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. 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.
Thermostat Wiring Explained 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). 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. W (white) – heating. connects to the w terminal on the thermostat and controls the 1st stage heating heating system. y (yellow) – cooling. connects to the y terminal on the thermostat and controls the cooling system. g (green) – fan. connects to the g terminal on the thermostat and controls the hvac fan. c (blue) – common. If you have a c wire, place it into the c terminal on your wall plate. c wire adapters are available here. let’s look at the g wire. this wire goes to the g terminal on your new thermostat. of the y, y1, and y2 wires, y or y1 go to the y terminal and y2 to the y2 terminal. the o b wire can have many configurations.
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