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I currently have a Honeywell TH9421C1004 thermostat installed with three wire 1,2,3. These wires are connected to a honeywell EIM which is connected to furnace unit. Ecobee support tells me that ecobee thermostat does not work with EIM setup and if i want to install Ecobee I must replace the EIM with Honeywell HZ322 zone panel.
I first of all do not understand why i have EIM in my current setup? And is it the right thing to replace the EIM with HZ322 ? i will try to explain my current setup:
Two furnace units with two outside condensers. Electric cooling and gas heating. One unit is installed in basement and the other in attic. Each unit supplies heat and cold to the respective areas of the house. I.e attic one for upper level and the basement one for lower level. Both the units are setup as single zone. 1 stage cooling and dual stage heating. The lower level furnace also has apriliare humidifier and an outdoor temprature sensor To meassure outaide temprature. There is no dehumidifier or ventilation enabled on either of the floors. Some times i notice that the fan is running without the heating or cooling So i am not sure what causes that. There is no connection between attic and basement furnaces as both of these operate independently by their own thermostat and EIM.
For above setup, do I really need an EIM? And if so what benefit is EIM adding in my current setup? Apologies to sound so ignorant but I bought the house recently and the previous owners did not explain the furnace setup to me. I am also not an HVAC expert.
I want to replace both the IAQ thermostats with ecobee3 so i can control the temp settings remotely, what is the best way to replace my current setup with ecobee3 without paying 100s of dollar to a HVAC professional?