Hi
I've been battling with my Evohome install for a while where I've two rooms both with two radiators in each, where in both cases the second radiators radiators appeared to be the only ones getting hot (unless there was a high increase in heat demand say first thing in the morning). This isn't a balancing issue as the radiators all come up to heat quickly without the HR91's attached. I also noticed in both rooms, that the 1st radiators appeared to only be opening a small amount under low heat demands (proven by removing the HR91s), whereas the 2nd radiators are both opening more, thus allowing hot water to flow. Tried changing the zone to single/multiple rooms and this had no effect. Re-created zones, reset bindings loads of times, no effect. Checked and both zones had two actuators listed, and both tested perfectly with the RF zone check.
So in an attempt to try and workout what was going on I added each radiator to its own zone, essentially creating 4 zones (Kitchen 1, Kitchen 2, Living Room 1 and Living Room 2) with 4 radiators, initially under low load, each radiator started warming.
So the question is.... When you add multiple radiators to a zone, does Evohome try and be clever by only using 1 radiator when the heat demand is low, say < 40%? What's odd is in both cases the 1st radiators were in cooler parts of the room (proven by them reporting a lower temp where split into 4 zones), yet it was favouring heating only the second radiators to bring the room up to temp.
Thoughts, in both cases the rooms are quite big, so only having 1 radiator in each room heating on low load means the rooms take longer to heat, so for the moment I'm sticking with 4 separate zones.
I've recently changed our radiator valves to Valencia, could it be that the HR91s need to re-learn opening positions, heat up speeds etc...? Or could it be that I should just leave things to settle down for a few days, maybe all my fiddling is causing the HR91 learning to be reset and not adjust?
Dan
I've been battling with my Evohome install for a while where I've two rooms both with two radiators in each, where in both cases the second radiators radiators appeared to be the only ones getting hot (unless there was a high increase in heat demand say first thing in the morning). This isn't a balancing issue as the radiators all come up to heat quickly without the HR91's attached. I also noticed in both rooms, that the 1st radiators appeared to only be opening a small amount under low heat demands (proven by removing the HR91s), whereas the 2nd radiators are both opening more, thus allowing hot water to flow. Tried changing the zone to single/multiple rooms and this had no effect. Re-created zones, reset bindings loads of times, no effect. Checked and both zones had two actuators listed, and both tested perfectly with the RF zone check.
So in an attempt to try and workout what was going on I added each radiator to its own zone, essentially creating 4 zones (Kitchen 1, Kitchen 2, Living Room 1 and Living Room 2) with 4 radiators, initially under low load, each radiator started warming.
So the question is.... When you add multiple radiators to a zone, does Evohome try and be clever by only using 1 radiator when the heat demand is low, say < 40%? What's odd is in both cases the 1st radiators were in cooler parts of the room (proven by them reporting a lower temp where split into 4 zones), yet it was favouring heating only the second radiators to bring the room up to temp.
Thoughts, in both cases the rooms are quite big, so only having 1 radiator in each room heating on low load means the rooms take longer to heat, so for the moment I'm sticking with 4 separate zones.
I've recently changed our radiator valves to Valencia, could it be that the HR91s need to re-learn opening positions, heat up speeds etc...? Or could it be that I should just leave things to settle down for a few days, maybe all my fiddling is causing the HR91 learning to be reset and not adjust?
Dan
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