Quick Answer: What Is The Color Code For Wiring A Thermostat?

Where does the brown wire go?

The brown wire goes to the Live terminal which is connected to the fuse, which is on the right.

The blue wire connects to the neutral terminal on the left of the plug.

You should also ensure that the correct fuse is fitted to the plug before use..

What does R and W mean on thermostat?

R wire – heat power. W wire – heat. R wire – heat power. W wire – heat. G wire – fan.

Can I use a 2 wire thermostat on a 4 wire system?

Likewise, can I use a 2 wire thermostat on a 4 wire system? Yes, you can connect a four wire thermostat to this setup. Connect the white wires in the same manner as the black wires are connected.

What color is the common wire?

WhiteWhite. The “common” is the “neutral” or “ground” wire, depending on the type of circuit. In normal US residential wiring, you’ll have a black “hot” wire, a white “neutral” or “common” wire, and a green or bare “ground” wire.

What color wire goes where on a thermostat?

If you only have a single red wire the jumper between Rh and Rc are required for some heating and cooling hybrid systems depending on your thermostat. Yellow/Y is the AC compressor. Green/G runs the fan. Blue or Black/C should be a ground and will be used by both Rh and Rc, and apparently your thermostat.

What is the brown wire on a thermostat?

A brown wire is mostly likely a heat pump wire and should be connected to the O/B connector on the Nest thermostat. If the B wire is blue, it should most likely be connected to the C connector.

How many wires should my thermostat have?

Your most basic setup on most modern units needs 4 control wires plus the fifth blue “C” wire that provides power to the thermostat. It won’t cover anything elaborate like a heat pump, but your greatest risk would be the installer uses your wire to pull the wire they actually need.

What does R and RC mean on thermostat?

R – 24vac (Heating transformer) Rc – 24vac (Cooling transformer) *Trade model thermostats are required to operate “dual-fuel” systems (systems that use a heat pump for the first 1 or 2 stages of heating and use a gas or oil furnace for backup / emergency heating).

Why is there a jumper between R and RC?

Effectively there isn’t a second RH wire, although there is an RH terminal. 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.

Where does black wire go on thermostat?

The red wire should always come from the hot side of the 24-volt transformer. Additionally, the common (sometimes black) should come from the common side of the transformer. Furthermore, the wire colors on the transformer will be different than the thermostat wires.

Does R go to RC or RH?

An R wire can go into a Nest Learning Thermostat’s Rc or Rh connector. … These are not jumper wires, and you can insert the Rc wire into the Rc connector and the Rh wire into the Rh connector.

What if there is no C wire for thermostat?

If your current thermostat didn’t need a C-wire, it (or a wire that can be used as a C-wire) might be rolled up inside the wall.

What do the letters mean on thermostat wiring?

Y = yellow, g = green, r=red, w = white. Generally the red is your “hot” wire, straight from transformer that supplies constant power to your thermostat, which when each function, ie, cool, or heat is engaged, allows connection between red and whichever wire is called for by the thermostat.

What happens if you wire a thermostat wrong?

Electric shock. Blowing a circuit breaker. Damaging the thermostat unit, the electrical system or even the AC/furnace unit itself. Dual-fuel systems, a poorly located thermostat, whole-home humidifiers, or incorrect wiring can make the installation of a thermostat a longer, more frustrating, and more complicated …

Where do thermostat wires go?

Here’s how to wire a thermostat using the color code and, FYI, each terminal’s purpose. Attach the red wire to the R terminal (Call for heating and/or cooling). Attach the green wire to the G terminal (Fan). Attach the white wire to the W terminal (Heat).