Central Heat And Air Thermostat Wiring 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.
Central Heat And Air Thermostat Wiring 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). In this hvac installation training video, i show how to wire the low voltage thermostat wires into a furnace and ac unit. i explain what each of the letter t. 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. 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.
Central Heat And Air Thermostat Wiring 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. 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. The most common configuration of a 4 wire thermostat is: red, r wire: this carries the 24v power supply and is responsible for the functioning of the thermostat and communicating with the hvac system. insert it into the r or rc terminal. white, w wire: this is the heating wire and signals the heating system. Turn off the power for your heating and air conditioning system at the main service panel. its circuit breaker should be clearly labeled. safety tip: make sure you don't install a new thermostat on circuits exceeding manufacturer specified voltage. higher voltage thermostat wiring will damage the controls and may cause shock or become a fire.
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