cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 
Help
Replies are disabled for this topic. Start a new one or visit our Help Center.

I. just bought a nest 3 thermostat used and no instructions therre are only two black wires coming

cameronnobble
Community Member

‎03-19-2024 02:30 PM

there are only two black wires coming out of the wall which when connected start the furnace. i bought a nest 3 ussed without instructions on the wall plate which spots do i connect the wires to?

0 Kudos
Reply
1 REPLY 1

Markjosephp
Community Specialist
Community Specialist

‎03-23-2024 12:25 PM

Hello cameronnobble,

Thanks for reaching out! Connecting a Nest Thermostat without instructions can be tricky, but I can help guide you through the process.

Typically, with a two-wire setup where the wires are black, one wire is for power and the other is for heating. However, without knowing the specific configuration of your HVAC system, it's essential to proceed with caution. Do they have labels for which terminal they should go to? While it's common for thermostats to have labels like "R" for power and "W" for heating, Nest uses a different labeling system. Look for terminals labeled "Rh" and "W1.".

If you're unsure about the wiring or have any doubts, it's best to consult a professional HVAC technician. They have the expertise to safely install the thermostat and ensure it works correctly with your HVAC system.

Best regards,
Mark

0 Kudos
Reply