This relay will communicate with the compressors contactors on the line voltage side of the wiring diagram as required to start and stop the compressor.Īlso included are some safety devices to protect the compressor from high and low pressure conditions. First we’ll add a compressor relay on the low voltage side of the wiring diagram. Now we need to add some way to control these three motors, which we’ll do from the low voltage side and the use of the thermostat. Wiring Diagram showing Electrical Relay Coil on low Voltage side Controlling contacts on the line voltage side. This provides us with the three largest energy consuming devices in our air conditioner, the compressor, condenser fan and indoor fan motors. To complete our refrigerant circuit we need to add an outdoor condenser fan motor on the line voltage side of the diagram. Next we add the refrigerant compressor to the line voltage side and include contacts and a run capacitor. We’ll need to add an indoor fan motor connection to the line voltage side of the diagram and provide contacts for turning on and off the fan. Next we add a thermostat to control the air conditioner, and we connect the power from the low voltage side of the transformer to the “R” terminal of the thermostat. Then we’ll need a transformer to provide 24 volt low voltage power for our thermostat, switches and relays. First we have the main electrical supply lines L1 and L2 providing 208/230 volt, single phase power. We’ll make a ladder diagram using a simple air conditioner as our example. We’ll jump right into showing you a schematic diagram for a simple air conditioning unit. There is a pictorial diagram that gives a much more cluttered look at the electrical components and wiring as its intended to give you the proximity of the component within the unit. The installation diagram will show those connection points most important for connecting the electrical power to the HVAC equipment, while the internal wiring diagrams are meant for troubleshooting by technicians. Schematic Wiring Diagram often called a Ladder Diagram and a Pictorial Diagram There are differences between the type of diagrams based on what they’re used for.
Wiring diagrams are used for the installation of the HVAC equipment, trouble shooting, or locating an electrical device in the control panel or within the unit.
#Central air conditioning system diagram how to#
If you prefer to watch the Video version of this presentation you can scroll to the bottom or click on this link “ How to Read HVAC Electrical Wiring Diagrams”. We’ll explain how to read a schematic wiring diagram and what the various symbols represent and how they function. There are various types of wiring diagrams used in the HVACR Industry. How to Read Wiring Diagrams in HVAC Systems.
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