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Help replacing Honeywell T3 with wiring Tado thermostats on Baxi Assure 36 combi boiler

aleoo
aleoo
edited November 2023 in General Questions & Topics

hi there, I have a Baxi Assure 36 combi boiler and 2x wired Honeywell T3 thermostats.

I am attempting to replace the T3s with two Tado wired thermostats (I checked with them first for compatibility).

The T3 were simply installed with two wires on A and B, like so:

IMG_2647.jpeg

So am I right thinking I need to wire Tado like so? On A and +?

IMG_2646.jpeg

If that's of any help this is the boiler wiring (which I didn't touch):

IMG_2638.jpeg
IMG_2640.jpeg


Thanks

Comments

  • johnnyp78
    johnnyp78 ✭✭✭
    You should have got instructions from Tado. You can also Google ‘Tado wired thermostat manual’. Don’t wire anything to the low voltage connections to the right of the thermostat unless you want to destroy it.

    Look at the diagram in the Honeywell thermostat. A is l, b is com. Follow the instructions in the tado manual for 230v relay. A to NO and b to com.
  • aleoo
    aleoo
    That’s what I was a bit worried about… now it makes sense, thank you kind stranger :)
  • johnnyp78
    johnnyp78 ✭✭✭
    Just realised I got the connections the wrong way round. Should still be ok but actually l (a) goes to com, b goes to no.
  • aleoo
    aleoo

    well it hasn't exploded so far so that's a good sign, but I'll change it then...

  • johnnyp78
    johnnyp78 ✭✭✭
    Shouldn’t make a difference but you might as well follow the diagram.

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