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InstallatIon
propane conVersIon
As indicated on the data plate, the boiler is factory preset to operate
with G20 gas, G25 gas, G30 gas or G31 gas.
To convert the boiler to another type of gas, it is necessary to:
• change the orifice
• adjust the CO
2
• adjust the parameters as indicated in the chart below.
The CO
parameters to be set are indicated in the technical data table.
2
CHANgINg THE ORIFICE:
1. Turn off the gas and electric power supplies.
2. Unscrew the gas pipe coupling (A) below the valve.
3. Unplug the gas valve (B).
4. Dismantle the gas valve-venturi assembly (C).
5. Remove the gas valve from the venturi (D) and change the orifice (F).
Important: position the orifice seal(s) correctly (E).
6. Reassemble the gas valve-venturi assembly, following the same procedure
in reverse order.
7. Stick the yellow (617g0152) "Propane" self adhesive sticker on the
gas valve (B).
The conversion of natural gas to propane or the
reverse is not authorized in certain countries
such as Belgium.
Refer to the gas categories chart.
Before carrying out the CO
the fan speed parameters as indicated in the table below.
setting with front panel closed
Boiler's maximum power
Maximum fan speed
Boiler's minimum power
Minimum fan speed
= Minimum load
= Maximum load (central heating)
setting with front panel open
Boiler's maximum power
Boiler's minimum power
664Y4200 • F
setting, it is important to modify
2
% co
2
rpm
% co
2
rpm
%
%
% co
2
% co
2
D
C
prestige 18
g20
g25
g30
g31
prestige 18
g20 - g25
g30 - g31
8.9
10.5
6000
5700
8.6
10.2
1100
1500
0
8
100
94
8.7
10.3
8.4
10
EN • 28
E
F
Cover plate
prestige 32
5.2
—
5.2
—
3.4
5.2
3.4
5.2
prestige 32
g20 - g25
g30 - g31
8.9
6250
6200
8.6
1100
1500
0
100
8.7
8.4
B
A
10.5
10
8
100
10.3
9.8
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