Basic Thermostat Wiring Diagram

In the most basic system this functionality is provided by use of a fan center relay and the low voltage wiring to the thermostat now will require a minimum of three wires for heat only units and four wires for heat cool fan for control. Rc red wire power 24 vac rh or 4 red wire jumpered power 24 vac w white wire for heating enable y yellow wire for cooling enable. Basic thermostat wiring colors air conditioner systems always remember when changing a thermostat for a new thermostat to take a photo of the colors and where they go on the old thermostat or get a pencil and paper and write it down.

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Basic thermostat wiring diagram. Thermostat wiring diagrams for heat pumps heat pump thermostat wire diagrams. I show where the wires go at the thermostat the color code then down at the furnace control board and how to wire up the wires coming. It is better to take a good up close photo of the old thermostat and what terminals the colored wiring are terminated. Many technicians have great difficulty understanding how to properly wire a thermostat or how to replace a thermostat with a different thermostat.

This additional terminal is labeled g in the thermostat. Thermostatic wiring principles by bob scaringe ph d p e. Basic thermostat types. The basic heat a c system thermostat typically utilizes only 5 terminals.

Basic thermostat wiring for furnace and air conditioner. Heck now i m not calling anyone a dummy. Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat. Heat pumps are different than air conditioners because a heat pump uses the process of refrigeration to heat and cool while an air conditioner uses the process of refrigeration to only cool the central air conditioner will usually be paired with a gas furnace an electric furnace or some other method of heating.

The diagram below shows how a basic 4 wire thermostat is connected as indicated by the color code chart above. In fact the wiring of a thermostat is quite simple circuitry the confusion arises principally because. The main trouble is dealing with those different colored wires knowing which one does what and if that wasn t enough.