Boss TRV replace to Smart TRV zigbee generic brand

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Hi Everyone,

I wondered if anyone might be able to help or throw some light on this.
I thought this was going to be a really simple project, replace my existing TRV heads for a smart home TRV one - looks simple enough, unscrew and then screw on the new, they even supply mutlple adaptors to match various TRVs.

The radiators predate me - So not sure how old these TRVs are.

My first mistake (thinking it was simple)!

I removed the head of the TRV (which is a boss TRV) see pic - which after looking at the thread, seems to be a 26mm ?? Again, after looking seems non standard from the 30mm that seems typical (of course, when has a fitting ever been standard!) :)
IMG_4694.JPEG Screenshot 2021-11-12 154647.jpg

None of the adaptor work or fit (see pics of box) included with the Smart TRV
IMG_4684.JPG IMG_4695.JPG

Anyone have any ideas (short of replacing the whole valves with new).
I've seen things like this on Amazon see pic - not sure if it works
adaptor.jpg

Which seems like they would work... they just fit over the existing thread??

Thanks for helping.

Russ
 
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I'd give the Amazon converter a try- the heads you've gone for look limited to 30mm thread- you can always send it back if it doesn't work! Or have a look at other heads- not certain but I think the Wiser ones have different diameter thread adaptors... just checked, they have a Danfoss RA adaptor but think yours do as well so maybe not.
 
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Found a solution - Just in case anyone ever searches this link for a fix ... This works fine, not the cheapest option but saves having to change the valves yourself
71X6JY53p-L._AC_SL1100_.jpg

Got this from Amazon, just screws over the top

  • Allows the installation of electronic Ventilantrieben with M30 x 1.5 mm Thread to Heizungsventilen with M28 x 1.5 mm Thread
  • Assemble simply twist-no special tools required
 
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