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I-40
B-070343_EN • B
P
roduct
I
nstallatIon
î
Connection of the boiler to a
G31 gas system should com-
ply with local regulations and
requirements.
î
If the boiler was running before con-
version, allow it to cool down before
performing any task.
î
Conversion of the appliance
from one gas type to another can
only be performed by a qualified
professional.
î
If the boiler is intended to be
used with G31 liquefied petrole-
um gas (propane), installing the
boiler below ground level can
be hazardous and prohibited in
some countries. Please refer to
applicable local regulations for
installation requirements.
î
If the boiler is already installed
before conversion, the boiler
must be turned off, the power
supply must be disconnected
through the external fuse or cir-
cuit breaker, and the gas supply
to the gas valve must be closed.
î
This procedure explains how to
enable an appliance adjusted in
factory for G20 natural gas to op-
erate with G25 natural gas or G31
propane gas.
î
Gas conversion to this appliance does
not require component replacement,
only adjustments:
î
of gas valve (through shutter and
offset screws)
î
of boiler settings (fan speeds at
ignition, and at max. and min. out-
puts).
î
Conversion can therefore be carried out
either on a boiler about to be installed, or
on an already installed and running boil-
er, provided that the installation location
allows it.
i
Combustion and Gas Values
N 280 FS
N 420 FS
N 570 FS
N 840 FS
min
max
min
max
min
max
min
max
CO
2
contents
G20 (+/-0.1)
%
8.6
9.5
8.4
9.5
8.1
9.6
8.8
9.6
G25 (+/-0.1)
%
9.1
9.5
9.1
9.5
9.1
9.5
9.1
9.6
G31 (+/-0.1)
%
10.7
11.0
10.6
11.0
10.6
11.1
10.7
11.2
O
2
contents
G20 (+/-0.1)
%
5.9
4.3
6.4
4.3
6.0
4.1
5.3
4.1
G25 (+/-0.1)
%
4.4
3.7
4.4
3.7
4.4
3.5
4.4
3.5
G31 (+/-0.1)
%
4.5
4.2
4.4
4.2
4.4
4.1
4.5
4.0
Gas
pressure
G20 (20 mbar)
mbar
17 - 25
G25 (25 mbar)
mbar
20 - 30
G25.1 (25 mbar)
mbar
18 - 33
G25.3 (25 mbar)
mbar
20 - 30
G31 (30/37/50 mbar)
mbar
25 - 35 / 25 - 45 / 42.5 - 57.5
Gas
flow rate
G20
m3/h
2.6
26.2
4.8
40.4
6.5
52.1
8.6
77.8
G25
m3/h
3.0
30.5
5.6
47.0
7.6
60.6
10.0
90.5
G31
m3/h
2.5
10.2
3.7
15.0
5.1
20.7
7.6
31.0
Gas Conversion