Thermostat hook up furnace

thermostat hook up furnace

How do you wire a thermostat for a gas furnace?

White wire to the thermostat terminal strip for the gas furnace. A green wire to the G on the thermostat terminal board for manual blower fan operation. Finally, an optional blue wire hooked to the common terminal or C terminal on the thermostat terminal board. Detailed thermostat wiring color codes can be found here.

What is thermostat wiring and how does it work?

Thermostats are the ultimate control hubs for HVAC devices such as furnaces and air conditioners. Thermostat wiring is a useful skill to know if you have to replace an old thermostat or just check if something is wrong with the new thermostat. With a little help, you can learn how to install a thermostat on your own.

What kind of wiring do you need for a thermostat?

4 Wire Thermostat Wiring (Heat Pumps, HVAC) 4 wire thermostats have a bit more flexibility. Smart thermostats like Nest and Ecobee thermostats require 4 wire thermostat wiring to function properly.

How to disconnect a thermostat wire?

Take the piece of paper and pen or pencil and write down where each thermostat wire is landed on the terminal board. Finally, take the labels and label each wire for the terminal where the thermostat wire was landed, and note the color to the terminal for the wires you will soon disconnect.

How do you hook up a thermostat to a furnace?

Install the white wire on the thermostat and the furnace terminals that say W. Connect the red wire to the thermostat and the furnace at the terminals that are marked R. Youll need to run the wires between the thermostat and the furnace, inside the walls of your home.

How do you wire a red wire to a thermostat?

Strip the red and white wires back about 1/4 inch at both the thermostat and the furnace ends. Connect the white wire to the W terminal on the furnace and thermostat. Repeat this for the red wire, connecting it to the R terminal on both the furnace and thermostat.

What kind of wiring do you need for a thermostat?

4 Wire Thermostat Wiring (Heat Pumps, HVAC) 4 wire thermostats have a bit more flexibility. Smart thermostats like Nest and Ecobee thermostats require 4 wire thermostat wiring to function properly.

Where does the W wire go on a gas thermostat?

You will find them in gas furnace thermostats, for example, but won’t find them in air conditioner thermostats. W wires go directly to the source of heating; that may be a furnace (gas, electric, oil, you name it) or heat pumps ( mini-split heat pumps included ).

Can I just disconnect my old thermostat?

The old thermostat cant simply be disconnected as this would leave the heating wiring open circuit and it would not operate, the integrity of the circuit needs to be maintained. As not all thermostats are the same, or indeed wired the same, the specific instructions given to one poster may not apply to another.

How to remove a wall-mounted thermostat?

The thermostat holds the wires out of the wall; the wires are suspended on the thermostat. If you remove the thermostat right away, the wires will be lost inside the wall. You will have to either: Fish the wires out of the wall. Smash the wall to be able to reach the wires. To prevent these two scenarios, make sure to spread the wires.

How do you change a 2 wire thermostat to 2 wire?

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.

What are the different types of thermostat wirings?

We will cover the most common thermostat wirings for 2 wire, 3 wire, 4 wire, and 5 wire thermostats. At every stage, we will point out what 2 wire or 5 wire thermostats are used to wire, for example, to get a bigger picture of where those color wires go and how they enable the functions of air conditioners and furnaces.

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