Replacing thermostat with Google Nest on Natural Gas and Heat Pump HVAC system

[TexasNester]

My HVAC unit has Natural Gas and a Heat Pump.    The existing thermostat appears to be incorrectly installed because I do not have a setting that allows the heat pump to run: both "Emergency Heat" and "Heat" burn natural gas.  I have the existing wires:

C, O, E (with jumper to W2), R, G, Y

https://www.amazon.com/photos/shared/uZYPNuwhR7eimb-uah0yjQ.HdaRZd7sSNexoItwMI2uNA

If I tell the Nest system that I have 

C, O, E, R, G, Y

It tells me to connect the following wires but I am not sure how I will get natural gas heat with this:

https://www.amazon.com/photos/shared/3NcNi271Rc-4Wmy_45Czyw.q16ccu1g1ZxL0klXE-uIuh

https://www.amazon.com/photos/shared/vSDQSedtQqWvs9vWXTpCmw.Kj1PxfqawOK7mBHpYKe8w_

Thanks in advance for your input!

[Patrick_Caezza · Accepted solution]

Your current system doesn't have a separate emergency heat function, and they are connecting the emergency heat switch to the Aux heat, which allows you to turn only the Aux heat on manually.

You can use any Nest thermostat.

Try this wiring

Blue - C to C

Orange - O to OB or */OB

White - W2 to W2 or W (set as Aux heat)(Jumper to E not needed)

Red - R to Rc or R

Green - G to G

Yellow - Y to Y1 or Y

The "or" is for the Google Nest Thermostat wiring

[Markjosephp]

Hello folks,

I wanted to ensure that everything was covered here.

Thanks for the help here, @Patrick_Caezza.

@TexasNester, I hope you've got the answer you're looking for in terms of your system's compatibility with the Nest Thermostat. You can follow his wiring guide as your reference before installing. Also, please let us know if you need more help.

Regards,

Mark

[TexasNester]

His recommendation worked!

Thanks

[Jenelyn_O]

Hi there,

I'm glad that the issue is now fixed. Please let me know if you have any other questions or concerns, as I'll be willing to assist you further. Otherwise, I'll be locking this thread after 24 hours.

I appreciate your help, @Patrick_Caezza, and Mark. 

Best,

Jenelyn

[TexasNester]

This worked for me Patrick!

Thanks for the help!