Replacing Honeywell BDR91 with Tado receiver.

[mylesw]

Hi all.

I have seen this question has been asked before but the current wiring in my BDR91 is slightly different. In other posts I have seen, none have an earth to the ‘B’.

I am hoping it’s a case of swapping over the wires.

I assume it should be wired as below.

BDR91 – 1x Blue Wire in N
TADO – Supply N

BDR91 - 1x Brown Wire in L
TADO – Supply L

BDR91 - 1 x black Wire in A
TADO - Central Heating (CH) - COM (1)

BDR91 - 1 x Earth Wire in B
TADO - Central Heating (CH) - NO (4)

Thanks

 

[ericmark]

The green/yellow is not earth, it has been over marked, this should not be done, but clearly works, so you have to decide keep as is, or wire correctly.