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RTH221 - read user manual online or download in PDF format. Pages in total: 40. Scheduling daily temperature control is easy with Honeywell's 1 week remove your existing thermostat and follow step-by-step instructions for installation. RTH2300/RTH221. 11. 69-2448EF—03. About your new thermostat. WIRING. ASSIST. ANCE Advanced Installation Guide. 69-2448EF—03. 12. About your View and Download Honeywell RTH221 Series quick installation manual online. RTH221 Series Thermostat pdf manual download. Also for: Rth2300 series. 14 Nov 2016 Owner's Manual Call 1-800-468-1502 for wiring assistance before returning . Your new Honeywell thermostat has been designed to give you many years of. Honeywell RTH221 Series Pdf User Manuals. View online or download Honeywell RTH221 Series User Manual, Owner's Manual, Installation Manual. Figure 2. Figure 3. Jumper. Rh, 4 or V. R. W1 or H. Y1 or M. F. RTH111/RTH221. Installation Guide. Programmable and Non-programmable Thermostats Manual. RTH2300/RTH221 Series. Programmable Thermostat. 69-2727ES-01 .. Make sure fresh AAA alkaline batteries are correctly installed (see page. 16).Quick Installation Guide. Identify System Type. This thermostat is compatible with the following systems: Gas, oil or electric furnace. •. Central air conditioner.