1. After the compressor is started, it should run smoothly without noise, and the protection and control components should be able to work normally.
2. The cooling water and refrigerant water should be sufficient, the water pressure should not be less than 0.12MPa, the water flow should meet the design requirements, and the cooling water temperature should generally be around 32℃.
3. The outlet pressure of the oil pump should be 1.5~3kg/C㎡ higher than the suction pressure, the oil temperature should not be lower than 70℃ and the oil should not cause much foam, and the oil level should not be lower than 1/3 of the oil mirror.
4. The suction temperature is 5~15℃ higher than the evaporating temperature. The suction temperature should not exceed 15℃ during normal operation. For the air conditioning system, the evaporating temperature is about 5℃ lower than the temperature of the cooled medium. For the condensing unit,he temperature should be about 10~15℃ lower than the temperature of the cooling medium.

5. The exhaust temperature should not exceed 115℃. (R22). When the compressor is in normal operation, the condensing pressure does not exceed 1.4MPa (for water-cooled units), and for Cold room air cooled condensers, the condensing pressure does not exceed 2Mpa.

6. For a system equipped with an automatic oil return device, the automatic oil return pipe should be cold and hot from time to time, and there should be no significant temperature difference between the front and rear of the liquid pipe filter. For systems with accumulators, the refrigerant level is not lower than 1/3 of this level indicator.
7. There should be no local heating and frosting on the cylinder wall. For freezer cooler evaporators, there should be no frosting on the suction pipe. For refrigerated products, it is normal for the suction pipe to freeze to the suction valve port.

8. During operation, the horizontal condenser should be hot on the top and cool on the bottom. The interface between the cold and heat is the interface of the refrigerant. The upper and lower parts of the oil separator are not too hot, and the interface between the cold and heat is the interface of the oil.
9. The valve body of the expansion valve should be evenly frosted and dew condensation (no frost should be formed in the air-conditioning system), but no thick frost can be found at the outlet, and only a dull little sound can be heard when the liquid flows through the expansion valve.
10. Under the condition of certain water pressure and water volume, there should be a significant temperature difference between the inlet and outlet water, and the general temperature difference is 3~5℃
11. There should be no leakage or oil seepage in the system, the pointer of each pressure gauge should be relatively stable, the compressor current should not be greater than the rated current, and the insulation resistance should not be less than 5MΩ.