Installing Nest with 8 wire thermostat. How do I wire the Nest?

[ROBIII]

[laurentbourg]

Please describe your hvac system? This looks like a heat pump setup with alternate heat, such as gas forced air. 

[ROBIII]

That is correct. It is an American Standard heat pump.

[ROBIII]

With gas as well

[Patrick_Caezza]

Yes, your current thermostat is compatible with any of the Nest thermostats.

I would suggest wiring it like this.

Red - R to Rc or R

White W1 to W2/AUX or W

Yellow Y1 to Y1 or Y

Green - G to G

Orange O to OB or */OB

Blue - B to C

Black T1 - not used, tape off

Brown - T2 - not used tape off

The "or" is for the Google Nest Thermostat

[Tatemalone]

HI I saw that you seem to know what you are doing. I bought a white nest thermostat but my old one has 8 Wires. My Current Honeywell I saw your guide above but I was wondering if it is the same for my thermostat or different?

[Gclem]

With black and brown wire taped off will my heat pump still work the same way as when wired to previous thermostat?

[Drafyn]

Hey Patrick, thanks for the info you put out. I have this exact same 8 wire set up and just bought the Nest Thermostat which only has 6 wire openings. If I connect this and not use the brown or black wires, do I need to get a C-wire from Google, or does that setup you mentioned have the C-wire from that blue wire?

[Tdiamond]

This is my 8 wire set up trance heat pump and gas , fuel fuel . Will it work on just hooking up the 6 wires

[Tdiamond]

8 wire trane fuel fuel, what is the wiring diagram 

[c411i3]

I called the nest support and they walked me through which of the 8 wires to install in the 6 nest spots. Apparently two of the wires on my Honeywell (S1 & S2) were for sensors that don't need to be used with the Nest.