How to Install a Honeywell Thermostat with 4 Wires

Having a functioning thermostat is essential for proper climate control in your home. To ensure precise temperature regulation, and a comfortable indoor environment, it's important to invest in a quality product. Honeywell makes some of the best thermostats on the market, and now you can get one that works with four wires. Installing a Honeywell thermostat with four wires is something you can do yourself with a little bit of technical savvy - and this article will show you how.

What You Need to Know Before You Install

Before you take the plunge and install your new thermostat, there are a few things you should know. First, check to see if you have the right type of power supply. Honeywell thermostats require either a 24-volt AC or a battery powered source. If you don’t have the right kind of power, you may need to consult an electrician. Secondly, make sure you have the right type of wire. Most Honeywell thermostats are compatible with 18 AWG (American Wire Gauge) but if you need more power, you can use 14 AWG. Finally, you should have all the necessary tools and materials to hand, including wire cutters, wire strippers, and an electrical screwdriver.

Step-By-Step Guide To Installing A Honeywell Thermostat With 4 Wires

Once you have made sure you have the right power source, wire type and tools, you’re ready to begin. Follow these steps to properly install your new Honeywell thermostat:

Turn off power to the heating or cooling system at the circuit breaker.

Remove existing thermostat wall plate, including existing wiring.

Disconnect existing wires from the existing wall plate.

Identify and label each wire, noting where they were connected.

Connect the wires to the system side of the new thermostat according to the labels you created.

Securely connect the appropriate wires to the back of the thermostat.

Carefully re-mount the new thermostat wall plate.

Securely install the new thermostat base onto the wall plate.

Turn on the circuit breaker.

Power up the thermostat following the manufacturer’s instructions.

How to Wire a Honeywell Thermostat With 4 Wires

Wiring a Honeywell thermostat with 4 wires is fairly straightforward and easy to do. The most important thing to remember is to label each wire with its corresponding letter on the old thermostat wall plate. This will make it easier to identify when you reconnect them. Here is a quick guide to wiring a Honeywell thermostat with 4 wires:

System	Terminal	Wire Color/Name
Common/Ground	C	Green/White
Heating	W	Red/Orange
Cooling	Y	Blue/Violet
24 VAC	Rc	Brown/Gray

Make sure to securely attach each wire to the terminals, and to follow all the manufacturer’s instructions. Once you have finished wiring the thermostat, turn the power back on and you’re good to go.

Conclusion

Installing a Honeywell thermostat with 4 wires is a relatively simple job and is well within the capabilities of the average homeowner. As long as you have the right power source and wire type, and you carefully follow the steps outlined above, your new thermostat should be up and running in no time. Make sure to keep the manufacturer’s instructions close at hand and take all safety precautions.

Honeywell Rth9580wf Thermostat Wiring Question Diy Home Improvement Forum