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- 10 Dec 2019
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I am trying to upgrade my existing Honeywell BDR91 to the third generation Nest but would like a bit of help with the wiring before I jump in. This is how things are currently connected:
https://imgur.com/rrt3jdx
So the live and neutral wires coming from a fused spur are in one side of a connector block along with the live and neutral wires going to the boiler. In the other side of this connector block are the live and neutral going to the relay.
The earth wires are just in connector blocks.
Then the grey and black wires going to the boiler are connected to A and B in the relay.
As I understand it when connecting the Nest:
N = N
L = L
A = 2
B = 3
There is no space in the new Nest box for the connector block with the live and neutral wires connected so I am a little unsure of how to proceed.
https://imgur.com/rrt3jdx
So the live and neutral wires coming from a fused spur are in one side of a connector block along with the live and neutral wires going to the boiler. In the other side of this connector block are the live and neutral going to the relay.
The earth wires are just in connector blocks.
Then the grey and black wires going to the boiler are connected to A and B in the relay.
As I understand it when connecting the Nest:
N = N
L = L
A = 2
B = 3
There is no space in the new Nest box for the connector block with the live and neutral wires connected so I am a little unsure of how to proceed.