ufh zones

[alant]

I have a project coming up where I want to use 2 seperate ufh manifolds with the same boiler. The manifolds would have zone valves on them so would I need to put zone valves in the feeds to each manifold?

ta

alan

 

[mike-c]

http://www.johnguest.com/Home/literature-downloads/UK-Literature/UFH-CAT-0211V-WEB.aspx

Not sure if this will be helpful but it is worth a look.
I am not saying to use this system or make of pipe but it is a quite comprehensive guide to show how the basics of Ufh works.

 

[alant]

Not sure if this will be helpful but it is worth a look.
I am not saying to use this system or make of pipe but it is a quite comprehensive guide to show how the basics of Ufh works.

I have no problem with how ufh works. I have been told I will need to zone the 2 manifolds with 2 port valves but I don't understand why I would need these as the manifolds would have zone valves on them.

ta

alan

 

[mike-c]

You should not need the extra valves as long as the manifold valves are wired back correctly.
(just thought that the link given may have had a bit in it explaining if the extra valves were needed or not).

 

[alant]

You should not need the extra valves as long as the manifold valves are wired back correctly.
(just thought that the link given may have had a bit in it explaining if the extra valves were needed or not).

thanx

 

[DirksPlumbing]

I have no problem with how ufh works. I have been told I will need to zone the 2 manifolds with 2 port valves but I don't understand why I would need these as the manifolds would have zone valves on them.

I think the whole idea of zoning is to determine if the pump/heat source needs operation. If you use separate controllers for the 2 manifolds then you will have two independent demand ports anyway. In this case there should be no need to have additional valves.
In general the circuits/zones of the UFH are sufficient to satisfy the requirement for zoning anyway.

But there are many ways to connect UFH to the boiler. Without knowing the setup it is pretty difficult to say who had specified additional controls and why.

My preferred way is to connect the UFH straight to the boiler and limit the temperature at the boiler if suitable (+safety). These design decisions have to be made before fitting otherwise it can be costly to change.

 

[Cds]

If all the UFH loops have actuators then technically there is no need for any further zone valves. However I have had a number of instances when the actuator and manifold valve have not fully closed against the flow to the manifold and some overheating was experienced. An additional zone valve would have stopped this from happening.

 

[DirksPlumbing]

If all the UFH loops have actuators then technically there is no need for any further zone valves. However I have had a number of instances when the actuator and manifold valve have not fully closed against the flow to the manifold and some overheating was experienced. An additional zone valve would have stopped this from happening.

I have changed plenty of passing 2/3 port valves. Should we then better triple up?