How can I install a Y wire for a Nest thermostat?

Where does y wire go on Nest?

Quote from the video:
Quote from Youtube video: The Y wire is yellow. And that is the cooling wire or AC wire. So that controls your HVAC. System on the AC.

What is the Y wire on a Nest thermostat?

General Thermostat Wiring Color Code

What does Y control on a thermostat?

R (or) RH wire – power. G wire – fan. W wire – heat. Y wire – cooling compressor.

Is Y cooling on a thermostat?

Y-wire – Cooling, usually yellow. W-wire – Heat, usually white.

What color is the Y wire on a thermostat?

yellow

Thermostat Wiring Tips



If your thermostat controls your heat, you will have a white wire. The Y wire is yellow and connects to your air conditioning compressor. The G wire is green and connects to the fan. Rc and Rh: The red wire(s) are the power source for your thermostat.

What is the difference between Y1 and Y2 on a thermostat?

In conventional cooling systems, Y/Y1 controls the first stage of cooling and Y2 controls the second stage, which helps cool down the home faster. In heat pump systems, Y1 controls your compressor, which heats and cools your home.

What does Y1 and Y2 mean?

In standard systems, Y/Y1 controls the first stage of cooling, and Y2 controls the second stage.

Does Nest need RC and RH?

The Nest Thermostat E only has an R connector, which is typically where an R wire would go. If you have separate heating and air conditioning systems, you might have separate Rh and Rc wires that come out of the wall and are connected to your system.

What happens if you wire a thermostat wrong?

Potential consequences of improper installation could include: Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself.

What does Y stand for HVAC?

Y, Y1, Y2: Whenever your thermostat calls for cooling, the Y wire is used to send a signal to your HVAC system telling it to fire up the air conditioner. Y1 and Y2 wires might be used instead if you have a two-stage system (i.e. a high level for extremely hot or cold days, and a low level for mild days).

Is G wire necessary?

As you mentioned, you don’t usually need a G wire for heating mode, but you do for cooling. In special circumstances a relay could be wired up inside of the air handler to make the fan come on with a call for cooling, but normally it’s the thermostat that makes the connection that makes the fan come in in cooling mode.

What is the difference between RH and RC on Nest thermostat?

There is no standard for the colour of the RH wire, but most units use a red one. The RC wire, on the other hand, refers to “red cooling”. It’s the same with the RH wire in that it powers the thermostat. For the RC, it powers the cooling system.

Do I need a jumper from R to RC?

If you have a wire in the R terminal, and another wire (not a jumper) in the RC terminal, you will not need to connect the R and RC terminals. See our Basic Wiring article for more info here.

Does RH go to R or RC?

If you have two wires, R or RH will go into the R terminal, and RC will go into the RC terminal.

Why is my RH and RC wire connected?

However, the heating still needs to be controlled, so a wire known as a jumper is connected between the RC and the RH terminals so that power gets to the heating control part of the thermostat. This wire is also known as the RH wire.

Why is my Nest not detecting RH wire?

To fix an E74 error or no power to the Rh wire error on your Nest thermostat, check for loose connections and fix them. If that does not work, clean out the drain pipes and check if the condensate pump associated with your HVAC is clogged.

Can I use RC wire as C wire?

No the Rc is the red wire. You need 5 wires or more for this to run with all the functions. You can use one of the other wires but you have to drop control of the fan. It will only come on when furnace comes on.

Why does my Nest say no power to Rh wire?

Quote from the video:
Quote from Youtube video: And it's caused by the float switch on the air handler detecting that the condensation.

Where does the RH wire get its power?

The Rh wire is a type of red wire, which delivers 24-hour electric power from the transformer. In contrast to your cooling system, the Rh wire links to your heating system.