Honeywell rth9580

[finn1212]

I am trying to install my new rth9580 to replace my current Honeywell Trol A Temp T87F with a second zone satellite location, has different wires. I have reviewed the videos and am still unclear. Please see attached picture. There is an O wire but my system is not a heat pump! Best I can think of is that I must use the G wire but am worried I will then not use all wires and parts of system won’t work. I have installed thermostats before but this is a bit different. I have 1 gas furnace with heat/AC that is 12 years old.

[Paul Z.]

You have a board that needs a thermostat with a "O"-"B". not O/B. You do not have heat pump, the "O" puts the board into A/C. Call the office for more info.