Below are the factors that affect mini split working pressure: Naturally, the working pressure varies based on the operating condition. Factors that Affect Mini Split Working Pressure While approaching the dew point temperature, the dehumidification capability of the mini split drops, potentially causing high humidity problems.įurthermore, as the surface temperature of the cooling coil is around 14☌, the supply air temperature will also be around 14☌ which is considered high and possibly causing insufficient cooling. Hence, the surface temperature of the cooling coil will also be about 14☌ which is very close to the dew point of air at dry bulb 25☌ and RH 55% which is 16☌. On the other hand, the temperature of the R410A refrigerant is at 14☌ when the low side pressure is at 160 psi. When the cooling coil is frozen, its heat exchange capability drops and thus, further decreases the low side pressure and eventually causes the mini split to trip due to low pressure. Hence, the surface temperature of the cooling coil will also be near the freezing point thereby causing the air passing through the cooling coil to freeze up.

However, the low side pressure of R410A mini splits should never fall below 100 psi or raise beyond 160 psi.Īt 100 psi, the temperature of the R410A refrigerant is at 0☌ or freezing point of water. it is the pressure of the refrigerant after the compressor. On the other hand, the high side pressure is the pressure of the refrigerant running inside the discharge line. It is the pressure of the refrigerant before the compressor. The low side pressure is the pressure of the refrigerant running inside the suction line. Most of the time, we don’t measure the high side pressure. So, they should be operating in between 110-140 psi of pressure on the low side. Most mini splits today are using the R410A refrigerant. What Should R410A Mini Split Pressure Be?

Hence, it is important that we understand the fundamentals behind the working pressure of a mini split. The working pressure of mini splits is depending on factors such as the weather and cooling load. However, it should not fall below 100 psi or raise beyond 160 psi. The low side pressure of a typical R410A mini split is between 110-140 psi depending on the operating conditions. Some people charge the refrigerant of their mini splits by themselves and thus, they are wondering what should R410A mini split pressure be? Mini splits require the refrigerant or freon to operate and they operate at a certain range of pressure.

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