Remounting The Burner; Thermal Fuse In The Heat Exchanger; Check The Combustion - Potterton SIRIUS THREE FS 70 Installation Manual

Fig.125
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7609493 - v11 - 18052020
11. Remount the burner.
11.2.6
1. Remount the pipe connecting the gas valve to the Venturi unit.
2. Remount the burner, the Venturi and the fan.
3. Reconnect the ignition electrode, the safety thermostat on the
4. Open all valves.
5. Check the tightness of the burner using a leak detection spray.
6. Put the covers back in place on the boiler.
7. Reconnect the earth wire.
8. Re-commission the boiler.
11.2.7
The thermal fuse is located in the rear part of the heat exchanger and is
connected in series to the safety thermostat.
The function of the thermal fuse is to ensure the protection of the heat
exchanger against the danger of overheating if the insulation malfunctions.
Intervention by the device is signalled by the on-screen display of the
anomaly 110:Lockout SLT.
2
1
11.2.8
1. Check the combustion with maximum heat input.
For more information, see
Removing the burner, page 103
Accessing the internal boiler components, page 43
Remounting the burner, page 107

Remounting the burner

Important
Do not forget to remount the igniter on the burner.
Caution
Respect the torque on the burner fastening nuts: 5 N.m +/- 0.5.
Caution
Always use a new tightness gasket to reconnect the gas supply.
combustion chamber door and the flame detection sensor.
Important
For the SIRIUS THREE FS 50 and SIRIUS THREE FS 70 models,
put the panel located in front of the burner back in place.
For more information, see
Commissioning procedure, page 59

Thermal fuse in the heat exchanger

1 Rear of the heat exchanger
2 Thermal fuse
Important
When replacing the thermal fuse, also replace the insulating
surface inside the heat exchanger. This insulating surface has
been damaged by overheating.
For more information, see
Removing the burner, page 103

Check the combustion

Checking combustion (maximum heat input)
11 Maintenance
107