Old Honeywell Thermostat Wiring Diagram

The main trouble is dealing with those different colored wires knowing which one does what and if that wasn t enough you also have numbers and letters to deal with. Identify each wire using the letter of the terminal on the old thermo stat fig. At left the thermostat wiring diagram illustrates the typical wiring connections when installing a honeywell rth2300 or similar programmable room thermostat.

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If you check the honeywell thermostat ct31a1003 wiring diagram you ll see that it requires only two wires.

Old honeywell thermostat wiring diagram. Honeywell thermostat wiring diagram 4 wire examples. If you have a system that both heats and cools your house you need a more complex thermostat with more wire terminals and if your system incorporates a heat pump you need even more wire terminals. Do not label the wires by color. Connect a wire to the terminal by either inserting it straight between the screw and the contact plate or wrapping it clockwise around the screw.

Label the wires using the wiring labels that came with the ct87. Ct87a b j roundﬁ thermostat 3 69 0274 6 5. The table above provides a more complete list of honeywell thermostat wiring colors and their uses. This is because it s a very basic thermostat designed only to control a heating system.

From smart wifi thermostats with room sensors and humidification control to programmable and non programmable thermostats resideo products meet a variety of needs. Be sure to identify and label the existing thermostat wires before disconnecting them from the terminals on the old thermostat you are replacing. C 24 vac common you might see blue purple or brown typically used for this wire. Check the honeywell thermostat wiring diagram in your owner s manual for more details.

But here is a list of the most common wire color mappings as seen in many four wire t stat setups. Disconnect the wires from the old thermostat and wrap them around a pencil to keep them from falling. Heck now i m not calling anyone a dummy. Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat.

Take control of your home comfort and save on energy costs with a range of honeywell home thermostats from resideo.