Thermostat Wiring Black 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.

Thermostat wiring black wire. The black wire may be linked to the c terminal which controls the transformer. Thermostat schematic wire colors. Thermostat wiring and wire color chart thermostat wiring colors code. Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat.

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. This is most often seen in electronic thermostats where only 24 volts are required. The system will not operate correctly if the wires are incorrectly. The common wire sometimes referred to as the c wire is what s responsible for delivering constant power to your thermostat.

During installation the wires are connected to one board that sends certain data through each wire to the thermostat. The wiring for your honeywell thermostat depends on the functions of your heating and cooling system. In rare cases a wire may be in the wrong thermostat connector which can cause your system to malfunction. It s there so you can supply power to the heating and cooling switches with a single wire which is usually red.

You ll probably see a thermostat jumper wire connecting the rc and rh terminals. 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. Blue this is your common or c wire. There are several ways to identify a thermostat wire.

C terminals are connected to the common wire which is most often black but can also be other colors. R the r terminal is the power. Your best bet is to see the manufacturer s documentation both thermostat and hvac. My paperback and e book.

Thermostat wiring for dummies. Color of wire and termination. Take a picture of your current thermostat s wiring. For programmable thermostats and smart thermostats c wires are essential for setting a schedule or having your heat or air conditioner turn on at a desired temperature while some units can run without a c wire even brands like nest recommend having one for optimal.

White heat normally central heating unit can also need a black wire and you might also have a heat pump but white goes into w1 normally orange heat pump normally and goes into o b above rc.