Kind of depends on where the wires are connected at the unit. Not all techs follow the same color code. Since there is no NEC code for it.
It has been to long time to be honest with you. This is why I am here on the site to get a visual connection or be told exactly "which wire goes to what letter"? From a Trane sysytem to a honeywell from Home Depot. Thank you!which wires went where on the old stat?!