Nest Power Connector - Taco Sentry Valve install

[iPop]

I have heat only system with 3 zones controlled by Taco Sentry Zone vales (taco z075t2-2). Wiring seems to be according to this diagram:

All instructions for Nest Power Connector I can find assume that my system has C wire. Mine doesn't. 

How can I connect Nest Power Connector in this setup?

[Camps]

You can't 

[Jeran]

Thank you for helping out on this thread, Camps!

Hey there iPop,

I'm just checking up on this thread, do you have any more questions or need any additional help?

Best regards,
Jeran

[EdwardT]

Hi iPop,

I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.

Thanks,

Edward

[Jake]

Hey there,

I wanted to check in, and let you know that I will be locking the thread in 24 hours.

Best regards,

Jake