Electronic smart TRVs and our ASHP

RE: Electronic smart TRVs and our ASHP

gfkw1947 · 2022-02-13T15:18:44Z

Hi, We live in a very old cottage in Norfolk which has been extended and updated. We have been here for 32 years. Last year we decided to replace our old oil-fired boiler with an ASHP. We received a lot of conflicting and clearly wrong information from installers and eventually found a consultant who for a small fee assesses your needs (using info about your house provided by you), and then recommends a manufacturer and installer. This all worked well and we are delighted with the result - up to the point where we struggled and still do, with the operation of the electronic smart TRVs. The installer positioned them where the original TRVs had been on the rads. But they do not work properly. It seems that long before the room warms up the valves close down because they are reacting to the temperature of the hot water constantly circulating in the pipes feeding through the valves and into the radiators. I do wonder if the problem is the position of the TRVs which are all at the bottom feed. We were using Tado valves before but did not have the same problem because we also had room thermostats. The room thermostats would override the TRVs to open or close them and also turn the boiler off and on. Has anyone experienced this problem or have suggestions, please?

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gfkw1947

(@gfkw1947)

Active Member Member

Joined: 4 years ago

Posts: 11

Topic starter 16/02/2022 9:54 am

@editor Thanks MARS - I will certainly take a look. I'm all for making life as simple as possible - and I found the Tado worked very well when I had the Oil boiler - partly because I combined the TRVs with room thermostats. This gave a much more accurate reading of the room temp. and these could be set to override the sensors in the TRV. But the TRVs were opened and shut and controlled by the room thermostat. Thanks for your help

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Graham Hendra

(@grahamh)

Reputable Member Member Professional Installer

Joined: 5 years ago

Posts: 110

18/02/2022 9:11 am

I'm a bit old fashioned when it comes to trvs, electronic or not. On my system I chucked the trvs away and balanced the system with the lockshield rad valves. If you heat pump is weather compensating the trvs will hardly move and are pretty much redundant. The heat pump will alter the radiator temperature so you won't want to alter the amount if water entering the rads with a trv. If you are not weather compensating and the plumber didn't balance your system your trvs will be working overtime.

Trvs are used to balance your system automatically. That's all they do.

Heat pump builder

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gfkw1947

(@gfkw1947)

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Joined: 4 years ago

Posts: 11

Topic starter 18/02/2022 12:39 pm

@grahamh Thanks, Graham. I have been playing around and changing various settings on the ashp and the Easytron trvs and have got a reasonable operating system now. But as you say - what it is really is a sophisticated way of balancing the system, and in fact, that is really how I am using them now. The only advantage as far as I can tell is that I have three rooms that are only used every few weeks or so, two others that are only used for a short time each day and I can have the flow through these rads set up to change automatically as and when. Also means that bedrooms can be warmed up before going to bed and getting up and living rooms the other way round.

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