20148124
24
GB
Installation
5.13.2 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.
5.13.3 Gas train installation
The gas train is prearranged to be connected to the burner by the
flange 1)(Fig. 27).
5.13.4 Gas pressure
Tab. L indicates the pressure drops of the combustion head and
gas butterfly valve depending on the burner operating output.
Tab. L
The values shown in Tab. L refer to:
–
Natural gas G 20 NCV 9.45 kWh/Sm
3
(8.2 Mcal/Sm
3
)
–
Natural gas G 25 NCV 8.13 kWh/Sm
3
(7.0 Mcal/Sm
3
)
Column 1
Combustion head pressure drop.
Gas pressure measured at test point P1)(Fig. 27), with:
•
combustion chamber at 0 mbar;
•
burner working at maximum modulating output;
•
combustion head adjusted as in page 19.
Column 2
Pressure loss at gas butterfly valve P2)(Fig. 28) with maximum
opening: 90°.
To calculate the approximate output at which the burner
operates:
–
subtract the pressure in the combustion chamber from the
pressure of the gas at test point P1)(Fig. 28).
–
Find in Tab. L related to the burner concerned, the pressure
value closest to the result of the subtraction.
Read the corresponding output on the left.
DANGER
Disconnect the power supply using the system
main switch.
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.
P1
D3095
Fig. 27
kW
1
p (mbar)
2
p (mbar)
G 20
G 25
G 20
G 25
3500
11.5
16.5
2.7
3.5
4000
15.2
22.3
3.6
4.6
4500
19.0
28.1
4.5
5.8
5000
22.7
33.9
5.5
7.2
5500
26.4
39.7
6.7
8.7
6000
30.2
45.5
8.0
10.3
6500
35.4
51.3
9.4
12.1
7000
38.9
57.9
10.9
14.0
7500
44.8
66.6
12.5
16.1
8000
50.6
75.4
14.2
18.3
ATTENTION
Data of head thermal power and gas pressure
refer to operation with gas butterfly valve fully
open (90°).
Summary of Contents for RLS 800/M MX
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