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PostPosted: Sat Sep 16, 2017 8:04 am 
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The house is built around a hall which is the hub connecting kitchen, front and back rooms, wet room to stairs and front door. In the hall is a large radiator with a lock shield and standard low quality TRV and other side of door way a wireless wall thermostat which is the master control for wet central heating. The wall thermostat and radiator TRV are set so if the front door is opened then the TRV will also open and allow the radiator to reheat the hall quickly, but as it approaches around 19°C it closes again so slowing down the hall reheat so rest of the house can get warm before the wall thermostat turns off the boiler.

Not ideal, EvoHome would be better, but in general it works. However there is a problem if doors are left open, heat then enters the hall from other rooms, not too much of a problem with most of the rooms as although ideally want living room warmer than hall, it will only make around 1°C difference in the temperature of living room, however the wet room is causing a problem as it has under floor heating independent to central heating, on the night before mother is due for morning shower as we go to bed we turn on the under floor heating, it only just takes the chill off the room and with door closed not a problem. However if mother visits room in the night and leaves the door open then heat from wet room is just enough to tip the balance and the hall becomes just that little bit warmer so central heating does not run in the morning.

Once up to temperature for the day there is no problem, we close door as we pass, and have a second thermostat in kitchen wired in parallel to hall thermostat which we can use to give a boost, but over night central heating is switched off, but at 6 am it auto turns on and the eTRV's are set to 22°C and 23°C until 8 am when they go to 19°C and 20°C without that morning boost the anti hysteresis software in the eTRV means the rooms will not hit the 19°C and 20°C until mid day, the morning boost gets the rooms warm ready for mother getting up. However of course the boiler must be running. If underfloor heating in wet room is on and door left open then boiler simply does not run for long enough to heat the other two rooms.

I had noted every so often the two rooms were cool, but until today had not realised why, I corrected the fault at 7 am switching off under floor heating and closing wet room door, however by 8 am when valves auto change to lower temperature rooms still under temperature at 18°C and 19°C not too much but with a 92 year old mother temperature is important.

Ideas please, under floor thermostat similar to this one but no logo and there is a FCU supplying the thermostat. Already have Mi|Home energenie eTRV's and lights and sockets but can't see a remote control FCU which I could use to control supply to under floor heating. So trying to think of a way to stop heating being too low when wet room door left open?


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PostPosted: Sat Sep 16, 2017 9:21 am 
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Door closer?

Colin


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