How to Read an Automotive Air Conditioning Refrigerant Gauge?
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Automotive air conditioning refrigerant gauges display pressure readings, which indicate the compressor's discharge pressure (high pressure) and suction pressure (low pressure). These readings help determine whether the system is functioning properly, such as identifying issues like blockages or refrigerant leaks. The gauge typically shows MPa (megapascals) and bar, which are commonly used pressure units in China. 0.1MPa = 1bar = 1 kg/cm². Taking the commonly used R22 refrigerant as an example, under normal operating conditions of the refrigeration system, the low pressure generally ranges between 3-6 bar, and the high pressure between 10-25 bar, depending on the ambient temperature. Precautions for Adding Refrigerant: When adding refrigerant to the air conditioning system, it is crucial to ensure that the piping system has expelled any excess air, moisture, or blockages. After prolonged use, the air conditioning system requires periodic replenishment of Freon. Typically, this task is entrusted to professionals, as they know where to source Freon and the correct method of adding it to the system. If your home air conditioning system has been installed for about five to six years, it is necessary to check the Freon levels. When adding Freon, it is important to add the correct amount. More Freon is not necessarily better; the right amount is crucial. Excessive Freon can impair the system's performance, leading to poor cooling or even a complete lack of cooling.
