Tado extension installation on baxi-duo-tec 28HEA Combi - wiring question!

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Tado have sent me some personalised instructions to install the extension kit into my baxi-duo-tec 28HEA Combi. Having looked at the terminal block Tado are asking me to to connect the blue to N, Brown to 1 and grey to 2 in the terminal box. All good so far as for Brown to 1 and grey to 2 this is not a problem (see attached) pic. However, I've attached the pics of the page of my baxi manual which deals with connecting external controls and a room stat. In there it says clearly the live, neutral and earth must be taken from the fused spur (see pic of the fused spur). The neutral in the terminal box is already occupied and runs to the fused spur box.

When I questioned this Tado responded with:

I can assure you that the installation instructions you have received are correct and the Extension Kit is powered by the 230V switched signal. Therefore there is no need to power it externally.

Yes, you can attach two wires to the same terminal.

Any advice on their advice especially two neutral wires running off the same terminal! Not touching anything until I'm sure!
 
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Any advice on their advice especially two neutral wires running off the same terminal!
That's fine and exactly how it is done. If you were to take the wire back to the N at the fused spur instead, you would then have two wires in the same terminal in there instead.

TI can assure you that the installation instructions you have received are correct and the Extension Kit is powered by the 230V switched signal. Therefore there is no need to power it externally.

Your boiler does indeed provide a 230V 'Live' which is supplied from the fused spur via internal boiler wiring.

Capture.PNG


I can't comment on anything else as you only give part of the wiring information.
 
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Hi Stem, thanks so much for answering my questions you've cleared that up. Just double checked again with Tado as well. Thought I'd post as could help someone in the future as well. Cheers
 
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Can anyone tell is it correct for baxi boiler for tado extension
 

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Don't you have an existing programmer? The Tado extension fits right onto the standard programmer backplate. Just remember to set the jumper for potential free/240v switching.
 
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Don't you have an existing programmer? The Tado extension fits right onto the standard programmer backplate. Just remember to set the jumper for potential free/240v switching.
I don’t have thermostat in my home so bought extension kit for control the hot water
 
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The wiring diagram below is correct, as you can see, it matches what you have. Remove the yellow link and then wire the terminals to the Tado terminals 1 and 4, it doesn't matter which way around they go.



As drawn, it's wired up as the potential free version. Make sure the jumper is in the correct position as shown, and the boilers integral clock is set to be permanently 'on', otherwise it can interfere with the operation of the Tado.


bought extension kit for control the hot water
The Hot water control facility is provided for systems that have a hot water cylinder that is heated up according to a timed schedule. If you don't have one, you don't need it. Combi's provide instantaneous hot water when a tap is turned on, there is nothing that needs any time control, and if you don't have a hot water cylinder with motorised valve, there is nothing you can wire it up to.
 
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All done working good thanks for the help
 

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