Heating And Cooling Thermostat Wiring 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).
Thermostat Wiring Schematic For Heat And Air In addition to heating (2 wire thermostats) and c or fan (3 wire thermostats), 4 wire thermostats include the cooling wire, usually in blue or yellow color. here are the wires in 4 wire thermostats with terminal codes and color codes (also referred to as 4 wire thermostat wiring color code): red wire for power (24v). 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. Key wires: red (r) for power, white (w) for heating, and yellow (y) for cooling. process: connect the red wire to the r terminal, the white wire to the w terminal, and the yellow wire to the y terminal. if there’s a green wire for the fan, connect it to the g terminal. programmable thermostats:. The y wire is yellow and connects to your air conditioning compressor. the g wire is green and connects to the fan. rc and rh: the red wire(s) are the power source for your thermostat. if your thermostat is dedicated to air conditioning only, it will have a red rc wire. for heating and cooling systems, it will have a red rc and a red rh wire.
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