Thermostat Data Wire

This article explains just what wire at a room thermostat actually controls.

Thermostat data wire.

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. R the r terminal is the power. Just like the y wire the w wire s control the heating aspect of your system.

Thermostat wire reference chart. The larger 18 ga. The wiring diagram that you ll get from the nest app will tell you to connect the c wire to your nest thermostat. These wires are responsible for switching the changeover valve in a heat pump system.

Wire helps transmit data over a longer distance. If you see a wire connected to your current thermostat s w3 terminal we recommend booking a pro near you to install your ecobee. Thermostat wiring for dummies. 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 common wire sometimes referred to as the c wire is what s responsible for delivering constant power to your thermostat. If your current thermostat doesn t have a wire in the c terminal. If your current thermostat has a wire in the c terminal. Knowing what each thermostat wire does can help in wiring up a new or replacement room thermostat.

S indoor and outdoor wired sensors. See the diagram below for what each wire controls on your system. Using a pocket knife trim off 1 4 of the colored coating to expose the wire. Thermostat wiring compatibility unsure if honeywell home thermostats from resideo are compatible with your home.

Thermostat wiring and wire color chart thermostat wiring colors code. 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 o wire reverses the valve from heating to cooling and the b wire switches the valve from cooling to heating. A wire connected to the y3 terminal on your current thermostat indicates that you have a three stage cooling system.

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. Color of wire and termination. Use our tool to determine which thermostats work with your home s existing wiring. 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. Ecobee thermostats do not support three stages of cooling. A thermostat wire uses low voltage signals to transfer data. Over a long distance the signals can become to weak to get a reading.