Okay, sorry if this seems to be a really stupid question but I'm going to remove a radaitor for decorating (which I haven't a problem with). The thing I've been pondering is how does the system top itself up to replace the water lost from the removed radiator. This has made me think after reading the manual to my Boiler where it mentions being a sealed system and cannot find no mention on what to do if any part of the system is interupted. I have an Alpha CB28 combi-boiler by the way, no tanks in the loft or anything, everything's direct from the mains.
Not a daft question, just one you don't know the answer to.
Sealed systems will usually have a filling point called a filling loop. You use this to top up, whilst bleeding the radiator of air. The system pressure usually need to be at 1bar when cold, this is indicated on the boiler pressure gauge usually.
refit rad, open valves, pressurise the system to 1.5-2 bar and close off the filling loop, then bleed rad. keep doing until radiator is full and system pressure is at 1bar or whatever your MI (manufacturers instructions) state.
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