Installing the Y8610 U 3003 in a Dayton 3E240 unit heaterthermostat.. Heater has 3 (W-R-Bl) wires coming from, I assume the internal fan thermostat. Having trouble figuring out where to put these 3, with the wire coming from the th-w terminal on the module and the 2 thermostat wires from the regular thermostat. I know I need one 24v from the transformer. Do I need a 3rd wire to go to the thermostat? I have the orange wire from the 24v GRD to the ground terminal on the gas valve. Is that OK or should that go to the ignitor or chassis? I need the black wire from the th-w terminal on the module to go where?

Thanks for the help.