The R-cable is the power cable for your heating and cooling system. If you only have an R wire (no Rh or Rc) you can connect your R wire. Rc or Rh on the Nest Thermostat.
Does the R wire go to RH or RC?
If you have two wires, R or RH goes into the R connector and RC goes into the RC connector.
Is the RC cable the same as the C cable?
The R wire (red) is really the power source. Wire C completes the circuit and allows a continuous flow of 24V to power the thermostat. … Terminals C and Rc supply power to the thermostat.
Should I use RC or RH?
There is no standard for the right wire color, but most devices use a red one. The RC wire, on the other hand, refers to “red cooling”. The same goes for the right wire as it supplies power to the thermostat. On the RC it drives the cooling system.
Where is the R connection of a thermostat connected?
Basic Wiring In the simplest form of control, the C or common terminal of the low voltage transformer is wired in parallel with all control relays. The R terminal of the low voltage transformer is connected to each control relay through the thermostat.
What do R and W mean on the thermostat?
Wire W—Heat. Wire R – thermal power. Wire W—Heat. Wire G – fan.
What is RC or RH in a thermostat?
RC: The RC connector is the 24 volt cooling supply. RH: The right terminal is the 24 volt heater supply. … Y/O: The Y/O terminal is used to control the cooling condenser. When the thermostat calls for cooling, signals are sent to turn on the condenser and fan, cooling your home.
How do I know if I have a C-wire?
It’s easy to tell if you already have a C-cable connected to your system. Simply remove the faceplate of your current thermostat from the base plate and locate the connector marked with the letter “c”. If this connector is connected to a wire, you have an active “C” wire.
Can I use G wire for C wire?
Option #3: Use G-wire as C-wire If there is no hidden C-wire, you can use G-wire instead. However, you cannot use your fan independently if the heating or air conditioning is not working. Also, many HVAC systems are incompatible with this solution, including: HVAC systems that use electrical heat.