How To Wire A Thermostat Diagram R or rc wire (power) connected to the r power terminal to power the thermostat. w wire (heat), connected to the heating control. g wire (fan) connected to the fan control to operate a blower in your hvac system. y1 wire (cooling) connected to the y terminal compressor refrigerant system. Here’s how to wire a thermostat using the color code and, fyi, each terminal’s purpose. attach the red wire to the r terminal (call for heating and or cooling). attach the green wire to the g terminal (fan). attach the white wire to the w terminal (heat). attach the yellow wire to the y terminal (ac).
Heating And Cooling Thermostat Wiring Diagram Connect the new thermostat. place the plate of your new thermostat against the wall where it will be located. check the plate with a level, and mark the screw holes with your pencil. if applicable, drill guide holes before adding anchors to the wall. pull the wires through the opening of the thermostat’s backplate. The importance of the c wire. when you open your existing thermostat, the first thing you need to do is locate the c wire. the c wire, also known as the common wire, is most often blue and provides constant power to the thermostat. this wire could also be brown, black or purple. older thermostats may not have needed this wire, so a previous. Unscrew the two wires from the terminals. remove the motherboard of the old 2 wire thermostat and put the new 2 wire thermostat in its place. reconnect the red and white wire, tighten down the set screw, and put the control panel back on. test the 2 wire thermostat wiring by turning the furnace on. Disconnect the wires. once you’ve located all the wires, taken a photo, and labeled where everything goes, it’s time to disconnect the wires and the mounting screws. make sure to tape the wires down so they don’t fall inside the wall. remove any anchor screws and the backplate of the existing thermostat.
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