Vacuum pumps are part of one of the final procedures in the repair process. After you’ve diagnosed and repaired any leaks or additional issues in the machine it is time to recharge. Before recharging you really want to make sure the system is free from any undesirable gasses, air, or water. If these were to stay in the system, it would turn the oil it runs on into sludge and keep behind damaging impurities.
The draw on vacuum pressure pump is usually divided into its “CFM,” or Cubic Feet each and every minute. To estimate what your CFM needs, look at the tonnage of the systems you focus on. Take the sq . root of that quantity and you’ll obtain the approximate CFM you must have to Ac Vacuum Pump 
utilize that system. Typical home systems need 4-5 CFM, while commercial and rooftop systems generally require as much as 6-8 CFM.