Why screw compressor suction pressure is too high or too low?

High suction pressure of screw compressor

Causes:

1. Heat load is too large

2. The expansion valve opening is too large

3. Loose temperature-sensitive package of expansion valve

4. The system has non-condensing gas

Solution:

1. Reduce the load or increase the refrigeration equipment

2. Adjust the opening degree of the expansion valve

3. Place the temperature-sensitive package, wrap tightly

4. Discharge non-condensing gas

Low suction pressure of screw compressor

Causes:

1. Insufficient refrigerant

2. The liquid line or filter drier is blocked

3. The evaporator water temperature is too low

4. The compressor inlet valve is not open enough

5. Ice blockage of expansion valve or temperature-sensing package failure

6. The expansion valve is too small

7. The evaporator heat transfer tube is seriously scaled

Solution:

1. Insufficient refrigerant

2. The liquid pipeline or filter drier is blocked

3. The evaporator water temperature is too low

4. The compressor inlet valve is not open enough

5. Ice blockage of expansion valve or temperature-sensitive package failure

6. The expansion valve is too small

7. The evaporator heat transfer tube is seriously scaled