![]() ![]() ♣The thermostat wire colors for these terminals will vary depending on the installer of the HVAC system and if they used conventionally accepted colors for that terminal. RC is for the air conditioner and RH is for the heating system. If you have a dual transformer system then you need to use terminals RC and RH. A 24 Volt transformer for the air conditioner and one for the boiler or furnace. ♦Some HVAC systems will have two transformers set up. See our other thermostat installation advice articles. Basic Thermostat Wiring Colors - Air Conditioner Systems See the important notes below for further instructions – Thermostat Wiring Colorsīasic Thermostat Wiring Colors – AC Systems Control Diagram Thermostat Terminal ![]() Nearly everyone has a camera on their cell phone. It is better to take a good up-close photo of the old thermostat and what terminals the colored wiring are terminated. 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. ![]()
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