Question: What Are The Color Codes For Thermostat Wiring?

What is W on a thermostat?

W=the heat load.

On a call for heating the thermostat closes a switch between R and W, sending 24v to energize the heating circuit.

Y= the cool load.

On a call for cooling the thermostat closes a switch between R and Y, sending 24v to energize the cooling circuit.

G= the fan load..

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 color code for a thermostat?

Thermostat Wiring Color Code ChartMarkingWire Color CodeDescriptionEBrownEmergency heat relayYYellowPrimary cool call relayY2YellowSecondary cool call relayGGreenFan relay12 more rows

What color is the C wire on a thermostat?

BlueThe Blue or “C” Wire Blue wires are also called “C” wires because they are the Common wire. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type.

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.

Does R go to RC or RH?

Here are some general guidelines: 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.

Is RC the same as C wire?

Though it is a common notion, it may be incorrect to state that the C-wire powers the thermostat. Typically, the wires that give the power supply (usually termed as the ‘hot’ wires) are marked Rc (for cooling) and Rh (for heating). … ‘ If your system has a common wire, it will be marked ‘C’ at most times.

Why does my thermostat only have 2 wires?

If your heating system has only two wires, the job of the thermostat is simple. All it has to do is turn the heat or the cooling on and off. … There is also no thermostat blue wire, or common wire, to power the thermostat, so it has to operate on its own, either using batteries or mechanical temperature detection.

What does raindrop mean on AC?

Even though it is showing water, it actually means the air con is in ‘Dry’ mode, a function that removes unpleasant humidity from the ambient air, while still throwing out cold air. Next we have the fan symbol: or or.

How many wires does a thermostat need?

5 wiresMost systems today require a minimum of 5 wires when both heating and air conditioning equipment is included in the system. Our pro recommendation is to use 18/8 wire.

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 …

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.

Why does my thermostat only have 3 wires?

If you have a heat-only system, you may notice that your thermostat has three wires—R, G, and W. … 1) Run an additional wire to use as a C from the furnace control board to the thermostat. 2) Re-purpose your G wire as your C wire, connecting it to the C terminal at both your furnace control board and your ecobee.

Can you put a thermostat in wrong?

If you installed the thermostat backwards, it would probably not open up enough to allow coolant to flow, and the temp gauge would shoot up into the far right range, the engine would overheat, etc. … Therefore, the deep end (Arrow C) of the thermostat always gets installed going towards, or into, the engine.

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.

What are the 5 thermostat wires?

Here is the industry standard thermostat wire color code used for most systems:White. The white wire connects to your heat.Yellow. The yellow wire connects to your compressor.Green. The green wire connects to the fan.Orange. This wire connects to your heat pump (if applicable).Red (C). … Red (H). … Blue.

Is r the same as Rh?

R , Rh , and Rc are all the same, but not. In general terms, the R terminal is where you connect the signal voltage source. … One of the legs from the secondary of the transformer will be connected to the R terminal, which applies a voltage to the terminal.