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Post by wingnut on Jan 28, 2019 22:52:28 GMT
Hello all
So let me set the scene for you
I’ve a Baxi 105he that’s roughly 13 years old , I’ve recently swapped out some single panel to double panel rads and here’s where the problems began, since swapping out the rads I’ve experienced hot at top and cool at bottom on some of the rads.
I’ve flushed the system with mains water by disconnecting flow and return from boiler and pushing it round the system, all went well until I got to the bedroom rad, all other rads shut and no return flow, took rad off wall no crud in rad, opened trv water flew out, opened lockshield water trickled out (this rad has been problematic since changed for a double).
Any ideas?
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Post by tomplum on Jan 28, 2019 22:59:21 GMT
firstly welcome to the brewcabin wingnut,
I would say the lockshield valve is blocked, or the pipe is, So change the lock shield and try again,
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Post by crowsfoot on Jan 29, 2019 7:12:21 GMT
I'm in agreement with tom to swop the lockshield valve - plus as it's been so much trouble it may be a good idea to replace the tee that feeds it as well it's not unknown for a blockage here.
Double radiators will struggle to get hot on an old fashioned one pipe system though - it's not an old one piper is it?
Welcome to the forum wingnut.
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Post by wingnut on Jan 29, 2019 8:40:39 GMT
Thanks for your reply’s, how would I know if it’s a onepiper as the ch was already installed when we moved in
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Post by tomplum on Jan 29, 2019 12:46:28 GMT
a one pipe system is where the flow and return are connected to the same pipe,  its very rare in houses but there are many about, |
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Post by wingnut on Jan 29, 2019 13:09:25 GMT
a one pipe system is where the flow and return are connected to the same pipe, View Attachmentits very rare in houses but there are many about, To be honest I’m not sure if it’s a single pipe or not, it seems that the upstairs tee off to downstairs as they are more or less on top of each other if that’s any use |
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Post by tomplum on Jan 29, 2019 15:47:37 GMT
photos will help us better wingnut, to add a photo use the add attachment here--------------------------------------------------------------------^^^^ edit, the attachment is on replys only,  |
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Post by wingnut on Jan 29, 2019 15:51:05 GMT
photos will help us better wingnut, to add a photo use the add attachment here--------------------------------------------------------------------^^^^ edit, the attachment is on replys only, I don’t really think photos would help as all pipes are either sunk into walls or under floor boards, all I’d be able to show is where the flow and return go into the wall 😔 |
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Post by rocketmanbkk on Jan 29, 2019 16:47:21 GMT
a one pipe system is where the flow and return are connected to the same pipe, View Attachmentits very rare in houses but there are many about, I was at a one pipe system with my mate last Friday, big house, old system. Rads not getting hot. My question is from the diagram, I understand it’s like a daisy chain, water flows one rad to the next. Why is there a bottom glow pipe? If you were to remove that bottom pipe so the flow could only go from rad to rad would it work? I assume the last rads on the system may not get as hot as the first rads. Cheers all |
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Post by tomplum on Jan 29, 2019 19:40:43 GMT
the bottom pipe is the one pipe going from the boiler and round the rads then back to the boiler, if it was't there you shut any radiator and the whole systen goes off, and yes rocky, the first rad gets all the heat if you don't turn the valves down,
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Post by wingnut on Jan 29, 2019 19:54:58 GMT
the bottom pipe is the one pipe going from the boiler and round the rads then back to the boiler, if it was't there you shut any radiator and the whole systen goes off, and yes rocky, the first rad gets all the heat if you don't turn the valves down, That’s very similar to my system however when I was running water through it at the weekend with all rads shut bar the bathroom I was getting flu and return, shut bathroom, open 1st bedroom all ok, shut 1st bedroom and open 2nd bedroom return stopped completely. |
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Post by rocketmanbkk on Jan 29, 2019 19:58:57 GMT
the bottom pipe is the one pipe going from the boiler and round the rads then back to the boiler, if it was't there you shut any radiator and the whole systen goes off, and yes rocky, the first rad gets all the heat if you don't turn the valves down, Yeah so it’s a crap system then really I understand that now Cheers Tom Learnt something then |
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Post by crowsfoot on Jan 29, 2019 20:23:04 GMT
All the first domestic central heating systems were one pipers usually done in the 60s so they are very old systems these days.
If done right they work well, but they were very often not.
Dev's on the screwfix forum has a part one pipe system/ part two pipes in his house, which leaves me speechless...yet he claims it works! They where many plumbers experiments with heating systems in the 70s!
It was just that double radiators don't work very good on them and if wingnut had swoped his singles for doubles and they now don't work the pieces do fit together if it was a one piper.
I now think it's a two pipe system that wingnut has now though - so I'd replace that lockshield valve and for a bit of extra security whilst it's drained replace the tee going to that lockshield valve as well.
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Post by dickpuller on Jan 29, 2019 20:30:36 GMT
the bottom pipe is the one pipe going from the boiler and round the rads then back to the boiler, if it was't there you shut any radiator and the whole systen goes off, and yes rocky, the first rad gets all the heat if you don't turn the valves down, That’s very similar to my system however when I was running water through it at the weekend with all rads shut bar the bathroom I was getting flu and return, shut bathroom, open 1st bedroom all ok, shut 1st bedroom and open 2nd bedroom return stopped completely. If you have a one pipe system WN, have you fitted new TRVs? You need special TRVs for one pipe matey👍👍 |
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Post by wingnut on Jan 29, 2019 20:32:10 GMT
All the first domestic central heating systems were one pipers usually done in the 60s so they are very old systems these days. If done right they work well, but they were very often not. Dev's on the screwfix forum has a part one pipe system/ part two pipes in his house, which leaves me speechless...yet he claims it works! They where many plumbers experiments with heating systems in the 70s! It was just that double radiators don't work very good on them and if wingnut had swoped his singles for doubles and they now don't work the pieces do fit together if it was a one piper. I now think it's a two pipe system that wingnut has now though - so I'd replace that lockshield valve and for a bit of extra security whilst it's drained replace the tee going to that lockshield valve as well. I’ll give it a go at the weekend 👍👍👍 |
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