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The c wire is an extra wire that can be used to provide a return path for continuous 24V power for any application. It’s normally used to provide a return path to power the thermostat. The “c” stands for common. It is often labeled as “c” on thermostat backplates.Click to see full answer. Simply so, what color is the C wire for a thermostat?Here are common uses for wire colors: Blue or Black – C – Common wire, may be unused by your existing thermostat. Enables continuous power flow from the Red wire. Red – R – 24VAC power from the furnace’s transformer.One may also ask, do all WiFi thermostats require C wire? A C-wire or common wire is a power supply that is required for your smart thermostat to work properly. Unfortunately, most of the older thermostat models didn’t require one and that is the reason why many homes do not have a C-wire installed. Almost all WiFi thermostat models require a common wire. Also Know, what is C wire for Honeywell thermostat? A common wire (C-Wire) provides Wi-Fi thermostats continuous power by connecting it to a heating and cooling system (e.g. furnace). C-Wires are required on most Honeywell Wi-Fi thermostats, with the exception of the Smart Round Thermostat (formerly known as the Lyric Round).Is RC the same as C wire?Though it is a common notion, it may be incorrect to state that the C-wire powers the thermostat. Typically, the wires that give the power supply (usually termed as the ‘hot’ wires) are marked Rc (for cooling) and Rh (for heating). They give a 24-volt power supply from the HVAC system’s control panel.

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