Wiring Nest Heat Link to Vaillant Ecotec Pro 28 (duplicates merged)

[Krzysztof UK]

Hi All,
I have got question on installation Nest Heat link to boiler. I have got Vaillant Ecotec Pro28. I currently have Honeywell thermostat and receiver (wiring) has been shown on picture attached. Should I do exactly the same as on the picture above ie:
N to N
L to L
With yellow/ green cable going to 3
And loop done between L and 2?
Please advise.

kind regards

krzysztof

 

[muggles]

L to L
Link L to 2
N to N
A to 2
B to 3

 

[Krzysztof UK]

Hi Muggles,

Thank you for your reply.
Am I right saying that A and B I can find in boiler control/board itself therefore need different cable to connect to boiler?

Many thanks for your help.

 

[CBW]

Is this current receiver wired into the boiler already? If so, then just transfer wiring as per Muggles.

 

[muggles]

Hi Muggles,

Thank you for your reply.
Am I right saying that A and B I can find in boiler control/board itself therefore need different cable to connect to boiler?

Many thanks for your help.

No, you should not access your boiler's electrics. They are behind the room sealing cover which should only be removed by a Gas Safe Registered Engineer. You just transfer the existing wires in the Honeywell receiver to the Nest Heat Link as I've described