InstallNest from old Honeywell A B wire

[natopigro]

Hello all,

this is my wire configuration in my old Honeywell thermostat. How I am supposed ti connect the A B wires?

Thank you

[Markjosephp]

Hello natopigro,

Thanks for reaching out to the Google Nest Community Forum. I'd love to help.

It appears that you have Proprietary system, which are designed by the manufacturer so that they can’t work with other thermostats. But some proprietary systems may also have the option of using standard heating system wires. Contact a Nest Pro to see if your proprietary system can be rewired to work with Nest.

Please let us know if you have more questions.

Best regards,

Mark

[Markjosephp]

Hi there,

I wanted to see if you still needed help. Please let us know if you have any other questions or concerns.

Thanks,

Mark

[Jhonleanmel]

Hi everyone,

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.

Thanks,
Mel