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Set the clock Honeywell RTH2300 · Press the Set button. Set Time will appear on the screen and the time display will flash. · Press the Up or Down button to setOperating Manual. 69-2727ES—01. 2. About your new thermostat. Your new Honeywell thermostat has been designed to give you many years of reliable. Owner's Manual. Read and save these instructions. For help please visit honeywellhome.com. RTH2300/RTH221. Series. Programmable. Thermostat.