Trane XL824 Nexia Control For use with Conventional 24v Heat/Cool and Dual fuel systems Replaces / Supersedes: Acont824AS52DA , ACONT824 , XL824 , TCONT824 and others Up to 5 Heat Stages/2 Cool Stages 4.3" Diagonal color touchscreen Wi-Fi or Ethernet Connectivity. NOTE: Does not work with traditional wired heating and cooling system of any brand with R ,W ,Y ,G ,C Etc. type of wiring - this Control is only for Trane & American Standard 3-Wire Communicating Systems.