Question: Why Is There A Jumper Between RH And RC?

Is RC same as C wire?

Your Rh and W terminals control your heat.

The C and Rc terminals are what powers the thermostat.

Rh stands for Red-Heat and Rc stands for Red-Cool.

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..

What is jumper wire used for?

A jump wire (also known as jumper wire, or jumper) is an electrical wire, or group of them in a cable, with a connector or pin at each end (or sometimes without them – simply “tinned”), which is normally used to interconnect the components of a breadboard or other prototype or test circuit, internally or with other …

What is red wire on thermostat?

Red or “Rc” Wires Red wires, specifically Rc wires, are responsible for 24-hour volt AC power from your transformer. … Dual transformer systems refer to a setup with a cooling and heating transformer. These wires only connect to your cooling system. Rc wires connect to the RC terminals on your thermostat.

What does W mean on a thermostat?

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

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.

What does RH and RC mean on a thermostat?

RC: The RC terminal is the 24-volt cooling power supply. RH: The RH terminal is the 24-volt heating power supply. (Note: The RC and RH terminals are jumpered together in a four-wire heat/cool system and a single-stage heat pump system, but not in a five-wire heating/cooling system.)

Should RC and RH be connected?

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 four wires in a thermostat?

4 Wire Thermostat Wiring Color CodeRed Wire = Rh = Power.White Wire = W = Heating Wire.Yellow Wire = Y = Cooling Wire.Green Wire = G = Fan Wire.Blue Wire = Y = Cooling.

Do I need a jumper from R to RC?

If you just have one wire, regardless if it’s labeled RC, it will go into the R terminal, and the jumper connecting terminals R and RC will be in place. Some thermostats have a jumper switch, some have a metal staple, others may have a plug, and the jumper may also just be a wire connecting the two terminals.

Where does RC wire go on nest?

Use the wiring diagram you got from the compatibility checker in step 4 to connect your system wires to the Nest Thermostat. Note: If you have an R, Rc or Rh wire, you can put it into the R connector on the Nest Thermostat. If you have a W2, Y2 or O/B wire, you can put it into the *O/B connector, if needed.

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. In this scenario, the Power Extender Kit (PEK) is not compatible. 1) Run an additional wire to use as a C from the furnace control board to the thermostat. …

How do I know if I have C wire?

It is easy to see if you already have a c-wire connected to your system. Simply remove your current thermostat face from its baseplate and look for the terminal labeled with the letter “c.” If this terminal has a wire attached to it, you have an active “c-wire.”

Whats the difference between RC and RH?

The RH wire refers to “red heating” which means that this is the connection you need in order to power the heating system of your air conditioning unit. … 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.

What color is RC wire on thermostat?

RedThermostat Wiring Color Code ChartMarkingWire Color CodeDescriptionRcRedPower from cooling, 24 Vac transformerRhRedPower from heat, 24 Vac transformerCBlack/BlueCommon of 24 Vac transformerWWhitePrimary heat cell relay12 more rows

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.