1. Check whether the refrigerating oil of the original compressor is too dirty. If the oil is too dirty, the system must be cleaned with nitrogen and the dry filter must be replaced.

2. Check whether the contacts of the compressor operation control AC contactor are stuck or have poor contact, causing the compressor to run out of phase. If the compressor is damaged in the coil winding, the AC contactor of the same model must be replaced.

3. Check and protect the circuit. The high and low pressure switch is in the closed state in the normal refrigerant compression state, the high pressure limit is less than or equal to 2.2Mpa, and the low pressure is more than or equal to 0.28Mpa.

4. Check whether the radiator is too dirty and must be cleaned.

5. Check whether the original equipment has refrigerant pressure, and repair it if the refrigerant is leaking.

1. Disconnect the power supply.

2. Disassemble the compressor and check its old compressor.

3. Nitrogen cleaning system, steps, disassemble the filter and blow in nitrogen from the inlet of the radiator, discharge from the outlet of the radiator, then blow in from the inlet of the filter, release from the return pipe of the compressor, and repeat cleaning several times.

4. Install the new compressor and weld the new filter.

5. Use nitrogen to pressure, 2.0Mpa pressure for leak detection for 30 minutes.

6. Circuit check and replace damaged parts, check power supply and control circuit.

7. Clean the radiator.

8. Vent the nitrogen and evacuate for 30 minutes.

9. Add the same type of refrigerant

10. Power-on debugging, check the compressor current and voltage, the normal pressure of the refrigerant, high pressure 1.7Mpa, low pressure 0.45Mpa, the refrigerant charge is expected to be 0.7kg/hp (10-30hp).