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Multi-unit high-pressure protection causes and troubleshooting process

DATE:2024-08-01 10:49:59
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Multi-unit high-pressure protection is a safety measure in central air conditioning systems that is mainly used in air conditioning systems that use a refrigerant cycle for heat exchange, such as in multi-unit systems. High pressure protection is designed to prevent the refrigerant pressure in the system from exceeding a safe range, thus avoiding equipment damage or potential safety risks.
In a multi-unit system, the refrigerant is compressed from a low-pressure state to a high-pressure state under the action of the compressor, then passes through the condenser to dissipate the heat, then through the expansion valve or electronic expansion valve to reduce the pressure, and finally absorbs heat in the evaporator to complete the cooling or heating cycle. If the pressure of the refrigerant rises abnormally during this process, it may lead to the following problems:
Damage to the compressor: high pressure will lead to an increase in the load of the compressor, and prolonged operation under high pressure will accelerate the wear and tear of the compressor, or even lead to its burnout.
Decrease in refrigeration efficiency: High pressure will make the refrigerant condensation in the condenser worse, thus affecting the cooling or heating efficiency of the whole system.
Safety Risk: Excessive pressure may lead to rupture of refrigerant pipes or parts, and the released refrigerant may not only cause environmental pollution, but may also be hazardous to human health.
Common causes of high pressure protection in multi-unit:
Poor air exchange in the outdoor unit: when there is poor air circulation around the outdoor unit, the condenser is unable to effectively transfer the heat from the refrigerant to the ambient air. This usually occurs when the outdoor unit is surrounded by objects or installed in a poor location, such as near a wall or in a confined space.
Dirty condenser blockage: When impurities such as dust, leaves, insect carcasses, etc. accumulate on the condenser's fins, they can impede air flow and reduce heat exchange efficiency. This can lead to a decrease in the condenser's ability to dissipate heat, which in turn causes the condensing pressure of the refrigerant to rise.
Failure of the external fan: If the fan of the external unit is not working or is working inefficiently, it will not be able to provide the necessary cooling air flow to the condenser. This will likewise lead to a decrease in the cooling performance of the condenser and increase the refrigerant pressure.
Excessive system refrigerant charge: Excessive refrigerant can cause the liquid to take up too much space in the system, especially in the condenser and evaporator. This reduces the proportion of gaseous refrigerant and increases the burden on the compressor, ultimately leading to high pressures.
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