9.3
Venting the system
Any air in the boiler, the pipes or the valves must be removed in order to
prevent unwanted noises that may occur during heating or when tapping
water. To do this, proceed as follows:
1. Open the valves of all the radiators connected to the system.
2. Set the room thermostat to the highest possible temperature.
3. Wait until the radiators are warm.
4. Switch off the boiler.
5. Wait approximately 10 minutes, until the radiators feel cold.
6. Vent the radiators. Work from the lowest to the highest.
7. Open the venting valve with the bleed key, keeping a cloth pressed
against the vent.
Warning
The water may still be hot.
8. Wait until water comes out of the venting valve and then close the
venting valve.
9. Turn on the boiler.
A 3-minute venting cycle is performed automatically.
10. After venting, check that the water pressure in the system is still
adequate. If necessary, top up the water level in the heating system
11. Adjust the room thermostat or temperature control.
Fig.51
Venting the system
AD-3000484-B
8
7
A
C
B
6
5
4
3
2
1
2
3
4
1
11
9 Maintenance
7719764 - v02 - 16112018
EFU-S
35
