Hi All
Hoping to give some clarity on a few things.
Windows sensors
You do not need to buy the window sensors with the HR92. We get this question a lot. The older TRV's (especially in Europe, where there are compliance rules) had the option of a wired sensor which would detect if the window was open. The HR92 does not need this as it has a fuzzy logic computer which after learning the signature of the room can detect the same 'effect' an open window or abnormial ventilation is occuring. This setting can be tweaked in the deep settings of the HR92.
Outside Temp
Due to the optimisation routines, learning and rooom by room sensing & control - any outdoor weather sensing is redundent, other than to provide insight. There is a legacy optional add on sensor - but this has no impact on how evohome operates. This is because you have to understand that in the 'old' days the learning capabilities, room by room sensing and the clever boiler throttling that can be achieved, were not available. A sudden cold weather front coming in, is irrelevant. What is relevant is the room temperature and how evohome achieves the target temperature. It could be -5 dropping to -10 but your house could be insulated well, so at what point does evohome decide to act? On neither actually - its what happens inside the home is what it cares about. There is a direct correlation to the outside temp and the inside of your home. But the inside of your home has a different heatup/cool down signature to any outside measurement. If your rooms inside the home drop below X then it will act. Or a new schedule is due to kick in and it knows that it needs to achieve Y, then the optimisation will kick in. Based on the signature of the room, even if a cold snap comes in, the evohome will act based on what it knows it should do to recover. IT is constantly monitoring. It could be suddenly -5 and snowing outside, but due to insulation your room could be comfortable for many hours. There are settings for the optimisation - ie have mine limited to 2 hours pre start for instance, which is more than enough ( a highly insulated room might be 1hr) .
It is interesting to note in Germany, most of their houses operate with outside weather control on their heating. The market is starting to adopt evohome with no boiler control (becuase it would be too intrusive to remove the weather control and set evohome up to control the boilder), and evohome controls the system in exactly the same way, but without the boiler 'firing'. Their systems can detect valves opening remotely on the heating system, so this generates the 'demand' for heat. So they get the SmartZoning and let the boilders operate as normal. (They especially like becuase of the balancing nature - ie a cold day but sunny on one side of the house) In the UK (and other countries) we dont have this system, which doesnt matter as evohome is capable of controlling the heat source, via a BDR.
I hope this helps - In summary It would be impossible for a fully embedded evohome system that had learned the home and was SmartZoned to be 'caught by surprise' by any weather temperature shift. The weather (and forecast) appears on the app to provide additional information to the user.
(PS Humidity is a big factor on how people 'feel' - Whilst I see my system tells me on days like today its 21 degrees, it feels colders due to the 93% humidty, so yes of course treat yourself to a 'burst' of comfort if needed, but usually the temp is correct. )
Hoping to give some clarity on a few things.
Windows sensors
You do not need to buy the window sensors with the HR92. We get this question a lot. The older TRV's (especially in Europe, where there are compliance rules) had the option of a wired sensor which would detect if the window was open. The HR92 does not need this as it has a fuzzy logic computer which after learning the signature of the room can detect the same 'effect' an open window or abnormial ventilation is occuring. This setting can be tweaked in the deep settings of the HR92.
Outside Temp
Due to the optimisation routines, learning and rooom by room sensing & control - any outdoor weather sensing is redundent, other than to provide insight. There is a legacy optional add on sensor - but this has no impact on how evohome operates. This is because you have to understand that in the 'old' days the learning capabilities, room by room sensing and the clever boiler throttling that can be achieved, were not available. A sudden cold weather front coming in, is irrelevant. What is relevant is the room temperature and how evohome achieves the target temperature. It could be -5 dropping to -10 but your house could be insulated well, so at what point does evohome decide to act? On neither actually - its what happens inside the home is what it cares about. There is a direct correlation to the outside temp and the inside of your home. But the inside of your home has a different heatup/cool down signature to any outside measurement. If your rooms inside the home drop below X then it will act. Or a new schedule is due to kick in and it knows that it needs to achieve Y, then the optimisation will kick in. Based on the signature of the room, even if a cold snap comes in, the evohome will act based on what it knows it should do to recover. IT is constantly monitoring. It could be suddenly -5 and snowing outside, but due to insulation your room could be comfortable for many hours. There are settings for the optimisation - ie have mine limited to 2 hours pre start for instance, which is more than enough ( a highly insulated room might be 1hr) .
It is interesting to note in Germany, most of their houses operate with outside weather control on their heating. The market is starting to adopt evohome with no boiler control (becuase it would be too intrusive to remove the weather control and set evohome up to control the boilder), and evohome controls the system in exactly the same way, but without the boiler 'firing'. Their systems can detect valves opening remotely on the heating system, so this generates the 'demand' for heat. So they get the SmartZoning and let the boilders operate as normal. (They especially like becuase of the balancing nature - ie a cold day but sunny on one side of the house) In the UK (and other countries) we dont have this system, which doesnt matter as evohome is capable of controlling the heat source, via a BDR.
I hope this helps - In summary It would be impossible for a fully embedded evohome system that had learned the home and was SmartZoned to be 'caught by surprise' by any weather temperature shift. The weather (and forecast) appears on the app to provide additional information to the user.
(PS Humidity is a big factor on how people 'feel' - Whilst I see my system tells me on days like today its 21 degrees, it feels colders due to the 93% humidty, so yes of course treat yourself to a 'burst' of comfort if needed, but usually the temp is correct. )
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