Think I’ve answered my own question but thoughts welcome.
I just noticed one of two radiators in a room was receiving hot water and not the other, or at least one of them was receiving significantly more hot water.
There was no heat demand on the controller for this zone but there was elsewhere.
Eventually there was a heat demand in this zone and both radiators started getting warm. I checked the valve position on both radiators and it was the same on each.
I set the zone to a very low temperature and both HR92’s shut down to 0. Both radiators then received no hot water so there was no problem with the valves or seating of the HR92.
So my conclusion is that the master HR92 has a very different valve throw than the other slave. I’m certain this is likely true as I recently replaced the master radiator and valve so it’s no longer the same as the slave one.
To overcome the difference in valve throws and radiator output I’ll change this room to a multi zone.
I just noticed one of two radiators in a room was receiving hot water and not the other, or at least one of them was receiving significantly more hot water.
There was no heat demand on the controller for this zone but there was elsewhere.
Eventually there was a heat demand in this zone and both radiators started getting warm. I checked the valve position on both radiators and it was the same on each.
I set the zone to a very low temperature and both HR92’s shut down to 0. Both radiators then received no hot water so there was no problem with the valves or seating of the HR92.
So my conclusion is that the master HR92 has a very different valve throw than the other slave. I’m certain this is likely true as I recently replaced the master radiator and valve so it’s no longer the same as the slave one.
To overcome the difference in valve throws and radiator output I’ll change this room to a multi zone.
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