Gas Train; Gas Train Installation; Gas Pressure - Riello RLS 70 Manual

5.12.2 Gas train

Type-approved in accordance with EN 676 and supplied
separately from the burner.

5.12.3 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 must be connected to the gas connection
1)(Fig. 28), using the flange 2), the gasket 3) and the screws 4)
supplied with the burner.
The train can enter the burner from the right or left side,
depending on which is the most convenient, see Fig. 28.
20168481
Installation
D722
Fig. 28
26

5.12.4 Gas pressure

Tab. K indicates the pressure drops of the combustion head and
gas butterfly valve, on the basis of the burner operating output.
kW
G20
465 5.5
515 5.6
565 5.7
615 5.8
665 5.9
715 6.0
765 6.1
814 6.2
698 8.0
760 8.3
825 8.6
890 8.9
955 9.2
1020 9.4
1085 9.7
1163 10.0
930 9.3
1010 9.5
1090 9.7
1170 9.9
1250 10.4
1395 11.5
Data of head thermal power and gas pressure
refer to operation with gas butterfly valve fully
open (90°).
ATTENTION
The values shown in Tab. K refer to:
– Natural gas G 20 NCV 9.45 kWh/Sm
– Natural gas G 31 NCV 27 kWh/Sm
Column 1
Combustion head pressure drop.
Gas pressure measured at test point 1)(Fig. 29 on page 27), with:
– combustion chamber at 0 mbar;
– Burner operating in 2nd stage
– Gas G20 (methane) - G31 (propane)
To calculate the approximate output at which the burner operates
in the 2nd stage:
– subtract the combustion chamber pressure from the gas
pressure measured at test point 1)(Fig. 29 on page 27).
– Find in Tab. K related to the burner concerned, the pressure
value closest to the result of the subtraction.
– Read the corresponding output on the left.
GB
1 p (mbar)
G25 G31
8.2
8.3
8.5
8.6
8.8
8.9
9.1
9.2
11.9 10.3
12.4 10.5
12.8 10.8
13.3 11.1
13.7 11.4
14.0 11.6
14.5 11.8
14.9 12.0
13.9 10.5
14.2 10.9
14.5 11.4
14.8 11.8
15.5 12.9
17.1 14.4
3
(8.2 Mcal/Sm
3
(23.2 Mcal/Sm
6.3
6.4
6.5
6.7
6.8
7.1
7.4
7.8
Tab. K
3
)
3
)