Servicing UFH

[MrSniff]

Looking at our UFH system I suspect it has not been looked after so well in the past, so at a minimum I guess I need to check the pressure, bleed and top up as necessary. The entire circuit from the heat exchanger is in plastic (apart from the manifolds obviously), so running a cleaner through the system and then adding inhibitor seems unnecessary: is this a false assumption? Heat is provided by a district heating system.

 

On the subject of bleeding, I think the knurled bit on the top of each rail on the right is a bleed valve, but before I undo something I may regret does that seem likely?

 

Is there anything else I should consider?

 

Many thanks

Ian