There will be a grey plastic tap next to the fill point key, open that whilst keeping an eye on the pressure, get to about 1bar, then turn the tap back off.
The key is a bayonet fitting (similar to a light bulb), twist it to the correct position and it will be able to be pulled out.
Better to have the heating off whilst re-filling, the pressure will be correctly measured when heating is cold as it willl rise when heating is on.
Carefree
February 2011
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