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- 27 Jan 2008
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At the moment the wall thermostat is in the hall, I however have a problem, the hall has no TRV and has to be crossed to enter the wet room, if set to 20°C hall is great, but rest of house too hot, open the lock shield valve and hall hot and rest of house cold, no amount of fiddling seems to get a balance. Not surprising as needs to have a threshold free front door so there is a cold draft with wind coming from front of house, no real cure due to wheel chair access. So best option would seem to be fit a TRV to the hall radiator. That is all well and good, but then where can I put the wall thermostat?
As far as I can work out the wall thermostat is to stop the central heating boiler running in the summer, it should not do a thing in the winter, in the winter the TRV controls the room temperatures by adjusting the flow, this in turn controls the return water temperature as the bi-pass valve starts to open and the return water temperature controls the boiler flame height, so we have analogue control with low hysteresis, if the wall mounted thermostat controls the boiler then we get a high hysteresis so only when we reach the point where the boiler can't turn down low enough so has to switch on and off should we be looking at the wall thermostat taking over control.
The anti-cycle software in the boiler can't cope in heart of summer, so then we want the wall thermostat to take over, with standard TRV's it should be just a case of setting the wall thermostat slightly higher than the TRV, however this does not work, as set to 21°C the central heating would turn off too late in the summer and house would end up far too hot.
However heat raises and in the landing and bedrooms the temperature reaches 21°C far earlier, it would seem having the thermostat upstairs on the landing would remove the problems of cold drafts from front door, and it could be set to 20°C with TRV set to 18°C and in theory it should work?
So why is not every house set up that way? What have I missed? I can't believe I am the only one to consider the wall thermostat should be placed upstairs away from drafts. I look at the places it can be placed, or more to point where it can't be placed, no good in living room as eTRV fitted. Same will apply for downstairs bedroom and hall, kitchen heat from cooking will upset it, wet room underfloor heating will upset it, this only leaves upstairs, bedrooms will be set too warm, loo has no radiator, bathroom again set on hot side, so it would seem only place is the landing. So what if anything have I overlooked?
As far as I can work out the wall thermostat is to stop the central heating boiler running in the summer, it should not do a thing in the winter, in the winter the TRV controls the room temperatures by adjusting the flow, this in turn controls the return water temperature as the bi-pass valve starts to open and the return water temperature controls the boiler flame height, so we have analogue control with low hysteresis, if the wall mounted thermostat controls the boiler then we get a high hysteresis so only when we reach the point where the boiler can't turn down low enough so has to switch on and off should we be looking at the wall thermostat taking over control.
The anti-cycle software in the boiler can't cope in heart of summer, so then we want the wall thermostat to take over, with standard TRV's it should be just a case of setting the wall thermostat slightly higher than the TRV, however this does not work, as set to 21°C the central heating would turn off too late in the summer and house would end up far too hot.
However heat raises and in the landing and bedrooms the temperature reaches 21°C far earlier, it would seem having the thermostat upstairs on the landing would remove the problems of cold drafts from front door, and it could be set to 20°C with TRV set to 18°C and in theory it should work?
So why is not every house set up that way? What have I missed? I can't believe I am the only one to consider the wall thermostat should be placed upstairs away from drafts. I look at the places it can be placed, or more to point where it can't be placed, no good in living room as eTRV fitted. Same will apply for downstairs bedroom and hall, kitchen heat from cooking will upset it, wet room underfloor heating will upset it, this only leaves upstairs, bedrooms will be set too warm, loo has no radiator, bathroom again set on hot side, so it would seem only place is the landing. So what if anything have I overlooked?