3. Remove the Venturi unit.
4. Replace the original Venturi unit with the Venturi unit provided in the
conversion kit.
5. Remount the connection pipe to the gas valve.
Tab.39 Torque load
Reference
Model
Fastening Venturi end
Fastening gas valve end
A
SIRIUS THREE FS 50
Clip
G1” nut, torque: 40 N·m
B
SIRIUS THREE FS 70
SIRIUS THREE FS 90
SIRIUS THREE FS 110
Nut, Torque: 40 N·m
Nut, Torque: 40 N·m
6. Open the mains gas valve.
7. Check the tightness of the assembly and ensure that there are no
leaks.
8. Set the gas valve according to the parameters given in the conversion
kit manual.
9. Set the fan speed according to the new gas type.
10. Set the air/gas ratio.
11. Replace the gas setting label with the one delivered with the boiler
and tick the corresponding gas setting.
For more information, see
CO2 checking and setting values, page 61
Setting the air/gas ratio (reduced heat input), page 60
Setting the air/gas ratio (maximum heat input), page 59
7.5
Configuring the system
7.5.1
Configuring an installation with 1 1 low-loss
1 direct c 1 underfloor heating c 1
domestic hot water tank
1. Access the installer parameters
2. Set the following parameters on the boiler:
Tab.40 Boiler settings
Parameter number
Parameter
Setting
5715
Temps / mode CH2
On
6020
Function extension module 1
Temps / mode CH2
6024
Funct input EX21 module 1
Limit thermostat CH
Fig.70
Removing the Venturi unit
MW
-3
0
0
0
0
4
9
-0
2
A
B
3
3
7 Commissioning
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