Thanks for reaching out. I'd love to know more about this. Are you trying to setup the new AC to your Nest Thermostat? I'm afraid we can only do this when you have access to the Nest Thermostat since we'd have to do it on the display of the Thermostat itself.
We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.