Vacuum pumps are part of one of the final processes in the repair process. After you’ve diagnosed and repaired any leaks or other issues in the system it is 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 remain in the system, it could turn the essential oil it operates on into sludge and leave behind damaging impurities.
The draw on vacuum pressure pump is usually divided into its “CFM,” or Cubic Feet each and every minute. To Ac Vacuum Pump china estimate what your CFM needs, consider the tonnage of the systems you focus on. Take the square root of that amount and you’ll get the approximate CFM you 
need to have to work with that system. Typical residential systems need 4-5 CFM, while commercial and rooftop systems generally need as much as 6-8 CFM.