Question about Heating & Cooling
Yes it is absolutely necessary to evacuate the system. But before evacuation of the system, a pressure test should be performed with compressed nitrogen to check and verify that there are no leaks within the system.
The only way to properly evacuate a system is with a vacuum pump. Most professionals prefer a dual stage pump that can evacuate quickly and then kicks into a lower gear to complete the process.
A triple evacuation is the best method, whereas the system is pulled down to 500 microns, and then the vacuum is broke with dry nitrogen. This process is repeated 3 times to complete evacuation. Once the system has been pulled below 500 microns for the third time, the system should be left in a vacuum for at least 5 minutes and verify there is no more leaks or moisture in the system. If after 5 minutes, your micron reading has not elevated, then your good to go. If it has, then you need to continue working.
The reason the system needs to be evacuated is to remove all the moisture from the system. Moisture and refrigerant do not mix and elevated moisture levels within a refrigeration system can cause severe damage to all the components including the compressor, expansion valves, filter driers, reversing valves, service valves, etc.etc... These damages could also void the warranty due to improper installation and start-up practices and procedures.
Posted on Jun 03, 2010
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Posted on Jun 03, 2010
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Posted on Jan 02, 2017
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