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I had new radiators put in yesterday which involved new copper pipe (but just around the rads as majority of pipe being reused) They were meant to be doing a flush of the system. What they did was to fill it up last night, leave it until today and then they connected a drain to one downstairs radiator and opened the filling loop a bit.
Will that work? We’ve micro bore with a manifold. I kinda expected it to all be drained and refilled.
No pumping of the water as the new boiler was only wired up today.
Guess I’m most worried about stuff being left that causes corrosion rather than debris as there’s a filter been put in.
IANAP
If they have replaced radiators and the flow and return copper pipes leading to and from each radiator, they would have had to have drained the system. If they just replaced the rads, then it’s possible to remove without too much water loss by closing the lock shield and trv, although that way is prone to risk of blackened radiator/heating system loop water escaping all over your beige carpets. Not a good look.
I would imagine they used water pressure via the filling loop to refill and flush the system, with the water draining via the hose connected to the lowest radiator.
You say they opened the filling loop ‘a bit’. Time wise? Or just cracked the tap open a bit?
Did you observe the water being discharged from the hose drain?
Either way, probably best to trust them, perhaps ask what inhibitor they will be adding.
Without knowing exactly what they've done I'd guess that they put a cleanser in the filter housing yesterday and left to soak. Not that it will have done much good if the heating wasn't circulating. Draining the system while filling from the loop is better than nothing, but it'll only really flush anything where the water is moving, so maybe not every bit of the new system. You really want to get as much of the flux used for soldering the copper pipes as possible; it's this that causes the corrosion. So while what they're doing isn't ideal, it's not a disaster waiting to happen as long as you make sure they put some inhibitor in the system before they leave for good. Having said that, if I was installing new radiators I'd make sure it was cleaned, flushed and inhibited correctly as part of the job. The fact they don't appear to be doing this should be something to have a chat with them about at least. For info, the debris you get in the filter is the corrosion from the system, so in theory as long as there's inhibitor in the system you should be good as long as the filter is cleaned out when required.
Ta. From what I can make of it they drained the system fully. Removed all the rads.
Then re plumbed new reads and new flow and return for boiler in a new place.
Then put some flush agent in the filter (on the return next to the boiler). Then filled the system via filling loop which is also on return loop.
Then next morning so maybe 16 hours later they opened. The filling loop whilst at the same time draining from rad.