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Refrigerant Pipe SizingGeneration I (Non-Wifi) York Residential Communicating Control (Non-Zoning) Rev 1.2
Generation I (Non-Wifi) Residential Communicating Control (Zoning) Rev 1.10z
Generation II (Wifi) Residential Communicating Control (Non-Zoning) Rev 3.01
Generation II (Wifi) Residential Communicating Control (Zoning) Rev 3.00
Generation I & II (Wifi & Non-Wifi) Residential Communicating Control (Non Zoning) Rev 3.06
Generation II (Wifi) Residential Communicating Control (Non-Zoning) Rev 3.08nz
Generation II (Wifi) Residential Communicating Control (Zoning) Rev 3.06z
To update firmware on YORK thermostats, right click appropriate file above and download file for either zoning or non-zoning application. Unzip and put individual files on the root of an empty thumb drive. Interupt power to thermostat, plug in usb drive, using the adapter supplied with thermostat, reenergize power to thermostat and follow prompts on screen. Allow it to install multiple times, could take between 10-30 minutes.
Software Downloads directly from York