New radiator in loft causing problems

[SafeGasInstall]

You have let the air out have you ?

 

[Stevemarch1969]

You have let the air out have you ?

Loft rad rad has water coming out when I bleed it if that's what you mean?

 

[Stevemarch1969]

Sounds like it is definitely piped wrong, lots of possibilities as to what he has done. Best thing is to get him to do it again from scratch, there will be no need for any non return valves when pipes correctly.

its weird because flow is from ch side of 3 port so assumed correct.

The only thing "wrong" I suppose is that the loft rad return is teed into the cylinder return.

Maybe as someone else has said the only way to resolve is to make the loft rad return enter the ch return system somehow and not the cylinder retUrn which will prove difficult.

i may just get the NRV removed and go back to how it was. Not ideal but at least the rad worked (even if it seemed to be filled from the retUrn of cylinder and the HW was on constantly as it was filling the rads as well as the cylinder!). But if I use the Trv in the loft effectively hopefully this will stop.
steve

 

[SafeGasInstall]

Post photos

 

[Stevemarch1969]

Flow pipe is upper one teed from ch side of 3 port valve.this goes to lock shield on right of rad.


return pipe is lower pipe with NRV fitted and teed into return pipe which comes from the HW cylinder to the right. This goes to Trv on left of rad.

 

[SafeGasInstall]

Post few more photos to the right hand side whet 3 port and cylinder is

 

[Best]

It seems simple enough. The plumber has made a stupid mistake, if I am picturing it right.
As you have said, the return to the cylinder is where he went wrong. That shouldn't be joined into for the rad unless you also joined the flow to the hot water flow & at least the rad would work when hot water only on & not effect the other rads.
What is happening at moment when only hot water on, is the flow is going through cylinder coil & then out through the return pipe the plumber has wrongly connected - then through the rad & into the flow he connected to the main rad circuit.
Simple! And it really just is the usual mistake - 2 connections to the main return circuit instead of just one!

 

[Stevemarch1969]

 

[Stevemarch1969]

 

[Stevemarch1969]

It seems simple enough. The plumber has made a stupid mistake, if I am picturing it right.
As you have said, the return to the cylinder is where he went wrong. That shouldn't be joined into for the rad unless you also joined the flow to the hot water flow & at least the rad would work when hot water only on & not effect the other rads.
What is happening at moment when only hot water on, is the flow is going through cylinder coil & then out through the return pipe the plumber has wrongly connected - then through the rad & into the flow he connected to the main rad circuit.
Simple! And it really just is the usual mistake - 2 connections to the main return circuit instead of just one!

Thanks for reply.

that makes perfect sense the only weird thing is the flow pipe to the loft rad does not get hot when water on, return does but is prevented from entering rad due to NRV fitted. Something is happening though cause if Trv switched off on loft rad, other rads do not get warm when HW only on. Trv on, other rads get hot.