single pipe central heating systems

alanmakinson · 15 May 2006

I have put towel radiator on a single pipe central heating system and it does not work. i have connected one pipe to the base of the radiator and one pipe to comes out vertically at the top of the radiator then bends 90 degrees then another 90 degrres and then down vertically and back into the single pipe. I also put to cut off valves at on each ipe just after they tee off the single pipe so i could remove the radiatore easily if required.

anyone any ideas how to make it work

HarrogateGas · 15 May 2006

I would suggest to rethink your pipe runs, those two 90 bends are a balck spot for airlocks. i suggest this may be part of your problem.

jobloggs · 15 May 2006

No experience of this type of system but logic suggests that resistance to flow along the main pipe is so low compared to that through the rad and the contorted return that the water prefers to flow via the main pipe. (I'm assuming that air in the rad is not the problem.)

Are you getting any heat at all into the radiator?

Why do you not take the return down from the bottom of the rad at the other end?

If you could restrict flow in main pipe by introducing a valve then you might be able to induce enough water to flow through the radiator by balancing the flows.

alanmakinson · 15 May 2006

the radiator is cold. wondered if it would work if i repipe them both from the bottom.

doitall · 15 May 2006

Stick an email in your profile or send me an email and i'll knock up a drawing

alanmakinson · 15 May 2006

i have put my email in the profile not sure how to accees your e-mail address

Thanks

Gasguru · 15 May 2006

Get rid of the "cut-off valves"

Make sure the radiator valves are suitable for one pipe systems.

Make sure the new pipes to the radiator are of sufficient size.

Normal TRV's are not suitable for one pipe systems - too restrictive.

Make sure the system is balanced.

On one pipe systems the radiators work by convection currents flowing from the one pipe and around the radiator (ie completely different to two pipe systems).

Nige F · 16 May 2006

Bottom tappings, no valves...........22mm pipe

recall · 16 Oct 2011

did you used sweeped tees?

simond · 16 Oct 2011

I trust the two pipes coming off the one pipe are tee'd in a fair distance apart? 600mm would be good.

Too close together and you will get no flow.

The advice re non restrictive (or better still, only one) radiator valves is good.

gas112 · 17 Oct 2011

5 Year old post probaby sorted by now

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single pipe central heating systems

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