Wiring Thermostat To Furnace And Ac

R the r terminal is the power.

Wiring thermostat to furnace and ac.

Color of wire and termination. Always refer to your thermostat or equipment installation guides to verify proper wiring. 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. It terminates at your air handler or furnace.

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. 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 yellow wires underneath your thermostat connect to your compressor. Thermostat wiring and wire color chart thermostat wiring colors code.

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. This allows a automatic control of the furnace to turn the fan on when the heat exchanger is warm enough. The white wire connects to terminal w in industry standard thermostats. They control your air conditioning system.

Moreover the heat source for a basic ac system can include heat strips for electric heat or even a hot water coil inside the. 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. 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. Note some ac systems will have a blue wire with a pink stripe in place of the yellow or y wire.

When the red wire is disconnected from w the. 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. Turn off your existing thermostat flip the furnace ac breaker to the off position. Label where the wires are connected on the thermostat check to see if they match the industry standard listed above.

For example if the red wire is connected to w on the thermostat the furnace should turn on. Thermostat wiring diagrams for heat pumps heat pump thermostat wire diagrams.