R the r terminal is the power. It is better to take a good up close photo of the old thermostat and what terminals the colored wiring are terminated.
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Ac wiring diagram colors. Black red and blue are used for 208 vac three phase. Thermostat wiring and wire color chart thermostat wiring colors code. I explain what each of the letter terminals are for the voltage path how it works and also the normal color code used. Conductors larger than 6 awg are only available in black and are color taped at the ends. The colors adopted as local practice are shown in table below. I discuss how to wire the contactor and what the difference is between 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. Phase 3 phase 3 wiring should be yellow. Phase 2 phase 2 wiring should be orange. Basic thermostat wiring colors air conditioner systems always remember when changing a thermostat for a new thermostat to take a photo of the colors and where they go on the old thermostat or get a pencil and paper and write it down. Neutral neutral wires should be grey. Ground ground wiring should be green or green with a yellow stripe.
Color of wire and termination. Phase 1 phase 1 wiring should be brown. In case of wiring dc power like solar or computer networks the following standard has to be followed. Iec dc power wiring color code. These are the wire color coding standards that are used in the united states. Us ac power circuit wiring color codes.
All the above mentioned color code for electrical wiring is to transmit ac current from the mains. Dc power installations can be divided into earthed or unearthed systems. Brown orange and yellow are used for 480 vac.
Gallery of Ac Wiring Diagram Colors
