How do you change a 4 wire thermostat to a 5 wire?

4:239:47Upgrading from a 4 Wire Thermostat to a 5 Wire - YouTubeYouTubeStart of suggested clipEnd of suggested clipI would have to attach it to the C terminal. If there was not a fifth wire I would have had toMoreI would have to attach it to the C terminal. If there was not a fifth wire I would have had to attach the wire here to the HVAC. And then run it down to the thermostat.

Why does my thermostat only have 4 wires?

The concept is that when you adjust your thermostat its like flipping a switch, and you are providing power to the your HVAC system to work, its just that in a typical 4 wire thermostat the thermostat decides where to route the power to turn on your HVAC system to make it heat, cool or run the fan.

What is the difference between a 4 wire thermostat and a 5 wire thermostat?

These older thermostats require 4 wires, but newer more sophisticated thermostats require a 5th wire known as the Common wire to power the digital display. This will allow the fan to turn on when the thermostat is calling for cooling or heating but it will not give you independent fan control from the thermostat.

Why does my thermostat have 5 wires?

What are the 5 wire thermostats? A thermostat with five wires typically controls an air conditioner with a heating system. The heating system will likely be a gas or electric furnace. The thermostat is likely a digital thermostat that requires the C-Wire or the common wire to provide power for the thermostat.

What is the difference between 2 wire and 4 wire thermostats?

If you see two wires coming out of it in the back you have a single pole. If there are four wires, you have a double pole. If you have more than four wires coming out of your thermostat, you most likely have a low voltage one, which would be used to control a central furnace, boiler, or something similar.

Can I use a 4 wire thermostat on a 2 wire system?

Yes, you can connect a four wire thermostat to this setup.

Can you use a 4 wire thermostat to 2 wire?

Yes, you can connect a four wire thermostat to this setup. Connect the white wires in the same manner as the black wires are connected.

Can I replace a 4 wire thermostat to 2 wire?

Replacing an outdated four-wire thermostat with a newer model that uses two wires is not complicated, once you purchase the thermostat from a home-and-garden shop or hardware store. Yes, you can connect a four wire thermostat to this setup. Connect the white wires in the same manner as the black wires are connected.

What happens if you wire a double pole thermostat wrong?

With a double pole (4-wire) thermostat, youll have either 4 wires or 4 terminal screws. If its terminal screws, two of them will be marked L1 and L2 or Line 1 and Line 2. These normally go to the incoming 240 volt power. If you get it wrong, youll trip the breaker and/or destroy the thermostat.