RF Mains link kit on a heating system.

[Soulsurfer]

Hey all,
I have a heating system to play around with as it's been not working very well, heating non stop until house was like a sauna etc.. and guy wants to fit a nest that he bought. He's a bit keen on going all smart home so I'm thinking of going to do a Loxone course.

Problem so far is that the nest is 12V so I'm thinking of re-using the existing 3 core to the room stat and connecting to the nest heat link hub to make 12V instead of 240V, but as cylinder stat is out the way upstairs with a route full of asbestos I need to get a link between garage (hub) and the airing cupboard in the house without running a 3 core as existing is just 1 x twin supplying the cylinder stat and hot water valve next to it.

A mate has suggested the mains link over RF to basically give a remote command for the heat link / hub. Anyone used them ? rate them ?

Thanks in advance..

 

[Leesparkykent]

I've used them and think they're a good bit of kit. If you grab a copy of the latest professional electrician magazine they have a voucher towards the back pages for buy one get one free.

 

[Soulsurfer]

I've used them and think they're a good bit of kit. If you grab a copy of the latest professional electrician magazine they have a voucher towards the back pages for buy one get one free.

Never heard of that mag is it a newsagent job ?

 

[Soulsurfer]

Found site online but just looks like an online only, can't see how to buy etc..

 

[Ian1981]

Never heard of that mag is it a newsagent job ?

It’s in all the Electrical wholesalers on the counter, free to the trade.

 

[Soulsurfer]

Ah cheers mate, we don't get them here ! Jersey issues !

 

[Leesparkykent]

Ah cheers mate, we don't get them here ! Jersey issues !

here you are mate

 

[Soulsurfer]

here you are mate

View attachment 39200

View attachment 39201

Lee Sir you are a legend mate, I ordered one, well 2 sets and got the offer code one discounted and VAT off too and both sent today to Channel Islands for £104 ! A beer is owed buddy Thanks, Matt.

 

[Leesparkykent]

Lee Sir you are a legend mate, I ordered one, well 2 sets and got the offer code one discounted and VAT off too and both sent today to Channel Islands for £104 ! A beer is owed buddy Thanks, Matt.

Happy days mate, glad to help.

 

[Soulsurfer]

Happy days mate, glad to help.

While you're on a roll mate ! Can you have a little check over a change I'm trying to achieve with an old boiler to a nest stat and it's the job where I may or may not need to use a set of RF Mainslink.

I went today and because it was a horrible mess all jumbled into a single old pattress box I took apart and started again with the nest and heatlink plus a danfoss wiring centre.

The wiring I've done so far is as follows:
All usual cabling to the heat link and then I have 6 on heat link calls for hot water into a terminal on wiring centre and connects to one core of a twin I have (that originally took a L + N to cylinder cupboard to feed Com on cyl stat) then from cyl stat was straight onto valve actuator up in cupboard and picked up the neutral for the valve.
Now I have used the twin going to cylinder to feed the cyl stat com from the heat link call then back down to wiring ctr on the blue core when the cyl stat closes. I was then thinking I need to use rf switch to send a s/l and n to the valve upstairs, but thinking about it, could I not just come straight from the nest call for hw to the cyl stat com on the existing twin and then when stat closes feeding the brown of valve motor and use the N on that twin for the valve to open ?
But do I need another cable to call boiler in for hot water ?

Other issue is heating valve is an old one and I don't think working correctly or if it will work with the nest.
Thought about changing for a Danfoss HPA2 spring return or similar as this old Sunvic has a yellow to open, white to close and an orange (not in use) but when nest calls for heating onto the yellow to valve the valve opens and the white ( apparently to close the valve via 240V too) stays at 240V also. Tried feeding the white from satisfied on heat link to shut valve when not calling but it doesn't seem to work.

My head hurts now... First boiler on my own to sort / modify.