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E wire to W wire (Replacing thermostat)

airplanegeek
Community Member

I'm upgrading two thermostats for two separate systems and doubting the compatibility checker. Both systems are less than 2 years old.

First floor Nest install was straight forward and quick. It controls a package system.

Second floor is where I'm stuck. Thermostat controls a split system (exterior condenser + interior handler). Basically the same Emerson thermostat, but it says E where downstairs it said W. It also uses orange (O/B) where first floor didn't.

So, can I simply insert the white wire from its current E slot to W slot of Nest?

Compress_20220515_112740_0209.jpg

Thank you!!

1 ACCEPTED SOLUTION

EdwardT
Community Specialist
Community Specialist

Hi airplanegeek,

 

Thanks for reaching out. Based on the wiring of the first picture, it looks like it's controlling a heat pump system with emergency heat. Yes, you can connect the white wire to the W terminal of your Nest Thermostat and just select emergency heat during the set up process.

 

Let us know how it goes.

 

Thanks,

Edward

View solution in original post

6 REPLIES 6

EdwardT
Community Specialist
Community Specialist

Hi airplanegeek,

 

Thanks for reaching out. Based on the wiring of the first picture, it looks like it's controlling a heat pump system with emergency heat. Yes, you can connect the white wire to the W terminal of your Nest Thermostat and just select emergency heat during the set up process.

 

Let us know how it goes.

 

Thanks,

Edward

airplanegeek
Community Member

Thanks @EdwardT . Install was quick, and while I couldn't confidently answer some of the type of system questions, i.e. duel fuel, heat pump, etc., the thermostat is connected and functioning great. Emergency heat is off, so I can change that to on based on your comment. Thanks again!

EdwardT
Community Specialist
Community Specialist

Hi airplanegeek,

 

Thanks for the response. Please observe it for now and let us know if you notice anything and we'd be glad to help.

 

Thanks,

Edward

EdwardT
Community Specialist
Community Specialist

Hi airplanegeek,

 

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do. 

 

Thanks,

Edward

 

 

Hello @EdwardT.

I'm all set. Thanks for the help!

EdwardT
Community Specialist
Community Specialist

Hi airplanegeek,

 

Awesome — glad to hear everything is back and working as intended. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

 

Thanks,

Edward