woodman Posted November 20, 2022 Share Posted November 20, 2022 My heating system is oil fired y plan, with all rads controlled by Drayton Wiser smart TRVs. The system works well, but I have concerns that the 3 port valve may be starting to intermittently stick. I know how to fix this, however it's really hard to access, and as 3 port valves are a known weak point, I'd like to eliminate it... As each rad is controlled by a smart TRV, theoretically I don't think I need any additional valve (ie the 3 way valve) to control the overall flow to the heating system. So far, so good That leaves the hot water. That leaves the hot water. I'm thinking that a 2 port valve located in the dhw tank heating coil circuit, adjacent to the dhw tank, powered by the dhw demand thermostat circuit from the wiser programmer would do it. This in itself would not give dhw priority, however this can be achieved by programming the dhw heating to be on at times when the heating is off. (I may have add a bypass or modulating pump to accommodate situations where only 1 radiator is demanding heat) This seems like a logical forward step, does anybody have any experience in doing anything similar, or any suggestions/improvements to this idea? Link to comment Share on other sites More sharing options...
ProDave Posted November 20, 2022 Share Posted November 20, 2022 Do the job properly, convert to two 2 port valves, convert the wiring to S plan. If they are awkward to get to and you are concerned about maintenance, use Honeywell valves. Link to comment Share on other sites More sharing options...
woodman Posted December 4, 2022 Author Share Posted December 4, 2022 Thanks for your advice. However my thoughts are this: S-plan and Y-plan were implemented long before smart systems were even thought of, and it could be said that they are at best a compromise considering what was available at the time. I'm trying to move the system design forward from the 80's technology, however add on systems such as Wiser are aimed at retro fit, thus the installations are tailored towards minimal work to install. If Wiser (or similar) were to make a single valve which would wirelessly control a 22mm valve, this would be ideal, allowing direct wireless control of heating of DHW in addition to individual control of each rad. In the meantime, I'm looking to eliminate what is unnecessary complexity when a smart control system is implemented onto a traditional Y system Incidentally, does anybody know of a wireless valve which may do this? Link to comment Share on other sites More sharing options...
JohnMo Posted December 4, 2022 Share Posted December 4, 2022 People love reinventing the wheel and spending loads to replace something tried tested and works. Smart thermostats and Trvs everywhere is great in theory, but be careful they don't increase oil consumption when the boiler starts short cycling, when it's only got one circuit to manage and has little or modulation. 1 Link to comment Share on other sites More sharing options...
Temp Posted December 4, 2022 Share Posted December 4, 2022 +1 As far as I know oil boilers don't modulate at all. The burner is either full on or off. Link to comment Share on other sites More sharing options...
Radian Posted December 4, 2022 Share Posted December 4, 2022 8 hours ago, JohnMo said: People love reinventing the wheel and spending loads to replace something tried tested and works. Sounds like me - except for the spending loads bit 😄 On 20/11/2022 at 09:58, woodman said: As each rad is controlled by a smart TRV, theoretically I don't think I need any additional valve (ie the 3 way valve) to control the overall flow to the heating system. So far, so good That leaves the hot water. Do your smart TRV's totally shut off the flow into the radiators? I've had mixed results with zigbee TRV's and wouldn't trust them to stay completely closed outside the heating season. Link to comment Share on other sites More sharing options...
JohnMo Posted December 5, 2022 Share Posted December 5, 2022 8 hours ago, Radian said: Do your smart TRV's totally shut off the flow into the radiators I think it depends on make and model, some are just on or off others will modulate, but suspect most on the market are on or off. The only thing being smart is the internet connection. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now