Thermostat Wiring Black Wire

Blue this is your common or c wire. C terminals are connected to the common wire which is most often black but can also be other colors. It is a red wire and comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit.
thermostat wiring black wire

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Its there so you can supply power to the heating and cooling switches with a single wire which is usually red.

Thermostat wiring black wire. If you are building a new home or having your furnace replaced and re wiring you should use the 9 wire thermostat wire like this. Color of wire and termination. Thermostat wire is made of multiple strands of solid copper wire each wrapped individually with a colored shell and enclosed together inside a protective sheathing. Thermostat wiring for dummies.

Thermostat schematic wire colors. Your best bet is to see the manufacturers documentation both thermostat and hvac. Effectively there isnt a second rh wire although there is an rh terminal. The wiring for your honeywell thermostat depends on the functions of your heating and cooling system.

R the r terminal is the power. Thermostat wiring and wire color chart thermostat wiring colors code. The black wire may be linked to the c terminal which controls the transformer. This wire is also known as the rh wire.

You may also have up to two black wires as well but these are used for various heating systems in the north or for outdoor purposes. While there isnt an official standard for thermostat circuit wiring colors there is a general pattern. Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat. Youll probably see a thermostat jumper wire connecting the rc and rh terminals.

But here is a list of the most common wire color to function mappings as seen in many four and five wire t stat setups. This is most often seen in electronic thermostats where only 24 volts are required. However the heating still needs to be controlled so a wire known as a jumper is connected between the rc and the rh terminals so that power gets to the heating control part of the thermostat. During installation the wires are connected to one board that sends certain data through each wire to the thermostat.

Httpsamznto2mtzw7q doing so will ensure future compatibility. The system will not operate correctly if the wires are incorrectly. My paperback and e book. Common honeywell thermostat wiring color code the table above provides a more comprehensive list of honeywell thermostat wiring colors and their uses.

If you only have 4 wires they are typically red yellow green black.