How to Read the Gauge on an Air Conditioning Refrigerant Pressure Meter?

[DiRylee]

Depending on the ambient temperature, the low pressure of a refrigeration system during normal operation generally ranges between 3 to 6 bar, while the high pressure ranges between 10 to 25 bar. Below is relevant information about air conditioning refrigerant pressure meters: 1. Why does an air conditioner need Freon?: Freon is the medium that transfers heat in an air conditioning refrigeration system. Without it, heat cannot be effectively exchanged, and the air conditioner cannot cool or heat. Therefore, if the air conditioner lacks Freon, external symptoms may include poor cooling (or heating), no cooling (or heating), protective shutdown, water leakage from the indoor unit (sometimes spraying water), and ice formation on the indoor evaporator. There are also unseen issues—reduced lifespan of the air conditioner, wasted electricity, and damage to the air conditioner's compressor. Thus, to use an air conditioner normally, there must be sufficient Freon. 2. How much Freon should be added to an air conditioner?: During hot summer weather (when the ambient temperature is above 32°C), the pressure gauge needle should stabilize at 0.45 MPa. In spring and autumn, it should be 0.3 MPa. In winter, Freon addition is not entirely based on the pressure gauge reading (the reference pressure is 1.8 MPa), but rather relies on the technician's experience or observing the amplitude of the pressure gauge needle's swing.