I just bought a new house with a Trane heat pump. It's a XR12 2TWR2036A1000AB, with a variable speed air handler, TWE037E13FB1. It has electric auxiliary heat, but beyond that I don't know much about it.
I'd like to install a Nest but I'm having trouble identifying my wires for compatibility.
Can somebody help me sort these wires? I believe most of them are fairly standard, and I think X2 is for the emergency heat, but I don't know about F. Maybe it's the fan control? Is the variable speed fan controlled by the thermostat or by something in the heat pump? Can the Nest handle a system like this, or would I be better off using another type of thermostat? Also, where is the control panel located so I can see if the wires are labeled differently on the unit?
Thanks.
I'd like to install a Nest but I'm having trouble identifying my wires for compatibility.

Can somebody help me sort these wires? I believe most of them are fairly standard, and I think X2 is for the emergency heat, but I don't know about F. Maybe it's the fan control? Is the variable speed fan controlled by the thermostat or by something in the heat pump? Can the Nest handle a system like this, or would I be better off using another type of thermostat? Also, where is the control panel located so I can see if the wires are labeled differently on the unit?
Thanks.