[Experience] What happens if the compressor suction pressure is too high and the discharge pressure is too high

[Experience] What happens if the compressor suction pressure is too high and the discharge pressure is too high Compressor suction pressure is too high, discharge pressure is too high 1. Too much refrigerant. Too much refrigerant will cause the suction pressure and discharge pressure to be too high at the same time. This is because when too much refrigerant fills the reservoir, it will occupy a part of the condenser volume, reducing the heat dissipation area and causing the condenser Poor condensation. Discharge excess refrigerant from the low-pressure side. 2. The opening of the expansion valve is too large, which reduces the throttling effect, the refrigerant cannot fully vaporize and absorb heat, causing the low-pressure pressure to rise, and liquid refrigerant flows back to the compressor, causing liquid shock. The adjusting nut of the expansion valve can be tightened by half a turn to two turns to adjust the low-pressure pressure to the normal range. 3. The suction valve of the compressor is broken, so that the compressor cannot suck the refrigerant gas in the evaporator, which will cause the low pressure to be too high. At this time, the compressor must be replaced. 4. The inlet air temperature of the evaporator is too high. When the ambient temperature is high, the return air temperature of the evaporator will also be high, so that the low pressure will also increase. At this time, the fresh air mechanism may be broken, and the fresh air door cannot be closed when it is opened. 5. Air is mixed in the system. Since the air is non-condensable gas, the air in the refrigeration pipeline will increase the system pressure. The treatment method is to completely release the refrigerant, re-evacuate, leak check, and add new refrigerant. 6. Expansion valve temperature-sensing package is not well-insulated or poorly bandaged, which will cause the expansion valve to open too much and make the low-pressure pressure higher. The temperature should be wrapped up again. 7. The condenser fan does not run, and the condenser fan should be repaired or replaced. 8. The air volume of the condenser fan is insufficient. It should be checked whether the fan circuit is in poor contact, whether the fan is blocked by foreign objects, and whether the condenser fins have too much dust, and the cause of the fault is found and eliminated. Compressor suction pressure is too high, discharge pressure is normal 1. The inlet air temperature of the evaporator is too high. When the ambient temperature is high, the return air temperature of the evaporator will also be high, so that the low pressure will also increase. At this time, the fresh air mechanism may be broken, and the fresh air door cannot be closed when it is opened. 2. If the opening of the expansion valve is too large, the opening of the expansion valve should be reduced. 3. The suction valve of the compressor is damaged. Replace the suction valve. 4. The expansion valve's temperature sensor is loose or poorly insulated, so it should be tightened to ensure good contact and strengthen the insulation protection.

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