The three pressures of the air conditioning system are: balance pressure, high pressure, low pressure; These three pressures are important parameters for air conditioning maintenance. The three pressures are the corresponding pressures of the refrigerant R22 circulating in the air conditioning pipeline at different positions. Because R22 is circulated between the gas and liquid, accompanied by heat absorption and heat release, the temperature of the external environment has a significant impact on it. Under normal circumstances, the ambient temperature is high, and the pressure value becomes large. The ambient temperature is low, and the pressure value becomes smaller.

Balance pressure refers to the pressure when the compressor is not working, high and low pressure balance; High pressure refers to the exhaust pressure or condensing pressure; Low pressure refers to suction pressure or evaporation pressure. The three pressures are measured on the process port of the outdoor unit air valve, the low pressure for cooling operation, the high pressure for heating operation, and the balance pressure for non-working.

Refrigeration evaporation refers to boiling, so the evaporation temperature is the boiling point, condensation refers to the process of R22 under a certain pressure in the saturated state of gas to liquid, so the condensation temperature is also the boiling point. R22 corresponds to different boiling points under different pressures, as shown in the table, the one-to-one correspondence between evaporation pressure and evaporation temperature of R22.

Refrigeration refrigeration design of air conditioning working conditions are: outdoor ring temperature 35℃, indoor temperature 27 degrees, evaporation temperature +5℃, evaporation pressure 0.48MPa. Therefore, the low pressure of air conditioning standard refrigeration is 0.48MPa.

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