1) Due to insufficient refrigerant, both the suction pressure and discharge pressure of the compressor is lower than normal.

2) With Insufficient refrigerant, the evaporation capacity in the evaporator decreases, so the cooling capacity decreases and the cooling effect is not good. The room temperature or storage temperature drops slowly or does not drop.

3) The thermal expansion valve does not frost or rarely frosts. In air-conditioning conditions, no condensation, and little or no condensed water.

4) There is little or no frosting on the evaporator. In the condition of air conditioning, there is no condensation, and there is little or no condensed water.

5) Due to insufficient refrigerant, the compressor often does not operate under the rated load, causing the unit to be lightly loaded or even idling, and the current is lower than the rated current at this time.

The causes of refrigerant flooding may be as follows:

1) The newly installed system is not filled with refrigerant as required.

2) The airtightness of the system is not good, and the refrigerant leaks.

3) Improper operation and maintenance, causing refrigerant leakage, etc.

When it is found that the refrigerant in the system is insufficient, the entire system should be checked strictly to eliminate the fault, and the refrigerant should be replenished according to regulations to restore normal operation.

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