Simple Thermostat Wiring Guide 2 3 4 5 6 7 8 Wires Color Code 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. 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.
Thermostat Wire Colors Explained Wiring Diagram 6 wire thermostat wiring color code. you’ll have a 6 wire thermostat if your system has two stages of heat and one stage of air conditioning. two stage heating systems have a low setting and a high setting. apart from the red, green, white, yellow, and black or blue common wire, a 6 wire thermostat will also have a brown wire that connects to. Yellow wires. the yellow wires on your thermostat connect to your compressor. they control your air conditioning system by turning the compressor on and off. the yellow wires connect your thermostat to your compressor contactor via the air handler. the yellow wires connect to the y terminals on your thermostat. 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). 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.
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