B P Refcool Refrigeration system vacuuming


As a service engineer of refrigeration and air conditioning systems, you know that proper maintenance and repair of these systems are crucial to ensure efficient and reliable operation. You may have heard or come across the term "vacuuming" or "evacuation" of the refrigeration system before refrigerant charging. But why is it so important? In this blog post, we will discuss the reasons why vacuuming the refrigeration system is a critical step in the refrigerant charging process, and why you should never skip it.

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Removing Moisture and Non-condensable Gases

When a refrigeration system is first installed or serviced, air and moisture can enter the system. Moisture can cause freezing of the evaporator, reduce lubrication, and cause corrosion. Air and other non-condensable gases can occupy the space inside the system, which can reduce the cooling capacity and cause high head pressures, leading to compressor damage. Vacuuming the system can remove all the air and moisture, leaving the system free of contamination and ready for proper refrigerant charging.


Detecting Leaks

Vacuuming the refrigeration system can help you detect leaks in the system. When the system is under vacuum, any leaks will be quickly identified as the vacuum will not hold. This allows you to repair leaks before charging the refrigerant, preventing refrigerant loss, and further damage to the system.


Ensuring Proper Refrigerant Charge

Removing all air and moisture from the system ensures that you get a proper refrigerant charge. Air in the system can displace refrigerant, reducing the amount of refrigerant that can be charged. Moisture in the system can cause an incorrect reading of the refrigerant scale, resulting in undercharging or overcharging the system.


Improving System Efficiency

By vacuuming the refrigeration system before refrigerant charging, you are improving its efficiency. A system with air and moisture will have a lower cooling capacity, and the compressor will have to work harder to maintain the desired temperature. A system with proper refrigerant charge and no contaminants will run more efficiently and require less energy to operate, leading to energy savings and longer equipment life.




Vacuuming the refrigeration system before refrigerant charging is crucial in ensuring proper system performance, safe operation, and efficient energy usage. Skipping this step can lead to inefficient cooling, damage to the system, and safety hazards. As a service engineer, it is your responsibility to follow the proper maintenance and repair procedures, including vacuuming the refrigeration system, to ensure the best results for your customers.

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