Having finally given up on Evohome due to constant overshoot with no apparent solution I thought I would try using a Y87RF bound directly to the BDR91 connected to my combi boiler.
I was amazed to see no overshoot and pretty much perfect temperature control in the room where the Y87RF was placed so with no Evohome controller between these 2 components all appears fine.
I assume that when I set a target temperature on he Y87RF it transmits both the current room temperature & user set point to the BDR91 which then computes the estimated TPI cycle (I may be wrong here so please educate me if that is the case)
So for me it looks like the 'smart' bit was not so smart but the BDR91 can control the room temperature very well if given suitable demand.
An interesting experiment for me and a useful fallback if whatever system I try next fails.
I was amazed to see no overshoot and pretty much perfect temperature control in the room where the Y87RF was placed so with no Evohome controller between these 2 components all appears fine.
I assume that when I set a target temperature on he Y87RF it transmits both the current room temperature & user set point to the BDR91 which then computes the estimated TPI cycle (I may be wrong here so please educate me if that is the case)
So for me it looks like the 'smart' bit was not so smart but the BDR91 can control the room temperature very well if given suitable demand.
An interesting experiment for me and a useful fallback if whatever system I try next fails.
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