Replacing an old thermostat
Hello,
I am trying to replace an old honeywell mercury thermostat with a new rht8500 honeywell thermostat.
I only have heating at home with 2 wires (Black and White) coming from the furnace to the old thermostat. There are no labelling what-so-ever on the old thermostat.
Can anybody help as to how to connect the 2 wires to the new one.
On the furnace side, the white cable is connected to the TH and the black cable is connected to the TH-TR
BTW, does anyone have a chart as to what the RC,R,W,Y,G,C,Y2,W2 stand for or mean in honeywell thermostat, same for TH TH-TR
I searched the net but found nothing.
Thank You