Thermostat Wiring For Furnace And Ac

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The two 24 volt wires go to the r terminal and c terminal inside the thermostat.

Thermostat wiring for furnace and ac.

The thermostat is likely a digital thermostat that requires the c wire or the common wire to provide power for the thermostat. It terminates at your air handler or furnace. Once your c wire is ready follow these steps to install your new thermostat. Check to see if they match the industry standard listed above.

A thermostat with five wires typically controls an air conditioner with a heating system. Flip the furnace ac breaker to the off position. Red wire for air conditioner control power hot 1 the r terminal is the 24 volt hot feed from the control step down transformer. C terminal to the blue wire.

G terminal to the green wire. That will power the relay contactor or complete the circuit in the circuit board. Sometimes depending on the thermostat and the manufacturer the thermostat can be a dual heat pump thermostat. The yellow wires terminate at your compressor contactor via an air handler.

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. Thermostats use 24 volts ac from a transformer to control a furnace. The white wire connects to terminal w in industry standard thermostats.

Breakdown of colors and terminals thermostat wiring diagram for ac unit. Always refer to your thermostat or equipment installation guides to verify proper wiring. Turn off your existing thermostat. They control your air conditioning system.

Additionally it will require a different thermostat and different wiring than an air conditioner. Furnace 24 volt transformer. W terminal to the white wire. Y terminal to the yellow wire.

The yellow wires underneath your thermostat connect to your compressor. 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. Notesome ac systems will have a blue wire with a pink stripe in place of the yellow or y wire. The yellow wires connect to the y terminals on your thermostat.

The transformer steps down 120 volts to the 24 volts the thermostat needs and sends out the 24 volts on two wires. This diagram is to be used as reference for the low voltage control wiring of your heating and ac system. R terminal for the red wire.

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