Sorry I dont know YOUR boiler, HOWEVER I expect it will have a filling loop underneath - maybe boxed in.
Look for a flexible tube (loop) often silver in appearance. It will have a valve at each end (or maybe just one). Open them to allow water into the system while you WATCH the pressure rise. Raise to 1 - 1.5 bar & shut valve(s) again.
Steve
March 2008
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