From Ruud Thermostat to nest learning thermostat

[Ingcafriser]

I purchased a nest learning thermostat but I am having trouble cross referencing the wires. See picture of my old thermostat and help me to understand how do I connect the new thermostat 

 

[Patrick_Caezza]

First, we need to figure out how the B and O terminals are configured.

The B terminal is used for the reversing valve which selects between heat and cooling. The B means when energized it selects heat and the O terminal is used to select cooling when energized.

You need to look at the wiring in the furnace/air handler and see what the thermostat wires are connected to and post that here.  I need to know what the blue (B) wire and the orange (O) wire are connected to. If you can also post the make and model number of the furnace/air handler here it would help.

[Ryan_G]

Hi Ingcafriser,

Thanks for reaching out here in the community.

I'd like to jump in here and check if you've seen Patrick_Caezza's response. Let us know if you need more help by replying to this thread.

Best regards,

Ryan

[aatienza]

Hey Ingcafriser,

Chiming in to check if you still need help with this?

Feel free to respond to this thread if you have additional questions or concerns and I'd be glad to answer it for you.

Thanks,

Archie

[aatienza]

Hey Ingcafriser,

I'd like to bump in here to make sure that you've seen our response.

Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Have a great day.

Thanks,

Archie