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What You Need To Know About The Process Of Evacuation (Can Refrigerant Be Evacuated?)

How To Inspect And Recharge A Mini Split Refrigerant

One of the crucial tasks HVAC specialists complete while repairing and installing an equipment is pulling a vacuum. If you’re curious about whether the vacuum pump removes the refrigerant, we have the answer so keep on reading!

The refrigerant circuit is involved in the evacuation process. The vacuum pump removes everything during the suction except for the refrigerant. By using this technique, it is ensured that the refrigerant circuit is clear of contaminants like nitrogen, air, and moisture, which might obstruct refrigerant flow or result in system failure.

What Is The Process Of Evacuation?

What You Need To Know About The Process Of Evacuation (Can Refrigerant Be Evacuated?)

Many cooling, heating, and refrigeration systems depend on the refrigerant as a key part. The refrigerant will struggle to do its work when there are components other than the refrigerant itself in the circuit.

Because your refrigerant can have issues with moisture, nitrogen, or air, the evacuation process must be carried out during installation and repair.

After the appliance is put together, it is impossible for there to be no non-condensable in the system.

For this reason, you must carry out an evacuation procedure both after installation and each time you repair a system. There are two steps in this process.

The Stage of Degassing

This is the easy phase in the whole evacuation process. Simply sucking out all of the air and vapors from the refrigerant system is what is done during the degassing stage.

Since the presence of non-condensible increases head pressure, its removal is crucial. The system’s operating costs will drop when the non-condensible is removed, allowing the refrigerant to function more effectively.

The Stage Of Dehydration

The stage of dehydration is really difficult. You must ensure that the vacuum is strong enough and the system is properly sealed in order to complete the second step of evacuation.

This is due to the fact that the vacuum pump must lower the pressure during the dehydration stage in order for the system’s moisture to evaporate. Your equipment is vulnerable to early failure if moisture is not removed from the refrigerant system.

The Best Way To Remove The Refrigerant

What You Need To Know About The Process Of Evacuation (Can Refrigerant Be Evacuated?)

Your HVAC professional will typically carry out the evacuation procedure after installing your cooling, heating, or refrigeration equipment and during system repairs.

Here is a straightforward instruction that you can use if you want to execute it on your own, but before you do, think about your safety and remember to use PPE like gloves, a mask, goggles, and other accessories.

What you’ll require is:

  • Vase pump
  • Oil for vacuum pumps
  • screwdrivers
  • 3/8″ hose
  • gauge manifold for microns

The Process Of Evacuation

To avoid making mistakes that could result in system failures, make sure you have read your appliance’s user manual in its entirety before we start.

We can start the evacuation process once you have all you require and have prepared yourself with the necessary knowledge. The steps are listed below.

Getting The Gears Ready

Your vacuum pump should now contain pump oil. We advise using warm, fresh oil so that it may pick up more moisture and impurities in the system.

Attach the vacuum core tools to the service fittings on your system and remove the valve cores.

Never use a charging manifold; only a vacuum manifold Connect it to the 3/8″ port on your vacuum pump.

Assembly Of The Equipment

Your vacuum manifold should be attached to the other end of each vacuum hose. You can use any gasket sealants and threads at the connecting points to stop any leaks from occurring while the procedure is being done. All of your core removal machinery should be equipped with 3/8″ hoses.

Connect your micron gauge either onto the system or to the tee of your core removal tool. Take note that you must set the micron gauge higher than the system piping to prevent factory oil from reaching it. The gauge needs to be placed close to the system for readings to be accurate.

Follow Evacuation Protocols

Start the evacuation process, and keep going until you achieve a level of 500 microns or less.

Never neglect to look for any indications of a potential leak. When the micron gauge rises very little or not at all, the system is leak-free and free of any lingering impurities.

Adding More Refrigerant

Fill the system with the refrigerant. Please be aware that if you are not a certified professional, adding or replacing the refrigerant is not advised. When inhaled deeply, refrigerants are dangerous and may even be fatal.

What Leads To The Failure Of An Evacuation Process?

When the evacuation procedure leaves certain impurities behind that could endanger the refrigerant system, it can be frustrating.

Here are some obstacles to watch out for before starting your evacuation procedure over again if you suspect a failure.


The slightest leaks can stop the process in its tracks. Check the couplings, manifolds, fittings, and hoses to see if any of these components are not correctly sealed.

Vacuum Limitations

Check the length of the hose you’re using, the valve cores, the vacuum manifolds, the hose core depressors, and even the size of the hose to make sure nothing can stop the vacuum from working to its full potential. These components may limit your vacuum and slow down the operation.

Incorrect Positioning Of The Micron Gauge

Make that the micron gauge is positioned higher than the system pipes and that it is securely linked to the system or the tee of your core removal equipment.


It is suggested that you perform the evacuation operation using fresh hoses. If it has been used with your refrigerant, older ones may already have been polluted, rendering them susceptible to moisture and other impurities.

Use Of A Defective Pump

The vacuum pump itself may be the source of the issue. If the pump cannot pull below 50 microns after being disconnected from the system, it must be replaced.

Refrigerant: Gas Or Not? Why Is It Significant?

What You Need To Know About The Process Of Evacuation (Can Refrigerant Be Evacuated?)

A refrigerant is a chemical substance that is used in equipment like air conditioners, freezers, and heat pumps. It can be a liquid or a low-pressure gas.

Once it has been pressured and compressed by the system’s compressor, it can absorb heat and move it from one location to another. In plainer terms, the refrigerant is what allows your air conditioner to effectively chill a space.

The appliance won’t be able to absorb heat if there is no refrigerant in the system. Due to the shortage of refrigerant, the compressor is also more susceptible to failure. However, problems might also result from the system having too much refrigerant.

Would You Be Able To Refill The Refrigerant On Your Own?

The US Environmental Protection Agency does not advise filling your system’s refrigerant manually, even if you have a recharge kit at home. Both the environment and your health could be harmed by doing this.

Even though refrigerants are necessary parts of any cooling and heating system, there are drawbacks to everything.

Refrigerants pose a bodily risk to anyone who breathes them in and are poisonous and combustible. In fact, excessive refrigerant inhalation can be lethal because it can prevent oxygen from reaching the cells’ lungs and tissues.

The best course of action is to contact your HVAC professional. It is advised that only qualified experts replace the refrigerant in your device.

These professionals are knowledgeable about how to handle refrigerants safely and without harming the environment or themselves.

However, if the refrigerant leak is already present, you can already be experiencing bodily symptoms like throat and lung discomfort, nausea, headaches, and skin rashes.

If the leak continues, these medical problems could worsen, so if you think there might be a refrigerant leak, don’t wait to call the experts.

Despite the fact that it is not malignant and has not been shown to have long-term consequences on those who have inhaled it, you should still consult a doctor to avoid things getting worse.


The evacuation procedure is necessary to keep our appliances in working order for a long time. Keep in mind that it’s a two-stage procedure carried out once the item is installed and after any necessary maintenance repairs.

Do not hesitate to call your HVAC professional if you need to refill the refrigerant. You should always put your health and safety first, and refrigerants are something you do not want to take lightly.

What You Need To Know About The Process Of Evacuation (Can Refrigerant Be Evacuated?)

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Written by HVAC Contributor

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