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We have a wet UFH system in our kitchen that was installed with an Optimum thermostat. All working fine but I’ve bought a Nest to replace it, as this is what we’re using for the central heating in the rest of the house, and is much easier to use.
(After this replacement we’ll have two nest thermostats and two nest heatlinks).
I was hoping that replacing the optimum duostat receiver with the Nest heat link would be quite straightforward, as it would just be a case of switching some wires over. But having opened the current box, it all looks a bit chaotic to me. I’m wondering if anyone can give me a bit of a steer as to what might be involved.
You can see here our UFH pump and the cable going to the Optimum duostat receiver (top left). There’s another cable coming from a 230V Honeywell junction box. So I assumed cable from pump is the call to heat and the other is the power.
For reference, this diagram from the manufacturers website shows what should go where…
And here’s my installation. It’s difficult to get the full setup of the wiring in a photo, this is the best I could do…
From what I can see. There’s two wires coming from my pump, a blue one that’s been put into slot 3, and a brown into slot 1.
Then from my power cable, there’s a black wire going into 1, a grey wire going into 3, and a brown wire going into 4.
Then it also looks like there’s a wire going from 4 directly to 2.
And also a earth wire from both pump and power cable going nowhere (taped up in the photo).
Is this some kind of crazy mess that will take a proper electrician to sort out? Or is there a straightforward way to rewire this all into the Nest heat link?
Many thanks
(After this replacement we’ll have two nest thermostats and two nest heatlinks).
I was hoping that replacing the optimum duostat receiver with the Nest heat link would be quite straightforward, as it would just be a case of switching some wires over. But having opened the current box, it all looks a bit chaotic to me. I’m wondering if anyone can give me a bit of a steer as to what might be involved.
You can see here our UFH pump and the cable going to the Optimum duostat receiver (top left). There’s another cable coming from a 230V Honeywell junction box. So I assumed cable from pump is the call to heat and the other is the power.
For reference, this diagram from the manufacturers website shows what should go where…
And here’s my installation. It’s difficult to get the full setup of the wiring in a photo, this is the best I could do…
From what I can see. There’s two wires coming from my pump, a blue one that’s been put into slot 3, and a brown into slot 1.
Then from my power cable, there’s a black wire going into 1, a grey wire going into 3, and a brown wire going into 4.
Then it also looks like there’s a wire going from 4 directly to 2.
And also a earth wire from both pump and power cable going nowhere (taped up in the photo).
Is this some kind of crazy mess that will take a proper electrician to sort out? Or is there a straightforward way to rewire this all into the Nest heat link?
Many thanks
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