Gary McCreadie is an HVAC tech, the creator of hvacknowitall.com and the HVAC Know It All Podcast The science on how we pull an evacuation on air conditioning and refrigeration systems has changed over the years.  Back in the day, technicians would purge refrigerant through the system to remove air, moisture…

Pulling a proper vacuum is vital to the operation and longevity of any refrigeration or cooling system.  Moisture and other contaminants that are not removed can wreak havoc on system internals over time and can cause premature failures.  Lets go through the steps of pulling a proper vacuum.   1.    Start…