The wiring diagram for that can be found at page 20. The Live wire needs to go into L terminal on the Nest Heat Link and from there, a loop/bridge into terminal 2, and the Switch Live/Normally Open wire needs to go into Nest's terminal number 3. Let me know how it went.. This switched live from the Nest Heat link needs to connect to a white wire of the zone valve. All we have to do is to move call for heat from the Nest Heat link coming to the wiring centre to the white wire of the zone valve.

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Learn how to install a Nest Thermostat in the UK safely. Master Heat Link wiring, 230V connections, and OpenTherm setup for maximum efficiency. Start now!. The Heat Link and Nest Thermostat communicate wirelessly Position the Heat Link such that large metal objects—like the boiler or hot water tank—don't come between it and the thermostat This can block the wireless signal

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