Question: What does R and RC stand for on a thermostat?

RC is no different and simply means red cooling. The wire is generally red, although there is no color standardization -- but more importantly, the R really means that the wire and terminal are hot; its a live electrical wire. The RC wire connects to the RC terminal, which controls the cooling system.

What is R and RC on thermostat?

In a thermostat, the R wire is responsible for powering the entire HVAC system (through a transformer). If you have both an Rh (Red-heat for powering the heating) and an Rc (Red-cool for powering the cooling), then the R wire can be connected to either Rh or Rc.

Do I use R or RC on thermostat?

If you have two wires, R or RH will go into the R terminal, and RC will go into the RC terminal. If you have a C wire, place it into the C terminal on your wall plate. Lets take a look at the G wire. This wire will go to the G terminal on your new thermostat.

What is RC connection on thermostat?

RC: The RC terminal is the 24-volt cooling power supply. Y/O: The Y/O terminal is used to control the cooling condenser. When the thermostat calls for cooling, signals are sent to power up the condenser and the blower fan, cooling your home. W/B: The W/B terminal controls the heat relay or valve.

What is Y on a thermostat?

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. The O wire reverses the valve from heating to cooling, and the B wire switches the valve from cooling to heating.

Do I need a jumper on my thermostat?

If your HVAC system has both heating and cooling functions, youll need to connect both the Rc and Rh terminals with a red wire. Because many thermostats come with a pre-installed thermostat jumper wire that connects these terminals, you only need one red wire, which could be the thermostat Rc wire or the Rh wire.

Why does my thermostat have a jumper?

Most of your current thermostats wires will be connected to your thermostat and go through the wall to connect to your HVAC system. Instead, a short jumper wire connects two thermostat terminals together. This is fairly common on the Rh and Rc terminals.

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