Ac Thermostat Control Wiring

Air conditioner thermostat wiring details and color code r terminal is connected to the red wire or r wire this is 24 volt power for the thermostat and controlled devices.

Ac thermostat control wiring. G terminal is connected to the green wire or g wire this is for the blower fan in the air handler. For programmable thermostats and smart thermostats c wires are essential for setting a schedule or having your heat or air conditioner turn on at a desired temperature. The common wire sometimes referred to as the c wire is what s responsible for delivering constant power to your thermostat. Origin is the control transformer and then the r terminal.

Typically the yellow wire will be run to the air handler where at the air handler this wire is usually connected to another wire typically by a wire nut. It terminates at the air handler or furnace. The green wire underneath your thermostat connects to the fan of your furnace or air handler. They control your air conditioning system.

The yellow wires terminate at your compressor contactor via an air handler.