Hi all - great thread, thanks
I currently have a valliant ecofit plus 631 and a fairly standard S plan system with evohome w/hw kit. It all sounds rather straightforward to get it opentherm enabled but I have one outstanding question specific to my setup and wondered if anyone had an idea💡 :
My S plan has 3 valves
1 HW
1 CH Radiators (all rads have HR92s)
1 UHF valve (and pump) for a single large room zone (kitchen diner extension)
If any of the valves orange wires is live (eg open) the boiler is on (firing). Each of these 3 valves are currently controlled via its own BDR.
The first 2 valves are standard evohome HW and CH.
The UFH valve BDR is configured as an electric underfloor heating zone within evohome, paired with its own Y87 on the wall. When the zone drops below Y87 set temp, the BDR fires which starts UFH pump and opens UFH valve which in turn fires the boiler (via orange wire)
So my question is what does my OpenTherm (OT) enabled setup look like? The OT bridge will be wired to boiler and I will disconnect the orange wires feeding the boiler. Evohome should demand the correct flow temps (high for HW and variable for CH demand) but how do I get the UFH zone to be part of this? Ideally I want it controlled via a HR92, then it would be simple (eg whole floor = 1 radiator valve) but that’s not my setup.
Anyone running a similar setup got any advice?
I currently have a valliant ecofit plus 631 and a fairly standard S plan system with evohome w/hw kit. It all sounds rather straightforward to get it opentherm enabled but I have one outstanding question specific to my setup and wondered if anyone had an idea💡 :
My S plan has 3 valves
1 HW
1 CH Radiators (all rads have HR92s)
1 UHF valve (and pump) for a single large room zone (kitchen diner extension)
If any of the valves orange wires is live (eg open) the boiler is on (firing). Each of these 3 valves are currently controlled via its own BDR.
The first 2 valves are standard evohome HW and CH.
The UFH valve BDR is configured as an electric underfloor heating zone within evohome, paired with its own Y87 on the wall. When the zone drops below Y87 set temp, the BDR fires which starts UFH pump and opens UFH valve which in turn fires the boiler (via orange wire)
So my question is what does my OpenTherm (OT) enabled setup look like? The OT bridge will be wired to boiler and I will disconnect the orange wires feeding the boiler. Evohome should demand the correct flow temps (high for HW and variable for CH demand) but how do I get the UFH zone to be part of this? Ideally I want it controlled via a HR92, then it would be simple (eg whole floor = 1 radiator valve) but that’s not my setup.
Anyone running a similar setup got any advice?
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