2 pipe fan coil system

[Kylep2122]

Greetings, looking to transition from an analog thermostat on a 2 pipe fan coil system with high/low fan settings and wondering how to wire in the nest thermostat since I don't have a previous digital system to mimic. C-wire would be installed. Picture of the schematic for reference.

 

 

[Patrick_Caezza]

Looking at the schematic you provided, I would say your system is using line voltage which is not compatible with any of the Nest thermostats in America/Canada.

Let me know if I am wrong about the voltage.

[Kylep2122]

No, you're correct and I realized line voltage would be an issue after doing some more digging following my post. A relay could be an option, but not sure if an individual relay would be needed accommodate each fan settings. 

[Brad]

Hi there,

Just checking in on this thread and the activity on it. We'll leave this topic open for another 24 hours in case there are any follow-up questions or comments.

Best regards,
Brad

[Ryan_G]

Hey folks,

It looks like we haven't heard back from anyone and I'm going to lock the thread. If you have any further questions or concerns, feel free to create a new thread and we'll be glad to assist you.

Thanks for your help, Brad.

Have a great day.

Best regards,
Ryan

[Brad]

Hi there,

Just checking in to see how the conversation is going as there's been a lapse in activity on this thread. Thank you, @Patrick_Caezza for all of your help!

Best regard,
Brad