Initial fill of UFH circuits

[Gsysaxman]

HI, we have replaced 3 manifolds (1 upstairs 2 downstairs) with new Warmup units. The installation manual from Warmup states that to fill the system you have to fill each circuit in turn using the fill / drain points on each manifold. However, my plumber said that he always uses the filling loop to quickly fill the whole system, which I don't understand in that won't air remain in the system and affect efficiency and performance if you don't ensure that each circuit and then each manifold is purged of air individually? Thanks.

 

[king of pipes]

Your correct in your interpretation each heating loop needs to be filled individually run a hose to a drain, mains waters is put in travels through the heating loop and pushed out the air once its free running slowly close off the drain point and move to the next one 😉👍. Kop

 

[fowlerboi]

If you're just changing manifolds you shouldn't need to unless your UFH is higher than the manifold is

 

[Gsysaxman]

If you're just changing manifolds you shouldn't need to unless your UFH is higher than the manifold is

thank you for replying, two manifolds on the ground floor and one upstairs so the UFH loops are not higher. Wouldn’t all the circuits have had to be drained to fit the new replacement manifolds, or could the manifolds just be isolated from the primary supply and disconnected leaving the actual circuits still full of water? Many thanks for any clarification.

 

[fowlerboi]

thank you for replying, two manifolds on the ground floor and one upstairs so the UFH loops are not higher. Wouldn’t all the circuits have had to be drained to fit the new replacement manifolds, or could the manifolds just be isolated from the primary supply and disconnected leaving the actual circuits still full of water? Many thanks for any clarification.

I certainly fit mine with isolation valves so wouldn't have had to drain down. Even if you did have to drain everything the water in the UFH pipes can't go uphill and out the manifold so therefore will still be full and no air would have been introduced. The instructions are referring to new installations

 

[king of pipes]

If your upgrading I would flush out the loops ufh can produce bacterial growth over time if this is a issue it usually shows in the discoloration of the flow meters, as I stated earlier flush them through ten add a bioside treatment. Kop

 

[Gsysaxman]

If your upgrading I would flush out the loops ufh can produce bacterial growth over time if this is a issue it usually shows in the discoloration of the flow meters, as I stated earlier flush them through ten add a bioside treatment. Kop

Thank you very much, although I have been told that a turbidity check was done on the system water and was found to be right in the middle so the water quality in the system was good enough to avoid a total drain down. Didn't see the test outcome myself so of course reliant on what I am being told.