Vacuum pumps are component of among the final processes in the repair process. After you’ve diagnosed and repaired any leaks or other issues in the machine it’s time to recharge. Before recharging you wish to make sure the system is free from any undesired gasses, air, or drinking water. If we were holding to stay in the machine, it would turn the oil it operates on into sludge and keep behind damaging impurities.
The draw on a vacuum pump is usually divided into its 
“CFM,” or Cubic Feet per Minute. To estimate what your CFM requirements, look at the tonnage of the systems you focus on. Take the Ac Vacuum Pump square root of that quantity and you’ll obtain the approximate CFM you must have to work with that system. Typical home systems need 4-5 CFM, while commercial and rooftop systems generally require as much as 6-8 CFM.