Thermostat Wiring For Furnace And Ac

Once your c wire is ready follow these steps to install your new thermostat.

Thermostat wiring for furnace and ac.

Sometimes depending on the thermostat and the manufacturer the thermostat can be a dual heat pump thermostat. The transformer steps down 120 volts to the 24 volts the thermostat needs and sends out the 24 volts on two wires. G terminal to the green wire. Always refer to your thermostat or equipment installation guides to verify proper wiring.

R terminal for the red wire. Additionally it will require a different thermostat and different wiring than an air conditioner. The thermostat is likely a digital thermostat that requires the c wire or the common wire to provide power for the thermostat. The white wire connects to terminal w in industry standard thermostats.

Turn off your existing thermostat. Flip the furnace ac breaker to the off position. The yellow wires terminate at your compressor contactor via an air handler. C terminal to the blue wire.

Red wire for air conditioner control power hot 1 the r terminal is the 24 volt hot feed from the control step down transformer. In the most basic system this functionality is provided by use of a fan center relay and the low voltage wiring to the thermostat now will require a minimum of three wires for heat only. A thermostat with five wires typically controls an air conditioner with a heating system. The two 24 volt wires go to the r terminal and c terminal inside the thermostat.

They control your air conditioning system. Notesome ac systems will have a blue wire with a pink stripe in place of the yellow or y wire. Furnace 24 volt transformer. Check to see if they match the industry standard listed above.

This diagram is to be used as reference for the low voltage control wiring of your heating and ac system. Label where the wires are connected on the thermostat. This function allows you to circulate the air in the house by using the fan in the furnace without heating or cooling the air moving through the system. The heating system will likely be a gas or electric furnace.

Or it can be used for an air conditioner and gas furnace system depending on how the thermostat is wired. That will power the relay contactor or complete the circuit in the circuit board. It terminates at your air handler or furnace. The yellow wires underneath your thermostat connect to your compressor.

Thermostats use 24 volts ac from a transformer to control a furnace. The white wire underneath your thermostat connects to your heating system. Breakdown of colors and terminals thermostat wiring diagram for ac unit.