Ac Thermostat Control Wiring

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.

Ac thermostat control wiring.

Furthermore it will be one of the few control wires thermostat wires that will terminate at the condenser in a split system air conditioner and heating system. The green wire underneath your thermostat connects to the fan of your furnace or air handler. 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. 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. G terminal is connected to the green wire or g wire this is for the blower fan in the air handler. They control your air conditioning system. If your home s system of this vintage has provisions for air conditioning cooling then the thermostat wiring will have at least three wires some will require a separate r terminal for heating and cooling and will be labeled rh and rc now needing a minimum of 4 wires r w and a y terminal.

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