Ac Thermostat Control Wiring

The common wire sometimes referred to as the c wire is what s responsible for delivering constant power to your thermostat.

Ac thermostat control wiring.

The yellow wires connect to the y terminals on your thermostat. 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. They control your air conditioning system. Origin is the control transformer and then the r terminal.

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. 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. It terminates at the air handler or furnace. 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 yellow wires terminate at your compressor contactor via an air handler.