5 Wire Thermostat Color Code

This is commonly found in standard hvac systems that use an air conditioner and a furnace.

5 wire thermostat color code. 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. Common honeywell thermostat wiring color code. Its important to note that in some cases the color of the wire does not necessarily mean it connects to that came color one the board. R the r terminal is the power.

Color codes for 24v thermostat wires are divided into two groups. In electric heating furnaces this lead turns on the heating elements. Ac service tech llc 15788 views. The diagram below shows how a basic 4 wire thermostat is connected as indicated by the color code chart above.

Red wire rh power. Color code how it works diagram. Red for the common hot side of the heating transformer. Interpreting thermostat wire colors.

I am installing a honeywell eim and it is not powering on. Failure to properly link these can lead to failures in the system including short circuits which can lead to fires. Therefore taking the time to learn all of the possible combinations of wires and colors is essential to keeping the family safe. Opens the valve turns on the ignitor and fires up the burners in the furnace.

Thermostat wiring and wire color chart thermostat wiring colors code. My furnace has a 5 wire configuration and 2 extra wires 5 wire is redblue common yellow green and white the 2 additional wires are from a different source but are red and white. White wire w heating wire. Thermostat wiring to a furnace and ac unit.

And in heat pump systems the white wire starts the compressor in heating mode. 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. W heat white wire. In gas systems this triggers the lighting process.

Yellow wire y cooling wire. The picture above depeicts the typical wiring color code for a 4 wire thermostat. These colors are used as follows. The thermostat wire is color coded so the technician can identity which wire goes to which port on each board.

Upgrading from a 4 wire thermostat to a 5 wire thermostat duration. The above is a typical wiring diagram of a nest thermostat with 4 wires. These color codes are vitally important in connecting the right wires to the corresponding terminals. The 5 universal base colors for thermostat wires which are in order of frequency of use red white green yellow and black.