Honeywell BDR91 to hive

Abdul Ahad · 27 Nov 2019

Hello,

Looking to upgrade thermostat. I have a valliant combi boiler and it has honeywell BDR91 installed with CM927 . Please see the picture of the wiring.

Can someone guide me which Hive to buy from amazon as there are so many options and how to connect the wires.

Thanks

stem · 27 Nov 2019

As you don't mention any hot water control, I assume the BDR91 is connected to a combi boiler, and that you don't have a hot water cylinder. If that's right you require the Single Channel Version of the Hive, and it connects as follows:

Blue now in N to Hive N
Brown now in L to Hive L
Black wire now in A = Hive Heating on 3
Use the link wire to join Hive L to Hive Com 1

Abdul Ahad · 27 Nov 2019

Thanks a lot.

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Honeywell BDR91 to hive

Abdul Ahad

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