Gas Train; Gas Train Installation; Gas Pressure - Riello DB 4 LSM C13 Installation, Use And Maintenance Instructions

4.14.3 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.

4.14.4 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 pre-arranged to be connected to the burner at the
flange 2)(Fig. 27).
1
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Installation
2
Fig. 27
23 GB

4.14.5 Gas pressure

Tab. J indicates the pressure drops of the combustion head and
gas butterfly valve, on the basis of the burner operating output.
1800 5,4
2000 6,9
2250 8,8
2500 10,7
2750 12,5
3000 14,4
3250 15,6
3500 16,7
3750 18,2
4000 20,1
4300 22,5
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. J 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. 27), with:
• combustion chamber at 0 mbar;
• burner working at maximum modulating output;
• combustion head set as on pag. 28.
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 27) 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. 27).
– Find, inTab. J related to the burner concerned, the pressure
value closest to the result of the subtraction.
Read the corresponding output on the left.
6,7 2,8 4,2
9,0 3,5 5,2
11,9 4,4 6,5
14,8 5,4 8,1
17,7 6,5 9,8
20,6 7,8 11,6
22,7 9,1 13,6
24,8 10,6 15,8
27,2 12,2 18,2
30,0 13,8 20,7
33,5 16,0 23,9
Tab. J
3 3
(8.2 Mcal/Sm )
3 3
(7.0 Mcal/Sm )
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