4 Wire Thermostat Wiring Color Code

By | August 14, 2022



Having the proper wiring for a 4 wire thermostat is essential for efficient and safe operation of your home’s HVAC system. While there may be some variations in the color of wiring used, the primary color code for setting up the wires for a 4 wire thermostat remains the same. Knowing the 4 wire thermostat wiring color code is important so that you can make sure you have connected your wires correctly.

The most common type of 4 wire thermostat wiring setup uses red, white, green, and yellow wires. The red wire is typically used for power and connects to the Rc terminal, with the other end connected to the power supply. The white wire is responsible for connecting to the heat source and is connected to the W terminal on the thermostat. The green wire controls the fan and is connected to the G terminal. Finally, the yellow wire is used to control the cooling source and is connected to Y terminal on the thermostat.

Most 4 wire systems use an 18-gauge, solid-core wire but it is always best to check with the manufacturer’s specifications for any specific requirements related to your system. When installing a new thermostat, it is important to take extra caution and turn off power to the system, label the wires, and then recheck the labels before connecting them to the new thermostat. Following these simple precautions will ensure your safety and get your home’s HVAC system up and running again in no time.


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