6.3
Venting the installation
If any air is present in the appliance or system it must be removed in order
to prevent nuisance noises that may occur during heating or when drawing
off hot water. 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 and
any timers to ‘ON’.
3. Wait until the radiators are warm.
4. Switch off the boiler.
5. Vent the radiators. Work from the lowest radiator in the property.
6. Open the bleed vent with the key, keeping a cloth pressed against
the vent.
7. Wait until water comes out of the bleed vent and then close.
Warning
The CH water in the radiators will still be hot.
8. Switch the boiler on.
9. After venting, check that the water pressure in the system is still ad
equate.
Important
If the water pressure is lower than 0.7 bar, the water must be top
ped up. If necessary repressurise the system (recommended
pressure between 1 and 1.5 bar when cold).
10. Reset the room thermostat to the desired temperature.
The purpose of the function is to remove as much air as possible from the
heating system.
1. Turn off the power to the boiler and rotate the CH control knob fully
anticlockwise.
2. Turn on the power to the boiler. The display shows "000" .
3. Turn the CH control knob ( )
1
/
4
turn clockwise twice in quick suc
cession (within 2 seconds).
4. Display shows "312" while de-aeration is taking place (approximately
7 minutes).
5. When de-aeration has completed, the display will show the primary
flow temperature and the CH ( ) symbols.
Fig.10
Venting the radiators
7
6
A
C
B
5
4
3
2
1
2
3
4
1
10
PN-0000468
Fig.11
Enabling de-aeration function
R
Reset
bar
0
1
2
3
4
Min
M
a
x
M
a
x
Min
R
M
a
x
Min
R
x 2
PN-0000392
6 Maintenance
7678872 - Draft A - 22052017
19
