Vacuum pumps are part of among the final procedures in the repair procedure. After you’ve diagnosed and repaired any leaks or other issues in the system it is time to recharge. Before recharging 
you really want to make sure the machine is free of any unwanted gasses, air, or water. If we were holding to remain in the system, it could turn the oil it runs on into sludge and keep behind damaging impurities.
The draw on a vacuum pump is usually divided into its “CFM,” or Cubic Feet each and every minute. To estimate what your CFM Ac Vacuum Pump china requirements, consider the tonnage of the systems you work on. Take the square root of that quantity and you’ll get the approximate CFM you need to have to work with that system. Typical home systems need 4-5 CFM, while industrial and rooftop systems generally require just as much as 6-8 CFM.