Thermostat wiring and wire color chart thermostat wiring colors code.
Heating thermostat wiring.
The wiring for your honeywell thermostat depends on the functions of your heating and cooling system.
The common wire sometimes referred to as the c wire is what s responsible for delivering constant power to your thermostat.
Red now there can be two separate wires for this.
Thermostat wiring diagrams for heat pumps heat pump thermostat wire diagrams.
The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system.
The orange wire connects to terminal o on your thermostat.
One is for cool and the other is for heat hence the abbreviation rh and rc.
Heat pumps are different than air conditioners because a heat pump uses the process of refrigeration to heat and cool while an air conditioner uses the process of refrigeration to only cool the central air conditioner will usually be paired with a gas furnace an electric furnace or some other method of heating.
It s there so you can supply power to the heating and cooling switches with a single wire which is usually red.
Only air source heat pumps connect to your outdoor condenser.
If you have empty ports or connections don t worry.
Replacing your old unprogrammable model with a new programmable or wi fi thermostat can make a big difference during the changing seasons.
Your thermostat is most likely fine.
Yellow the yellow wire connects to your compressor.
It terminates in your outdoor condenser for reversing valve operation from hot to cold.
The orange thermostat wire links to your heat pump if you have one.
There are few home improvement projects that offer yearly savings like a new thermostat installation.
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.
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.
The orange wire only applies to homeowners with an air source heat pump.
Some thermostats are as simple as a two wire system.
By the use of an adjustable set point the job of the thermostat is to turn on either the heating or cooling system to maintain the desired room temperature in the home and to turn off the system when the desired temperature is achieved.
If you re at all in doubt contact a heating and cooling company.
Your new thermostat should have the same corresponding code on the back unless otherwise noted in the instructions.
Green the green wire connects to the fan.
R the r terminal is the power.
Color of wire and termination.
You ll probably see a thermostat jumper wire connecting the rc and rh terminals.
