Potterton SIRIUS THREE FS 70 Installation Manual page 69

Fig.67
A
2
Fig.68 Removing the Venturi unit
B
A
3
Tab.46 Torque load
Reference Model
A SIRIUS THREE FS 50
B SIRIUS THREE FS 70
SIRIUS THREE FS 90
SIRIUS THREE FS 110
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B
2
3
2. Remove the pipe connecting the Venturi to the gas valve.
Tab.45 Connection pipe
Reference
A
B
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
Fastening Venturi end
Clip
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 66
Setting the air/gas ratio (reduced heat input), page 63
Setting the air/gas ratio (maximum heat input), page 62
Model
SIRIUS THREE FS 50
SIRIUS THREE FS 70
SIRIUS THREE FS 90
SIRIUS THREE FS 110
Fastening gas valve end
G1" nut, torque: 40 N·m
Nut, Torque: 40 N·m
8 Commissioning
69