Tado wiring on S-Plan with Unvented

[mutley racers]

Hi all.

Anyone install tado some tado kit before? I am wiring up an S plan with an unvented cylinder and the cylinder stat common is wired to the brown on the hw 2 port and NO is wired to DHW on.

Tado needs to be wired up the standard way. Hope that makes sense.

Thanks

 

[Brambles]

The wiring you have described for Tado on a switched live connection is correct.

Are you looking for confirmation, or do you have a specific issue?

 

[mutley racers]

Hi Mate. Thanks for the reply. It's the Unvented stat that is confusing me as it is not wired up as this. So do I just change the stat to suit Tado?

Cheers

 

[Brambles]

The two existing DHW thermostats on the unvented cylinder remain wired in series. That is very important. Tado provides the live feed to the DHW control valve through the existing stats. So you replace the existing live feed to the stats with the DHW live feed from Tado. Tado is purely a timer for DHW it does not control hot water temperature, the existing stats do that.

 

[mutley racers]

Thanks brambles for the quick reply and advice. This is a new set up so no existing controls. But I basically wire it up as the unvented cylinder MI's say in the photo so DHW on goes NO on cylinder stat and Common goes to Brown on 2 port.

Cheers

 

[Brambles]

Correct, but there should be two stats wired in series on the unvented cylinder. A working stat and a safety stat set at a slightly higher temperature ( normally the immersion heater stat).

 

[mutley racers]

Yes the stat is a dual stat. You can see it at the top of the wiring diagram in the image