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How to exhaust the air entering the lab water chiller?

ClassificationIndustry News 86

How to exhaust the air entering the lab water chiller?

1. It is necessary to extract the residual gas inside the laboratory water chiller system, remove the moisture and non-condensable gas inside, and keep it dry.

2. Carry out leak detection and inspection on the LC -25°C ~ -5°C Low Temperature Chillers. If the system fails to reach the required vacuum level during the vacuum pumping process, it indicates that there is a leak in the system.


Before charging refrigerant, the entire system must be vacuumed to ensure that the vacuum degree in the system is not less than 133 Pa.

Before starting the vacuum pump, carefully check whether all connections and welding junctions are in good condition, and whether the rubber plug at the pump exhaust port is open.

5. When stopping vacuum pumping, first close the switch of the through valve to separate the laboratory water chiller from the vacuum pump.

Before using a vacuum pump, be sure to observe whether the lubricating oil is sufficient.


Use the refrigerant recovery system of the laboratory chiller to recover the refrigerant. By activating the refrigerant recovery system of the laboratory water chiller, most of the refrigerant in the equipment is recovered into the tank, and then the remaining small portion of the refrigerant and air are discharged. Then, the equipment is thoroughly vacuumed, and a sufficient amount of refrigerant is injected.

Exhaust the air from the system by operating the laboratory chiller compressor and condenser. The steps can be summarized as follows: first close the condenser outlet valve, then start the compressor to compress the refrigerant into the condenser;

When the low pressure of the refrigeration system is stable, the compressor stops working and closes the suction valve, while the exhaust valve remains open. At the same time, open the cooling water shutoff valve to fully liquefy the high-pressure refrigerant;


After cooling for a certain period of time, loosen the compressor exhaust valve to discharge the air. When the hand feels cool or hot, it indicates that the exhaust is air rather than refrigerant. At normal temperature, close the compressor exhaust valve to complete the air discharge operation of the chiller refrigeration system.

Discharge the refrigerant and air in the cooling system of the water chiller into the tank, and submit the refrigerant containing air to the refrigerant manufacturer for treatment; After all the gases are extracted, the equipment is vacuumed and then filled with refrigerant. This method is wasteful and not recommended in non emergency situations.

The presence of air in the chiller refrigeration system has a significant impact on the entire refrigeration system, such as reduced cooling capacity of equipment, increased power consumption, abnormal compressor operation, and so on.

However, due to the cumbersome methods for removing air from the refrigeration system, which require professional personnel to conduct, and the direct discharge of refrigerant is very dangerous. Therefore, it is not recommended to operate it by yourself, and you should promptly contact the manufacturer of the water chiller.

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