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Hi,

Interleaved was mention in a question:

A) all combine into two separate pipes, before joining together in a single place and flowing into the return pipe visible, or
B) are they interleaved so some (but not all) upstairs pipes are combined with some (or all) the downstairs pipes, and the remaining upstairs pipes combine later in the run?

The answer from the plumber was B.
He suggested one way values on each radiator, but people have suggested this is a botch job. So I’ve asked him to pipe it as per A above. Hopefully this should resolve the issue. Anyone think different before they start tomorrow? Sounds silly having to ask when I have the plumber, but I’ve been messed about so much. Appreciate everyone’s input!
Re-reading your original post, the problem is one set of rads getting hot when the other set is calling. A more common problem is rads getting hot when DHW calling. But if it's piped as attached sketch that could give your symptoms. From the photos posted I don't think it's possible to be sure it isn't. The fault could be remote from the boiler room.
A schematic of the complete system would be useful, but might need a bit of investigation.
upload_2018-6-6_17-2-27.jpeg
 
Please don't spam the forum with links
sure - I only posted it once but I assume it's been entered into the "swear words" list ;) now someone has deleted all the links - it's a relevant information regarding this thread so it should be linked somewhere.
I assume the worry is that everyone will like there more than here and stop visiting, but I doubt there's any risk of that from what I've seen.
 
sure - I only posted it once but I assume it's been entered into the "swear words" list ;) now someone has deleted all the links - it's a relevant information regarding this thread so it should be linked somewhere.
I assume the worry is that everyone will like there more than here and stop visiting, but I doubt there's any risk of that from what I've seen.

Yea me, all the links were broken due to the forums policy on advertising other forums
 
Sounds like the person who first fixed the pipe work is inexperienced or under qualified. If this is a med to large house builder ask for a copy of the mechanical drawings. Should have pipe work routes and design.

Don't let them fit single checks, they will fail at some point.
 
Hi If you have any questions about advertising on the forums, please pm me.
 
Hi,
I'm looking for a little help. I bought a new build and have heating issues since we moved in. The builder wants the installer to resolve the issues, but hes been back now about 5 times and still the issue persists. I was hoping for a little advice. We have 2 circuits 1 upstairs and 1 downstairs. When the downstairs is on the rads upstairs start getting hot one by one via the return. Whats the best way to get to identify whats causing the issue. Is this issue generally caused by the way the pipes have been run i.e. 22mm to microbore or is it generally the pipework around the boiler. I'm reluctant to pay someone to resolve it, as its the builders responsibility but the plumber the builder keeps sending (the installer) is not fixings the problem and seems to not be able to identify the issue either. Any help or direction would be greatly appreciated.
Any developments on this? I'm sure I'm not the only one interested!
 
Hi all,

Sorry for the delay in responding. The plumber has now run a second return so the upstairs and downstairs returns now have there own returns and these then combine together to go back to the boiler. However the problem persists with the upstairs still heating up via returns when downstairs heating is on. I’m not sure if he had a clue what the issue is. He’s also altered the pipe work around the boiler, bit to no avail.
 
Hi all,

Sorry for the delay in responding. The plumber has now run a second return so the upstairs and downstairs returns now have there own returns and these then combine together to go back to the boiler. However the problem persists with the upstairs still heating up via returns when downstairs heating is on. I’m not sure if he had a clue what the issue is. He’s also altered the pipe work around the boiler, bit to no avail.
I still think we need a schematic of the complete system, to check that it isn't piped (wrongly) as my #36. But that might not be easy to do, if the pipes and connection points are mostly out of sight. I suppose the house is complete and habitable, floorboards down etc? It would be good if installers did as-built drawings, but I don't suppose most of them do.
 
Sorry I meant to say he moved the pipe under boiler its the last t on the return now. I think its the Bypass but not sure.
 
should there not be a non return valve on the return as the return from cylinder where it tees in could go either way. just a thought
 
Sorry I meant to say he moved the pipe under boiler its the last t on the return now. I think its the Bypass but not sure.
The more common problem, rads getting on when HW called, due to rads returns not all being commoned before the cylinder return joins, has been avoided.
But you could still have the problem you describe if it's piped as my #36. If the zone valve feeding the top rads is closed, the other one open, the top rads will get warm, I showed the flow path. It only happens because you have zone valves. If just one auto valve fed all the rads, with TRVs to control temperature in different areas, it wouldn't happen.
 
Just had my first look at the photo of the updated pipework. I can't see anything major now wrong with the heating system pipes.
The cylinder tee in last on return, as you would expect.
(There can be some heat gravitating on a return where it keeps rising, like in the photo, if it has a path)
Only thing I can think of is there are more than one main tee off to a zone causing a loop going to the On zone.
But I need to think on it sometime I get time
 
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