Honeywell RTH221B Owner's Manual

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The main purpose of the Honeywell RTH221B thermostat is to regulate the temperature in the room where it is installed. To start operating the programmable thermostat (RTH221B1000, RTH221B1047, RTH221B1021, RTH221B1039) and select the correct operating modes, read owner's manual, which contains 16 pages in English.