Ac thermostat hook up, how to hook up a home thermostat

Check with the furnace manufacturer, burlington nc dating and all local codes before attempting this procedure. Then jumper G to Y at the furnace. The W wire goes to W terminal on the subbase of air conditioning thermostats. Make sure to verify the voltage and amperage requirements with your thermostat specs.

Thermostat Wiring for Dummies

You will simply follow the instructions for wiring including color codes the wire color code for thermostat control and then the setup instructions. This way if your color codes don't match the normal code as the chart below indicates, you can still get a good idea of which wire should go where on your new thermostat. Both thermostats are wired into the hydronic valve.

How to Hook Up a Home Thermostat

  • Honeywell has done a great job making installation and operations manuals available for their equipment, but you've got to search with the right product number.
  • Probably best to call a professional because with seeing it myself I do not know how to help you.
  • Do not use B wire if you already have O wire.
  • Sometimes old copper wire becomes brittle and can break.
How to Wire an Air Conditioner for Control - 5 Wires AC Wiring

Some thermostat wires that coming from the air conditioner unit with four wires and there is no common wire. You could twist thermostat wire to pencil to prevent it from slipping to a drywall. The O terminal is used when the system that you are using has a reversing valve or four way valve which is turned on when running cooling mode. The color of the wire vary. Your information was helpful.

Functionally and for wiring they are similar. Many digital thermostats available today are very forgiving in thermostat selection. No sense in pulling out perfectly good wires. Heat Pump and regular air conditioner unit has two differences Ac thermostat.

  1. These types systems are more involved because of the components associated with the system.
  2. Identify and label the wires that are connected as.
  3. Newer thermostats that offer clocks, backlit displays, WiFi, etc.
  4. If it were a package air conditioner units, it came from outside.
  5. The information peoples lack in wire a home thermostat is the thermostat color coded.

If it hooks to the compressor and it burned up you could have other problems also that caused the part to burn up. Should i let it run longer? If you have no spare wires then see below. If the reversing valve is turned on when running heat mode, you will need to connect the reversing valve to B terminal.

So you have to read the electrical diagram This wire is common wire or ground wire. Having three awesome instructors with three different ways of doing things. The W, Y and G terminals should be pretty straight forward on most all types of thermostat's.

Source Because of this, there was no reason to run a return wire to the thermostat. You should note that using one of these things prevents manual control of the fan. Always keep in mind that who ever wired your thermostat may not have followed these procedures and your color codes will not match the following examples. Saves some money too, and avoided disconnecting the old one. Many times, the Y will go straight to the condensing unit many times via the furnace or air handler where it is coupled with the C or common for a complete circuit for condenser control.


Because of this, there was no reason to run a return wire to the thermostat. But with multiple zone heat, you should expect to provide a thermostat for each individual zone - else they're not heating zones at all. By using this form you agree with the storage and handling of your data by this website. Assuming your thermostat and furnace are compatible and you're just short on conductors between them, you could use one of these add-a-wire devices.


Your fan control Select whether your thermostat default or heating system controls the fan. Mercury switches were commonly used in bimetal thermostats. Welcome to the future Newer thermostats that offer clocks, backlit displays, WiFi, etc.

Heat Pump Thermostat

Locating transformers

Remember that ultimately a thermostat is simply an on-off switch, or provides several on-off functions. Now that you know even less about transformers than you did before, lets look at a diagram. Use an Add-a-Wire Device Assuming your thermostat and furnace are compatible and you're just short on conductors between them, dating post you could use one of these add-a-wire devices.

How Home Thermostats Work

Some thermostat may have a feature called Emergency Heat where when set, it will shut off the heat pump. Now the following image here represents a heat pump system thermostat. If you choose to completely rearrange them to suit your purpose, that's fine. Here are the air conditioners frequently asked questions and answers.

The power for your thermostat typically originates from the air handler from a step-down transformer. Condenser is an important component in a refrigeration system where the vapor refrigerant is converted to liquid. Therefore, it is important the check the manufacturer's specifications of the heat pump system that you are using before you can do a proper connection to the thermostat.

White wire coming to the thermostat from the heater, connect to the W terminal in the thermostat. You connect yellow wire to Y terminal on the thermostat subbase. Hi, I have a setup that I think is probably common, at least in the northeast, but that I found very difficult to get straight. In most cases if can be as simple as attaching a new one where the old one goes up the wall from the basement if it's open.

Custom Filters release announcement. If you musts have the wifi thermostat, put it in the basement, and add a remote sensor to the mix. This only turns Off the power to the furnace and air conditioning thermostats.

Ye olde thermostat

Wiring Set-Up Explained
How to Wire an Air Conditioner for Control - 5 Wires

There are no standards for wire color, so any wire could be used for any purpose. In most cases, the reversing valve is energized when running cool mode. Then you'll have to wire the C wire from the cooling system, to the C terminal of the thermostat. Once that is verified, the owners manual should be informative enough to complete the change over very easy. You could also see if your stat allows for a power stealing resistor to be installed unlikely normally only on hydronic radiant heating stats.

This type thermostat is relatively easy to connect or change over to a programmable type thermostat. These new circuits require a path for electricity to return to the source, and so require an extra wire. Check the thermostat manual or air conditioner diagram for color coded. How to Wire Air Conditioning Thermostats How to wire a thermostat To wire air conditioning thermostats, you need to know what types of thermostat your air conditioner needs.

This is for the Heat Pump reversing valve to energize the unit in heating mode. This terminal will call for the need to cool the room when the set temperature is lower than the room temperature. Circuit boards or printed circuit boards found in modern systems utilize volt control which originates from the control transformer. EarlCook jumping the neutral with the hot is just going to result in a short. Green wire is the wire that comes from relay and it controls the fan.

These are the typical physical characteristics of a transformer. You'd need an unused wire, or one that you don't mind always being on e. Furthermore, you can lower energy bills and energy cost by installing a smart thermostat or a programmable thermostat.

Guide to Thermostat Wiring Color Code making install simple and fast

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