When I look at the y terminal in the Furnace board, there is no wire in the y terminal. The problem is that now, 6 months later I try to turn the a/c and it does not turn on. Then the nest was replaced and there was some rewiring and the nest has been working. ![]() At some point I had turned off the pilot valve which I was told may have something to do with the nest loosing power. ![]() Typically inside the air handler.Īdditional resource links for wiring a thermostat:ģ) Heat Pump Thermostat Wiring Chart & DiagramĤ) Select the Proper Thermostat for Your HVAC SystemĪ nest thermostat was installed in June and by December it lost power. Terminal Strip where wire terminations are made during installation. Honeywell Thermostats Available Here Terminal Strips - Wiring Thermostat for AC C Terminal and C-Wire for the 24-Volt Common side of the TransformerĥFinally, the C terminal is the common terminal, and this terminal feeds the common side of the load from the control transformer. Finally, that is where the coil in the compressor contactor needs a hot and a common from the control transformer to work. That is needed at the compressor contactor. Furthermore, the other control wire will be the common wire. However, it could be connected via a terminal strip in the air handler).Īdditionally, it then runs outside to the condensing unit along with at least one other wire in an air conditioner split system set up. Typically, the yellow wire will be run to the air handler where at the air handler, this wire is usually connected to another wire (typically by a wire nut. Furthermore, it will be one of the few control wires ( thermostat wires) that will terminate at the condenser in a split system air conditioner and heating system. It typically is terminated at the compressor contactor in the condensing unit located outside. Y Terminal for Yellow Wire - Air Conditioning Thermostat WiringĤThe Y terminal is the terminal that will turn on the air conditioner. Moreover, it is the fan that circulates air throughout the ductwork system. G Wire for Fan Control | How to Wire an Air Conditioning ThermostatģThe G terminal is for the blower fan located in the air handler. Additionally, the backup heat for heat pumps. White Wire for Heating System (If so equipped)ĢThe W terminal is for heating, including the heating for gas furnaces, electric furnaces, boiler systems. Finally, it will feed it with 24 volts, provide power to the thermostat, and when the thermostat calls for heating or cooling, provide everything with control power. That will power the relay, contactor, or complete the circuit in the circuit board. Red Wire for Air Conditioner Control Power (Hot) | How to Wire an Air Conditioner for ControlġThe R terminal is the 24-volt hot feed from the control step-down transformer. How to Wire an Air Conditioner for Control - 5 Wires Breakdown of Colors and Terminals | Thermostat Wiring Diagram for AC Unit (opens in a new window) Thermostat Wiring Diagram | How to Wire an Air Conditioner for Control 5 Wires Related Link: Standard 18 gauge thermostat wire is used for all control wiring. Finally, typical systems that do not use 24-volt control are window unit air conditioners, ductless mini-split systems, and baseboard electric heating systems. ![]() Circuit boards or printed circuit boards found in modern systems utilize 24-volt control, which originates from the control transformer. All the relays in the system have 24-volt coils. Moreover, the heat source for a basic ac system can include heat strips for electric heat or even a hot water coil inside the air handler that gets hot water from a water heater or boiler.Įvery conventional residential ac system uses 24 volts for the control of the system. Furthermore, it includes a thermostat, a condenser, and an air handler with a heat source. The question is: 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. How to Wire an Air Conditioner for Control 5 Wires
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