Smart Hvac Thermostat Wiring Color Code

A cooling system with two compressors or a two stage compressor need a y2 terminal so the thermostat is able to control the second stage of cooling.

Hvac thermostat wiring color code. Additionally thermostat wiring colors are not standardized. The diagram below shows how a basic 4 wire thermostat is connected as indicated by the color code chart above. Industry standard for geothermal heat pumps.

It s 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. Industry standard for geothermal heat pumps. The basic heat a c system thermostat typically utilizes only 5 terminals.

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. This thermostat wire color code will help homeowners understand the anatomy of their thermostat. This could happen if the wires are swapped on both ends or if there s a spice in the wire somewhere that was not matched up to the correct color.

A majority of the time the hvac wiring color is brown for this particular terminal. We give a summary tables of both traditional and current thermostat wire color code keys above the 5 universal base colors for thermostat wires which are in order of frequency of use red white green yellow and black. Furthermore the thermostat wire colors below are the most likely colors used for most installations.

My paperback and e book. However your thermostat wire colors may be different than what the indication is here. There is no official standard for thermostat wire colors.

Blue or c wires. The most essential colors are red green and yellow although you may find up to eight different wires in a heat pump thermostat or as few as five in a more common hot water system. The color of the wire varies from installer to installer but it appears light blue is usually the go to color for this terminal.