With the Boiler Cold, you should fill the system using the filling loop to 1-00 Bar. once this pressure is reached be sure to turn off the filling loop securely.
You will notice that when the system heats up, the pressure will rise to anything up to 2-00 Bar, this is normal.
One more point to remember, if you bleed any of the Radiators, you will need to re-pressurise the system using the above method.
Hope this helps
www.elanar.co.uk, June 2009
