Thermostat Wiring Diagram
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Even the most seasoned people who enjoy diy may come across problems with wiring a thermostat.
Thermostat wiring diagram. The thermostat uses 1 wire to control each of your hvac system s primary functions such as heating cooling fan etc. It is a red wire and comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit. The diagram below shows how a basic 4 wire thermostat is connected as indicated by the color code chart above. By the use of an adjustable set point the job of the thermostat is to turn on either the heating or cooling system to maintain the desired room temperature in the home and to turn off the system when the desired temperature is achieved.
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 basic heat a c system thermostat typically utilizes only 5 terminals. R the r terminal is the power. The main trouble is dealing with those different colored wires knowing which one does what and if that wasn t enough you also have numbers and letters to deal with.
Color of wire and termination. Heck now i m not calling anyone a dummy. In the diagrams below the dotted lines indicate optional wires that may not be applicable to your specific hvac system. The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system.
If you have one r wire connect it to rh at the idevices thermostat and leave the blue jumper in place to rc. 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. Thermostat wiring and wire color chart thermostat wiring colors code. If you have two r wires connect rc to rc and r rh to rh and remove the jumper.
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