Thermostat Wiring Explained 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 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. 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. White wire: heating. blue wire: cooling. rh: heating power. rc: cooling power. to reconnect the wire, simply put the wire on the right terminal and tighten down the set screw. pull a wire a bit to make sure the wire is properly fixed. example: reconnect the red wire to r, tighten the screw, check, and move to the new wire. 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.
Thermostat Wiring Change Cooling And Heating White wire: heating. blue wire: cooling. rh: heating power. rc: cooling power. to reconnect the wire, simply put the wire on the right terminal and tighten down the set screw. pull a wire a bit to make sure the wire is properly fixed. example: reconnect the red wire to r, tighten the screw, check, and move to the new wire. 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. 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. Rc – red: this wire provides 24 volt power from the furnace to the thermostat so that the thermostat can control air conditioning. r – red: this wire serves the same purpose as the rc wire but for heating. y – yellow: cooling mode. this wire runs to the furnace control board which in turn controls the activation of the compressor and.
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