Due to all of the helpful information on this forum, I had the following system intalled.
Furnace: Trane TUD080R9V4, 2-stage, 80,000 BTU, VS, Model XV80
Evap Coil: TE50660C, 3-5 ton coil
Air Conditioning: Trane 4TTX4048A1000a, 14 SEER, Model XL14i.
Here's where I need additional help. I currently have a Robertshaw 9600 digital thermostat. It has the following wired (I know not to go by color of wire alone)
red wire = RC/RH with jumper.
white wire - W
yellow wire - Y
green wire - G
blue & brown wire - not connected to thermostat
I'm interensted in getting the Honeywell TH8320. Will my existing wiring be sufficient or do I need to have the installer back out to take advantage of any spare wires for the 2-stage and/or VS features of my new system?
I live in the San Francisco East Bay. Common to have 100 degree days.
Thank you so much for the excellent advice.
Have the Installer back out.
It's not a D.I.Y. job.
I counted 6 wires for
2 stage heat/1 stage cooling
I had to have new wire pulled.
On the new stat, hook up a common from the stat to the board, also need a W2 from the stat to the board. Make sure you use the advanced setup to tell the stat you have 2 stage gas.