9.3
Venting the installation
Any air in the appliance, the pipes or the valves must be removed in order
to prevent annoying noises that may occur during heating or when tapping
water. Proceed as follows:
1. Open the valves of all the radiators connected to the installation.
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 ten minutes, until the radiators feel cold.
6. Vent the radiators. Work from the bottom to the top.
7. Open the venting valve with the bleed key, keeping a cloth pressed
against the vent.
8. Wait until water comes out of the venting valve and then close the
venting valve.
Warning
The central heating water may still be hot.
9. Switch the boiler on.
A three-minute venting cycle is performed automatically.
10. After venting, check that the water pressure in the installation is still
adequate.
Important
If the water pressure is lower than 0.8 bar, the water must be top
ped up. If necessary: top up the central heating installation (rec
ommended water pressure between 1.5 and 2.0 bar).
11. Set the room thermostat or the control.
Fig.47
Venting the installation
AD-3000484-B
8
7
A
C
B
6
5
4
3
2
1
2
3
4
1
11
9 Maintenance
32
EF
7626252 - v02 - 17102016
