Thermostat Data Wire

The common wire sometimes referred to as the c wire is what s responsible for delivering constant power to your thermostat.

Thermostat data wire.

Thermostat wiring and wire color chart thermostat wiring colors code. Use our tool to determine which thermostats work with your home s existing wiring. These wires are responsible for switching the changeover valve in a heat pump system. This article explains just what wire at a room thermostat actually controls.

See the diagram below for what each wire controls on your system. If your current thermostat has a wire in the c terminal. R the r terminal is the power. The thermostat uses 1 wire to control each of your hvac system s primary functions such as heating cooling fan etc.

The o wire reverses the valve from heating to cooling and the b wire switches the valve from cooling to heating. Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat. Ecobee thermostats do not support three stages of cooling. Color of wire and termination.

Heck now i m not calling anyone a dummy. Over a long distance the signals can become to weak to get a reading. Using a pocket knife trim off 1 4 of the colored coating to expose the wire. A wire connected to the y3 terminal on your current thermostat indicates that you have a three stage cooling system.

The larger 18 ga. The nest app won t tell you to connect one do not connect a c wire to your nest thermostat unless the nest app tells you to. This data can also be helpful if thermostat wires have become mixed up or improperly color coded by allowing you to trace wires back to their control connection point. 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.

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 wire reference chart. 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. If you see a wire connected to your current thermostat s w3 terminal we recommend booking a pro near you to install your ecobee.

S indoor and outdoor wired sensors. If your current thermostat doesn t have a wire in the c terminal. A thermostat wire uses low voltage signals to transfer data. Wire helps transmit data over a longer distance.

Y compressor stage 1 cooling. The wiring diagram that you ll get from the nest app will tell you to connect the c wire to your nest thermostat. Knowing what each thermostat wire does can help in wiring up a new or replacement room thermostat. Thermostat wiring for dummies.