Why does my thermostat have 5 wires?

5 wire thermostat is basically a 4 wire thermostat with a “C” or “Common” wire. The newer digital thermostats for HVAC devices all require a 24V C wire connection to function. 5 wire thermostats are the most versatile thermostat; they control anything from smart air conditioners, heat pumps, furnaces, and so on.

How do I connect Honeywell thermostat to 5 wires?





Quote from the video:
Quote from Youtube video: Hey let's go hook it. Up. No but Honeywell's come with battery yes yeah over balls come with batteries. You can put them in for backup. In case the power goes out it won't lose his programming.

How do you hook up a 5 wire?

Quote from the video:
Quote from Youtube video: Start off by taking a picture of the wiring already in place on your old thermostats wall plate for future reference. Next unscrew each wire from its terminal. Pull out the wires.

What is the blue wire on a 5 wire thermostat?

The blue wire, or C-wire, is known as the common wire. It’s there to provide power to the thermostat. Older thermostats usually don’t have a C-wire because they either don’t need power or, if they do, they get it from a battery.

Do I need to connect the blue wire on my thermostat?

The Blue or C Wire





Blue wires are also called C wires because they are the Common wire. C wires are necessary for any smart thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.