*5-Wire Help*

[Jrod2244]

I have a 5-wire thermostat in my apartment that has died. I picked up a Google Nest thermostat and I'm a bit lost when it comes to wiring.

Old wiring - 

• Green wire - G
• Black wire - B 
• Orange wire - Y bridged to W
• Red wire - Rc bridged to Rh 
• White wire - C 

the terminals on my new unit are 

Y, C, W, G, R, OB*

Any help is much appreciated 

[SoriaD_]

Hello @Jrod2244 

We are so happy to see you here. Let me help you with this wiring configuration.

I have some doubts about this description. To be sure of my answer, could you tell me if your system uses a heat pump or is it a conventional system? Does it work with heating and cooling?

Feel free to share more details with me, and definitely I will do my best to find an answer for you.

Best regards,

Douglas.

[Jrod2244]

Hey Douglas, 

I believe it’s a heat pump unit in my apartment. I wish I could send pictures in this thread because I was kinda puzzled looked at the wiring on the old thermostat. 

the system does both heating and cooling. 

If you need me to pull readings using a multimeter, I’m more than able to. 

let me know what you think. 

-Jerod 

[SoriaD_ · Accepted solution]

Hi @Jrod2244 

Thanks for following up!I appreciate the detailed information you provided. Let's try to find an answer!

With your description I suggest following the next configuration on your new Nest Thermostat:

• Green wire - G
• Black wire - OB 
• Orange Wire - Y
• Red Wire - R
• White wire - C

Always keep in mind your security when managing the wires. And if you have some situation we can try to swap the "OB" wire with the "Y". 

Feel free to keep us posting in case you need more assistance. I'm here to help you.

Best regards,

Douglas.