Hvac Thermostat Wiring Color Code 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. Mostly for new digital thermostats that require continuous power via c wire. typical 6 wire thermostats will use red (r or rc or rh), white (w, w1), yellow (y, y1), green (g), black or blue c wire, and orange (o b) wire for reversing valve switch; used for complex heat pumps. thermostat wire color meanings are standardized.
Simple Thermostat Wiring Guide 2 3 4 5 6 7 8 Wires Color Code Orange wire (o): reversing valve control. the orange wire (o) is essential for heat pump systems. when your thermostat calls for cooling, the orange wire activates the reversing valve, allowing your heat pump to switch into cooling mode. in heating mode, this wire reverses the refrigerant flow, enabling your heat pump to provide warmth. 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). The blue wire is the common wire that links to a power source and is critical for running the thermostat. typically, the blue wire connects to the heat pump and can also be black. white. w. the white wire connects to the primary heating unit and ends at the air handler or furnace. 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 101 How To Wire A Thermostat For Your Home The blue wire is the common wire that links to a power source and is critical for running the thermostat. typically, the blue wire connects to the heat pump and can also be black. white. w. the white wire connects to the primary heating unit and ends at the air handler or furnace. 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. Y, y1, y2: whenever your thermostat calls for cooling, the y wire is used to send a signal to your hvac system telling it to fire up the air conditioner. y1 and y2 wires might be used instead if you have a two stage system (i.e. a high level for extremely hot or cold days, and a low level for mild days). w, w1, w2: just like the y wire, the w. Reconnect the wires to the correct terminals—white to “w” or “w1”, red to “r”, yellow or sky blue to y, and green to “g”—and tighten the screws until you’re sure they’re fixed in place. turn the heat pump or the hvac device on and check if it’s working properly. if it is, you’re done with the hvac thermostat wiring.
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