Lets start with a standard S Plan evohome system.
One BDR91 is bound as a Hot Water controller. This is triggered whenever the evohome needs HW. The BDR91 triggers the HW zone valve which in turn fires the boiler. The other BDR91 is bound as a System Device in Boiler Demand Relay. This is triggered whenever any radiator needs heat. The BDR91 triggers the CH zone valve which in turn fires the boiler.
So far so good?
Now when I add OpenTherm to this. How do things change?
I didn't think I could use both an Opentherm bridge as well as a Boiler Relay for Boiler Demand?
One BDR91 is bound as a Hot Water controller. This is triggered whenever the evohome needs HW. The BDR91 triggers the HW zone valve which in turn fires the boiler. The other BDR91 is bound as a System Device in Boiler Demand Relay. This is triggered whenever any radiator needs heat. The BDR91 triggers the CH zone valve which in turn fires the boiler.
So far so good?
Now when I add OpenTherm to this. How do things change?
I didn't think I could use both an Opentherm bridge as well as a Boiler Relay for Boiler Demand?
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