Central Heaing System?
I have depleted the central heating system and drained off every radiator panels in the house..took them out and flushed cleaned them all...now I am ready to fit them back in place and refill the system. Mine is a combi boiler does not have a head tank in the loft but relying on the pressure gauge at the top of the boiler. My question is ...What is the best way pf refilling the system? should I leave one of the radiator vent screw off ..if so which one?...upstairs one or down stairs one? How do I keep an eye on the pressure gauge while watching the open vent radiator for over flow? Any advice would be appreciated, thanks.
Comments
That sounds quite simple to me. Reconnect all radiators but leave the valves on each radiator closed. Crack open the inlet make-up valve at the boiler, then go to the first ground floor radiator. Open the inlet valve and the purge valve until water comes continually from the purge (ie doesn't splutter). Close the purge and check for leaks before going to the next radiator.
Do the same to each radiator on the ground floor then start upstairs. You may want to open the boiler make-up valve a bit more if this seems a bit slow. Since you're continually purging, the pressure in the circuit should not rise much. When you've covered all the radiators go back down to the boiler and shut the make up valve. Leave the pressure to stabilise a short while. Even with the make-up shut you'll probably have .3 to .5 bars pressure (4.5 to 7.5 psi) just due to the column of water in the system.
Open the make-up and pressurise to the normal pressure, say twice that value and turn off the make-up valve again.
Then go round the house to clear any residual air there may still be trapped in the system. Top up again if necessary and that should finish the job.
Basic rules, don't try and go faster than that, use the valves on the inlet of each radiator to do things in the order you've decided, and lastly start at the bottom of the house and work up.
Off you go and the best of luck. Hope you don't have too many leaks.