I recently had a technician install a new ecobee thermostat, but he disconnected the control board from on top of the furnace. he bypassed the board to install the thermostat. Is there a way to manually wire the aprilaire fresh air circulation into the thermostat, or is it better just to remove that from the system? I have another thermostat I am looking to replace which will be in the same situation. There are only 3 wires to the builder installed thermostat (red, white, and blue) labeled 1,2, and 3 respectively.