Finished up my dads stove install but now need to tackle the thermostat wiring so the blower runs on a call for heat and the oil furnace only runs when it drops to a lower point. I have read numerous posts on this and saw these instructions that utilizes one thermostat and will do exactly what I need it to
Red to Rh or Rc with jumper between the two.
Green to G and W/E with jumper between the two
White to the W2 for gas furnace
Yellow to Y for cooling.
My only problem is that his furnace is older, and it only has a two wire thermostat, just an old round honeywell that runs to two terminals marked T and T, and the fan is controlled by a limit switch, there is no relay or transformer. My question is how can I accomplish a one thermostat setup with his current setup or does it need to be done with two thermostats. It doesnt matter either way if one will work great or if he needs two thats fine, but all the reading Im doing they all have more than two wires so do I need to convert his oil furnace to a 24v setup or will the old wiring work, also his furnace does not have any AC. I appreciate any help