[How To] Read and Download Programmable Thermostat Wiring Diagram

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Programmable Thermostat Wiring Diagram. Back in the olden days thermostats were simple onoff devices that didnt need their own continuous power supply. Unlike many older thermostats though the RTH9580WF does require the C common wire.

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Back in the olden days thermostats were simple onoff devices that didnt need their own continuous power supply. The diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. If your system does not have a fan than this terminal will not be used.

Room Thermostat Wiring Diagram Wiring A Thermostat With 3 Wires pertaining to 3 Wire Room Thermostat Wiring Diagram image size 800 X 600 px image source.

The diagram below shows how a basic 4-wire thermostat is connected as indicated by the color code chart above. The blue wire on the thermostat is the Common or C wire. All of the dashed wires shown in the wiring diagrams are either optional or their usage depends upon your specific system type or brand. See the diagram below for what each wire controls on your system.