Single pipe system problem

[mumbles]

Hi
I have replaced 2 radiators on my single pipe gravity fed system and now only the first 4 of our radiators are hot the other 6 are cold. We have drained the air out of the radiators but they are still cold.
Any suggestions please
Thanks in advance

 

[Razor900]

Have you tried turning off the working rads?

 

[muggles]

Have you tried turning off the working rads?

It's a one-pipe system dummy, if you turn a rad off the whole system stops working.


OP: Are you sure the valves are open? Try opening them right up to start with

 

[swidders]

Have you tried turning off the working rads?

It's a one-pipe system dummy, if you turn a rad off the whole system stops working.

Not true - rads come off as spurs to the single pipe run. Closing them off will mean water circulates the ring without diverting into any rad.

Balancing is the key.

 

[Razor900]

Have you tried turning off the working rads?

It's a one-pipe system dummy, if you turn a rad off the whole system stops working.


OP: Are you sure the valves are open? Try opening them right up to start with[/quote


What a tool ]

 

[doitall]

Have you tried turning off the working rads?

It's a one-pipe system dummy, if you turn a rad off the whole system stops working.

Classic muggles Just sometimes it's best not to say anything

What did you do when you swapped the radiators over, fit TRVs perhaps.

How many loops, all one or two.

 

[mumbles]

Hi
We have tried switching the working rads off but not much success, the warmth has moved a little along the pipe but the radiators are still cold.

I did indeed put 2 TVR's on the new rads, one loop.

Thanks

 

[swidders]

Hi
We have tried switching the working rads off but not much success, the warmth has moved a little along the pipe but the radiators are still cold.

I did indeed put 2 TVR's on the new rads, one loop.

Thanks

TRV's not suited for one pipe systems - you need to ensure a constant flow. Take the thermostatic heads off and see if that improves things

 

[doitall]

Hi
We have tried switching the working rads off but not much success, the warmth has moved a little along the pipe but the radiators are still cold.

I did indeed put 2 TVR's on the new rads, one loop.

Thanks

TRV's not suited for one pipe systems - you need to ensure a constant flow. Take the thermostatic heads off and see if that improves things

Not so swidders.

Standard TRV's are not suitable for one pipe systems, unless you have used the correct valve it will never work.

You need the special one pipe TRV, around £40 each.

 

[Bambergaspipe]

Full bore TRV`s.

 

[Biggles..]

The ones we use arent full bore they're a standard valve from the manufacturers range but its the operating characteristics of the heads that need to be chosen for differnt applications.

The ones we use for a one pipe offer different temp response and do not mechanical or thermostically lock down.

 

[swidders]

TRV's not suited for one pipe systems - you need to ensure a constant flow. Take the thermostatic heads off and see if that improves things

Not so swidders.

Standard TRV's are not suitable for one pipe systems, unless you have used the correct valve it will never work.

You need the special one pipe TRV, around £40 each.

Once again - a hole in my knowledge base filled. Thank you, Bamber and lcg for the info.

 

[mumbles]

Hi
Thanks you for the info I will take the tops off the TVR's to change them to a regular valve and see if that helps.
Cheers

 

[doitall]

Hi
Thanks you for the info I will take the tops off the TVR's to change them to a regular valve and see if that helps.
Cheers

Won't make any difference, if you have fitted normal TRV's then they have to go.

Post the make/model.