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Timed TRVs

Discussion in 'Plumbing and Central Heating' started by wig, 26 Oct 2020.

  1. wig

    wig

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    Last edited: 26 Oct 2020
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  3. ericmark

    ericmark

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    Yes I have 9, that is 5 of these [​IMG] but bluetooth version, and 4 of these [​IMG] and although the former only cost me £15 each and the latter £36.50 each I find the former in general better, I believe the best is this [​IMG] the Drayton as it have algorithms to work out when to switch off, but as to if worth £44 each not so sure. So I will start with the Energenie which was the first ones I bought.

    It took some setting up, as the TRV was fitted on the return, and as a result radiator got hot, then the valve closed causing it to over shoot, so the lock shield valve needed careful setting, but the display TRV_report.jpg makes it easy, if current over target close the lock shield a little, and if current under target open it a little, and once set they were spot on. However the anti hysteresis software was a little OTT so set to 20°C form 16°C it reaches 18°C fast but last 2°C could take 2 hours, so I would cheat and set to 22°C for 1 hour then back to 20°C and then spot on. But there was very little manual control, you had to use phone, tablet, or PC and you needed the hub, another £48.

    The eQ-3 much cheaper the bluetooth Screenshot_20190726-164748_calor BT.jpg does make setting easier, but unless two TRV's in the same room not really required, as everything can be manually set, I have seen manual version down to £10 each, it has window open detect which is not on the more expensive energenie model and I find I don't use the phone once set, the right button swaps from eco to comfort and back so I just press the button if I use room early.

    The bluetooth version will only link to one phone, so wife controls 2 and I control 3.

    However I find the house does not cool that fast, so although set to 16°C it never cools that much, and of course the boiler must be running for room to heat up, although the energenie using IFTTT will geofence, I use the Nest Gen 3 wall thermostat to do that, in theory I should be able to control with my Nest Mini, but the Nest Mini is like a mischievous little boy, and does its own think, so will not trust with heating.
     
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  4. ericmark

    ericmark

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    There is a huge difference in what I can do with each TRV head this Screenshot_20190725-112626_calor BT.jpg is the schedule for the eQ-3, but the energenie has many more options the base screen Over_all_report.jpg even more now this is an old screen shot, in theory using IFTTT I should be able to link the TRV current temperature to the plug in switch/monitor which in summer controls my portable AC so should be able to auto start/stop the AC unit depending on room temperature, however the AC in the two years we have lived here has only ran for around 5 weeks, so hardly worth automating, I just look at room temperature before returning home and it temperature high I manually turn it on.

    And this is the thing about central heating as well, how much automation is really required, cooling or heating it takes time, and Nest Gen 3 seems to work out when to turn on the heating before my return, but the energenie mihome did not have such complex algorithms, and as said I cheated to get rooms to temperature, the same now with simple eQ-3 by setting times with just 10 minuets delay between the TRV's switching on I can ensure first kitchen, then dinning room and then living room are heated, in the order they will be used.
     

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