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Whether you are installing a new air conditioning or refrigeration unit or changing the expansion valve, you need to carry out the evacuation or vacuuming process. This is done to ensure that there is no air or moisture left behind the piping system. To ensure the ease of carrying out the evacuation process, making use of a vacuum pump is recommended as the ideal solution.

If air or moisture remains back in the refrigeration or air conditioning unit, it could affect the overall performance of the compressor. In addition to this, it could also reduce the overall cooling capacity of the cooling unit and could clog the cycle of proper refrigeration or cooling which could lead to a malfunction.

The evacuation process with the help of a vacuum pump is vital to make sure that the air conditioner or the refrigeration system is running properly. If you wish to ensure the best for your refrigeration & air conditioning unit, you must know the procedure to correctly evacuate the same with the help of a vacuum pump.

Before knowing about the procedure, here are some important points for you to consider:

  • Non-condensable gases do not tend to condense in the cooling system’s condenser. As such, these gases will use up the available space in the given condenser. Upon a new installation, the air conditioning system is usually soldered at some places. After the installation is done, there remains some amount of coil air in the evaporator and the piping system. Air contains oxygen & nitrogen –both are non-condensable gases. If these non-condensable gases are not evacuated from the system, the gases will take up space in the evaporator coil.

The presence of such non-condensable gases will lead to an increase in the overall operating temperatures which will make the compressor of the unit to work harder. As such, a proper evacuation of the cooling unit with the help of a vacuum pump will ensure the elimination of such gases towards ensuring the normal functioning of the cooling units.

  • The presence of moisture too can be highly detrimental to the major components of the refrigeration & air conditioning unit. Moisture present in an air conditioning or refrigeration unit will mix with the available oil in the system. This mixture of the oil with moisture causes the generation of acid sludge which tend to eventually kill the compressor. If the evacuation process is not carried out properly in the air conditioning or refrigeration units, it could lead to the overall failure of the system.
  • When moisture is present in the refrigeration circuit of the air conditioning or refrigeration system, it could also lead to problems with the refrigeration controls, particularly at the metering device. The moisture here tends to freeze inside the available controls. As a result, the restriction is caused which leads to the malfunctioning of the refrigeration unit. As a result, little or no cooling is achieved. As such, it becomes vital to evacuate moisture from the refrigeration unit after installation.

Evacuation the Refrigeration Or Air Conditioning Unit with a Vacuum Pump

Here are the steps to follow to evacuate the air conditioning or refrigeration unit by making use of a vacuum pump:

  • Make sure that the cooling unit has been switched off before starting the evacuation process. Make the connection of the manifold gauge to the cooling system. The blue hose (low-pressure hose) should be connected to the service port 3-way valve. Similarly, the yellow hose (service hose) should be connected to the vacuum pump.
  • Switch on the vacuum pump. Open the valve towards the low side of the manifold gauge. You can observe the needle on the pressure gauge moving from 0 psi to -14.5 psi. This pressure fall continues for around 10-20 minutes.
  • After this, you should close the lower side of the manifold gauge’s valve. Before this, you should firstly switch off the vacuum pump. Now, the system comes under the effect of the vacuum pressure.
  • You should ensure that the needle of the low-pressure gauge is not moving for around 10 minutes. This is the process to check or prevent the refrigeration system from leaking.
  • After you have completed the leakage task, you are required to disconnect the hoses of the manifold gauge from the vacuum pump.
  • Now, refill or charge the air conditioning or the refrigeration system with the refrigerant or coolant. This should be continued until the needle reaches the value 43 psi. The primary motive here is to fill up the refrigeration or cooling system with around 50 percent of the refrigerant before you are able to charge the same to its full capacity.

Follow these steps to evacuate the refrigeration or air conditioning system effectively. To expect the best results, avail high-end cooling services from https://www.coit.com/reno. Lonnie Fixel -CEO of Coil Cleaning & Restoration (based in Reno, Nevada) emphasizes the importance of maintaining the cooling system to ensure its proper functioning.