Wiring compat

[Deeznutz970]

I'm thinking of getting a nest thermostat and need to know if my wires will work. It's a older thermostat and has a white and a black single strand wire and a green unused wire

[Houptee]

I assume this is a heating only system since only 2 wires are connected.

The Nest (non learning) you need a C common wire connected and the R + 24v and W for heat.

If you have a C screw terminal on the heating system you can use the extra wire and connect it to C at the heating equipment and C on the Nest.

Post a pic of the heating system where the thermostat wires are connected so we can see if you have a place to attach a C wire.

[Deeznutz970]

It is heat only. It says the picture file is to large. There are only two terminals on the back of the thermostat and it is operated by a spring. The green wood is unused if I could connect that for a c wire on both ends. 

[Houptee]

You need to check the heating equipment to see if it has a screw marked C on the heater.

Is it hot air heat from ducts or is this a boiler with hot water radiators or baseboard?

[Deeznutz970]

I will take a look when I can. It may have had base board heat but is forced air now. 

[Houptee]

If the furnace is fairly new it should have a C terminal if you take the cover off you will see the thermostat wires and a terminal strip with screws R W G Y etc hopefully one says C.

[Deeznutz970]

Thank you I will look as soon as I Gain access,I rent. 

[Markjosephp]

Hello there,

Thanks for helping here, @Houptee. 

@Deeznutz970, I wanted to see if you still needed help. Have you had a chance to check your systems' wiring configuration? Please share us a picture if possible so we can see how it can be labeled with the Nest Thermostat.

Regards,

Mark

[Markjosephp]

Hello Deeznutz970,

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

Thanks,

Mark

[Juni]

Hi there,

We haven’t heard back from you, so I'll be locking this thread in 24 hours. Feel free to create a new one if you have more questions or have other concerns in the future.
 

Best,

Juni