UK UFH Manifold question

[LostinFrance]

Hi all, we bought a house 3 years ago that has underfloor heating on the ground floor but the way it has been installed does not seem to conform to any of the accepted standard. It has a newish oil boiler that is running the UFH temp at 75 (yes I know that is too high) but the floor still remains tepid at best. It is an Uponor manifold and I have just changed the valves and flow meters and flushed and vented the circuits (there are 9 circuits). No change still tepid. However, I am wondering if the flow and return are set up correctly. The flow meters are on the bottom manifold and the valves on the top one. When starting up, the top manifold gets warm first. I know that normally, the flow meters are on the top. How can I confirm if they are the right way around please? I could easily swap them about and re-vent the system. The pump is not on the manifold but in the airing cupboard, it's all a bit weird but I am starting by sorting out the correct flow and return on the manifold. Can anyone help please? Thanks... Rob

 

[Last Plumber]

Hi all, we bought a house 3 years ago that has underfloor heating on the ground floor but the way it has been installed does not seem to conform to any of the accepted standard. It has a newish oil boiler that is running the UFH temp at 75 (yes I know that is too high) but the floor still remains tepid at best. It is an Uponor manifold and I have just changed the valves and flow meters and flushed and vented the circuits (there are 9 circuits). No change still tepid. However, I am wondering if the flow and return are set up correctly. The flow meters are on the bottom manifold and the valves on the top one. When starting up, the top manifold gets warm first. I know that normally, the flow meters are on the top. How can I confirm if they are the right way around please? I could easily swap them about and re-vent the system. The pump is not on the manifold but in the airing cupboard, it's all a bit weird but I am starting by sorting out the correct flow and return on the manifold. Can anyone help please? Thanks... Rob

It might be best if you can post a few photo's of the installation?
Sometimes it helps when you've seen it.

 

[LostinFrance]

It might be best if you can post a few photo's of the installation?
Sometimes it helps when you've seen it.

Thanks, yes, here we are. You can see the manifold and then the pump and the thermohead centre is in the airing cupboard which is about 40 feet away from the manifold on the ground floor. I have now replaced the valves, flow meters and the thermoheads with new Oponor ones (expensive) but although the manifold and all the pipes are hot, the rooms are still tepid. The pump is going on max but I don't know what to do with that manual mixer valve underneath it.