Riello RLS 28 Installation, Use And Maintenance Instructions page 27

5.12.2 Gas train
Type-approved in accordance with EN 676 and supplied
separately from the burner.
To select the correct gas train model, refer to the manual "Burner-
gas train combination" supplied with the unit.
5.12.3 Gas train installation
Disconnect the power supply using the system
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.
Installation
5.12.4 Gas pressure
Tab. K indicates the pressure drops of the combustion head and
gas butterfly valve depending on the burner operating output.
Model
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), 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).
– 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.
D1137
Fig. 28
25 GB
1 p (mbar)
kW
G20
163 6.5
185 6.8
210 7.3
235 8
260 8.7
285 9.6
310 10.4
325 11
290 10
330 10.2
370 10.5
410 10.8
450 11.3
490 11.7
530 12.7
581 14
Data of head thermal power and gas pressure
refer to operation with gas butterfly valve fully
open (90°).
3
3
(23.2 Mcal/Sm
G31
5.5
5.7
6
6.3
6.7
7.4
8.5
9.5
8.8
8.9
9
9.1
9.2
9.3
9.7
10.5
Tab. K
3
(8.2 Mcal/Sm )
3
)
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