Power to nest thermostat

[Qwerk]

Can I power a nest thermostat directly from a 3 or 5 amp fused spur and then have it communicate via wifi to the heat link ?

[Frustratedddd]

Are you asking if you can run a cable from a 240v powered spur direct into the base connector of the display?

Then run a 240v cable direct into the Heat Link to power up

Then the Heat Link and display will talk to each other via WiFi?

[Qwerk]

Yes , but after some research I realised that the display needs a 12v DC supply.

I’ve seen on other threads that people have powered their display with a 12v dc driver/transformer and then the display and heat link will talk to each other wirelessly.

Will this be ok ?

[Qwerk]

Obviously the heat link will have a separate 240v input 

[Frustratedddd]

That's why I asked the question, as the display is 12v!

You would not believe how many thermostats I have repaired after 240v has been connected to the display directly.

Simple answer, yes you can.

The base plate has a USB connection where you can also connect with a charger, like a phone charger. 240v needs to be stepped down to 12v, and that can be done with a transformer. Fuse at the spur as low as possible 1A or lower if possible. Linking from display to H/L can then be done WiFi.

No research to be done, the instruction manual shows the correct connections.

https://nest.com/support/images/misc-nest-thermostat-eu/gen3-install/3rd-gen-Nest-Learning-Thermosta...

[UanaC]

Understood. If you don't want your thermostat to be wired, you can try to buy a Nest stand for it. You can follow this link to check the Nest stand: https://goo.gle/2RB67vs. The stand contains a USB cable that needs to be plugged into your thermostat base and it will give the necessary power. 

[UanaC]

Hello there! Thanks for posting. For the fuse that's connected to your Heat Link you'll need to use the one that has 3 amp. You can find more about this in the installation guide. Here's the link for the installation guide: https://goo.gle/2pTMYLC.

Many thanks, Oana.

[Qwerk]

Thank you . 
What about to power the display if I didn’t want to run a cable from the heat link to the display with the T1 T2 terminals ?

Could i power the display separately with a 12v dc driver/transformer ?

[UanaC]

Hello there! Just checking in with you. Did you see my message from above?

[Qwerk]

Yes thank you very much

i am going to power the display from the T1 T2 terminals from the heatlink

many thanks 

[UanaC]

Hello there! Just checking in with you. Is there anything else me or my colleagues can help you with? 

[AlexD]

Hey there, I haven't heard from you in a while so I'll be locking this thread. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community. Thanks, AlexD.

[UanaC]

Also, I forgot to mention that the Heat Link contains the transformer inside. So, when you connect the T1 and T2 wires from the Heat Link to the display you already have 12V. 

[Paul_R]

Hi there @Qwerk! I'm glad that the answers of my colleagues clarified the situation for you. Would there be anything else I or my colleagues can assist you with?