Riello Gulliver RS5DF, Manual

Page: 22 / 84

20141174 20 GB
Installation
5.9.3 Gas pressure
Tab. I indicates the pressure drops of the combustion head on the
basis of the burner operating output.
The values shown in Tab. I refer to:
–
Natural gas G 20 NCV 9.45 kWh/Sm
3
(8.2 Mcal/Sm
3
)
– Natural gas G 25 NCV 8.13 kWh/Sm
3
(7.0 Mcal/Sm
3
)
Column 1
Combustion head pressure drop.
Gas pressure measured at test point M2)(Fig. 17), with:
•
combustion chamber at 0 mbar;
To calculate the approximate output at which the burner oper-
ates:
–
subtract the pressure in the combustion chamber from the
pressure of the gas at test point M2)(Fig. 17).
– Find, in Tab. I related to the burner concerned, the pressure
value closest to the result of the subtraction.
– Read the corresponding output on the left.
Example with natural gas G 20 for RS5D:
Maximum output operation
Gas pressure at test point M2)(Fig. 17)
= 12.2 mbar
Pressure in combustion chamber = 2.2 mbar
12.2 - 2.2 = 10.0 mbar
A pressure of 10.0 mbar, column 1, corresponds in Tab. I to an
output of 330 kW.
This value serves as a rough guide; the effective output must be
measured at the gas meter.
Tab. I
To calculate the required gas pressure at test point M2)(Fig. 17),
with the maximum modulating output at which you want the burn-
er to operate having been fixed:
–
find the nearest output value in the table Tab. I for the burner
in question.
– Read on the right, column 1, the pressure at the socket
M2)(Fig. 17).
– Add this value to the estimated pressure in combustion
chamber.
Example with natural gas G 20 for RS5D:
Operating at the desired maximum output: 330 kW
Gas pressure at an output of 330 kW
= 10.0 mbar
Pressure in combustion chamber = 2.2 mbar
10.0 + 2.2 = 12.2 mbar
pressure required at the test point M2)(Fig. 17).
Check that there are no gas leaks.
Pay attention when handling the train: danger of
crushing of limbs.
Make sure that the gas train is properly installed
by checking for any fuel leaks.
The operator must use the required equipment
during installation.
kW

p (mbar)
G 20 G 25 G 31
RS
4D
110 1.6 2.4 1.8
120 1.8 2.6 2.0
130 1.9 2.9 2.2
140 2.1 3.2 2.4
150 2.3 3.5 2.7
160 2.6 3.8 3.0
170 2.8 4.2 3.2
180 3.1 4.6 3.5
190 3.4 5.1 3.9
200 3.7 5.5 4.2
210 4.0 6.0 4.5
220 4.4 6.5 4.9
230 4.8 7.1 5.3
240 5.2 7.7 5.7
250 5.6 8.3 6.1
RS5D - RS5D TL
- RS5DF
160 3 4.2 4
179 3.6 5 4.4
198 4.3 6 4.8
217 5 7 5.4
236 5.8 8.1 6
254 6.5 9.1 6.7
273 7.4 10.4 7.5
292 8.2 11.5 8.4
311 9.1 12.7 9.4
330 10 14 10.5
WARNING
The data of thermal output and combustion
head gas pressure are related to full open (90°)
gas butterfly valve.