5.10.2 Gas Train; 5.10.3 Gas Train Installation; 5.10.4 Gas Pressure - Riello RS 70/E Installation, Use And Maintenance Instructions

5.10.2 Gas train

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

5.10.3 Gas train installation

Disconnect the electrical power using the main
system switch.
DANGER
Check that there are no gas leaks.
Beware of train movements: danger of crushing of
limbs.
Make sure that the gas train is properly installed
by checking for any fuel leaks.
The operator must use appropriate tools for instal-
lation.
The gas train can enter the burner from the right or left side, de-
pending on which is the most convenient, see Fig. 25.
The gas train must be connected to the gas attachment
1)(Fig. 25), with the flange 2), the gasket 3) and the screws 4)
supplied with the burner.
The gas solenoids must be as close as possible to
the burner, to ensure that the gas reaches the
combustion head within the safety time of 3s.
WARNING
Ensure that the maximum pressure to the burner
is within the calibration range of the pressure reg-
ulator.
See the accompanying instructions for the adjustment of the gas
train.
D722
Installation

5.10.4 Gas pressure

Tab. O indicates the pressure drop of the combustion head and
the gas butterfly valve depending on the operating output of the
burner.
kW
470
550
650
850
930
700
800
1000
1200
1340
930
1090
1250
1410
1512
1280
1500
1800
2100
2290
1250
1500
2000
2400
2650
The heat output and gas pressure data in the
head refer to operation with gas butterfly valve
fully open (90°).
WARNING
The values shown in Tab. O refer to:
– Natural gas G 20 NCV 9.45 kWh/Sm
– Natural gas G 25 NCV 8.13 kWh/Sm
Fig. 25
29 GB
1  p (mbar)
G 20 G 25 G 20
4.2 6.3 0.4
5.3 7.9 0.6
6.7 10.0 0.8
10.8 16.1 1.3
12.9 19.2 1.6
3.1 4.6 0.7
4.3 6.4 0.9
6.8 10.1 1.3
9.1 13.6 1.9
11.4 17.0 2.4
4.6 6.9 0.2
5.8 8.7 0.6
7.0 10.4 1.2
8.3 12.4 1.5
9.1 13.6 1.5
9.6 14.3 1.3
9.7 14.5 1.8
9.9 14.8 2.7
12.6 18.8 3.6
14.9 22.2 4.3
5.2 7.8 3.0
7.2 10.7 4.4
11.3 16.9 7.7
15.8 23.6 11.2
19.4 28.9 13.6
3
(8.2 Mcal/Sm
3
(7.0 Mcal/Sm
2  p (mbar)
G 25
0.6
0.9
1.2
2.0
2.4
1.1
1.4
2.0
2.8
3.6
0.3
0.8
1.8
2.2
2.2
2.0
2.7
4.0
5.4
6.4
4.4
6.6
11.4
16.7
20.3
Tab. O
3
)
3
)
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