10 Maintenance
Combi 2
69
Fig.81
Remove flow regulator and filter
10.4.4
Replacing the return valve
To replace the return valve, proceed as follows:
1.
Disconnect the power supply to the boiler;
2.
Close the gas cock;
3.
Cut off the gas supply to the boiler.
4.
Close the heating system return and flow cocks.
5.
Drain the system, if possible only the boiler, using the specific drain
cock.
6.
Empty the water from the domestic water circuit by opening a user
cock.
7.
Disconnect any piping connections.
8.
Remove the hall effect sensor (1).
9.
Remove the clip (2).
10.
Disconnect the pump (3).
11.
Remove the fastener (4).
12.
Remove the valve from the heat exchanger (5).
13.
To re-assemble, perform the above actions in reverse order.
Fig.82
Remove 3-way valve
Fig.83
Remove pressure sensor
10.4.5
Replacing the 3-way valve
To replace the diverter valve, proceed as follows:
1.
Disconnect the power supply to the boiler;
2.
Close the gas cock;
3.
Cut off the gas supply to the boiler.
4.
Close the heating system return and flow cocks.
5.
Drain the system, if possible only the boiler, using the specific drain
cock.
6.
Empty the water from the domestic water circuit by opening a user
cock.
7.
Disconnect any piping connections.
8.
Remove the pressure sensor as per 10.4.6.
9.
Remove the safety pressure relief valve as per 10.4.8.
10.
Remove the diverter valve motor as per 10.4.9
11.
Remove the screw (1).
12.
To re-assemble, perform the above actions in reverse order.
10.4.6
Replacing the pressure sensor
1.
Disconnect the power supply to the boiler;
2.
Close the gas cock;
3.
Cut off the gas supply to the boiler.
4.
Close the heating system return and flow cocks.
5.
Drain the system, if possible only the boiler, using the specific
drain cock.
6.
Empty the water from the domestic water circuit by opening a user
cock.
7.
Remove the clip (1)
8.
Remove the pressure sensor (2).
9.
Reassemble in reverse order with the new pressure gauge.
