The t-stat comes with EIT module. that wires to the t-stat and the furnace. I'm having trouble with the module to furnace wiring.
from the thermostat you match 1,2,3 wires to the module, from the module to the furnace. - R to R (this is your 24V hot) W to W (furnace 24V input G to G (fan for cooling 24V input) Y to Y (cooling 24V input), there should also be another wire that connects with this that goes to the condensing unit C to C ( Common - must have this connected for IAQ to work) as with the Y, there should be another wire to connect to this that goes to the condensing unit. - maybe W2 to W2 if you have a 2 stage furnace, you'll know if you have a 2 stage furnace because the W2 connection on the furnace will be present. - maybe Y2, if you have 2-stage cooling. if you have a humidifier connect both wires from the humidifier selinoid valve to each of the HUM terminals.
