 1.3
2387 15 1.7
2745 20 2.2
3103 25 2.7
3462 31 3.3
3820 38 4
RS 51
0/EV FGR
660 3 0
1120 6 0.1
1580 9 0.3
2040 13 0.5
2500 18 0.9
2960 24 1.4
3420 31 2.1
3880 39 3
4340 49 4.1
4800 60 5.4
RS 6
10/EV F
G
R
912 2 0
1461 4 0
2009 6 0.1
2558 10 0.3
3107 14 0.8
3655 19 1.6
4204 25 2.4
4753 32 3.2
5301 40 4
5850 49 4.6