What is the difference between the two refrigerant pipe […]
What is the difference between the two refrigerant pipes for air conditioners?
The purpose of connecting the outdoor unit and the indoor unit is to connect the indoor unit and the outdoor unit. The refrigerant (freon, also called refrigerant) passes through the connecting pipe. For example, in the cooling mode (that is, in summer), the R134 refrigerant tube unit absorbs indoor heat (exhaust air-conditioning). After the refrigerant becomes a low-pressure and medium-temperature refrigerant, it exits to the outdoor unit through a larger copper tube. You can touch the larger copper pipe with your hand, it feels colder and there will be water on the surface.
The refrigerant passes out of the air-conditioning copper pipe and is compressed by the compressor and then becomes high-temperature and high-pressure refrigerant and enters the outdoor unit heat exchanger to release heat (fan rotation). Then the refrigerant changes to medium temperature and medium pressure and enters the room through another copper pipe (the smaller one). Before entering the indoor unit, it passes through a throttle valve (such as a capillary copper pipe or an expansion valve). It is small, but after passing the throttle valve, the volume suddenly becomes larger, so the refrigerant instantly becomes a low-temperature and low-pressure refrigerant, so it absorbs heat. This completes a refrigeration cycle. If it is a heating cycle, the opposite is true.