7.3 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 air is difficult to remove, it is possible to manually de-aerate
the boiler and system using the control panel. Press and hold the
RESET button for approximately 5 seconds and release to start
the process. The display will show dAF briefly and then t.17 to in
dicate that the process has started. The de-aeration will last for
approximately 5 minutes then the control panel will revert to its
normal display.
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.
Fig.14 Venting the radiators
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