It seems logical to me to have valve bodies that have hard rubber washers that give low hysteresis to the TRV (HR92 in this case) to work with. It's counter productive to have a large, undetermined % of the movement wasted in decompressing a soft washer.
The other point is that a small radiator will need a tiny adjustment of the pin to maintain a steady room temperature, in comparision to a large radiator. I think it would help if Evohome asked for radiator size information at installation time, so a suitable scaling value could be applied to valve movement. Though maybe this is taken care of during the learning period.
I believe the purpose of the lockshield is to allow just enough hot water to flow through the radiator that lets it heat the room under the most severe weather conditions. Flow needs to be restricted within individual radiators to ensure hot water is directed to all other radiators that may be calling for heat, without leaving any starved for water.
Martin.
The other point is that a small radiator will need a tiny adjustment of the pin to maintain a steady room temperature, in comparision to a large radiator. I think it would help if Evohome asked for radiator size information at installation time, so a suitable scaling value could be applied to valve movement. Though maybe this is taken care of during the learning period.
I believe the purpose of the lockshield is to allow just enough hot water to flow through the radiator that lets it heat the room under the most severe weather conditions. Flow needs to be restricted within individual radiators to ensure hot water is directed to all other radiators that may be calling for heat, without leaving any starved for water.
Martin.
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