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. 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.
How To Wire A Thermostat Diagram 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). Learn how to wire thermostats for different types of hvac systems, such as air conditioners, heat pumps, and furnaces. see diagrams, wire colors, and terminal connections for each system. 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. 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:.
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