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An AC system is a refrigeration system just like your refrigerator, it operates by changing the physical state of a refrigerant via evaporation to remove heat and condensing to reject the heat removed out doors.

Upon a call for cooling from the thermostat, a 24 volt signal is sent to the AC unit outside where it energizes a electromagnetic relay called a contactor, it pulls the normally open switch closed just as an electromagnet picks up scrap metal in a scrap yard, The electrical current creates a powerful magnetic field that sucks the normally open switch closed, this sends 230 volts to the compressor which begins to run.

A cool ,low pressure vapor is pulled into the compressor from the evaporator coil, it will be approximately 70 psi and 40F degrees, if using R 22 refrigerant.

As it may be 100F or more outdoors, the compressor must bump up the cool low pressure vapor up to a hot high pressure vapor, it will pump it up to about 30F degrees above the outdoor ambient temperature, this is so that regardless of how hot it may get out side, the refrigerant is hotter, thus able to reject heat to the relatively cooler out door air, thus condensing the vapor refrigerant into a liquid refrigerant that is still hot but a high pressure liquid.

The hot high pressure liquid is sub cooled to about 15F degrees below the condensing temperature

That will be about 125 F @ 270 psi, again if using R 22 refrigerant.

The hot high pressure liquid refrigerant is then sent to the metering device, this is what delineates the hot high pressure side from the cold low pressure side.

Imagine you have a mouth full of water and a straw in your mouth, if you blew hard the water will spray out the end of the straw and upon exiting the straw the liquid refrigerant "boils" changes state liquid to vapor just as boiling a pot of water boils or changes state if raised above 220F at sea level 14.7 psi atmospheric pressure.

The clod low pressure vapor exits the evaporator coil and is sucked into the compressor for the next trip around and around evaporating and condensing the refrigerant to remove heat and to then reject heat.

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