TRH7500D wiring for Traine Weathertron with heatpump
Remove power to your air handler before replacing your thermostat. Write down your existing terminal = color combination. Color codes vary.
Old = New
X2 = E
O = O/B
G = G
Y = Y
R = RC & R (Use provided jumper)
B = C
T = Tape this wire off. Your new stat will not use this thermister terminal.