Thermostat Data Wire

Color of wire and termination.

Thermostat data wire.

Over a long distance the signals can become to weak to get a reading. 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. 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. The o wire reverses the valve from heating to cooling and the b wire switches the valve from cooling to heating.

These wires are responsible for switching the changeover valve in a heat pump system. A thermostat wire uses low voltage signals to transfer data. Thermostat wire reference chart. The common wire sometimes referred to as the c wire is what s responsible for delivering constant power to your thermostat.

Knowing what each thermostat wire does can help in wiring up a new or replacement room thermostat. A wire connected to the y3 terminal on your current thermostat indicates that you have a three stage cooling system. Ecobee thermostats do not support three stages of cooling. 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.

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. Heck now i m not calling anyone a dummy. T5 smart thermostat with c wire adapter wi fi color touchscreen thermostat sign up for the latest deals offers. The thermostat uses 1 wire to control each of your hvac system s primary functions such as heating cooling fan etc.

If your current thermostat doesn t have a wire in the c terminal. Wire helps transmit data over a longer distance. S indoor and outdoor wired sensors. Just like the y wire the w wire s control the heating aspect of your system.

Use our tool to determine which thermostats work with your home s existing wiring. The wiring diagram that you ll get from the nest app will tell you to connect the c wire to your nest thermostat. Y compressor stage 1 cooling. 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.

The larger 18 ga. Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat. Thermostat wiring and wire color chart thermostat wiring colors code. See the diagram below for what each wire controls on your system.

Thermostat wiring compatibility unsure if honeywell home thermostats from resideo are compatible with your home. If you see a wire connected to your current thermostat s w3 terminal we recommend booking a pro near you to install your ecobee. If your current thermostat has a wire in the c terminal. Using a pocket knife trim off 1 4 of the colored coating to expose the wire.