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THX9421R5021WW Basic Prestige® 2-Wire Thermostat with RedLINK® ; Program Modes, 7-Day Programmable, Manual / Not Programmed ; Fan Function, On, Auto, Circulating. Operating Manual. 2. 69-2493EFS—01. Control fan operation. (see page 5). Display home screen. Change date or time (see page 4). Outdoor temperature. sensors, refer to the mounting instructions in the Alerts and Delta T Diagnostics Installation. Instructions packed with the Prestige IAQ 2.0 kit. Honeywell YTHX9421, THX9421R5021WW Manual ; NOTE: When installing multiple thermostats and EIMs, mount the EIMs at least 2 feet apart for best RedLINK Appliance manuals and free pdf instructions. Find the user manual you need for your home appliance products and more at ManualsOnline.in. Changeover. Auto or manual. Humidification Setting Range. Cooling: 40 to 80% RH, Heating: 10 to 60% RH.