Wire connect

[Stoneshi]

I have the older one connect with k ,I don’t have a and y1 

[gmelanymelissa]

Hi @Stoneshi,

Thanks for posting here in the community. I understand your concern about how to properly connect your Nest thermostat since you don’t have A and Y1 wires. I'm happy to help!

To better understand the situation, I'd like to ask a few questions:

• What is the model of your Nest thermostat? Here’s a helpful article about how to identify your thermostat model.
• What is the make and model of your HVAC system (conventional or heat pump)?
• Would you mind sharing a picture of the previous wiring installation and the current on the Nest thermostat?

Once I have these details, I can assist you better with the specific information.

Keep me posted.

Regards,

Melany