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Honeywell RTH230B Installation Manual. The RTH230B programmable thermostat can be used to control: a gas, fuel oil or electric furnace - 2 or 3 wires; a central View and Download Honeywell RTH230B user, service and care free manual online. 1, Honeywell-RTH230B instructions manuals, English, 469.97 KB, DOWNLOAD. The RTH230B programmable thermostat can be used to control: RTH230B. Programmable Electronic Thermostat. Installation and User Guide. Display. Programming a Honeywell RTH230B thermostat is simple when you follow the instructions in the owner's manual. This thermostat allows you to program fourThe RTH230B programmable thermostat can be used to control: • a gas, fuel oil or electric furnace - 2 or 3 wires • a central air conditioner - 2 or 3 wires