A thermostat is wired to a furnace or air conditioner unit and acts as a switch to turn the unit on and off automatically based on the thermostats temperature setting andor programmed time schedule. Thermostat wire comes in various weights.

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S1 and S2 Wires - connects to S1S2 terminals and is for outdoor temperature sensor.

Ac unit thermostat wiring. One wire usually red supplies 24 volts AC power to the thermostat while the other three supply control signals from the thermostat usually white for heat yellow for cooling and green. I show where the wires go at the thermostat the color code then down at the furnace control board. E-Wire - connects to E terminal and is for Emergency heat.

G Terminal to the Green Wire. As with wiring any home thermostat the air conditioner thermostat has a series of wires which need to be connected in order to ensure that it will work correctly. Yellow The yellow wire connects to your compressor.

The heating system will likely be a gas or electric furnace. Orange This wire connects to your heat pump if you have one. One wire on one side of the contactor and one wire on the other side.

W White wire this is the AC thermostat wire from heating unit. G Terminal is connected to the Green Wire or G Wire - This is for the blower fan in the air handler. R Terminal for the Red Wire.

The white wire connects to your heat. Understanding thermostat wiring colors is the next step. C Terminal to the Blue Wire.

To install your unit youll need to connect the correct wires to the terminals on the back of your new thermostat. A thermostat with five wires typically controls an air conditioner with a heating system. W2 Commonly brown wire This wire is for second stage heating.

The unit could be furnace oil or gas furnace boiler or electric furnace. Here is what a contactor looks like. Tracing the Wire to the Source.

The two wires that come out of the unit and hook to the two wires coming from inside should terminate inside the outdoor unit at the contactor. The thermostat is likely a digital thermostat that requires the C-Wire or the common wire to provide power for the thermostat. The 18 refers to the gauge and the 5 refers to how many individual wires are inside the cable.

Here is the industry standard thermostat wire color code used for most systems. Origin is the control transformer and then the R Terminal. My Paperback and E-Book.

Thermostat wire is just a big spool of bundled color-coded wires. How to Wire an Air Conditioner for Control - 5 Wires. Green The green wire connects to the fan.

W Terminal to the White Wire. The yellow wire connects to your compressor. The W wire goes to W terminal on the subbase of air conditioning thermostats.

The extent of this wiring is usually described in the air conditioner thermostat manual but if you have lost the instructions or cannot follow them completely then wiring in your stat can be a bit of a challenge. If there are any loose wires or wires that are cut or corroded they should be clipped stripped and reattached to the terminal screws. If you have heat and AC youll need 185.

Inspect the Thermostat Wiring Inspect the wiring on the base. Replace the thermostat body plate. 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.

X or Aux-Wire - connects to X terminal and is for auxiliary. Breakdown of Colors and Terminals Thermostat Wiring Diagram for AC Unit. Basic thermostat wiring for furnace and air conditioner.

White The white wire is what connects to the auxiliary heat on your system. Thermostat Wire Color Code Chart. Y Terminal to the Yellow Wire.

Red Wire for Air Conditioner Control Power Hot. Package Unit Ac Thermostat Wiring By wirgrem 27 Feb 2021 The red wire is the power wire coming from the secondary winding of the transformer. Four wires come to the centrally-located thermostat from the main heatingcooling unit usually located in a closet basement or occasionally in the attic.

The GPC GPH series are self contained packaged units so the only connections needed for installation are the supply and return ducts the line and low voltage wiring and drain connection.

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