Tab.37 Authorised CO
2
ranges for gas type G31 for the models SIRIUS THREE FS 50 – SIRIUS THREE FS 70 – SIRIUS
THREE FS 110
Unit
CO
2
Authorised CO
2
%
9.5
8.8 - 9.2
%
9.6
8.9 - 9.3
%
9.7
9.0 - 9.4
%
9.8
9.1 - 9.5
%
9.9
9.2 - 9.6
%
10.0
9.3 - 9.7
%
10.1
9.4 - 9.8
%
10.2
9.5 - 9.9
%
10.3
9.6 - 10.0
%
10.4
9.7 - 10.1
%
10.5
9.8 - 10.2
(1) The CO
2
value is valid with the front panel mounted. If the front panel is removed (open chamber), the value readout is lower by 0.2%.
(2) Nominal value.
Important
The amount of CO
2
permitted at minimum power depends on the
amount of CO
2
measured at maximum power. In accordance with
the new EN 15502 standard for gas boilers, the settings ranges for
CO
2
at minimum power are indicated for each CO
2
value
measured at maximum power.
7.4.6
Adapting to another gas type
Caution
Only a fully trained, qualified professional may carry out the
following operations.
The boiler is pre-set in the factory to run on natural gas H (G20).
Conversion kits are available for other types of gas G25 and G31.
1. Close the mains gas valve.
2. Remove the pipe connecting the Venturi to the gas valve.
Tab.38 Connection differences
Reference
Model
A
SIRIUS THREE FS 50
B
SIRIUS THREE FS 70
SIRIUS THREE FS 90
SIRIUS THREE FS 110
Fig.69
Removing the connection pipe
MW
-3
0
0
0
0
4
8
-0
2
A
2
2
B
7 Commissioning
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