R , Rh , and Rc are all the same, but not. In general terms, the R terminal is where you connect the signal voltage source. In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry. One of the legs from the secondary of the transformer will be connected to the R terminal, which applies a voltage to the terminal.
When the thermostat wants to be warmed up or cooled down, it closes the appropriate switch, completing a circuit. This allows current to flow from "into" the R terminal and "out of" the appropriate signal terminal W , Y , etc. In some systems, both the heating and cooling systems use their own signal voltage. In these cases, the signal wire from the heating system will be connected to R or Rh , while the signal wire from the cooling system will be connected to Rc.
This answer has some diagrams that show how a simple single signal system works. This answer provides another diagram of how a single signal thermostat works, though you can easily imagine how it could be modified to allow multiple signals. Click for larger view. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? This terminal will light up if your heating or cooling system has a problem. And then you have the X wire. The X wire stands for auxiliary heat which was already mentioned a while ago. Just like the E wire, auxiliary heat pumps are there to give additional heating whenever the system cannot keep up with the cold surroundings outside.
And there you have it! Save my name, email, and website in this browser for the next time I comment. July 17, Why Are Thermostat Wirings Important? What are RH and RC? G The G wire is probably the safest wire in the unit. C The C wire is not always present in every unit. E Wire E is found in heat pumps, and they are usually activated when the surroundings are too cold.
L The L terminal is more of a port than an actual wire. X And then you have the X wire. Lisa Hayden. Bose Acoustimass 10 vs Lifestyle vs Sonos Playbar. You may also like. R , Rh , and Rc are all the same, but not. In general terms, the R terminal is where you connect the signal voltage source. In low voltage controlled systems, there will be a step down transformer that provides the power to the control circuitry.
The following thermostats work without a c-wire…. Venstar Add-a-Wire Adapter. C stands for common. The common wire is the ground or negative wire. To complete the circuit that provides power to the thermostat you need a positive and negative wire from the 24V transformer. Some thermostats have batteries that power them and they serve only as a switch to operate the heating or cooling unit.
A single pole thermostat operates off one circuit, and therefore cannot operate separately.
0コメント