📖 GLOSSARY · MEASUREMENT
What is a micron?
The unit used to measure how deep a vacuum is when evacuating a sealed system before charging.
Before refrigerant goes in, the system must be evacuated to remove air and boil off any moisture — typically below 500 microns, verified with a micron gauge and a standing test to prove the vacuum holds. Skipping or rushing this step leaves non-condensables and water in the system, which raises pressures and forms acids. A deep, verified vacuum is a large part of what separates a sealed-system repair that lasts from one that fails within a year.
Where you’ll meet it
Repairs that involve micron
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