Nest Thermostat, compatibility with r-rc jumper

[jefv19]

Hello

I have an AC unit, it is only AC no heating. I have 2 identical units, on the first and second level. On the bottom level I have a Nest Learning thermostat with no issues, but on the second level I decided to buy a Nest thermostat since its cheaper and will not be used as often. But when installing and setting up the wires in the app it comes up as incompatible. Still i conected everything in the R Y and G, and it appears to work, but I'm worried it may damage the compressor or something else.

Does anyone now if the app is wrong or it really is incompatible?

Attached my old thermostat

[CoolingWizard]

If you set up the thermostat with R, C, Y it would be incompatible.  Remember the less expensive Nest thermostat only works with Google Home and will not work with the Nest App.

The AC Cooling Wizard

[jefv19]

Hi Sir, thanks for answering, yes Im ok with only google home. But Im setting it up with R,G,Y. I do not have a C wire

[CoolingWizard]

Since you do not have AC wire, the nest, second generation, and third generation learning thermostat, can’t find enough power going down the W or the Y wire and reaching the common side of an electrical contactor coil. By chance, do you have any wires not being used as part of the thermostat cable?

The AC Cooling Wizard

[jefv19]

On the wall there is no other cables, I will ask to check on the unit itself

[CoolingWizard]

The cable that your thermostat is using is actually a telephone cable. If you notice there are two different colors, you see there’s one it’s blue with white stripes, and then there’s a white one with blue stripes. There’s also an orange with white stripes, and then there’s a white one with orange stripes. so your blue cable is currently a blue cable with white stripes and there Hass to be a white cable with blue stripes inside the cable. Perhaps they cut it off. If you can find that one, we can make it the common wire.

The AC Cooling Wizard

[Jenelyn_O]

Hi there,

Thanks for reaching out. I'm sorry for the delay. I just want to confirm if you were able to see the information provided by CoolingWizard. Please let me know if you still have questions or concerns, as I'll be willing to assist you from here. 

I appreciate your help, @CoolingWizard.

Best,

Jenelyn

[EmersonB]

Hi everyone,

@jefv19, we wanted to follow up and see if you were able to fill out the form? Let us know if you have additional questions.

I appreciate the help, Jenelyn and CoolingWizard.
 
Regards,
Emerson

[jefv19]

Hello yes in the end i decided to buy a learning thermostat since that is definetly compatible. Thank you all, specially Coolingwizard!

[Markjosephp]

Hi jefv19,

Awesome! Thanks for the update and for your interest in the Nest Learning Thermostat. It looks like we have come to a solution, so I'm going to lock this thread in 24 hours. If you have any other concerns or questions, please feel free to create a new thread.

Regards,

Mark