Gas Train; Gas Train Installation; Gas Pressure - Riello RLS 1300/EV C11 Installation, Use And Maintenance Instructions

5.14.2 Gas train

Approved according to standard EN 676 and provided separately
from the burner.
To select the correct gas train model, refer to the supplied "Burn-
er-gas train combination" manual.

5.14.3 Gas train installation

Disconnect the electrical power using the main
switch.
DANGER
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.
The gas train is prearranged to be connected to the burner by the
flange 1)(Fig. 28).
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Installation

5.14.4 Gas pressure

Tab. H indicates the pressure drop of the combustion head and
the gas butterfly valve depending on the operating output of the
burner.
kW
9500
10000
10500
11100
11600
12200
12700
13200
13700
14300
The data of thermal output and combustion
head gas pressure are related to full open (90°)
gas butterfly valve.
WARNING
The values shown in Tab. H refer to:
– Natural gas G 20 NCV 9.45 kWh/Sm
– Natural gas G 25 NCV 8.13 kWh/Sm
Column 1
Combustion head pressure drop.
Gas pressure measured at test point 1)(Fig. 29), with:
• combustion chamber at 0 mbar;
• burner working at maximum modulating output;
• combustion head set as on page 21.
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 29) with maximum
opening: 90°.
To calculate the approximate output at which the burner oper-
ates:
– subtract the pressure in combustion chamber from the gas
pressure measured at test point 1)(Fig. 29).
– Find, in Tab. H related to the burner concerned, the pressure
value closest to the result of the subtraction.
– Read off the corresponding output on the left.
Example with natural gas G20:
Operation at maximum modulating output
Gas pressure at test point 1)(Fig. 29)
Pressure in combustion chamber
A pressure of 39.2 mbar, column 1, corresponds in Tab. H to an
output of 8000 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 1)(Fig. 29),
Fig. 28
set the maximum modulating output required from the burner op-
eration:
– find the nearest output value in Tab. H for the burner in ques-
tion.
– read, on the right (column 1), the pressure at the test point
1)(Fig. 29).
– Add this value to the estimated pressure in combustion
chamber.
26 GB
1 p (mbar) 2 p (mbar)
G 20 G 25 G 20
60 89 17
63 94 19
69 103 21
76 113 23
84 125 25
92 137 27
101 150 29
109 162 31
116 173 33
122 182 36
3
(8.2 Mcal/Sm
3
(7.0 Mcal/Sm
= 44.2 mbar
=
44.2 - 5 = 39.2 mbar
G 25
25
28
31
34
37
40
43
46
49
54
Tab. H
3
)
3
)
5 mbar