Hive active heating to replace Drayton digstat RF3 on Baxi Duo tec combi

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Hi,

Novice with boilers, but have an existing wireless thermostat / receiver attached to my Baxi Combi 28 he, that I want to replace with a Hive unit.

Taking the face plate off the existing receiver reveals 6 connectors with only 4 used. Standard neutral and live, plus A, B, C with only A and B connected.

A is connected to 230v live out on the boiler, and B is connected to switched live in on the boiler.

Anyone help with telling me what these should be attached to on the Hive unit? Ive common, heating off, and heating on to choose from!

Should there be any additional wiring?

Few pics attached for reference

Thanks
 

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You are fortunate; yours is an easy conversion, and all of the wires you need are present. As you don't say what your existing receiver is I have assumed from the photo that it is a Honeywell BDR91.

The existing Neutral (N) and Live (L) will go to the Hive receiver N & L respectively, to provide it with a 230V mains supply.

The wire presently in A will go to the Hive 'Common' terminal (1)

The wire presently in B will go to the Hive 'Heating on' terminal (3)

Put the 'floating' earth, in the earth tether.
 
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