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Thermostat wire color code guide.
Hvac wiring color code. Industry standard for geothermal heat pumps. The thermostat wire is color coded so the technician can identity which wire goes to which port on each board. Always turn the power off.
Color codes for 24v thermostat wires are divided into two groups. Thermostat wiring colors code easy hvac wire color details. The mandatory colors for power wiring in national electric codes nec are green bare or green yellow yellow strip or band on green for protective ground pg and white alternatively grey for neutral wire.
These colors are used as follows. Industry standard for geothermal heat pumps. Blue or c wires.
Thermostat wiring and wire color chart thermostat wiring colors code. Lastly if you have a package unit then the. 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.
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. A majority of the time the hvac wiring color is brown for this particular terminal. During installation the wires are connected to one board that sends certain data through each wire to the thermostat.
R the r terminal is the power. The color of the wire varies from installer to installer but it appears light blue is usually the go to color for this terminal. Function label color iec color old iec.
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