Emerson W/E Compatibility with Nest Thermostat

[MSands1]

Hi,

I have an Emerson model 1F85U-42PR that has a W/E wire not listed on Google nest compatibility checker. I noticed my wiring looks a little different than other posts on the forum. I attached pictures of the wiring and the HVAC systems. Is this thermostat compatible? Where does the W/E wire connect on the nest? 

[MSands1]

The HVAC has an outdoor heat pump: Carrier model 25HBC524A300. The picture won't load on the post for whatever reason. 

[HLy]

W/E should go to W2/Aux on the nest.  You also need a c wire.

[Markjosephp]

Hello folks,

I wanted to stop by and see how I could help.

Thanks for helping here, @HLy.

@MSands1, your system is compatible with Nest Thermostats. You can follow the same wiring setup as your current thermostat has. Please make sure to configure it properly during the setup according to their terminals. You can also check your system’s compatibility before purchasing a Nest Thermostat with our online Compatibility Checker.

Regards,

Mark

[MSands1]

Hi Mark, 

Could you clarify which wire the W/E would connect to on the nest? 

Thanks,

Manny 

[Markjosephp]

Hi MSands1,

If your heat pump has emergency heating, the wire should go to the *star terminal, which would work for the Nest Learning Thermostat in your case. If you don't have one but instead have a separate heating system, such as a furnace, the wire would go to the W or W1 terminal for heating. Please check out this article and let me know if you have more questions.

Regards,

Mark

[Markjosephp]

Hey there,

I'm checking back in — how's it going? Have you tried installing your Nest Thermostat? Please let us know if you need more help so we can assist you right away.

Thanks,

Mark

[Markjosephp]

Hi MSands1,

It has been a few days since your last reply, and I am going to lock the thread within 24 hours. If you have any questions, please feel free to create a new post.

Thanks,

Mark

[MSands1]

Hi Mark,

I am trying to figure out if my heat pump has emergency heating or not. Going though the old thermostat settings for an answer. 

[Markjosephp]

Hello there,

Thanks for getting back to us, MSands1. You can also check the make and model of your HVAC system so we can help you determine if your system has an emergency heating system.

I'll look forward to your response.

Regards,

Mark

[EmersonB]

Hello everyone,

@MSands1 I'm dropping by to ensure that everything is covered here. How's it going with your Nest Thermostat? We would appreciate it if you could share with us the information we're asking above. So that we could take a closer look and assist you further.

I appreciate the help, HLy and Mark.
  
Thanks,
Emerson

[EmersonB]

Hey MSands1,

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let us know.

Best,
Emerson