Furnace thermostat wiring diagram terminal letters on a thermostat and what they control the hot wire 24 volts usually red from the transformer is the main power wire to turn on or off a furnace components. With the top thermostat wiring diagram showing an air conditioning system.
980e86c Evcon Air Conditioner Wiring Diagrams Wiring Library
Hvac wiring diagram thermostat. R the r terminal is the power. 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 g green wire controls fan on auto the diagram shows how the wiring works. White the white wire is what connects to the auxiliary heat on your system. 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. Red now there can be two separate wires for this. Orange this wire connects to your heat pump if you have one.
Moreover the heat source for a basic ac system can include heat strips for electric heat or even a hot water coil inside the. Yellow the yellow wire connects to your compressor. The common wire sometimes referred to as the c wire is whats responsible for delivering constant power to your thermostat. The basic heat ac system thermostat typically utilizes only 5 terminals. 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. As shown in the diagram you will need to power up the thermostat and the 24v ac power is connected to the r and c terminals.
C is known as the common terminal. Thermostat wiring and wire color chart thermostat wiring colors code. How to wire an air conditioner for control 5 wires the diagram below includes the typical control wiring for a conventional central air conditioning systemfurthermore it includes a thermostat a condenser and an air handler with a heat source. My paperback and e book. Green the green wire connects to the fan. The color of wire r is usually red and c is black.
The thermostat is the control device that provides a simple user interface with the internal workings of your homes climate control system. Color of wire and termination. For example if the red wire is connected to w on the thermostat the furnace should turn on. These two connections will ensure that there is power to the thermostat that you are operating. The second wiring diagram showing a heat pump system. Heat pump thermostat wiring a typical wire color and terminal diagram.
Finally the third thermostat diagram showing the average type of split system with an air conditioner or gas or oil furnace used for heating. For programmable thermostats and smart thermostats c wires are essential for setting a schedule or having your heat or air conditioner turn on at a desired temperaturewhile some units can run without a c wire even brands like nest recommend having one for optimal.
Gallery of Hvac Wiring Diagram Thermostat
