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5.11.2 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.
5.11.3 Gas train installation
Disconnect the electrical 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 train can enter the burner from the right or left side,
depending on which is the most convenient, see Fig. 24.
The gas train must be connected to the gas connection
1)(Fig. 24), using the flange 2), seal 3) and screws 4) supplied
with the burner.
Data of head thermal power and gas pressure
refer to operation with gas butterfly valve fully
open (90°).
ATTENTION
The values shown in Tab. L refer to:
–
Natural gas G 20 NCV 9.45 kWh/Sm
–
Natural gas G 25 NCV 8.13 kWh/Sm
–
LPG G31 NCV 26.3 kWh/Sm
Column 1
Combustion head pressure drop.
Gas pressure measured at test point 1)(Fig. 25), with:
•
combustion chamber at 0 mbar
•
burner working at maximum output
Column 2
Pressure loss at gas butterfly valve 2)(Fig. 25) with maximum
opening: 90°.
20152093
Installation
3
3
(8.2 Mcal/Sm
)
3
3
(7.0 Mcal/Sm
)
3
3
(22.6 Mcal/Nm
)
The gas solenoid valves must be as close as
possible to the burner to ensure that the gas
reaches the combustion head within the safety
time of 3s.
ATTENTION
Make sure the maximum pressure necessary for
the burner is included in the calibration range of
the pressure regulator.
See the accompanying instructions for the adjustment of the gas
train.
D722
5.11.4 Gas pressure
Tab. L indicates the pressure drops of the combustion head and
gas butterfly valve, on the basis of the burner operating output.
1 p (mbar)
kW
G 20
1383
9.0
1500
10.7
1800
14.7
2100
20.3
2400
28.0
24
GB
2 p (mbar)
G 25
G 20
G 25
13.4
3.1
4.7
16.0
3.7
5.5
21.9
5.3
7.9
30.3
7.2
10.7
41.8
9.4
14.0
Fig. 24
Tab. L
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