What are the 4 wires on my thermostat?
What are the 4 wires on my thermostat?
4 Wire Thermostat Wiring (Heat Pumps, HVAC) Here are the wires in 4 wire thermostats with terminal codes and color codes: Red wire for power (24V). White wire for heating (connected to W or W1 terminal). Green wire for fans.
Is there a problem with a 4 wire thermostat?
4 Wire or 5 Wire Thermostat Wiring Problem – Question: We have a 19-year-old condo with an old Carrier mercury thermostat. We have both a natural gas furnace and an AC unit. There are only four wires going into the existing thermostat – red, green, blue, white.
Where does the C wire go on a thermostat?
If you have a C wire, place it into the C terminal on your wall plate. Let’s take a look at the G wire. This wire will go to the G terminal on your new thermostat. For the Y, Y1, and Y2 wires, Y or Y1 will go to the Y terminal, and Y2 will go to the Y2 terminal. The O/B wire can have many configurations.
Where does the 5th wire on a thermostat go?
On the HVAC, there is a 5th wire, which is white and connects to the C terminal. This wire, along with a red wire, go from the HVAC to the outside unit. My question is can I hook up one of the extra wires to the C terminal on the HVAC where the white wire is and then hook the other end to the C terminal on the thermostat?
Do you need an extra wire for the thermostat?
Yes, you need an extra wire in the bundle going to the thermostat. Just take the extra wire (if you have one) and attached it to the C terminal in the air handler and the other end of that same wire will go to the C terminal on the new thermostat. Question – I have five wires at the furnace. However, at the thermostat, I have only four.
How do I wire up my new thermostat?
Answer: Please always take a picture or mark the wires with tape or labels as to which terminal they were connected to on the old thermostat before thermostat removal. I would be able to help you easily if I had a picture to see where the wires were hooked up to the old thermostat.
Where does the green wire go on a thermostat?
When you’re looking at your thermostat wire colors, you’ll notice a green wire connected from the fan. This wire is responsible for triggering the blower fan. The common wire links to the C terminal. This particular wire extends from the transformer and is responsible for completing the 24 V power circuit in the thermostat.
How many wires do you need for a new thermostat?
Sometimes the new thermostat will have different markings, or it may not even use all the wires that were connected to the old thermostat. Some new thermostats require no more than two wires and will work fine if the extra wires are left unattached.
Can a white wire be connected to a C thermostat?
Hi Murlee! You are correct if the white wire was connected to your C (com) terminal on your old thermostat then, yes you would connect the same white wire to C on your new thermostat. Most of the time the white wire is connected to W1, but some thermostat installers change the wire colors around to fit their own needs.