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9. Attach the tube to the filling/draw-off valve. Firmly tighten the nut
on the filling tube.
10.Open the filling/draw-off valve on the heating system.
11.Open the running water tap.
12.Check the water pressure in the installation shown on the control
panel display.
13.Close the water tap when the water pressure reaches 2 bar.
14.Close the filling/draw-off valve on the heating system. Leave the
tube on the filling/draw-off valve until the air is purged from the
installation.
When water is added, air gets into the heating system.
Degas the installation. After the air has been vented, the
water pressure can drop below the required level. Check
the water pressure in the installation shown on the control
panel display. If the water pressure is lower than 0,8 bar,
more water should be added.
15.After filling the installation, switch the boiler on.
6.4 Bleeding the heating system
It is essential that any air in the boiler, pipes or fittings is bled to
prevent noises to occur during heating or water draw-off. To do this,
proceed as follows:
1. Open the valves on all radiators connected to the heating system.
2. Set the heating set point to as high a temperature as possible.
3. Wait until the radiators are hot.
4. Switch the boiler off.
5. Wait around 10 minutes until the radiators are cold.
C003837-A
C003838-A
1
2
3
4
T000181-B
T000184-A
T000185-A
6. Checking and maintenance
AFC 18 - AFC 24 - AFC 30
31
15/07/2015 - 300026440-05
32


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