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Refrigerants play a crucial role as heat transporters in air conditioning systems. Once the refrigerant stock is too low, its efficiency in absorbing heat will drop sharply. During the operation of the air conditioner, the indoor heat that should have been quickly transferred to the outside cannot be effectively discharged due to insufficient refrigerant, resulting in a significant reduction in the overall cooling effect.
The heat exchange temperature of the coil rises
The refrigerant flows in the coil and takes away the heat through heat exchange. When the refrigerant flow rate decreases, the accumulated heat in the coil is difficult to be removed in time, resulting in an increase in the heat exchange temperature of the coil. This not only reduces the cooling efficiency of the air conditioner, slowing down the indoor cooling speed, but also may lead to an increase in the energy consumption of the air conditioning system, raising the user's usage cost.
The opening degree of the electronic expansion valve increases
The electronic expansion valve is a key component for controlling the flow of refrigerant in air conditioning systems. When the refrigerant is insufficient, the system may misjudge it as a flow issue and automatically increase the opening of the electronic expansion valve in an attempt to increase the flow of the refrigerant.
The outdoor unit pressure is relatively low
When the refrigerant decreases, the efficiency of condensation and evaporation will both drop, resulting in both high and low pressures of the outdoor unit being relatively low.
The compressor is overheated and the temperature at the top remains high
Similar to the principle of compressor overheating mentioned earlier, the small circulation volume of the refrigerant makes it difficult to effectively release the heat generated by the compressor during operation. Especially at the top of the compressor, due to relatively poor heat dissipation conditions, the temperature will be even higher. Being in such a high-temperature state for a long time will have a serious impact on the performance of the compressor, which may cause damage to the compressor and affect the normal use of the air conditioner.
The frosting phenomenon on the liquid supply pipe is prominent
Insufficient refrigerant causes the pressure inside the liquid pipe to drop, which in turn leads to a corresponding decrease in the boiling point of the refrigerant. When the pressure inside the liquid pipe is lower than the saturated vapor pressure at the ambient temperature, the refrigerant will start boiling at the valve, causing a sudden drop in local temperature and the formation of frost.
The temperature of the compressor has abnormally risen
When the refrigerant circulation volume decreases, the compressor cannot be adequately cooled. Under the long-term high-temperature operation of its internal parts, the exhaust temperature will be too high. This not only accelerates the wear of the compressor and shortens its service life, but may also trigger a series of malfunctions, affecting the stable operation of the entire air conditioning system and causing unnecessary trouble and losses to users.
The temperature difference between the intake and exhaust air has been significantly reduced
Insufficient refrigerant will lead to a decrease in the evaporation efficiency of the evaporator. When the air passes through the evaporator, it cannot be cooled sufficiently, resulting in a smaller temperature difference between the air blown out from the air conditioner's outlet and the indoor air. Users will clearly feel that the air blown out by the air conditioner is not cool enough, and the cooling effect is not as good as before, as if the cooling capacity of the air conditioner has been "weakened".
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