Wiring Thermostat To Furnace And Ac

The w terminal often the white wire will be the thermostats output for a heating call to the furnace sending the 24 volt power back to the furnace to its w terminal.

Wiring thermostat to furnace and ac.

How to wire an air conditioner for control 5 wires the diagram below includes the typical control wiring for a conventional central air conditioning system furthermore it includes a thermostat a condenser and an air handler with a heat source. For example if the red wire is connected to w on the thermostat the furnace should turn on. The white wire underneath your thermostat connects to your heating system. Heat pumps are different than air conditioners because a heat pump uses the process of refrigeration to heat and cool while an air conditioner uses the process of refrigeration to only cool the central air conditioner will usually be paired with a gas furnace an electric furnace or some other method of heating.

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. Air conditioning ac contactor control board 1 this diagram is to be used as reference for the low voltage control wiring of your heating and ac system. Once your c wire is ready follow these steps to install your new thermostat. Thermostat wiring diagrams for heat pumps heat pump thermostat wire diagrams.

Turn off your existing thermostat flip the furnace ac breaker to the off position. The yellow wires underneath your thermostat connect to your compressor. It is a red wire and comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit. The white wire connects to terminal w in industry standard thermostats.

Note some ac systems will have a blue wire with a pink stripe in place of the yellow or y wire. Thermostat wiring and wire color chart thermostat wiring colors code. Color of wire and termination. Furnace thermostat wiring diagram terminal letters on a thermostat and what they control the hot wire 24 volts usually red from the transformer is the main power wire to turn on or off a furnace components.

They control your air conditioning system. This allows a automatic control of the furnace to turn the fan on when the heat exchanger is warm enough. It terminates at your air handler or furnace. 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.

Label where the wires are connected on the thermostat check to see if they match the industry standard listed above. Always refer to your thermostat or equipment installation guides to verify proper wiring.